Eric Paris Jan 2015
kubectl drain [Options]
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 APIServer supports http://kubernetes.io/docs/admin/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 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, ReplicaSet, DaemonSet, StatefulSet 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.
--delete-emptydir-data=false Continue even if there are pods using emptyDir (local data that will be deleted when the node is drained).
--delete-local-data=false Continue even if there are pods using emptyDir (local data that will be deleted when the node is drained).
--disable-eviction=false Force drain to use delete, even if eviction is supported. This will bypass checking PodDisruptionBudgets, use with caution.
--dry-run="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=false Continue even if there are pods not managed by a ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet.
--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.
--ignore-errors=false Ignore errors occurred between drain nodes in group.
--pod-selector="" Label selector to filter pods on the node
-l, --selector="" Selector (label query) to filter on
--skip-wait-for-delete-timeout=0 If pod DeletionTimestamp older than N seconds, skip waiting for the pod. Seconds must be greater than 0 to skip.
--timeout=0s The length of time to wait before giving up, zero means infinite
Options Inherited from Parent Commands
--add-dir-header=false If true, adds the file directory to the header of the log messages
--alsologtostderr=false log to standard error as well as files
--application-metrics-count-limit=100 Max number of application metrics to store (per container)
--as="" Username to impersonate for the operation
--as-group= Group to impersonate for the operation, this flag can be repeated to specify multiple groups.
--azure-container-registry-config="" Path to the file containing Azure container registry configuration information.
--boot-id-file="/proc/sys/kernel/random/boot_id" Comma-separated list of files to check for boot-id. Use the first one that exists.
--cache-dir="/builddir/.kube/cache" Default cache directory
--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
--cloud-provider-gce-l7lb-src-cidrs=220.127.116.11/22,18.104.22.168/16 CIDRs opened in GCE firewall for L7 LB traffic proxy health checks
--cloud-provider-gce-lb-src-cidrs=22.214.171.124/22,126.96.36.199/22,188.8.131.52/22,184.108.40.206/16 CIDRs opened in GCE firewall for L4 LB traffic proxy health checks
--cluster="" The name of the kubeconfig cluster to use
--container-hints="/etc/cadvisor/container_hints.json" location of the container hints file
--containerd="/run/containerd/containerd.sock" containerd endpoint
--containerd-namespace="k8s.io" containerd namespace
--context="" The name of the kubeconfig context to use
--default-not-ready-toleration-seconds=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=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-root-cgroup-stats=false Disable collecting root Cgroup stats
--docker="unix:///var/run/docker.sock" docker endpoint
--docker-env-metadata-whitelist="" a comma-separated list of environment variable keys matched with specified prefix that needs to be collected for docker containers
--docker-only=false Only report docker containers in addition to root stats
--docker-root="/var/lib/docker" DEPRECATED: docker root is read from docker info (this is a fallback, default: /var/lib/docker)
--docker-tls=false use TLS to connect to docker
--docker-tls-ca="ca.pem" path to trusted CA
--docker-tls-cert="cert.pem" path to client certificate
--docker-tls-key="key.pem" path to private key
--enable-load-reader=false Whether to enable cpu load reader
--event-storage-age-limit="default=0" Max length of time for which to store events (per type). Value is a comma separated list of key values, where the keys are event types (e.g.: creation, oom) or "default" and the value is a duration. Default is applied to all non-specified event types
--event-storage-event-limit="default=0" Max number of events to store (per type). Value is a comma separated list of key values, where the keys are event types (e.g.: creation, oom) or "default" and the value is an integer. Default is applied to all non-specified event types
--global-housekeeping-interval=1m0s Interval between global housekeepings
--housekeeping-interval=10s Interval between container housekeepings
--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-cadvisor-usage=false Whether to log the usage of the cAdvisor container
--log-dir="" If non-empty, write log files in this directory
--log-file="" If non-empty, use this log file
--log-file-max-size=1800 Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited.
--log-flush-frequency=5s Maximum number of seconds between log flushes
--logtostderr=true log to standard error instead of files
--machine-id-file="/etc/machine-id,/var/lib/dbus/machine-id" Comma-separated list of files to check for machine-id. Use the first one that exists.
--match-server-version=false Require server version to match client version
-n, --namespace="" If present, the namespace scope for this CLI request
--one-output=false If true, only write logs to their native severity level (vs also writing to each lower severity level)
--password="" Password for basic authentication to the API server
--profile="none" Name of profile to capture. One of (none|cpu|heap|goroutine|threadcreate|block|mutex)
--profile-output="profile.pprof" Name of the file to write the profile to
--referenced-reset-interval=0 Reset interval for referenced bytes (container_referenced_bytes metric), number of measurement cycles after which referenced bytes are cleared, if set to 0 referenced bytes are never cleared (default: 0)
--request-timeout="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="" The address and port of the Kubernetes API server
--skip-headers=false If true, avoid header prefixes in the log messages
--skip-log-headers=false If true, avoid headers when opening log files
--stderrthreshold=2 logs at or above this threshold go to stderr
--storage-driver-buffer-duration=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="cadvisor" database name
--storage-driver-host="localhost:8086" database host:port
--storage-driver-password="root" database password
--storage-driver-secure=false use secure connection with database
--storage-driver-table="stats" table name
--storage-driver-user="root" database username
--tls-server-name="" Server name to use for server certificate validation. If it is not provided, the hostname used to contact the server is used
--token="" Bearer token for authentication to the API server
--update-machine-info-interval=5m0s Interval between machine info updates.
--user="" The name of the kubeconfig user to use
--username="" Username for basic authentication to the API server
-v, --v=0 number for the log level verbosity
--version=false Print version information and quit
--vmodule= comma-separated list of pattern=N settings for file-filtered logging
--warnings-as-errors=false Treat warnings received from the server as errors and exit with a non-zero exit code
# Drain node "foo", even if there are pods not managed by a ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet on it. $ kubectl drain foo --force # As above, but abort if there are pods not managed by a ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet, and use a grace period of 15 minutes. $ kubectl drain foo --grace-period=900
January 2015, Originally compiled by Eric Paris (eparis at redhat dot com) based on the kubernetes source material, but hopefully they have been automatically generated since!