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, ReplicaSet, 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, ReplicaSet, Job, or DaemonSet on it.
$ kubectl drain foo --force
# As above, but abort if there are pods not managed by a ReplicationController, ReplicaSet, Job, or DaemonSet, and use a grace period of 15 minutes.
$ kubectl drain foo --grace-period=900
--delete-local-data[=false]: Continue even if there are pods using emptyDir (local data that will be deleted when the node is drained).
--force[=false]: Continue even if there are pods not managed by a ReplicationController, ReplicaSet, 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]: 同时输出日志到标准错误控制台和文件。
--certificate-authority="": 用以进行认证授权的.cert文件路径。
--client-certificate="": TLS使用的客户端证书路径。
--client-key="": TLS使用的客户端密钥路径。
--cluster="": 指定使用的kubeconfig配置文件中的集群名。
--context="": 指定使用的kubeconfig配置文件中的环境名。
--insecure-skip-tls-verify[=false]: 如果为true,将不会检查服务器凭证的有效性,这会导致你的HTTPS链接变得不安全。
--kubeconfig="": 命令行请求使用的配置文件路径。
--log-backtrace-at=:0: 当日志长度超过定义的行数时,忽略堆栈信息。
--log-dir="": 如果不为空,将日志文件写入此目录。
--log-flush-frequency=5s: 刷新日志的最大时间间隔。
--logtostderr[=true]: 输出日志到标准错误控制台,不输出到文件。
--match-server-version[=false]: 要求服务端和客户端版本匹配。
--namespace="": 如果不为空,命令将使用此namespace。
--password="": API Server进行简单认证使用的密码。
-s, --server="": Kubernetes API Server的地址和端口号。
--stderrthreshold=2: 高于此级别的日志将被输出到错误控制台。
--token="": 认证到API Server使用的令牌。
--user="": 指定使用的kubeconfig配置文件中的用户名。
--username="": API Server进行简单认证使用的用户名。
--v=0: 指定输出日志的级别。
--vmodule=: 指定输出日志的模块,格式如下:pattern=N,使用逗号分隔。