Question: What is Node Status?

Answer: Node StatusThe status of a node in Kubernetes is a critical aspect of managing a Kubernetes cluster. In this article, we'll cover the basics of monitoring and maintaining node status to ensure a healthy and stable cluster.Node status fieldsA Node's status contains the following information:AddressesConditionsCapacity and AllocatableInfoYou can use kubectl to view a Node's status and other details:kubectl describe node <insert-node-name-here> Each section of the output is described below.AddressesThe usage of these fields varies depending on your cloud provider or bare metal configuration.HostName: The hostname as reported by the node's kernel. Can be overridden via the kubelet --hostname-override parameter.ExternalIP: Typically the IP address of the node that is externally routable (available from outside the cluster).InternalIP: Typically the IP address of the node that is routable only within the cluster.ConditionsThe conditions field describes the status of all Running nodes. Examples of conditions include:Node conditions, and a description of when each condition applies.Node ConditionDescriptionReadyTrue if the node is healthy and ready to accept pods, False if the node is not healthy and is not accepting pods, and Unknown if the node controller has not heard from the node in the last node-monitor-grace-period (default is 50 seconds)DiskPressureTrue if pressure exists on the disk size—that is, if the disk capacity is low; otherwise FalseMemoryPressureTrue if pressure exists on the node memory—that is, if the node memory is low; otherwise FalsePIDPressureTrue if pressure exists on the processes—that is, if there are too many processes on the node; otherwise FalseNetworkUnavailableTrue if the network for the node is not correctly configured, otherwise FalseNote:If you use command-line tools to print details of a cordoned Node, the Condition includes SchedulingDisabled. SchedulingDisabled is not a Condition in the Kubernetes API; instead, cordoned nodes are marked Unschedulable in their spec.In the Kubernetes API, a node's condition is represented as part of the .status of the Node resource. For example, the following JSON structure describes a healthy node:"conditions": [ { "type": "Ready", "status": "True", "reason": "KubeletReady", "message": "kubelet is posting ready status", "lastHeartbeatTime": "2019-06-05T18:38:35Z", "lastTransitionTime": "2019-06-05T11:41:27Z" } ] When problems occur on nodes, the Kubernetes control plane automatically creates taints that match the conditions affecting the node. An example of this is when the status of the Ready condition remains Unknown or False for longer than the kube-controller-manager's NodeMonitorGracePeriod, which defaults to 50 seconds. This will cause either an node.kubernetes.io/unreachable taint, for an Unknown status, or a node.kubernetes.io/not-ready taint, for a False status, to be added to the Node.These taints affect pending pods as the scheduler takes the Node's taints into consideration


Question: How does Node Status work?

Answer: Node StatusThe status of a node in Kubernetes is a critical aspect of managing a Kubernetes cluster. In this article, we'll cover the basics of monitoring and maintaining node status to ensure a healthy and stable cluster.Node status fieldsA Node's status contains the following information:AddressesConditionsCapacity and AllocatableInfoYou can use kubectl to view a Node's status and other details:kubectl describe node <insert-node-name-here> Each section of the output is described below.AddressesThe usage of these fields varies depending on your cloud provider or bare metal configuration.HostName: The hostname as reported by the node's kernel. Can be overridden via the kubelet --hostname-override parameter.ExternalIP: Typically the IP address of the node that is externally routable (available from outside the cluster).InternalIP: Typically the IP address of the node that is routable only within the cluster.ConditionsThe conditions field describes the status of all Running nodes. Examples of conditions include:Node conditions, and a description of when each condition applies.Node ConditionDescriptionReadyTrue if the node is healthy and ready to accept pods, False if the node is not healthy and is not accepting pods, and Unknown if the node controller has not heard from the node in the last node-monitor-grace-period (default is 50 seconds)DiskPressureTrue if pressure exists on the disk size—that is, if the disk capacity is low; otherwise FalseMemoryPressureTrue if pressure exists on the node memory—that is, if the node memory is low; otherwise FalsePIDPressureTrue if pressure exists on the processes—that is, if there are too many processes on the node; otherwise FalseNetworkUnavailableTrue if the network for the node is not correctly configured, otherwise FalseNote:If you use command-line tools to print details of a cordoned Node, the Condition includes SchedulingDisabled. SchedulingDisabled is not a Condition in the Kubernetes API; instead, cordoned nodes are marked Unschedulable in their spec.In the Kubernetes API, a node's condition is represented as part of the .status of the Node resource. For example, the following JSON structure describes a healthy node:"conditions": [ { "type": "Ready", "status": "True", "reason": "KubeletReady", "message": "kubelet is posting ready status", "lastHeartbeatTime": "2019-06-05T18:38:35Z", "lastTransitionTime": "2019-06-05T11:41:27Z" } ] When problems occur on nodes, the Kubernetes control plane automatically creates taints that match the conditions affecting the node. An example of this is when the status of the Ready condition remains Unknown or False for longer than the kube-controller-manager's NodeMonitorGracePeriod, which defaults to 50 seconds. This will cause either an node.kubernetes.io/unreachable taint, for an Unknown status, or a node.kubernetes.io/not-ready taint, for a False status, to be added to the Node.These taints affect pending pods as the scheduler takes the Node's taints into consideration


Question: When would you use Node Status?

Answer: Node StatusThe status of a node in Kubernetes is a critical aspect of managing a Kubernetes cluster. In this article, we'll cover the basics of monitoring and maintaining node status to ensure a healthy and stable cluster.Node status fieldsA Node's status contains the following information:AddressesConditionsCapacity and AllocatableInfoYou can use kubectl to view a Node's status and other details:kubectl describe node <insert-node-name-here> Each section of the output is described below.AddressesThe usage of these fields varies depending on your cloud provider or bare metal configuration.HostName: The hostname as reported by the node's kernel. Can be overridden via the kubelet --hostname-override parameter.ExternalIP: Typically the IP address of the node that is externally routable (available from outside the cluster).InternalIP: Typically the IP address of the node that is routable only within the cluster.ConditionsThe conditions field describes the status of all Running nodes. Examples of conditions include:Node conditions, and a description of when each condition applies.Node ConditionDescriptionReadyTrue if the node is healthy and ready to accept pods, False if the node is not healthy and is not accepting pods, and Unknown if the node controller has not heard from the node in the last node-monitor-grace-period (default is 50 seconds)DiskPressureTrue if pressure exists on the disk size—that is, if the disk capacity is low; otherwise FalseMemoryPressureTrue if pressure exists on the node memory—that is, if the node memory is low; otherwise FalsePIDPressureTrue if pressure exists on the processes—that is, if there are too many processes on the node; otherwise FalseNetworkUnavailableTrue if the network for the node is not correctly configured, otherwise FalseNote:If you use command-line tools to print details of a cordoned Node, the Condition includes SchedulingDisabled. SchedulingDisabled is not a Condition in the Kubernetes API; instead, cordoned nodes are marked Unschedulable in their spec.In the Kubernetes API, a node's condition is represented as part of the .status of the Node resource. For example, the following JSON structure describes a healthy node:"conditions": [ { "type": "Ready", "status": "True", "reason": "KubeletReady", "message": "kubelet is posting ready status", "lastHeartbeatTime": "2019-06-05T18:38:35Z", "lastTransitionTime": "2019-06-05T11:41:27Z" } ] When problems occur on nodes, the Kubernetes control plane automatically creates taints that match the conditions affecting the node. An example of this is when the status of the Ready condition remains Unknown or False for longer than the kube-controller-manager's NodeMonitorGracePeriod, which defaults to 50 seconds. This will cause either an node.kubernetes.io/unreachable taint, for an Unknown status, or a node.kubernetes.io/not-ready taint, for a False status, to be added to the Node.These taints affect pending pods as the scheduler takes the Node's taints into consideration


Question: What are the benefits of Node Status?

Answer: Node StatusThe status of a node in Kubernetes is a critical aspect of managing a Kubernetes cluster. In this article, we'll cover the basics of monitoring and maintaining node status to ensure a healthy and stable cluster.Node status fieldsA Node's status contains the following information:AddressesConditionsCapacity and AllocatableInfoYou can use kubectl to view a Node's status and other details:kubectl describe node <insert-node-name-here> Each section of the output is described below.AddressesThe usage of these fields varies depending on your cloud provider or bare metal configuration.HostName: The hostname as reported by the node's kernel. Can be overridden via the kubelet --hostname-override parameter.ExternalIP: Typically the IP address of the node that is externally routable (available from outside the cluster).InternalIP: Typically the IP address of the node that is routable only within the cluster.ConditionsThe conditions field describes the status of all Running nodes. Examples of conditions include:Node conditions, and a description of when each condition applies.Node ConditionDescriptionReadyTrue if the node is healthy and ready to accept pods, False if the node is not healthy and is not accepting pods, and Unknown if the node controller has not heard from the node in the last node-monitor-grace-period (default is 50 seconds)DiskPressureTrue if pressure exists on the disk size—that is, if the disk capacity is low; otherwise FalseMemoryPressureTrue if pressure exists on the node memory—that is, if the node memory is low; otherwise FalsePIDPressureTrue if pressure exists on the processes—that is, if there are too many processes on the node; otherwise FalseNetworkUnavailableTrue if the network for the node is not correctly configured, otherwise FalseNote:If you use command-line tools to print details of a cordoned Node, the Condition includes SchedulingDisabled. SchedulingDisabled is not a Condition in the Kubernetes API; instead, cordoned nodes are marked Unschedulable in their spec.In the Kubernetes API, a node's condition is represented as part of the .status of the Node resource. For example, the following JSON structure describes a healthy node:"conditions": [ { "type": "Ready", "status": "True", "reason": "KubeletReady", "message": "kubelet is posting ready status", "lastHeartbeatTime": "2019-06-05T18:38:35Z", "lastTransitionTime": "2019-06-05T11:41:27Z" } ] When problems occur on nodes, the Kubernetes control plane automatically creates taints that match the conditions affecting the node. An example of this is when the status of the Ready condition remains Unknown or False for longer than the kube-controller-manager's NodeMonitorGracePeriod, which defaults to 50 seconds. This will cause either an node.kubernetes.io/unreachable taint, for an Unknown status, or a node.kubernetes.io/not-ready taint, for a False status, to be added to the Node.These taints affect pending pods as the scheduler takes the Node's taints into consideration


Question: What is Node Status?

Answer: T h e   s t a t u s   o f   a   n o d e   i n   K u b e r n e t e s   i s   a   c r i t i c a l   a s p e c t   o f   m a n a g i n g   a   K u b e r n e t e s   c l u s t e r .   I n   t h i s   a r t i c l e ,   w e ' l l   c o v e r   t h e   b a s i c s   o f   m o n i t o r i n g   a n d   m a i n t a i n i n g   n o d e   s t a t u s   t o   e n s u r e   a   h e a l t h y   a n d   s t a b l e   c l u s t e r .


Question: What is Node status fields?

Answer: A   N o d e ' s   s t a t u s   c o n t a i n s   t h e   f o l l o w i n g   i n f o r m a t i o n :   A d d r e s s e s C o n d i t i o n s C a p a c i t y   a n d   A l l o c a t a b l e I n f o   Y o u   c a n   u s e   k u b e c t l   t o   v i e w   a   N o d e ' s   s t a t u s   a n d   o t h e r   d e t a i l s :   k u b e c t l   d e s c r i b e   n o d e   < i n s e r t - n o d e - n a m e - h e r e >   E a c h   s e c t i o n   o f   t h e   o u t p u t   i s   d e s c r i b e d   b e l o w .


Question: What is Addresses?

Answer: T h e   u s a g e   o f   t h e s e   f i e l d s   v a r i e s   d e p e n d i n g   o n   y o u r   c l o u d   p r o v i d e r   o r   b a r e   m e t a l   c o n f i g u r a t i o n .   H o s t N a m e :   T h e   h o s t n a m e   a s   r e p o r t e d   b y   t h e   n o d e ' s   k e r n e l .   C a n   b e   o v e r r i d d e n   v i a   t h e   k u b e l e t   - - h o s t n a m e - o v e r r i d e   p a r a m e t e r . E x t e r n a l I P :   T y p i c a l l y   t h e   I P   a d d r e s s   o f   t h e   n o d e   t h a t   i s   e x t e r n a l l y   r o u t a b l e   ( a v a i l a b l e   f r o m   o u t s i d e   t h e   c l u s t e r ) . I n t e r n a l I P :   T y p i c a l l y   t h e   I P   a d d r e s s   o f   t h e   n o d e   t h a t   i s   r o u t a b l e   o n l y   w i t h i n   t h e   c l u s t e r .


Question: What is Conditions?

Answer: T h e   c o n d i t i o n s   f i e l d   d e s c r i b e s   t h e   s t a t u s   o f   a l l   R u n n i n g   n o d e s .   E x a m p l e s   o f   c o n d i t i o n s   i n c l u d e :


Question: What is Note:?

Answer: I n   t h e   K u b e r n e t e s   A P I ,   a   n o d e ' s   c o n d i t i o n   i s   r e p r e s e n t e d   a s   p a r t   o f   t h e   . s t a t u s   o f   t h e   N o d e   r e s o u r c e .   F o r   e x a m p l e ,   t h e   f o l l o w i n g   J S O N   s t r u c t u r e   d e s c r i b e s   a   h e a l t h y   n o d e :   " c o n d i t i o n s " :   [   {   " t y p e " :   " R e a d y " ,   " s t a t u s " :   " T r u e " ,   " r e a s o n " :   " K u b e l e t R e a d y " ,   " m e s s a g e " :   " k u b e l e t   i s   p o s t i n g   r e a d y   s t a t u s " ,   " l a s t H e a r t b e a t T i m e " :   " 2 0 1 9 - 0 6 - 0 5 T 1 8 : 3 8 : 3 5 Z " ,   " l a s t T r a n s i t i o n T i m e " :   " 2 0 1 9 - 0 6 - 0 5 T 1 1 : 4 1 : 2 7 Z "   }   ]   W h e n   p r o b l e m s   o c c u r   o n   n o d e s ,   t h e   K u b e r n e t e s   c o n t r o l   p l a n e   a u t o m a t i c a l l y   c r e a t e s   t a i n t s   t h a t   m a t c h   t h e   c o n d i t i o n s   a f f e c t i n g   t h e   n o d e .   A n   e x a m p l e   o f   t h i s   i s   w h e n   t h e   s t a t u s   o f   t h e   R e a d y   c o n d i t i o n   r e m a i n s   U n k n o w n   o r   F a l s e   f o r   l o n g e r   t h a n   t h e   k u b e - c o n t r o l l e r - m a n a g e r ' s   N o d e M o n i t o r G r a c e P e r i o d ,   w h i c h   d e f a u l t s   t o   5 0   s e c o n d s .   T h i s   w i l l   c a u s e   e i t h e r   a n   n o d e . k u b e r n e t e s . i o / u n r e a c h a b l e   t a i n t ,   f o r   a n   U n k n o w n   s t a t u s ,   o r   a   n o d e . k u b e r n e t e s . i o / n o t - r e a d y   t a i n t ,   f o r   a   F a l s e   s t a t u s ,   t o   b e   a d d e d   t o   t h e   N o d e .   T h e s e   t a i n t s   a f f e c t   p e n d i n g   p o d s   a s   t h e   s c h e d u l e r   t a k e s   t h e   N o d e ' s   t a i n t s   i n t o   c o n s i d e r a t i o n   w h e n   a s s i g n i n g   a   p o d   t o   a


Question: What is Capacity and Allocatable?

Answer: D e s c r i b e s   t h e   r e s o u r c e s   a v a i l a b l e   o n   t h e   n o d e :   C P U ,   m e m o r y ,   a n d   t h e   m a x i m u m   n u m b e r   o f   p o d s   t h a t   c a n   b e   s c h e d u l e d   o n t o   t h e   n o d e .   T h e   f i e l d s   i n   t h e   c a p a c i t y   b l o c k   i n d i c a t e   t h e   t o t a l   a m o u n t   o f   r e s o u r c e s   t h a t   a   N o d e   h a s .   T h e   a l l o c a t a b l e   b l o c k   i n d i c a t e s   t h e   a m o u n t   o f   r e s o u r c e s   o n   a   N o d e   t h a t   i s   a v a i l a b l e   t o   b e   c o n s u m e d   b y   n o r m a l   P o d s .   Y o u   m a y   r e a d   m o r e   a b o u t   c a p a c i t y   a n d   a l l o c a t a b l e   r e s o u r c e s   w h i l e   l e a r n i n g   h o w   t o   r e s e r v e   c o m p u t e   r e s o u r c e s   o n   a   N o d e .


Question: What is Info?

Answer: D e s c r i b e s   g e n e r a l   i n f o r m a t i o n   a b o u t   t h e   n o d e ,   s u c h   a s   k e r n e l   v e r s i o n ,   K u b e r n e t e s   v e r s i o n   ( k u b e l e t   a n d   k u b e - p r o x y   v e r s i o n ) ,   c o n t a i n e r   r u n t i m e   d e t a i l s ,   a n d   w h i c h   o p e r a t i n g   s y s t e m   t h e   n o d e   u s e s .   T h e   k u b e l e t   g a t h e r s   t h i s   i n f o r m a t i o n   f r o m   t h e   n o d e   a n d   p u b l i s h e s   i t   i n t o   t h e   K u b e r n e t e s   A P I .


Question: What is Heartbeats?

Answer: H e a r t b e a t s ,   s e n t   b y   K u b e r n e t e s   n o d e s ,   h e l p   y o u r   c l u s t e r   d e t e r m i n e   t h e   a v a i l a b i l i t y   o f   e a c h   n o d e ,   a n d   t o   t a k e   a c t i o n   w h e n   f a i l u r e s   a r e   d e t e c t e d .   F o r   n o d e s   t h e r e   a r e   t w o   f o r m s   o f   h e a r t b e a t s :   u p d a t e s   t o   t h e   . s t a t u s   o f   a   N o d e L e a s e   o b j e c t s   w i t h i n   t h e   k u b e - n o d e - l e a s e   n a m e s p a c e .   E a c h   N o d e   h a s   a n   a s s o c i a t e d   L e a s e   o b j e c t .   C o m p a r e d   t o   u p d a t e s   t o   . s t a t u s   o f   a   N o d e ,   a   L e a s e   i s   a   l i g h t w e i g h t   r e s o u r c e .   U s i n g   L e a s e s   f o r   h e a r t b e a t s   r e d u c e s   t h e   p e r f o r m a n c e   i m p a c t   o f   t h e s e   u p d a t e s   f o r   l a r g e   c l u s t e r s .   T h e   k u b e l e t   i s   r e s p o n s i b l e   f o r   c r e a t i n g   a n d   u p d a t i n g   t h e   . s t a t u s   o f   N o d e s ,   a n d   f o r   u p d a t i n g   t h e i r   r e l a t e d   L e a s e s .   T h e   k u b e l e t   u p d a t e s   t h e   n o d e ' s   . s t a t u s   e i t h e r   w h e n   t h e r e   i s   c h a n g e   i n   s t a t u s   o r   i f   t h e r e   h a s   b e e n   n o   u p d a t e   f o r   a   c o n f i g u r e d   i n t e r v a l .   T h e   d e f a u l t   i n t e r v a l   f o r   . s t a t u s   u p d a t e s   t o   N o d e s   i s   5   m i n u t e s ,   w h i c h   i s   m u c h   l o n g e r   t h a n   t h e   4 0   s e c o n d   d e f a u l t   t i m e o u t   f o r   u n r e a c h a b l e   n o d e s . T h e   k u b e l e t   c r e a t e s   a n d   t h e n   u p d a t e s   i t s   L e a s e   o b j e c t   e v e r y   1 0   s e c o n d s   ( t h e   d e f a u l t   u p d a t e   i n t e r v a l ) .   L e a s e   u p d a t e s   o c c u r


Question: What is DeviceTaintRule v1alpha3?

Answer: DeviceTaintRule v1alpha3DeviceTaintRule adds one taint to all devices which match the selector.apiVersion: resource.k8s.io/v1alpha3import "k8s.io/api/resource/v1alpha3"DeviceTaintRuleDeviceTaintRule adds one taint to all devices which match the selector. This has the same effect as if the taint was specified directly in the ResourceSlice by the DRA driver.apiVersion: resource.k8s.io/v1alpha3kind: DeviceTaintRulemetadata (ObjectMeta)Standard object metadataspec (DeviceTaintRuleSpec), requiredSpec specifies the selector and one taint.Changing the spec automatically increments the metadata.generation number.DeviceTaintRuleSpecDeviceTaintRuleSpec specifies the selector and one taint.taint (DeviceTaint), requiredThe taint that gets applied to matching devices.The device this taint is attached to has the "effect" on any claim which does not tolerate the taint and, through the claim, to pods using the claim.taint.effect (string), requiredThe effect of the taint on claims that do not tolerate the taint and through such claims on the pods using them. Valid effects are NoSchedule and NoExecute. PreferNoSchedule as used for nodes is not valid here.taint.key (string), requiredThe taint key to be applied to a device. Must be a label name.taint.timeAdded (Time)TimeAdded represents the time at which the taint was added. Added automatically during create or update if not set.Time is a wrapper around time.Time which supports correct marshaling to YAML and JSON. Wrappers are provided for many of the factory methods that the time package offers.taint.value (string)The taint value corresponding to the taint key. Must be a label value.deviceSelector (DeviceTaintSelector)DeviceSelector defines which device(s) the taint is applied to. All selector criteria must be satisfied for a device to match. The empty selector matches all devices. Without a selector, no devices are matches.DeviceTaintSelector defines which device(s) a DeviceTaintRule applies to. The empty selector matches all devices. Without a selector, no devices are matched.deviceSelector.device (string)If device is set, only devices with that name are selected. This field corresponds to slice.spec.devices[].name.Setting also driver and pool may be required to avoid ambiguity, but is not required.deviceSelector.deviceClassName (string)If DeviceClassName is set, the selectors defined there must be satisfied by a device to be selected. This field corresponds to class.metadata.name.deviceSelector.driver (string)If driver is set, only devices from that driver are selected. This fields corresponds to slice.spec.driver.deviceSelector.pool (string)If pool is set, only devices in that pool are selected.Also setting the driver name may be useful to avoid ambiguity when different drivers use the same pool name, but this is not required because selecting pools from different drivers may also be useful, for example when drivers with node-local devices use the node name as their pool name.deviceSelector.selectors ([]DeviceS


Question: How does DeviceTaintRule v1alpha3 work?

Answer: DeviceTaintRule v1alpha3DeviceTaintRule adds one taint to all devices which match the selector.apiVersion: resource.k8s.io/v1alpha3import "k8s.io/api/resource/v1alpha3"DeviceTaintRuleDeviceTaintRule adds one taint to all devices which match the selector. This has the same effect as if the taint was specified directly in the ResourceSlice by the DRA driver.apiVersion: resource.k8s.io/v1alpha3kind: DeviceTaintRulemetadata (ObjectMeta)Standard object metadataspec (DeviceTaintRuleSpec), requiredSpec specifies the selector and one taint.Changing the spec automatically increments the metadata.generation number.DeviceTaintRuleSpecDeviceTaintRuleSpec specifies the selector and one taint.taint (DeviceTaint), requiredThe taint that gets applied to matching devices.The device this taint is attached to has the "effect" on any claim which does not tolerate the taint and, through the claim, to pods using the claim.taint.effect (string), requiredThe effect of the taint on claims that do not tolerate the taint and through such claims on the pods using them. Valid effects are NoSchedule and NoExecute. PreferNoSchedule as used for nodes is not valid here.taint.key (string), requiredThe taint key to be applied to a device. Must be a label name.taint.timeAdded (Time)TimeAdded represents the time at which the taint was added. Added automatically during create or update if not set.Time is a wrapper around time.Time which supports correct marshaling to YAML and JSON. Wrappers are provided for many of the factory methods that the time package offers.taint.value (string)The taint value corresponding to the taint key. Must be a label value.deviceSelector (DeviceTaintSelector)DeviceSelector defines which device(s) the taint is applied to. All selector criteria must be satisfied for a device to match. The empty selector matches all devices. Without a selector, no devices are matches.DeviceTaintSelector defines which device(s) a DeviceTaintRule applies to. The empty selector matches all devices. Without a selector, no devices are matched.deviceSelector.device (string)If device is set, only devices with that name are selected. This field corresponds to slice.spec.devices[].name.Setting also driver and pool may be required to avoid ambiguity, but is not required.deviceSelector.deviceClassName (string)If DeviceClassName is set, the selectors defined there must be satisfied by a device to be selected. This field corresponds to class.metadata.name.deviceSelector.driver (string)If driver is set, only devices from that driver are selected. This fields corresponds to slice.spec.driver.deviceSelector.pool (string)If pool is set, only devices in that pool are selected.Also setting the driver name may be useful to avoid ambiguity when different drivers use the same pool name, but this is not required because selecting pools from different drivers may also be useful, for example when drivers with node-local devices use the node name as their pool name.deviceSelector.selectors ([]DeviceS


Question: When would you use DeviceTaintRule v1alpha3?

Answer: DeviceTaintRule v1alpha3DeviceTaintRule adds one taint to all devices which match the selector.apiVersion: resource.k8s.io/v1alpha3import "k8s.io/api/resource/v1alpha3"DeviceTaintRuleDeviceTaintRule adds one taint to all devices which match the selector. This has the same effect as if the taint was specified directly in the ResourceSlice by the DRA driver.apiVersion: resource.k8s.io/v1alpha3kind: DeviceTaintRulemetadata (ObjectMeta)Standard object metadataspec (DeviceTaintRuleSpec), requiredSpec specifies the selector and one taint.Changing the spec automatically increments the metadata.generation number.DeviceTaintRuleSpecDeviceTaintRuleSpec specifies the selector and one taint.taint (DeviceTaint), requiredThe taint that gets applied to matching devices.The device this taint is attached to has the "effect" on any claim which does not tolerate the taint and, through the claim, to pods using the claim.taint.effect (string), requiredThe effect of the taint on claims that do not tolerate the taint and through such claims on the pods using them. Valid effects are NoSchedule and NoExecute. PreferNoSchedule as used for nodes is not valid here.taint.key (string), requiredThe taint key to be applied to a device. Must be a label name.taint.timeAdded (Time)TimeAdded represents the time at which the taint was added. Added automatically during create or update if not set.Time is a wrapper around time.Time which supports correct marshaling to YAML and JSON. Wrappers are provided for many of the factory methods that the time package offers.taint.value (string)The taint value corresponding to the taint key. Must be a label value.deviceSelector (DeviceTaintSelector)DeviceSelector defines which device(s) the taint is applied to. All selector criteria must be satisfied for a device to match. The empty selector matches all devices. Without a selector, no devices are matches.DeviceTaintSelector defines which device(s) a DeviceTaintRule applies to. The empty selector matches all devices. Without a selector, no devices are matched.deviceSelector.device (string)If device is set, only devices with that name are selected. This field corresponds to slice.spec.devices[].name.Setting also driver and pool may be required to avoid ambiguity, but is not required.deviceSelector.deviceClassName (string)If DeviceClassName is set, the selectors defined there must be satisfied by a device to be selected. This field corresponds to class.metadata.name.deviceSelector.driver (string)If driver is set, only devices from that driver are selected. This fields corresponds to slice.spec.driver.deviceSelector.pool (string)If pool is set, only devices in that pool are selected.Also setting the driver name may be useful to avoid ambiguity when different drivers use the same pool name, but this is not required because selecting pools from different drivers may also be useful, for example when drivers with node-local devices use the node name as their pool name.deviceSelector.selectors ([]DeviceS


Question: What are the benefits of DeviceTaintRule v1alpha3?

Answer: DeviceTaintRule v1alpha3DeviceTaintRule adds one taint to all devices which match the selector.apiVersion: resource.k8s.io/v1alpha3import "k8s.io/api/resource/v1alpha3"DeviceTaintRuleDeviceTaintRule adds one taint to all devices which match the selector. This has the same effect as if the taint was specified directly in the ResourceSlice by the DRA driver.apiVersion: resource.k8s.io/v1alpha3kind: DeviceTaintRulemetadata (ObjectMeta)Standard object metadataspec (DeviceTaintRuleSpec), requiredSpec specifies the selector and one taint.Changing the spec automatically increments the metadata.generation number.DeviceTaintRuleSpecDeviceTaintRuleSpec specifies the selector and one taint.taint (DeviceTaint), requiredThe taint that gets applied to matching devices.The device this taint is attached to has the "effect" on any claim which does not tolerate the taint and, through the claim, to pods using the claim.taint.effect (string), requiredThe effect of the taint on claims that do not tolerate the taint and through such claims on the pods using them. Valid effects are NoSchedule and NoExecute. PreferNoSchedule as used for nodes is not valid here.taint.key (string), requiredThe taint key to be applied to a device. Must be a label name.taint.timeAdded (Time)TimeAdded represents the time at which the taint was added. Added automatically during create or update if not set.Time is a wrapper around time.Time which supports correct marshaling to YAML and JSON. Wrappers are provided for many of the factory methods that the time package offers.taint.value (string)The taint value corresponding to the taint key. Must be a label value.deviceSelector (DeviceTaintSelector)DeviceSelector defines which device(s) the taint is applied to. All selector criteria must be satisfied for a device to match. The empty selector matches all devices. Without a selector, no devices are matches.DeviceTaintSelector defines which device(s) a DeviceTaintRule applies to. The empty selector matches all devices. Without a selector, no devices are matched.deviceSelector.device (string)If device is set, only devices with that name are selected. This field corresponds to slice.spec.devices[].name.Setting also driver and pool may be required to avoid ambiguity, but is not required.deviceSelector.deviceClassName (string)If DeviceClassName is set, the selectors defined there must be satisfied by a device to be selected. This field corresponds to class.metadata.name.deviceSelector.driver (string)If driver is set, only devices from that driver are selected. This fields corresponds to slice.spec.driver.deviceSelector.pool (string)If pool is set, only devices in that pool are selected.Also setting the driver name may be useful to avoid ambiguity when different drivers use the same pool name, but this is not required because selecting pools from different drivers may also be useful, for example when drivers with node-local devices use the node name as their pool name.deviceSelector.selectors ([]DeviceS


Question: What is DeviceTaintRule v1alpha3?

Answer: a p i V e r s i o n :   r e s o u r c e . k 8 s . i o / v 1 a l p h a 3   i m p o r t   " k 8 s . i o / a p i / r e s o u r c e / v 1 a l p h a 3 "


Question: What is DeviceTaintRule?

Answer: D e v i c e T a i n t R u l e   a d d s   o n e   t a i n t   t o   a l l   d e v i c e s   w h i c h   m a t c h   t h e   s e l e c t o r .   T h i s   h a s   t h e   s a m e   e f f e c t   a s   i f   t h e   t a i n t   w a s   s p e c i f i e d   d i r e c t l y   i n   t h e   R e s o u r c e S l i c e   b y   t h e   D R A   d r i v e r .   a p i V e r s i o n :   r e s o u r c e . k 8 s . i o / v 1 a l p h a 3 k i n d :   D e v i c e T a i n t R u l e m e t a d a t a   ( O b j e c t M e t a ) S t a n d a r d   o b j e c t   m e t a d a t a s p e c   ( D e v i c e T a i n t R u l e S p e c ) ,   r e q u i r e d S p e c   s p e c i f i e s   t h e   s e l e c t o r   a n d   o n e   t a i n t . C h a n g i n g   t h e   s p e c   a u t o m a t i c a l l y   i n c r e m e n t s   t h e   m e t a d a t a . g e n e r a t i o n   n u m b e r .   a p i V e r s i o n :   r e s o u r c e . k 8 s . i o / v 1 a l p h a 3   k i n d :   D e v i c e T a i n t R u l e   m e t a d a t a   ( O b j e c t M e t a )   S t a n d a r d   o b j e c t   m e t a d a t a   s p e c   ( D e v i c e T a i n t R u l e S p e c ) ,   r e q u i r e d   S p e c   s p e c i f i e s   t h e   s e l e c t o r   a n d   o n e   t a i n t .   C h a n g i n g   t h e   s p e c   a u t o m a t i c a l l y   i n c r e m e n t s   t h e   m e t a d a t a . g e n e r a t i o n   n u m b e r .


Question: What is DeviceTaintRuleSpec?

Answer: D e v i c e T a i n t R u l e S p e c   s p e c i f i e s   t h e   s e l e c t o r   a n d   o n e   t a i n t .   t a i n t   ( D e v i c e T a i n t ) ,   r e q u i r e d T h e   t a i n t   t h a t   g e t s   a p p l i e d   t o   m a t c h i n g   d e v i c e s . T h e   d e v i c e   t h i s   t a i n t   i s   a t t a c h e d   t o   h a s   t h e   " e f f e c t "   o n   a n y   c l a i m   w h i c h   d o e s   n o t   t o l e r a t e   t h e   t a i n t   a n d ,   t h r o u g h   t h e   c l a i m ,   t o   p o d s   u s i n g   t h e   c l a i m . t a i n t . e f f e c t   ( s t r i n g ) ,   r e q u i r e d T h e   e f f e c t   o f   t h e   t a i n t   o n   c l a i m s   t h a t   d o   n o t   t o l e r a t e   t h e   t a i n t   a n d   t h r o u g h   s u c h   c l a i m s   o n   t h e   p o d s   u s i n g   t h e m .   V a l i d   e f f e c t s   a r e   N o S c h e d u l e   a n d   N o E x e c u t e .   P r e f e r N o S c h e d u l e   a s   u s e d   f o r   n o d e s   i s   n o t   v a l i d   h e r e . t a i n t . k e y   ( s t r i n g ) ,   r e q u i r e d T h e   t a i n t   k e y   t o   b e   a p p l i e d   t o   a   d e v i c e .   M u s t   b e   a   l a b e l   n a m e . t a i n t . t i m e A d d e d   ( T i m e ) T i m e A d d e d   r e p r e s e n t s   t h e   t i m e   a t   w h i c h   t h e   t a i n t   w a s   a d d e d .   A d d e d   a u t o m a t i c a l l y   d u r i n g   c r e a t e   o r   u p d a t e   i f   n o t   s e t . T i m e   i s   a   w r a p p e r   a r o u n d   t i m e . T i m e   w h i c h   s u p p o r t s   c o r r e c t   m a r s h a l i n g   t o   Y A M L   a n d   J S O N .   W r a p p e r s   a r e   p r o v i d e d   f o r   m a n y   o f   t h e   f a c t o r y   m e t h o d s   t h a t   t h e   t i m e   p a c k a g e   o f f e r s . t a i n t . v a l u e   ( s t r i n g ) T h e   t a i n t   v a l u e   c o r r e s p o n d i n g   t o   t h e   t a i n t   k e y .   M u s t   b e   a


Question: What is DeviceTaintRuleList?

Answer: D e v i c e T a i n t R u l e L i s t   i s   a   c o l l e c t i o n   o f   D e v i c e T a i n t R u l e s .   a p i V e r s i o n :   r e s o u r c e . k 8 s . i o / v 1 a l p h a 3 k i n d :   D e v i c e T a i n t R u l e L i s t m e t a d a t a   ( L i s t M e t a ) S t a n d a r d   l i s t   m e t a d a t a i t e m s   ( [ ] D e v i c e T a i n t R u l e ) ,   r e q u i r e d I t e m s   i s   t h e   l i s t   o f   D e v i c e T a i n t R u l e s .   a p i V e r s i o n :   r e s o u r c e . k 8 s . i o / v 1 a l p h a 3   k i n d :   D e v i c e T a i n t R u l e L i s t   m e t a d a t a   ( L i s t M e t a )   S t a n d a r d   l i s t   m e t a d a t a   i t e m s   ( [ ] D e v i c e T a i n t R u l e ) ,   r e q u i r e d   I t e m s   i s   t h e   l i s t   o f   D e v i c e T a i n t R u l e s .


Question: What is HTTP Request?

Answer: G E T   / a p i s / r e s o u r c e . k 8 s . i o / v 1 a l p h a 3 / d e v i c e t a i n t r u l e s / { n a m e }


Question: What is Parameters?

Answer: n a m e   ( i n   p a t h ) :   s t r i n g ,   r e q u i r e d n a m e   o f   t h e   D e v i c e T a i n t R u l e p r e t t y   ( i n   q u e r y ) :   s t r i n g p r e t t y   n a m e   ( i n   p a t h ) :   s t r i n g ,   r e q u i r e d   n a m e   o f   t h e   D e v i c e T a i n t R u l e   p r e t t y   ( i n   q u e r y ) :   s t r i n g   p r e t t y


Question: What is Response?

Answer: 2 0 0   ( D e v i c e T a i n t R u l e ) :   O K   4 0 1 :   U n a u t h o r i z e d


Question: What is HTTP Request?

Answer: G E T   / a p i s / r e s o u r c e . k 8 s . i o / v 1 a l p h a 3 / d e v i c e t a i n t r u l e s


Question: What is Parameters?

Answer: a l l o w W a t c h B o o k m a r k s   ( i n   q u e r y ) :   b o o l e a n a l l o w W a t c h B o o k m a r k s c o n t i n u e   ( i n   q u e r y ) :   s t r i n g c o n t i n u e f i e l d S e l e c t o r   ( i n   q u e r y ) :   s t r i n g f i e l d S e l e c t o r l a b e l S e l e c t o r   ( i n   q u e r y ) :   s t r i n g l a b e l S e l e c t o r l i m i t   ( i n   q u e r y ) :   i n t e g e r l i m i t p r e t t y   ( i n   q u e r y ) :   s t r i n g p r e t t y r e s o u r c e V e r s i o n   ( i n   q u e r y ) :   s t r i n g r e s o u r c e V e r s i o n r e s o u r c e V e r s i o n M a t c h   ( i n   q u e r y ) :   s t r i n g r e s o u r c e V e r s i o n M a t c h s e n d I n i t i a l E v e n t s   ( i n   q u e r y ) :   b o o l e a n s e n d I n i t i a l E v e n t s t i m e o u t S e c o n d s   ( i n   q u e r y ) :   i n t e g e r t i m e o u t S e c o n d s w a t c h   ( i n   q u e r y ) :   b o o l e a n w a t c h   a l l o w W a t c h B o o k m a r k s   ( i n   q u e r y ) :   b o o l e a n   a l l o w W a t c h B o o k m a r k s   c o n t i n u e   ( i n   q u e r y ) :   s t r i n g   c o n t i n u e   f i e l d S e l e c t o r   ( i n   q u e r y ) :   s t r i n g   f i e l d S e l e c t o r   l a b e l S e l e c t o r   ( i n   q u e r y ) :   s t r i n g   l a b e l S e l e c t o r   l i m i t   ( i n   q u e r y ) :   i n t e g e r   l i m i t   p r e t t y   ( i n   q u e r y ) :   s t r i n g   p r e t t y   r e s o u r c e V e r s i o n   ( i n   q u e r y ) :   s t r i n g   r e s o u r c e V e r s i o n   r e s o u r c e V e r s i o n M a t c h   ( i n   q u e r y ) :   s t r i n g   r e s o u r c e V e r s i o n M a t c h   s e n d I n i t i a l E v e n t s   ( i n   q u e r y ) :   b o o l e a n   s e n d I n i t i a l E v e n t s   t i m e o u t S e c o n d s   ( i n   q u e r y ) :   i n t e g e r   t i m e o u t S e c o n d s   w a t c h   ( i n   q u e r y ) :   b o o l e a n   w a t c h


Question: What is Response?

Answer: 2 0 0   ( D e v i c e T a i n t R u l e L i s t ) :   O K   4 0 1 :   U n a u t h o r i z e d


Question: What is HTTP Request?

Answer: P O S T   / a p i s / r e s o u r c e . k 8 s . i o / v 1 a l p h a 3 / d e v i c e t a i n t r u l e s


Question: What is Parameters?

Answer: b o d y :   D e v i c e T a i n t R u l e ,   r e q u i r e d d r y R u n   ( i n   q u e r y ) :   s t r i n g d r y R u n f i e l d M a n a g e r   ( i n   q u e r y ) :   s t r i n g f i e l d M a n a g e r f i e l d V a l i d a t i o n   ( i n   q u e r y ) :   s t r i n g f i e l d V a l i d a t i o n p r e t t y   ( i n   q u e r y ) :   s t r i n g p r e t t y   b o d y :   D e v i c e T a i n t R u l e ,   r e q u i r e d   d r y R u n   ( i n   q u e r y ) :   s t r i n g   d r y R u n   f i e l d M a n a g e r   ( i n   q u e r y ) :   s t r i n g   f i e l d M a n a g e r   f i e l d V a l i d a t i o n   ( i n   q u e r y ) :   s t r i n g   f i e l d V a l i d a t i o n   p r e t t y   ( i n   q u e r y ) :   s t r i n g   p r e t t y


Question: What is Response?

Answer: 2 0 0   ( D e v i c e T a i n t R u l e ) :   O K   2 0 1   ( D e v i c e T a i n t R u l e ) :   C r e a t e d   2 0 2   ( D e v i c e T a i n t R u l e ) :   A c c e p t e d   4 0 1 :   U n a u t h o r i z e d


Question: What is HTTP Request?

Answer: P U T   / a p i s / r e s o u r c e . k 8 s . i o / v 1 a l p h a 3 / d e v i c e t a i n t r u l e s / { n a m e }


Question: What is Parameters?

Answer: n a m e   ( i n   p a t h ) :   s t r i n g ,   r e q u i r e d n a m e   o f   t h e   D e v i c e T a i n t R u l e b o d y :   D e v i c e T a i n t R u l e ,   r e q u i r e d d r y R u n   ( i n   q u e r y ) :   s t r i n g d r y R u n f i e l d M a n a g e r   ( i n   q u e r y ) :   s t r i n g f i e l d M a n a g e r f i e l d V a l i d a t i o n   ( i n   q u e r y ) :   s t r i n g f i e l d V a l i d a t i o n p r e t t y   ( i n   q u e r y ) :   s t r i n g p r e t t y   n a m e   ( i n   p a t h ) :   s t r i n g ,   r e q u i r e d   n a m e   o f   t h e   D e v i c e T a i n t R u l e   b o d y :   D e v i c e T a i n t R u l e ,   r e q u i r e d   d r y R u n   ( i n   q u e r y ) :   s t r i n g   d r y R u n   f i e l d M a n a g e r   ( i n   q u e r y ) :   s t r i n g   f i e l d M a n a g e r   f i e l d V a l i d a t i o n   ( i n   q u e r y ) :   s t r i n g   f i e l d V a l i d a t i o n   p r e t t y   ( i n   q u e r y ) :   s t r i n g   p r e t t y


Question: What is Response?

Answer: 2 0 0   ( D e v i c e T a i n t R u l e ) :   O K   2 0 1   ( D e v i c e T a i n t R u l e ) :   C r e a t e d   4 0 1 :   U n a u t h o r i z e d


Question: What is HTTP Request?

Answer: P A T C H   / a p i s / r e s o u r c e . k 8 s . i o / v 1 a l p h a 3 / d e v i c e t a i n t r u l e s / { n a m e }


Question: What is Parameters?

Answer: n a m e   ( i n   p a t h ) :   s t r i n g ,   r e q u i r e d n a m e   o f   t h e   D e v i c e T a i n t R u l e b o d y :   P a t c h ,   r e q u i r e d d r y R u n   ( i n   q u e r y ) :   s t r i n g d r y R u n f i e l d M a n a g e r   ( i n   q u e r y ) :   s t r i n g f i e l d M a n a g e r f i e l d V a l i d a t i o n   ( i n   q u e r y ) :   s t r i n g f i e l d V a l i d a t i o n f o r c e   ( i n   q u e r y ) :   b o o l e a n f o r c e p r e t t y   ( i n   q u e r y ) :   s t r i n g p r e t t y   n a m e   ( i n   p a t h ) :   s t r i n g ,   r e q u i r e d   n a m e   o f   t h e   D e v i c e T a i n t R u l e   b o d y :   P a t c h ,   r e q u i r e d   d r y R u n   ( i n   q u e r y ) :   s t r i n g   d r y R u n   f i e l d M a n a g e r   ( i n   q u e r y ) :   s t r i n g   f i e l d M a n a g e r   f i e l d V a l i d a t i o n   ( i n   q u e r y ) :   s t r i n g   f i e l d V a l i d a t i o n   f o r c e   ( i n   q u e r y ) :   b o o l e a n   f o r c e   p r e t t y   ( i n   q u e r y ) :   s t r i n g   p r e t t y


Question: What is Response?

Answer: 2 0 0   ( D e v i c e T a i n t R u l e ) :   O K   2 0 1   ( D e v i c e T a i n t R u l e ) :   C r e a t e d   4 0 1 :   U n a u t h o r i z e d


Question: What is HTTP Request?

Answer: D E L E T E   / a p i s / r e s o u r c e . k 8 s . i o / v 1 a l p h a 3 / d e v i c e t a i n t r u l e s / { n a m e }


Question: What is Parameters?

Answer: n a m e   ( i n   p a t h ) :   s t r i n g ,   r e q u i r e d n a m e   o f   t h e   D e v i c e T a i n t R u l e b o d y :   D e l e t e O p t i o n s d r y R u n   ( i n   q u e r y ) :   s t r i n g d r y R u n g r a c e P e r i o d S e c o n d s   ( i n   q u e r y ) :   i n t e g e r g r a c e P e r i o d S e c o n d s i g n o r e S t o r e R e a d E r r o r W i t h C l u s t e r B r e a k i n g P o t e n t i a l   ( i n   q u e r y ) :   b o o l e a n i g n o r e S t o r e R e a d E r r o r W i t h C l u s t e r B r e a k i n g P o t e n t i a l p r e t t y   ( i n   q u e r y ) :   s t r i n g p r e t t y p r o p a g a t i o n P o l i c y   ( i n   q u e r y ) :   s t r i n g p r o p a g a t i o n P o l i c y   n a m e   ( i n   p a t h ) :   s t r i n g ,   r e q u i r e d   n a m e   o f   t h e   D e v i c e T a i n t R u l e   b o d y :   D e l e t e O p t i o n s   d r y R u n   ( i n   q u e r y ) :   s t r i n g   d r y R u n   g r a c e P e r i o d S e c o n d s   ( i n   q u e r y ) :   i n t e g e r   g r a c e P e r i o d S e c o n d s   i g n o r e S t o r e R e a d E r r o r W i t h C l u s t e r B r e a k i n g P o t e n t i a l   ( i n   q u e r y ) :   b o o l e a n   i g n o r e S t o r e R e a d E r r o r W i t h C l u s t e r B r e a k i n g P o t e n t i a l   p r e t t y   ( i n   q u e r y ) :   s t r i n g   p r e t t y   p r o p a g a t i o n P o l i c y   ( i n   q u e r y ) :   s t r i n g   p r o p a g a t i o n P o l i c y


Question: What is Response?

Answer: 2 0 0   ( D e v i c e T a i n t R u l e ) :   O K   2 0 2   ( D e v i c e T a i n t R u l e ) :   A c c e p t e d   4 0 1 :   U n a u t h o r i z e d


Question: What is HTTP Request?

Answer: D E L E T E   / a p i s / r e s o u r c e . k 8 s . i o / v 1 a l p h a 3 / d e v i c e t a i n t r u l e s


Question: What is Parameters?

Answer: b o d y :   D e l e t e O p t i o n s c o n t i n u e   ( i n   q u e r y ) :   s t r i n g c o n t i n u e d r y R u n   ( i n   q u e r y ) :   s t r i n g d r y R u n f i e l d S e l e c t o r   ( i n   q u e r y ) :   s t r i n g f i e l d S e l e c t o r g r a c e P e r i o d S e c o n d s   ( i n   q u e r y ) :   i n t e g e r g r a c e P e r i o d S e c o n d s i g n o r e S t o r e R e a d E r r o r W i t h C l u s t e r B r e a k i n g P o t e n t i a l   ( i n   q u e r y ) :   b o o l e a n i g n o r e S t o r e R e a d E r r o r W i t h C l u s t e r B r e a k i n g P o t e n t i a l l a b e l S e l e c t o r   ( i n   q u e r y ) :   s t r i n g l a b e l S e l e c t o r l i m i t   ( i n   q u e r y ) :   i n t e g e r l i m i t p r e t t y   ( i n   q u e r y ) :   s t r i n g p r e t t y p r o p a g a t i o n P o l i c y   ( i n   q u e r y ) :   s t r i n g p r o p a g a t i o n P o l i c y r e s o u r c e V e r s i o n   ( i n   q u e r y ) :   s t r i n g r e s o u r c e V e r s i o n r e s o u r c e V e r s i o n M a t c h   ( i n   q u e r y ) :   s t r i n g r e s o u r c e V e r s i o n M a t c h s e n d I n i t i a l E v e n t s   ( i n   q u e r y ) :   b o o l e a n s e n d I n i t i a l E v e n t s t i m e o u t S e c o n d s   ( i n   q u e r y ) :   i n t e g e r t i m e o u t S e c o n d s   b o d y :   D e l e t e O p t i o n s   c o n t i n u e   ( i n   q u e r y ) :   s t r i n g   c o n t i n u e   d r y R u n   ( i n   q u e r y ) :   s t r i n g   d r y R u n   f i e l d S e l e c t o r   ( i n   q u e r y ) :   s t r i n g   f i e l d S e l e c t o r   g r a c e P e r i o d S e c o n d s   ( i n   q u e r y ) :   i n t e g e r   g r a c e P e r i o d S e c o n d s   i g n o r e S t o r e R e a d E r r o r W i t h C l u s t e r B r e a k i n g P o t e n t i a l   ( i n   q u e r y ) :   b o o l e a n   i g n o r e S t o r e R e a d E r r o r W i t h C l u s t e r B r e a k i n g P o t e n t i a l   l a b e l S e l e c t o r   (


Question: What is Response?

Answer: 2 0 0   ( S t a t u s ) :   O K   4 0 1 :   U n a u t h o r i z e d   T h i s   p a g e   i s   a u t o m a t i c a l l y   g e n e r a t e d .   I f   y o u   p l a n   t o   r e p o r t   a n   i s s u e   w i t h   t h i s   p a g e ,   m e n t i o n   t h a t   t h e   p a g e   i s   a u t o - g e n e r a t e d   i n   y o u r   i s s u e   d e s c r i p t i o n .   T h e   f i x   m a y   n e e d   t o   h a p p e n   e l s e w h e r e   i n   t h e   K u b e r n e t e s   p r o j e c t .


Question: What is kube-proxy?

Answer: kube-proxySynopsisThe Kubernetes network proxy runs on each node. This reflects services as defined in the Kubernetes API on each node and can do simple TCP, UDP, and SCTP stream forwarding or round robin TCP, UDP, and SCTP forwarding across a set of backends. Service cluster IPs and ports are currently found through Docker-links-compatible environment variables specifying ports opened by the service proxy. There is an optional addon that provides cluster DNS for these cluster IPs. The user must create a service with the apiserver API to configure the proxy.kube-proxy [flags] Options--add_dir_headerIf true, adds the file directory to the header of the log messages--alsologtostderrlog to standard error as well as files (no effect when -logtostderr=true)--bind-address string Default: 0.0.0.0Overrides kube-proxy's idea of what its node's primary IP is. Note that the name is a historical artifact, and kube-proxy does not actually bind any sockets to this IP. This parameter is ignored if a config file is specified by --config.--bind-address-hard-failIf true kube-proxy will treat failure to bind to a port as fatal and exit--cleanupIf true cleanup iptables and ipvs rules and exit.--cluster-cidr stringThe CIDR range of the pods in the cluster. (For dual-stack clusters, this can be a comma-separated dual-stack pair of CIDR ranges.). When --detect-local-mode is set to ClusterCIDR, kube-proxy will consider traffic to be local if its source IP is in this range. (Otherwise it is not used.) This parameter is ignored if a config file is specified by --config.--config stringThe path to the configuration file.--config-sync-period duration Default: 15m0sHow often configuration from the apiserver is refreshed. Must be greater than 0.--conntrack-max-per-core int32 Default: 32768Maximum number of NAT connections to track per CPU core (0 to leave the limit as-is and ignore conntrack-min).--conntrack-min int32 Default: 131072Minimum number of conntrack entries to allocate, regardless of conntrack-max-per-core (set conntrack-max-per-core=0 to leave the limit as-is).--conntrack-tcp-be-liberalEnable liberal mode for tracking TCP packets by setting nf_conntrack_tcp_be_liberal to 1--conntrack-tcp-timeout-close-wait duration Default: 1h0m0sNAT timeout for TCP connections in the CLOSE_WAIT state--conntrack-tcp-timeout-established duration Default: 24h0m0sIdle timeout for established TCP connections (0 to leave as-is)--conntrack-udp-timeout durationIdle timeout for UNREPLIED UDP connections (0 to leave as-is)--conntrack-udp-timeout-stream durationIdle timeout for ASSURED UDP connections (0 to leave as-is)--detect-local-mode LocalModeMode to use to detect local traffic. This parameter is ignored if a config file is specified by --config.--feature-gates <comma-separated 'key=True|False' pairs>A set of key=value pairs that describe feature gates for alpha/experimental features. Options are:APIResponseCompression=true|false (BETA - default=true)APIServerIdentity=true|false (BETA -


Question: How does kube-proxy work?

Answer: kube-proxySynopsisThe Kubernetes network proxy runs on each node. This reflects services as defined in the Kubernetes API on each node and can do simple TCP, UDP, and SCTP stream forwarding or round robin TCP, UDP, and SCTP forwarding across a set of backends. Service cluster IPs and ports are currently found through Docker-links-compatible environment variables specifying ports opened by the service proxy. There is an optional addon that provides cluster DNS for these cluster IPs. The user must create a service with the apiserver API to configure the proxy.kube-proxy [flags] Options--add_dir_headerIf true, adds the file directory to the header of the log messages--alsologtostderrlog to standard error as well as files (no effect when -logtostderr=true)--bind-address string Default: 0.0.0.0Overrides kube-proxy's idea of what its node's primary IP is. Note that the name is a historical artifact, and kube-proxy does not actually bind any sockets to this IP. This parameter is ignored if a config file is specified by --config.--bind-address-hard-failIf true kube-proxy will treat failure to bind to a port as fatal and exit--cleanupIf true cleanup iptables and ipvs rules and exit.--cluster-cidr stringThe CIDR range of the pods in the cluster. (For dual-stack clusters, this can be a comma-separated dual-stack pair of CIDR ranges.). When --detect-local-mode is set to ClusterCIDR, kube-proxy will consider traffic to be local if its source IP is in this range. (Otherwise it is not used.) This parameter is ignored if a config file is specified by --config.--config stringThe path to the configuration file.--config-sync-period duration Default: 15m0sHow often configuration from the apiserver is refreshed. Must be greater than 0.--conntrack-max-per-core int32 Default: 32768Maximum number of NAT connections to track per CPU core (0 to leave the limit as-is and ignore conntrack-min).--conntrack-min int32 Default: 131072Minimum number of conntrack entries to allocate, regardless of conntrack-max-per-core (set conntrack-max-per-core=0 to leave the limit as-is).--conntrack-tcp-be-liberalEnable liberal mode for tracking TCP packets by setting nf_conntrack_tcp_be_liberal to 1--conntrack-tcp-timeout-close-wait duration Default: 1h0m0sNAT timeout for TCP connections in the CLOSE_WAIT state--conntrack-tcp-timeout-established duration Default: 24h0m0sIdle timeout for established TCP connections (0 to leave as-is)--conntrack-udp-timeout durationIdle timeout for UNREPLIED UDP connections (0 to leave as-is)--conntrack-udp-timeout-stream durationIdle timeout for ASSURED UDP connections (0 to leave as-is)--detect-local-mode LocalModeMode to use to detect local traffic. This parameter is ignored if a config file is specified by --config.--feature-gates <comma-separated 'key=True|False' pairs>A set of key=value pairs that describe feature gates for alpha/experimental features. Options are:APIResponseCompression=true|false (BETA - default=true)APIServerIdentity=true|false (BETA -


Question: When would you use kube-proxy?

Answer: kube-proxySynopsisThe Kubernetes network proxy runs on each node. This reflects services as defined in the Kubernetes API on each node and can do simple TCP, UDP, and SCTP stream forwarding or round robin TCP, UDP, and SCTP forwarding across a set of backends. Service cluster IPs and ports are currently found through Docker-links-compatible environment variables specifying ports opened by the service proxy. There is an optional addon that provides cluster DNS for these cluster IPs. The user must create a service with the apiserver API to configure the proxy.kube-proxy [flags] Options--add_dir_headerIf true, adds the file directory to the header of the log messages--alsologtostderrlog to standard error as well as files (no effect when -logtostderr=true)--bind-address string Default: 0.0.0.0Overrides kube-proxy's idea of what its node's primary IP is. Note that the name is a historical artifact, and kube-proxy does not actually bind any sockets to this IP. This parameter is ignored if a config file is specified by --config.--bind-address-hard-failIf true kube-proxy will treat failure to bind to a port as fatal and exit--cleanupIf true cleanup iptables and ipvs rules and exit.--cluster-cidr stringThe CIDR range of the pods in the cluster. (For dual-stack clusters, this can be a comma-separated dual-stack pair of CIDR ranges.). When --detect-local-mode is set to ClusterCIDR, kube-proxy will consider traffic to be local if its source IP is in this range. (Otherwise it is not used.) This parameter is ignored if a config file is specified by --config.--config stringThe path to the configuration file.--config-sync-period duration Default: 15m0sHow often configuration from the apiserver is refreshed. Must be greater than 0.--conntrack-max-per-core int32 Default: 32768Maximum number of NAT connections to track per CPU core (0 to leave the limit as-is and ignore conntrack-min).--conntrack-min int32 Default: 131072Minimum number of conntrack entries to allocate, regardless of conntrack-max-per-core (set conntrack-max-per-core=0 to leave the limit as-is).--conntrack-tcp-be-liberalEnable liberal mode for tracking TCP packets by setting nf_conntrack_tcp_be_liberal to 1--conntrack-tcp-timeout-close-wait duration Default: 1h0m0sNAT timeout for TCP connections in the CLOSE_WAIT state--conntrack-tcp-timeout-established duration Default: 24h0m0sIdle timeout for established TCP connections (0 to leave as-is)--conntrack-udp-timeout durationIdle timeout for UNREPLIED UDP connections (0 to leave as-is)--conntrack-udp-timeout-stream durationIdle timeout for ASSURED UDP connections (0 to leave as-is)--detect-local-mode LocalModeMode to use to detect local traffic. This parameter is ignored if a config file is specified by --config.--feature-gates <comma-separated 'key=True|False' pairs>A set of key=value pairs that describe feature gates for alpha/experimental features. Options are:APIResponseCompression=true|false (BETA - default=true)APIServerIdentity=true|false (BETA -


Question: What are the benefits of kube-proxy?

Answer: kube-proxySynopsisThe Kubernetes network proxy runs on each node. This reflects services as defined in the Kubernetes API on each node and can do simple TCP, UDP, and SCTP stream forwarding or round robin TCP, UDP, and SCTP forwarding across a set of backends. Service cluster IPs and ports are currently found through Docker-links-compatible environment variables specifying ports opened by the service proxy. There is an optional addon that provides cluster DNS for these cluster IPs. The user must create a service with the apiserver API to configure the proxy.kube-proxy [flags] Options--add_dir_headerIf true, adds the file directory to the header of the log messages--alsologtostderrlog to standard error as well as files (no effect when -logtostderr=true)--bind-address string Default: 0.0.0.0Overrides kube-proxy's idea of what its node's primary IP is. Note that the name is a historical artifact, and kube-proxy does not actually bind any sockets to this IP. This parameter is ignored if a config file is specified by --config.--bind-address-hard-failIf true kube-proxy will treat failure to bind to a port as fatal and exit--cleanupIf true cleanup iptables and ipvs rules and exit.--cluster-cidr stringThe CIDR range of the pods in the cluster. (For dual-stack clusters, this can be a comma-separated dual-stack pair of CIDR ranges.). When --detect-local-mode is set to ClusterCIDR, kube-proxy will consider traffic to be local if its source IP is in this range. (Otherwise it is not used.) This parameter is ignored if a config file is specified by --config.--config stringThe path to the configuration file.--config-sync-period duration Default: 15m0sHow often configuration from the apiserver is refreshed. Must be greater than 0.--conntrack-max-per-core int32 Default: 32768Maximum number of NAT connections to track per CPU core (0 to leave the limit as-is and ignore conntrack-min).--conntrack-min int32 Default: 131072Minimum number of conntrack entries to allocate, regardless of conntrack-max-per-core (set conntrack-max-per-core=0 to leave the limit as-is).--conntrack-tcp-be-liberalEnable liberal mode for tracking TCP packets by setting nf_conntrack_tcp_be_liberal to 1--conntrack-tcp-timeout-close-wait duration Default: 1h0m0sNAT timeout for TCP connections in the CLOSE_WAIT state--conntrack-tcp-timeout-established duration Default: 24h0m0sIdle timeout for established TCP connections (0 to leave as-is)--conntrack-udp-timeout durationIdle timeout for UNREPLIED UDP connections (0 to leave as-is)--conntrack-udp-timeout-stream durationIdle timeout for ASSURED UDP connections (0 to leave as-is)--detect-local-mode LocalModeMode to use to detect local traffic. This parameter is ignored if a config file is specified by --config.--feature-gates <comma-separated 'key=True|False' pairs>A set of key=value pairs that describe feature gates for alpha/experimental features. Options are:APIResponseCompression=true|false (BETA - default=true)APIServerIdentity=true|false (BETA -


Question: What is Synopsis?

Answer: T h e   K u b e r n e t e s   n e t w o r k   p r o x y   r u n s   o n   e a c h   n o d e .   T h i s   r e f l e c t s   s e r v i c e s   a s   d e f i n e d   i n   t h e   K u b e r n e t e s   A P I   o n   e a c h   n o d e   a n d   c a n   d o   s i m p l e   T C P ,   U D P ,   a n d   S C T P   s t r e a m   f o r w a r d i n g   o r   r o u n d   r o b i n   T C P ,   U D P ,   a n d   S C T P   f o r w a r d i n g   a c r o s s   a   s e t   o f   b a c k e n d s .   S e r v i c e   c l u s t e r   I P s   a n d   p o r t s   a r e   c u r r e n t l y   f o u n d   t h r o u g h   D o c k e r - l i n k s - c o m p a t i b l e   e n v i r o n m e n t   v a r i a b l e s   s p e c i f y i n g   p o r t s   o p e n e d   b y   t h e   s e r v i c e   p r o x y .   T h e r e   i s   a n   o p t i o n a l   a d d o n   t h a t   p r o v i d e s   c l u s t e r   D N S   f o r   t h e s e   c l u s t e r   I P s .   T h e   u s e r   m u s t   c r e a t e   a   s e r v i c e   w i t h   t h e   a p i s e r v e r   A P I   t o   c o n f i g u r e   t h e   p r o x y .   k u b e - p r o x y   [ f l a g s ]


Question: What is Options?

Answer: I f   t r u e ,   a d d s   t h e   f i l e   d i r e c t o r y   t o   t h e   h e a d e r   o f   t h e   l o g   m e s s a g e s   l o g   t o   s t a n d a r d   e r r o r   a s   w e l l   a s   f i l e s   ( n o   e f f e c t   w h e n   - l o g t o s t d e r r = t r u e )   O v e r r i d e s   k u b e - p r o x y ' s   i d e a   o f   w h a t   i t s   n o d e ' s   p r i m a r y   I P   i s .   N o t e   t h a t   t h e   n a m e   i s   a   h i s t o r i c a l   a r t i f a c t ,   a n d   k u b e - p r o x y   d o e s   n o t   a c t u a l l y   b i n d   a n y   s o c k e t s   t o   t h i s   I P .   T h i s   p a r a m e t e r   i s   i g n o r e d   i f   a   c o n f i g   f i l e   i s   s p e c i f i e d   b y   - - c o n f i g .   I f   t r u e   k u b e - p r o x y   w i l l   t r e a t   f a i l u r e   t o   b i n d   t o   a   p o r t   a s   f a t a l   a n d   e x i t   I f   t r u e   c l e a n u p   i p t a b l e s   a n d   i p v s   r u l e s   a n d   e x i t .   T h e   C I D R   r a n g e   o f   t h e   p o d s   i n   t h e   c l u s t e r .   ( F o r   d u a l - s t a c k   c l u s t e r s ,   t h i s   c a n   b e   a   c o m m a - s e p a r a t e d   d u a l - s t a c k   p a i r   o f   C I D R   r a n g e s . ) .   W h e n   - - d e t e c t - l o c a l - m o d e   i s   s e t   t o   C l u s t e r C I D R ,   k u b e - p r o x y   w i l l   c o n s i d e r   t r a f f i c   t o   b e   l o c a l   i f   i t s   s o u r c e   I P   i s   i n   t h i s   r a n g e .   ( O t h e r w i s e   i t   i s   n o t   u s e d . )   T h i s   p a r a m e t e r   i s   i g n o r e d   i f   a   c o n f i g   f i l e   i s   s p e c i f i e d   b y   - - c o n f i g .   T h e   p a t h   t o   t h e   c o n f i g u r a t i o n   f i l e .   H o w   o f t e n   c o n f i g u r a t i o n   f r o m   t h e   a p i s e r v e r   i s   r e f r e s h e d .   M u s t   b e   g r e a t e r   t h a n   0 .   M a x i m u m   n u m b e r   o f   N A T


Question: What is kubectl wait?

Answer: kubectl waitSynopsisExperimental: Wait for a specific condition on one or many resources.The command takes multiple resources and waits until the specified condition is seen in the Status field of every given resource.Alternatively, the command can wait for the given set of resources to be created or deleted by providing the "create" or "delete" keyword as the value to the --for flag.A successful message will be printed to stdout indicating when the specified condition has been met. You can use -o option to change to output destination.kubectl wait ([-f FILENAME] | resource.group/resource.name | resource.group [(-l label | --all)]) [--for=create|--for=delete|--for condition=available|--for=jsonpath='{}'[=value]] Examples # Wait for the pod "busybox1" to contain the status condition of type "Ready" kubectl wait --for=condition=Ready pod/busybox1 # The default value of status condition is true; you can wait for other targets after an equal delimiter (compared after Unicode simple case folding, which is a more general form of case-insensitivity) kubectl wait --for=condition=Ready=false pod/busybox1 # Wait for the pod "busybox1" to contain the status phase to be "Running" kubectl wait --for=jsonpath='{.status.phase}'=Running pod/busybox1 # Wait for pod "busybox1" to be Ready kubectl wait --for='jsonpath={.status.conditions[?(@.type=="Ready")].status}=True' pod/busybox1 # Wait for the service "loadbalancer" to have ingress kubectl wait --for=jsonpath='{.status.loadBalancer.ingress}' service/loadbalancer # Wait for the secret "busybox1" to be created, with a timeout of 30s kubectl create secret generic busybox1 kubectl wait --for=create secret/busybox1 --timeout=30s # Wait for the pod "busybox1" to be deleted, with a timeout of 60s, after having issued the "delete" command kubectl delete pod/busybox1 kubectl wait --for=delete pod/busybox1 --timeout=60s Options--allSelect all resources in the namespace of the specified resource types-A, --all-namespacesIf present, list the requested object(s) across all namespaces. Namespace in current context is ignored even if specified with --namespace.--allow-missing-template-keys Default: trueIf true, ignore any errors in templates when a field or map key is missing in the template. Only applies to golang and jsonpath output formats.--field-selector stringSelector (field query) to filter on, supports '=', '==', and '!='.(e.g. --field-selector key1=value1,key2=value2). The server only supports a limited number of field queries per type.-f, --filename stringsidentifying the resource.--for stringThe condition to wait on: [create|delete|condition=condition-name[=condition-value]|jsonpath='{JSONPath expression}'=[JSONPath value]]. The default condition-value is true. Condition values are compared after Unicode simple case folding, which is a more general form of case-insensitivity.-h, --helphelp for wait--localIf true, annotation will NOT contact api-server but run locally.-o, --output stringOutput format. One of: (json


Question: How does kubectl wait work?

Answer: kubectl waitSynopsisExperimental: Wait for a specific condition on one or many resources.The command takes multiple resources and waits until the specified condition is seen in the Status field of every given resource.Alternatively, the command can wait for the given set of resources to be created or deleted by providing the "create" or "delete" keyword as the value to the --for flag.A successful message will be printed to stdout indicating when the specified condition has been met. You can use -o option to change to output destination.kubectl wait ([-f FILENAME] | resource.group/resource.name | resource.group [(-l label | --all)]) [--for=create|--for=delete|--for condition=available|--for=jsonpath='{}'[=value]] Examples # Wait for the pod "busybox1" to contain the status condition of type "Ready" kubectl wait --for=condition=Ready pod/busybox1 # The default value of status condition is true; you can wait for other targets after an equal delimiter (compared after Unicode simple case folding, which is a more general form of case-insensitivity) kubectl wait --for=condition=Ready=false pod/busybox1 # Wait for the pod "busybox1" to contain the status phase to be "Running" kubectl wait --for=jsonpath='{.status.phase}'=Running pod/busybox1 # Wait for pod "busybox1" to be Ready kubectl wait --for='jsonpath={.status.conditions[?(@.type=="Ready")].status}=True' pod/busybox1 # Wait for the service "loadbalancer" to have ingress kubectl wait --for=jsonpath='{.status.loadBalancer.ingress}' service/loadbalancer # Wait for the secret "busybox1" to be created, with a timeout of 30s kubectl create secret generic busybox1 kubectl wait --for=create secret/busybox1 --timeout=30s # Wait for the pod "busybox1" to be deleted, with a timeout of 60s, after having issued the "delete" command kubectl delete pod/busybox1 kubectl wait --for=delete pod/busybox1 --timeout=60s Options--allSelect all resources in the namespace of the specified resource types-A, --all-namespacesIf present, list the requested object(s) across all namespaces. Namespace in current context is ignored even if specified with --namespace.--allow-missing-template-keys Default: trueIf true, ignore any errors in templates when a field or map key is missing in the template. Only applies to golang and jsonpath output formats.--field-selector stringSelector (field query) to filter on, supports '=', '==', and '!='.(e.g. --field-selector key1=value1,key2=value2). The server only supports a limited number of field queries per type.-f, --filename stringsidentifying the resource.--for stringThe condition to wait on: [create|delete|condition=condition-name[=condition-value]|jsonpath='{JSONPath expression}'=[JSONPath value]]. The default condition-value is true. Condition values are compared after Unicode simple case folding, which is a more general form of case-insensitivity.-h, --helphelp for wait--localIf true, annotation will NOT contact api-server but run locally.-o, --output stringOutput format. One of: (json


Question: When would you use kubectl wait?

Answer: kubectl waitSynopsisExperimental: Wait for a specific condition on one or many resources.The command takes multiple resources and waits until the specified condition is seen in the Status field of every given resource.Alternatively, the command can wait for the given set of resources to be created or deleted by providing the "create" or "delete" keyword as the value to the --for flag.A successful message will be printed to stdout indicating when the specified condition has been met. You can use -o option to change to output destination.kubectl wait ([-f FILENAME] | resource.group/resource.name | resource.group [(-l label | --all)]) [--for=create|--for=delete|--for condition=available|--for=jsonpath='{}'[=value]] Examples # Wait for the pod "busybox1" to contain the status condition of type "Ready" kubectl wait --for=condition=Ready pod/busybox1 # The default value of status condition is true; you can wait for other targets after an equal delimiter (compared after Unicode simple case folding, which is a more general form of case-insensitivity) kubectl wait --for=condition=Ready=false pod/busybox1 # Wait for the pod "busybox1" to contain the status phase to be "Running" kubectl wait --for=jsonpath='{.status.phase}'=Running pod/busybox1 # Wait for pod "busybox1" to be Ready kubectl wait --for='jsonpath={.status.conditions[?(@.type=="Ready")].status}=True' pod/busybox1 # Wait for the service "loadbalancer" to have ingress kubectl wait --for=jsonpath='{.status.loadBalancer.ingress}' service/loadbalancer # Wait for the secret "busybox1" to be created, with a timeout of 30s kubectl create secret generic busybox1 kubectl wait --for=create secret/busybox1 --timeout=30s # Wait for the pod "busybox1" to be deleted, with a timeout of 60s, after having issued the "delete" command kubectl delete pod/busybox1 kubectl wait --for=delete pod/busybox1 --timeout=60s Options--allSelect all resources in the namespace of the specified resource types-A, --all-namespacesIf present, list the requested object(s) across all namespaces. Namespace in current context is ignored even if specified with --namespace.--allow-missing-template-keys Default: trueIf true, ignore any errors in templates when a field or map key is missing in the template. Only applies to golang and jsonpath output formats.--field-selector stringSelector (field query) to filter on, supports '=', '==', and '!='.(e.g. --field-selector key1=value1,key2=value2). The server only supports a limited number of field queries per type.-f, --filename stringsidentifying the resource.--for stringThe condition to wait on: [create|delete|condition=condition-name[=condition-value]|jsonpath='{JSONPath expression}'=[JSONPath value]]. The default condition-value is true. Condition values are compared after Unicode simple case folding, which is a more general form of case-insensitivity.-h, --helphelp for wait--localIf true, annotation will NOT contact api-server but run locally.-o, --output stringOutput format. One of: (json


Question: What are the benefits of kubectl wait?

Answer: kubectl waitSynopsisExperimental: Wait for a specific condition on one or many resources.The command takes multiple resources and waits until the specified condition is seen in the Status field of every given resource.Alternatively, the command can wait for the given set of resources to be created or deleted by providing the "create" or "delete" keyword as the value to the --for flag.A successful message will be printed to stdout indicating when the specified condition has been met. You can use -o option to change to output destination.kubectl wait ([-f FILENAME] | resource.group/resource.name | resource.group [(-l label | --all)]) [--for=create|--for=delete|--for condition=available|--for=jsonpath='{}'[=value]] Examples # Wait for the pod "busybox1" to contain the status condition of type "Ready" kubectl wait --for=condition=Ready pod/busybox1 # The default value of status condition is true; you can wait for other targets after an equal delimiter (compared after Unicode simple case folding, which is a more general form of case-insensitivity) kubectl wait --for=condition=Ready=false pod/busybox1 # Wait for the pod "busybox1" to contain the status phase to be "Running" kubectl wait --for=jsonpath='{.status.phase}'=Running pod/busybox1 # Wait for pod "busybox1" to be Ready kubectl wait --for='jsonpath={.status.conditions[?(@.type=="Ready")].status}=True' pod/busybox1 # Wait for the service "loadbalancer" to have ingress kubectl wait --for=jsonpath='{.status.loadBalancer.ingress}' service/loadbalancer # Wait for the secret "busybox1" to be created, with a timeout of 30s kubectl create secret generic busybox1 kubectl wait --for=create secret/busybox1 --timeout=30s # Wait for the pod "busybox1" to be deleted, with a timeout of 60s, after having issued the "delete" command kubectl delete pod/busybox1 kubectl wait --for=delete pod/busybox1 --timeout=60s Options--allSelect all resources in the namespace of the specified resource types-A, --all-namespacesIf present, list the requested object(s) across all namespaces. Namespace in current context is ignored even if specified with --namespace.--allow-missing-template-keys Default: trueIf true, ignore any errors in templates when a field or map key is missing in the template. Only applies to golang and jsonpath output formats.--field-selector stringSelector (field query) to filter on, supports '=', '==', and '!='.(e.g. --field-selector key1=value1,key2=value2). The server only supports a limited number of field queries per type.-f, --filename stringsidentifying the resource.--for stringThe condition to wait on: [create|delete|condition=condition-name[=condition-value]|jsonpath='{JSONPath expression}'=[JSONPath value]]. The default condition-value is true. Condition values are compared after Unicode simple case folding, which is a more general form of case-insensitivity.-h, --helphelp for wait--localIf true, annotation will NOT contact api-server but run locally.-o, --output stringOutput format. One of: (json


Question: What is Synopsis?

Answer: E x p e r i m e n t a l :   W a i t   f o r   a   s p e c i f i c   c o n d i t i o n   o n   o n e   o r   m a n y   r e s o u r c e s .   T h e   c o m m a n d   t a k e s   m u l t i p l e   r e s o u r c e s   a n d   w a i t s   u n t i l   t h e   s p e c i f i e d   c o n d i t i o n   i s   s e e n   i n   t h e   S t a t u s   f i e l d   o f   e v e r y   g i v e n   r e s o u r c e .   A l t e r n a t i v e l y ,   t h e   c o m m a n d   c a n   w a i t   f o r   t h e   g i v e n   s e t   o f   r e s o u r c e s   t o   b e   c r e a t e d   o r   d e l e t e d   b y   p r o v i d i n g   t h e   " c r e a t e "   o r   " d e l e t e "   k e y w o r d   a s   t h e   v a l u e   t o   t h e   - - f o r   f l a g .   A   s u c c e s s f u l   m e s s a g e   w i l l   b e   p r i n t e d   t o   s t d o u t   i n d i c a t i n g   w h e n   t h e   s p e c i f i e d   c o n d i t i o n   h a s   b e e n   m e t .   Y o u   c a n   u s e   - o   o p t i o n   t o   c h a n g e   t o   o u t p u t   d e s t i n a t i o n .   k u b e c t l   w a i t   ( [ - f   F I L E N A M E ]   |   r e s o u r c e . g r o u p / r e s o u r c e . n a m e   |   r e s o u r c e . g r o u p   [ ( - l   l a b e l   |   - - a l l ) ] )   [ - - f o r = c r e a t e | - - f o r = d e l e t e | - - f o r   c o n d i t i o n = a v a i l a b l e | - - f o r = j s o n p a t h = ' { } ' [ = v a l u e ] ]


Question: What is Examples?

Answer: #   W a i t   f o r   t h e   p o d   " b u s y b o x 1 "   t o   c o n t a i n   t h e   s t a t u s   c o n d i t i o n   o f   t y p e   " R e a d y "   k u b e c t l   w a i t   - - f o r = c o n d i t i o n = R e a d y   p o d / b u s y b o x 1   #   T h e   d e f a u l t   v a l u e   o f   s t a t u s   c o n d i t i o n   i s   t r u e ;   y o u   c a n   w a i t   f o r   o t h e r   t a r g e t s   a f t e r   a n   e q u a l   d e l i m i t e r   ( c o m p a r e d   a f t e r   U n i c o d e   s i m p l e   c a s e   f o l d i n g ,   w h i c h   i s   a   m o r e   g e n e r a l   f o r m   o f   c a s e - i n s e n s i t i v i t y )   k u b e c t l   w a i t   - - f o r = c o n d i t i o n = R e a d y = f a l s e   p o d / b u s y b o x 1   #   W a i t   f o r   t h e   p o d   " b u s y b o x 1 "   t o   c o n t a i n   t h e   s t a t u s   p h a s e   t o   b e   " R u n n i n g "   k u b e c t l   w a i t   - - f o r = j s o n p a t h = ' { . s t a t u s . p h a s e } ' = R u n n i n g   p o d / b u s y b o x 1   #   W a i t   f o r   p o d   " b u s y b o x 1 "   t o   b e   R e a d y   k u b e c t l   w a i t   - - f o r = ' j s o n p a t h = { . s t a t u s . c o n d i t i o n s [ ? ( @ . t y p e = = " R e a d y " ) ] . s t a t u s } = T r u e '   p o d / b u s y b o x 1   #   W a i t   f o r   t h e   s e r v i c e   " l o a d b a l a n c e r "   t o   h a v e   i n g r e s s   k u b e c t l   w a i t   - - f o r = j s o n p a t h = ' { . s t a t u s . l o a d B a l a n c e r . i n g r e s s } '   s e r v i c e / l o a d b a l a n c e r   #   W a i t   f o r   t h e   s e c r e t   " b u s y b o x 1 "   t o   b e   c r e a t e d ,   w i t h   a   t i m e o u t   o f   3 0 s   k u b e c t l   c r e a t e   s e c r e t   g e n e r i c   b u s y b o x 1   k u b e c t l   w a i t   - - f o r = c r e a t e   s e c r e t / b u s y b o x 1   - - t i m e o u t = 3 0 s   #   W a i t   f o r   t h e   p o d   " b u s y b o x 1 "   t o   b e   d e l e t e


Question: What is Options?

Answer: S e l e c t   a l l   r e s o u r c e s   i n   t h e   n a m e s p a c e   o f   t h e   s p e c i f i e d   r e s o u r c e   t y p e s   I f   p r e s e n t ,   l i s t   t h e   r e q u e s t e d   o b j e c t ( s )   a c r o s s   a l l   n a m e s p a c e s .   N a m e s p a c e   i n   c u r r e n t   c o n t e x t   i s   i g n o r e d   e v e n   i f   s p e c i f i e d   w i t h   - - n a m e s p a c e .   I f   t r u e ,   i g n o r e   a n y   e r r o r s   i n   t e m p l a t e s   w h e n   a   f i e l d   o r   m a p   k e y   i s   m i s s i n g   i n   t h e   t e m p l a t e .   O n l y   a p p l i e s   t o   g o l a n g   a n d   j s o n p a t h   o u t p u t   f o r m a t s .   S e l e c t o r   ( f i e l d   q u e r y )   t o   f i l t e r   o n ,   s u p p o r t s   ' = ' ,   ' = = ' ,   a n d   ' ! = ' . ( e . g .   - - f i e l d - s e l e c t o r   k e y 1 = v a l u e 1 , k e y 2 = v a l u e 2 ) .   T h e   s e r v e r   o n l y   s u p p o r t s   a   l i m i t e d   n u m b e r   o f   f i e l d   q u e r i e s   p e r   t y p e .   i d e n t i f y i n g   t h e   r e s o u r c e .   T h e   c o n d i t i o n   t o   w a i t   o n :   [ c r e a t e | d e l e t e | c o n d i t i o n = c o n d i t i o n - n a m e [ = c o n d i t i o n - v a l u e ] | j s o n p a t h = ' { J S O N P a t h   e x p r e s s i o n } ' = [ J S O N P a t h   v a l u e ] ] .   T h e   d e f a u l t   c o n d i t i o n - v a l u e   i s   t r u e .   C o n d i t i o n   v a l u e s   a r e   c o m p a r e d   a f t e r   U n i c o d e   s i m p l e   c a s e   f o l d i n g ,   w h i c h   i s   a   m o r e   g e n e r a l   f o r m   o f   c a s e - i n s e n s i t i v i t y .   h e l p   f o r   w a i t   I f   t r u e ,   a n n o t a t i o n   w i l l   N O T   c o n t a c t   a p i - s e r v e r   b u t   r u n   l o c a l l y .   O u t p u t   f o r m a t .   O n e   o f :   ( j s o n ,   y a m l ,   n a m e ,   g o - t e m p l a t e ,   g o - t e m p l a t e -


Question: What is Parent Options Inherited?

Answer: U s e r n a m e   t o   i m p e r s o n a t e   f o r   t h e   o p e r a t i o n .   U s e r   c o u l d   b e   a   r e g u l a r   u s e r   o r   a   s e r v i c e   a c c o u n t   i n   a   n a m e s p a c e .   G r o u p   t o   i m p e r s o n a t e   f o r   t h e   o p e r a t i o n ,   t h i s   f l a g   c a n   b e   r e p e a t e d   t o   s p e c i f y   m u l t i p l e   g r o u p s .   U I D   t o   i m p e r s o n a t e   f o r   t h e   o p e r a t i o n .   D e f a u l t   c a c h e   d i r e c t o r y   P a t h   t o   a   c e r t   f i l e   f o r   t h e   c e r t i f i c a t e   a u t h o r i t y   P a t h   t o   a   c l i e n t   c e r t i f i c a t e   f i l e   f o r   T L S   P a t h   t o   a   c l i e n t   k e y   f i l e   f o r   T L S   T h e   n a m e   o f   t h e   k u b e c o n f i g   c l u s t e r   t o   u s e   T h e   n a m e   o f   t h e   k u b e c o n f i g   c o n t e x t   t o   u s e   I f   t r u e ,   o p t - o u t   o f   r e s p o n s e   c o m p r e s s i o n   f o r   a l l   r e q u e s t s   t o   t h e   s e r v e r   I f   t r u e ,   t h e   s e r v e r ' s   c e r t i f i c a t e   w i l l   n o t   b e   c h e c k e d   f o r   v a l i d i t y .   T h i s   w i l l   m a k e   y o u r   H T T P S   c o n n e c t i o n s   i n s e c u r e   P a t h   t o   t h e   k u b e c o n f i g   f i l e   t o   u s e   f o r   C L I   r e q u e s t s .   P a t h   t o   t h e   k u b e r c   f i l e   t o   u s e   f o r   p r e f e r e n c e s .   T h i s   c a n   b e   d i s a b l e d   b y   e x p o r t i n g   K U B E C T L _ K U B E R C = f a l s e   f e a t u r e   g a t e   o r   t u r n i n g   o f f   t h e   f e a t u r e   K U B E R C = o f f .   R e q u i r e   s e r v e r   v e r s i o n   t o   m a t c h   c l i e n t   v e r s i o n   I f   p r e s e n t ,   t h e   n a m e s p a c e   s c o p e   f o r   t h i s   C L I   r e q u e s t   P a s s w o r d   f o r   b a s i c   a u t h e n t i c a t


Question: What is See Also?

Answer: k u b e c t l   -   k u b e c t l   c o n t r o l s   t h e   K u b e r n e t e s   c l u s t e r   m a n a g e r   T h i s   p a g e   i s   a u t o m a t i c a l l y   g e n e r a t e d .   I f   y o u   p l a n   t o   r e p o r t   a n   i s s u e   w i t h   t h i s   p a g e ,   m e n t i o n   t h a t   t h e   p a g e   i s   a u t o - g e n e r a t e d   i n   y o u r   i s s u e   d e s c r i p t i o n .   T h e   f i x   m a y   n e e d   t o   h a p p e n   e l s e w h e r e   i n   t h e   K u b e r n e t e s   p r o j e c t .


Question: What is Services, Load Balancing, and Networking?

Answer: Services, Load Balancing, and NetworkingConcepts and resources behind networking in Kubernetes.The Kubernetes network modelThe Kubernetes network model is built out of several pieces:Each pod in a cluster gets its own unique cluster-wide IP address.A pod has its own private network namespace which is shared by all of the containers within the pod. Processes running in different containers in the same pod can communicate with each other over localhost.The pod network (also called a cluster network) handles communication between pods. It ensures that (barring intentional network segmentation):All pods can communicate with all other pods, whether they are on the same node or on different nodes. Pods can communicate with each other directly, without the use of proxies or address translation (NAT).On Windows, this rule does not apply to host-network pods.Agents on a node (such as system daemons, or kubelet) can communicate with all pods on that node.The Service API lets you provide a stable (long lived) IP address or hostname for a service implemented by one or more backend pods, where the individual pods making up the service can change over time.Kubernetes automatically manages EndpointSlice objects to provide information about the pods currently backing a Service.A service proxy implementation monitors the set of Service and EndpointSlice objects, and programs the data plane to route service traffic to its backends, by using operating system or cloud provider APIs to intercept or rewrite packets.The Gateway API (or its predecessor, Ingress) allows you to make Services accessible to clients that are outside the cluster.A simpler, but less-configurable, mechanism for cluster ingress is available via the Service API's type: LoadBalancer, when using a supported Cloud Provider.NetworkPolicy is a built-in Kubernetes API that allows you to control traffic between pods, or between pods and the outside world.In older container systems, there was no automatic connectivity between containers on different hosts, and so it was often necessary to explicitly create links between containers, or to map container ports to host ports to make them reachable by containers on other hosts. This is not needed in Kubernetes; Kubernetes's model is that pods can be treated much like VMs or physical hosts from the perspectives of port allocation, naming, service discovery, load balancing, application configuration, and migration.Only a few parts of this model are implemented by Kubernetes itself. For the other parts, Kubernetes defines the APIs, but the corresponding functionality is provided by external components, some of which are optional:Pod network namespace setup is handled by system-level software implementing the Container Runtime Interface.The pod network itself is managed by a pod network implementation. On Linux, most container runtimes use the Container Networking Interface (CNI) to interact with the pod network implementation, so these implementations are often


Question: How does Services, Load Balancing, and Networking work?

Answer: Services, Load Balancing, and NetworkingConcepts and resources behind networking in Kubernetes.The Kubernetes network modelThe Kubernetes network model is built out of several pieces:Each pod in a cluster gets its own unique cluster-wide IP address.A pod has its own private network namespace which is shared by all of the containers within the pod. Processes running in different containers in the same pod can communicate with each other over localhost.The pod network (also called a cluster network) handles communication between pods. It ensures that (barring intentional network segmentation):All pods can communicate with all other pods, whether they are on the same node or on different nodes. Pods can communicate with each other directly, without the use of proxies or address translation (NAT).On Windows, this rule does not apply to host-network pods.Agents on a node (such as system daemons, or kubelet) can communicate with all pods on that node.The Service API lets you provide a stable (long lived) IP address or hostname for a service implemented by one or more backend pods, where the individual pods making up the service can change over time.Kubernetes automatically manages EndpointSlice objects to provide information about the pods currently backing a Service.A service proxy implementation monitors the set of Service and EndpointSlice objects, and programs the data plane to route service traffic to its backends, by using operating system or cloud provider APIs to intercept or rewrite packets.The Gateway API (or its predecessor, Ingress) allows you to make Services accessible to clients that are outside the cluster.A simpler, but less-configurable, mechanism for cluster ingress is available via the Service API's type: LoadBalancer, when using a supported Cloud Provider.NetworkPolicy is a built-in Kubernetes API that allows you to control traffic between pods, or between pods and the outside world.In older container systems, there was no automatic connectivity between containers on different hosts, and so it was often necessary to explicitly create links between containers, or to map container ports to host ports to make them reachable by containers on other hosts. This is not needed in Kubernetes; Kubernetes's model is that pods can be treated much like VMs or physical hosts from the perspectives of port allocation, naming, service discovery, load balancing, application configuration, and migration.Only a few parts of this model are implemented by Kubernetes itself. For the other parts, Kubernetes defines the APIs, but the corresponding functionality is provided by external components, some of which are optional:Pod network namespace setup is handled by system-level software implementing the Container Runtime Interface.The pod network itself is managed by a pod network implementation. On Linux, most container runtimes use the Container Networking Interface (CNI) to interact with the pod network implementation, so these implementations are often


Question: When would you use Services, Load Balancing, and Networking?

Answer: Services, Load Balancing, and NetworkingConcepts and resources behind networking in Kubernetes.The Kubernetes network modelThe Kubernetes network model is built out of several pieces:Each pod in a cluster gets its own unique cluster-wide IP address.A pod has its own private network namespace which is shared by all of the containers within the pod. Processes running in different containers in the same pod can communicate with each other over localhost.The pod network (also called a cluster network) handles communication between pods. It ensures that (barring intentional network segmentation):All pods can communicate with all other pods, whether they are on the same node or on different nodes. Pods can communicate with each other directly, without the use of proxies or address translation (NAT).On Windows, this rule does not apply to host-network pods.Agents on a node (such as system daemons, or kubelet) can communicate with all pods on that node.The Service API lets you provide a stable (long lived) IP address or hostname for a service implemented by one or more backend pods, where the individual pods making up the service can change over time.Kubernetes automatically manages EndpointSlice objects to provide information about the pods currently backing a Service.A service proxy implementation monitors the set of Service and EndpointSlice objects, and programs the data plane to route service traffic to its backends, by using operating system or cloud provider APIs to intercept or rewrite packets.The Gateway API (or its predecessor, Ingress) allows you to make Services accessible to clients that are outside the cluster.A simpler, but less-configurable, mechanism for cluster ingress is available via the Service API's type: LoadBalancer, when using a supported Cloud Provider.NetworkPolicy is a built-in Kubernetes API that allows you to control traffic between pods, or between pods and the outside world.In older container systems, there was no automatic connectivity between containers on different hosts, and so it was often necessary to explicitly create links between containers, or to map container ports to host ports to make them reachable by containers on other hosts. This is not needed in Kubernetes; Kubernetes's model is that pods can be treated much like VMs or physical hosts from the perspectives of port allocation, naming, service discovery, load balancing, application configuration, and migration.Only a few parts of this model are implemented by Kubernetes itself. For the other parts, Kubernetes defines the APIs, but the corresponding functionality is provided by external components, some of which are optional:Pod network namespace setup is handled by system-level software implementing the Container Runtime Interface.The pod network itself is managed by a pod network implementation. On Linux, most container runtimes use the Container Networking Interface (CNI) to interact with the pod network implementation, so these implementations are often


Question: What are the benefits of Services, Load Balancing, and Networking?

Answer: Services, Load Balancing, and NetworkingConcepts and resources behind networking in Kubernetes.The Kubernetes network modelThe Kubernetes network model is built out of several pieces:Each pod in a cluster gets its own unique cluster-wide IP address.A pod has its own private network namespace which is shared by all of the containers within the pod. Processes running in different containers in the same pod can communicate with each other over localhost.The pod network (also called a cluster network) handles communication between pods. It ensures that (barring intentional network segmentation):All pods can communicate with all other pods, whether they are on the same node or on different nodes. Pods can communicate with each other directly, without the use of proxies or address translation (NAT).On Windows, this rule does not apply to host-network pods.Agents on a node (such as system daemons, or kubelet) can communicate with all pods on that node.The Service API lets you provide a stable (long lived) IP address or hostname for a service implemented by one or more backend pods, where the individual pods making up the service can change over time.Kubernetes automatically manages EndpointSlice objects to provide information about the pods currently backing a Service.A service proxy implementation monitors the set of Service and EndpointSlice objects, and programs the data plane to route service traffic to its backends, by using operating system or cloud provider APIs to intercept or rewrite packets.The Gateway API (or its predecessor, Ingress) allows you to make Services accessible to clients that are outside the cluster.A simpler, but less-configurable, mechanism for cluster ingress is available via the Service API's type: LoadBalancer, when using a supported Cloud Provider.NetworkPolicy is a built-in Kubernetes API that allows you to control traffic between pods, or between pods and the outside world.In older container systems, there was no automatic connectivity between containers on different hosts, and so it was often necessary to explicitly create links between containers, or to map container ports to host ports to make them reachable by containers on other hosts. This is not needed in Kubernetes; Kubernetes's model is that pods can be treated much like VMs or physical hosts from the perspectives of port allocation, naming, service discovery, load balancing, application configuration, and migration.Only a few parts of this model are implemented by Kubernetes itself. For the other parts, Kubernetes defines the APIs, but the corresponding functionality is provided by external components, some of which are optional:Pod network namespace setup is handled by system-level software implementing the Container Runtime Interface.The pod network itself is managed by a pod network implementation. On Linux, most container runtimes use the Container Networking Interface (CNI) to interact with the pod network implementation, so these implementations are often


Question: What is The Kubernetes network model?

Answer: T h e   K u b e r n e t e s   n e t w o r k   m o d e l   i s   b u i l t   o u t   o f   s e v e r a l   p i e c e s :   E a c h   p o d   i n   a   c l u s t e r   g e t s   i t s   o w n   u n i q u e   c l u s t e r - w i d e   I P   a d d r e s s . A   p o d   h a s   i t s   o w n   p r i v a t e   n e t w o r k   n a m e s p a c e   w h i c h   i s   s h a r e d   b y   a l l   o f   t h e   c o n t a i n e r s   w i t h i n   t h e   p o d .   P r o c e s s e s   r u n n i n g   i n   d i f f e r e n t   c o n t a i n e r s   i n   t h e   s a m e   p o d   c a n   c o m m u n i c a t e   w i t h   e a c h   o t h e r   o v e r   l o c a l h o s t . T h e   p o d   n e t w o r k   ( a l s o   c a l l e d   a   c l u s t e r   n e t w o r k )   h a n d l e s   c o m m u n i c a t i o n   b e t w e e n   p o d s .   I t   e n s u r e s   t h a t   ( b a r r i n g   i n t e n t i o n a l   n e t w o r k   s e g m e n t a t i o n ) : A l l   p o d s   c a n   c o m m u n i c a t e   w i t h   a l l   o t h e r   p o d s ,   w h e t h e r   t h e y   a r e   o n   t h e   s a m e   n o d e   o r   o n   d i f f e r e n t   n o d e s .   P o d s   c a n   c o m m u n i c a t e   w i t h   e a c h   o t h e r   d i r e c t l y ,   w i t h o u t   t h e   u s e   o f   p r o x i e s   o r   a d d r e s s   t r a n s l a t i o n   ( N A T ) . O n   W i n d o w s ,   t h i s   r u l e   d o e s   n o t   a p p l y   t o   h o s t - n e t w o r k   p o d s . A g e n t s   o n   a   n o d e   ( s u c h   a s   s y s t e m   d a e m o n s ,   o r   k u b e l e t )   c a n   c o m m u n i c a t e   w i t h   a l l   p o d s   o n   t h a t   n o d e . T h e   S e r v i c e   A P I   l e t s   y o u   p r o v i d e   a   s t a b l e   ( l o n g   l i v e d )   I P   a d d r e s s   o r   h o s t n a m e   f o r   a   s e r v i c e   i m p l e m e n t e d   b y   o n e   o r   m o r e   b a c k e n d   p o d s ,   w h e r e   t h e   i n d i v i d u a l   p o d s   m a k i


Question: What is What's next?

Answer: T h e   C o n n e c t i n g   A p p l i c a t i o n s   w i t h   S e r v i c e s   t u t o r i a l   l e t s   y o u   l e a r n   a b o u t   S e r v i c e s   a n d   K u b e r n e t e s   n e t w o r k i n g   w i t h   a   h a n d s - o n   e x a m p l e .   C l u s t e r   N e t w o r k i n g   e x p l a i n s   h o w   t o   s e t   u p   n e t w o r k i n g   f o r   y o u r   c l u s t e r ,   a n d   a l s o   p r o v i d e s   a n   o v e r v i e w   o f   t h e   t e c h n o l o g i e s   i n v o l v e d .


Question: What is Service?

Answer: E x p o s e   a n   a p p l i c a t i o n   r u n n i n g   i n   y o u r   c l u s t e r   b e h i n d   a   s i n g l e   o u t w a r d - f a c i n g   e n d p o i n t ,   e v e n   w h e n   t h e   w o r k l o a d   i s   s p l i t   a c r o s s   m u l t i p l e   b a c k e n d s .