k8s学习-kubectl命令常用选项详解与实战

• 概述
• • 语法
  • 资源类型
  • 输出选项
• 实战
• • 基本命令
  • • create
    • get
    • edit
    • delete
  • 集群管理
  • • cluster-info
    • top
    • cordon && uncordon
    • drain
    • taint
  • 高级命令
  • • apply
    • replace
  • 故障诊断和调试
  • • describe
    • logs
    • exec
  • 设置命令
  • • label
  • 其他命令
  • • version
• 参考

kubectl [command] [TYPE] [NAME] [flags]

• command: 指定要对资源执行的操作，例如，create、get、describe和delete
• type: 指定资源类型，资源类型不区分大小写， 可以指定单数、复数或缩写形式。
• name：指定资源的名称，名称区分大小写。 如果省略名称，则显示所有资源的详细信息。
• flags：指定可选的参数。例如，可用-s 或者–server 参数指定 Kubernetes API server 的地址和端口。

-h查看所有命令

kubectl controls the Kubernetes cluster manager.

 Find more information at: https://kubernetes.io/docs/reference/kubectl/overview/

Basic Commands (Beginner):
  create         Create a resource from a file or from stdin.
  expose         Take a replication controller, service, deployment or pod and expose it as a new Kubernetes Service
  run            Run a particular image on the cluster
  set            Set specific features on objects

Basic Commands (Intermediate):
  explain        Documentation of resources
  get            Display one or many resources
  edit           Edit a resource on the server
  delete         Delete resources by filenames, stdin, resources and names, or by resources and label selector

Deploy Commands:
  rollout        Manage the rollout of a resource
  scale          Set a new size for a Deployment, ReplicaSet or Replication Controller
  autoscale      Auto-scale a Deployment, ReplicaSet, or ReplicationController

Cluster Management Commands:
  certificate    Modify certificate resources.
  cluster-info   Display cluster info
  top            Display Resource (CPU/Memory/Storage) usage.
  cordon         Mark node as unschedulable
  uncordon       Mark node as schedulable
  drain          Drain node in preparation for maintenance
  taint          Update the taints on one or more nodes

Troubleshooting and Debugging Commands:
  describe       Show details of a specific resource or group of resources
  logs           Print the logs for a container in a pod
  attach         Attach to a running container
  exec           Execute a command in a container
  port-forward   Forward one or more local ports to a pod
  proxy          Run a proxy to the Kubernetes API server
  cp             Copy files and directories to and from containers.
  auth           Inspect authorization

Advanced Commands:
  diff           Diff live version against would-be applied version
  apply          Apply a configuration to a resource by filename or stdin
  patch          Update field(s) of a resource using strategic merge patch
  replace        Replace a resource by filename or stdin
  wait           Experimental: Wait for a specific condition on one or many resources.
  convert        Convert config files between different API versions
  kustomize      Build a kustomization target from a directory or a remote url.

Settings Commands:
  label          Update the labels on a resource
  annotate       Update the annotations on a resource
  completion     Output shell completion code for the specified shell (bash or zsh)

Other Commands:
  api-resources  Print the supported API resources on the server
  api-versions   Print the supported API versions on the server, in the form of "group/version"
  config         Modify kubeconfig files
  plugin         Provides utilities for interacting with plugins.
  version        Print the client and server version information

Usage:
  kubectl [flags] [options]

Use "kubectl  --help" for more information about a given command.
Use "kubectl options" for a list of global command-line options (applies to all commands).

之后实战的分类，就大致按照帮助命令的分类进行展示了。
再看下选项

The following options can be passed to any command:
      --add-dir-header=false: If true, adds the file directory to the header
      --alsologtostderr=false: log to standard error as well as files
      --as='': Username to impersonate for the operation
      --as-group=[]: Group to impersonate for the operation, this flag can be repeated to specify multiple groups.
      --cache-dir='/root/.kube/http-cache': Default HTTP 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
      --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-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
      --match-server-version=false: Require server version to match client version
  -n, --namespace='': If present, the namespace scope for this CLI request
      --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
      --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
      --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, --v=0: number for the log level verbosity
      --vmodule=: comma-separated list of pattern=N settings for file-filtered logging

经常用的是–cluster指定集群，-n指定命名空间

kubectl api-resources

资源名的缩写大家还是要记一下，之后的文章敲命令我也会多用缩写。常用的有：

• cm：ConfigMap
• ns：NameSpace
• no：Node
• pvc：PersistentVolumeClaim
• pv：PersistentVolume
• po：Pod
• rc：ReplicationController
• sa：ServiceAccount
• svc：Service
• ds：DaemonSet
• deploy：Deployment
• rs：ReplicaSet
• sts：StatefulSet
• cj：CronJob

kubectl [command] [TYPE] [NAME] -o=