kubectl drain

Synopsis

Drain node in preparation for maintenance.

The given node will be marked unschedulable to prevent new pods from arriving. 'drain' evicts the pods if the API server supports https://kubernetes.io/docs/concepts/workloads/pods/disruptions/ eviction https://kubernetes.io/docs/concepts/workloads/pods/disruptions/ . Otherwise, it will use normal DELETE to delete the pods. The 'drain' evicts or deletes all pods except mirror pods (which cannot be deleted through the API server). If there are daemon set-managed pods, drain will not proceed without --ignore-daemonsets, and regardless it will not delete any daemon set-managed pods, because those pods would be immediately replaced by the daemon set controller, which ignores unschedulable markings. If there are any pods that are neither mirror pods nor managed by a replication controller, replica set, daemon set, stateful set, or job, then drain will not delete any pods unless you use --force. --force will also allow deletion to proceed if the managing resource of one or more pods is missing.

'drain' waits for graceful termination. You should not operate on the machine until the command completes.

When you are ready to put the node back into service, use kubectl uncordon, which will make the node schedulable again.

https://kubernetes.io/images/docs/kubectl_drain.svg Workflowhttps://kubernetes.io/images/docs/kubectl_drain.svg

kubectl drain NODE

Examples

  # Drain node "foo", even if there are pods not managed by a replication controller, replica set, job, daemon set, or stateful set on it
  kubectl drain foo --force
  
  # As above, but abort if there are pods not managed by a replication controller, replica set, job, daemon set, or stateful set, and use a grace period of 15 minutes
  kubectl drain foo --grace-period=900

Options

--chunk-size int Default: 500
	Return large lists in chunks rather than all at once. Pass 0 to disable. This flag is beta and may change in the future.
--delete-emptydir-data
	Continue even if there are pods using emptyDir (local data that will be deleted when the node is drained).
--disable-eviction
	Force drain to use delete, even if eviction is supported. This will bypass checking PodDisruptionBudgets, use with caution.
--dry-run string[="unchanged"] Default: "none"
	Must be "none", "server", or "client". If client strategy, only print the object that would be sent, without sending it. If server strategy, submit server-side request without persisting the resource.
--force
	Continue even if there are pods that do not declare a controller.
--grace-period int Default: -1
	Period of time in seconds given to each pod to terminate gracefully. If negative, the default value specified in the pod will be used.
-h, --help
	help for drain
--ignore-daemonsets
	Ignore DaemonSet-managed pods.
--pod-selector string
	Label selector to filter pods on the node
-l, --selector string
	Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2). Matching objects must satisfy all of the specified label constraints.
--skip-wait-for-delete-timeout int
	If pod DeletionTimestamp older than N seconds, skip waiting for the pod. Seconds must be greater than 0 to skip.
--timeout duration
	The length of time to wait before giving up, zero means infinite

Options inherited from parent commands

--as string
	Username to impersonate for the operation. User could be a regular user or a service account in a namespace.
--as-group strings
	Group to impersonate for the operation, this flag can be repeated to specify multiple groups.
--as-uid string
	UID to impersonate for the operation.
--cache-dir string Default: "$HOME/.kube/cache"
	Default cache directory
--certificate-authority string
	Path to a cert file for the certificate authority
--client-certificate string
	Path to a client certificate file for TLS
--client-key string
	Path to a client key file for TLS
--cluster string
	The name of the kubeconfig cluster to use
--context string
	The name of the kubeconfig context to use
--default-not-ready-toleration-seconds int Default: 300
	Indicates the tolerationSeconds of the toleration for notReady:NoExecute that is added by default to every pod that does not already have such a toleration.
--default-unreachable-toleration-seconds int Default: 300
	Indicates the tolerationSeconds of the toleration for unreachable:NoExecute that is added by default to every pod that does not already have such a toleration.
--disable-compression
	If true, opt-out of response compression for all requests to the server
--insecure-skip-tls-verify
	If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
--kubeconfig string
	Path to the kubeconfig file to use for CLI requests.
--match-server-version
	Require server version to match client version
-n, --namespace string
	If present, the namespace scope for this CLI request
--password string
	Password for basic authentication to the API server
--profile string Default: "none"
	Name of profile to capture. One of (none\|cpu\|heap\|goroutine\|threadcreate\|block\|mutex)
--profile-output string Default: "profile.pprof"
	Name of the file to write the profile to
--request-timeout string Default: "0"
	The length of time to wait before giving up on a single server request. Non-zero values should contain a corresponding time unit (e.g. 1s, 2m, 3h). A value of zero means don't timeout requests.
-s, --server string
	The address and port of the Kubernetes API server
--storage-driver-buffer-duration duration Default: 1m0s
	Writes in the storage driver will be buffered for this duration, and committed to the non memory backends as a single transaction
--storage-driver-db string Default: "cadvisor"
	database name
--storage-driver-host string Default: "localhost:8086"
	database host:port
--storage-driver-password string Default: "root"
	database password
--storage-driver-secure
	use secure connection with database
--storage-driver-table string Default: "stats"
	table name
--storage-driver-user string Default: "root"
	database username
--tls-server-name string
	Server name to use for server certificate validation. If it is not provided, the hostname used to contact the server is used
--token string
	Bearer token for authentication to the API server
--user string
	The name of the kubeconfig user to use
--username string
	Username for basic authentication to the API server
--version version[=true]
	--version, --version=raw prints version information and quits; --version=vX.Y.Z... sets the reported version
--warnings-as-errors
	Treat warnings received from the server as errors and exit with a non-zero exit code