kubectl学习笔记

linuxcmd 2021-07-19

220

kubectl是管理kubernetes的轻量级工具，可以极大提高管理效率。

别名和自动补全,编辑 bashrc或者zshrc

$vim ~./bashrc
alias k="kubectl"
complete -F __start_kubectl k
$vim ~./zshrc
alias k="kubectl"
complete -F __start_kubectl k

kubectl
的帮助文档使用方便，如果命令使用方法不清楚，可以直接输入k <command> --help

$k label -h
----------------------------
Examples:
  # Update pod 'foo' with the label 'unhealthy' and the value 'true'.
  kubectl label pods foo unhealthy=true


  # Update pod 'foo' with the label 'status' and the value 'unhealthy', overwriting any existing value.
  kubectl label --overwrite pods foo status=unhealthy


  # Update all pods in the namespace
  kubectl label pods --all status=unhealthy


  # Update a pod identified by the type and name in "pod.json"
  kubectl label -f pod.json status=unhealthy


  # Update pod 'foo' only if the resource is unchanged from version 1.
  kubectl label pods foo status=unhealthy --resource-version=1


  # Update pod 'foo' by removing a label named 'bar' if it exists.
  # Does not require the --overwrite flag.
  kubectl label pods foo bar-

查看系统资源的基本命令

$ k get pods
$ k get nodes
$ k get services


# You can sort too
$ k get pods --sort-by=.status.startTime


# Get with a label selector
$ k get pods -l app=kombucha-service


# Watch over time
$ k get pods -l app=kombucha-service --watch


# View the events
$ k get events


# Describe the pod
$ k describe pod <pod-name>


$ k api-resources

系统调试与故障排查

# Follow the logs of a pod
$ k logs -f <pod-name> -c <container-name>


# For only the tail, use `--tail=n`
$ k logs <pod-name> -c <container-name> --tail=50


# Multiple pods at once
$ k logs -l foo=bar

数据库

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kubectl学习笔记

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