Drain node in preparation for maintenance
Drain node in preparation for maintenance.
The given node will be marked unschedulable to prevent new pods from arriving. Then drain deletes all pods except mirror pods (which cannot be deleted through the API server). If there are DaemonSet-managed pods, drain will not proceed without –ignore-daemonsets, and regardless it will not delete any DaemonSet-managed pods, because those pods would be immediately replaced by the DaemonSet controller, which ignores unschedulable markings. If there are any pods that are neither mirror pods nor managed–by ReplicationController, DaemonSet or Job–, then drain will not delete any pods unless you use –force.
When you are ready to put the node back into service, use kubectl uncordon, which will make the node schedulable again.
kubectl drain NODE
# Drain node "foo", even if there are pods not managed by a ReplicationController, Job, or DaemonSet on it. $ kubectl drain foo --force # As above, but abort if there are pods not managed by a ReplicationController, Job, or DaemonSet, and use a grace period of 15 minutes. $ kubectl drain foo --grace-period=900
--force[=false]: Continue even if there are pods not managed by a ReplicationController, Job, or DaemonSet. --grace-period=-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. --ignore-daemonsets[=false]: Ignore DaemonSet-managed pods.
--alsologtostderr[=false]: log to standard error as well as files --certificate-authority="": Path to a cert. file for the certificate authority. --client-certificate="": Path to a client certificate file for TLS. --client-key="": Path to a client key file for TLS. --cluster="": The name of the kubeconfig cluster to use --context="": The name of the kubeconfig context to use --insecure-skip-tls-verify[=false]: If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure. --kubeconfig="": Path to the kubeconfig file to use for CLI requests. --log-backtrace-at=:0: when logging hits line file:N, emit a stack trace --log-dir="": If non-empty, write log files in this directory --log-flush-frequency=5s: Maximum number of seconds between log flushes --logtostderr[=true]: log to standard error instead of files --match-server-version[=false]: Require server version to match client version --namespace="": If present, the namespace scope for this CLI request. --password="": Password for basic authentication to the API server. -s, --server="": The address and port of the Kubernetes API server --stderrthreshold=2: logs at or above this threshold go to stderr --token="": Bearer token for authentication to the API server. --user="": The name of the kubeconfig user to use --username="": Username for basic authentication to the API server. --v=0: log level for V logs --vmodule=: comma-separated list of pattern=N settings for file-filtered logging