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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. |
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| --delete-emptydir-data | |
Continue even if there are pods using emptyDir (local data that will be deleted when the node is drained). |
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| --disable-eviction | |
Force drain to use delete, even if eviction is supported. This will bypass checking PodDisruptionBudgets, use with caution. |
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| --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. |
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| --force | |
Continue even if there are pods that do not declare a controller. |
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| --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. |
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| -h, --help | |
help for drain |
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| --ignore-daemonsets | |
Ignore DaemonSet-managed pods. |
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| --pod-selector string | |
Label selector to filter pods on the node |
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| -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. |
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| --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. |
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| --timeout duration | |
The length of time to wait before giving up, zero means infinite |
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| --as string | |
Username to impersonate for the operation. User could be a regular user or a service account in a namespace. |
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| --as-group strings | |
Group to impersonate for the operation, this flag can be repeated to specify multiple groups. |
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| --as-uid string | |
UID to impersonate for the operation. |
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| --cache-dir string Default: "$HOME/.kube/cache" | |
Default cache directory |
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| --certificate-authority string | |
Path to a cert file for the certificate authority |
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| --client-certificate string | |
Path to a client certificate file for TLS |
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| --client-key string | |
Path to a client key file for TLS |
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| --cloud-provider-gce-l7lb-src-cidrs cidrs Default: 130.211.0.0/22,35.191.0.0/16 | |
CIDRs opened in GCE firewall for L7 LB traffic proxy & health checks |
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| --cloud-provider-gce-lb-src-cidrs cidrs Default: 130.211.0.0/22,209.85.152.0/22,209.85.204.0/22,35.191.0.0/16 | |
CIDRs opened in GCE firewall for L4 LB traffic proxy & health checks |
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| --cluster string | |
The name of the kubeconfig cluster to use |
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| --context string | |
The name of the kubeconfig context to use |
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| --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. |
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| --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. |
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| --disable-compression | |
If true, opt-out of response compression for all requests to the server |
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| --insecure-skip-tls-verify | |
If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure |
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| --kubeconfig string | |
Path to the kubeconfig file to use for CLI requests. |
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| --match-server-version | |
Require server version to match client version |
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| -n, --namespace string | |
If present, the namespace scope for this CLI request |
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| --password string | |
Password for basic authentication to the API server |
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| --profile string Default: "none" | |
Name of profile to capture. One of (none|cpu|heap|goroutine|threadcreate|block|mutex) |
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| --profile-output string Default: "profile.pprof" | |
Name of the file to write the profile to |
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| --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. |
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| -s, --server string | |
The address and port of the Kubernetes API server |
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| --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 |
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| --storage-driver-db string Default: "cadvisor" | |
database name |
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| --storage-driver-host string Default: "localhost:8086" | |
database host:port |
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| --storage-driver-password string Default: "root" | |
database password |
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| --storage-driver-secure | |
use secure connection with database |
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| --storage-driver-table string Default: "stats" | |
table name |
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| --storage-driver-user string Default: "root" | |
database username |
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| --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 |
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| --token string | |
Bearer token for authentication to the API server |
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| --user string | |
The name of the kubeconfig user to use |
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| --username string | |
Username for basic authentication to the API server |
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| --version version[=true] | |
--version, --version=raw prints version information and quits; --version=vX.Y.Z... sets the reported version |
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| --warnings-as-errors | |
Treat warnings received from the server as errors and exit with a non-zero exit code |
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See Also
- kubectl - kubectl controls the Kubernetes cluster manager
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