Kubernetes:基于终端UI的管理工具 K9s

我所渴求的，無非是將心中脫穎語出的本性付諸生活，為何竟如此艱難呢 ——赫尔曼·黑塞《德米安》

写在前面

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• K9s 是一个基于终端UI的 K8S 管理工具
• 博文内容为 k9s 在 windows、Linux 以及docker 安装Demo
• 简单的 热键使用。
• 理解不足小伙伴帮忙指正

我所渴求的，無非是將心中脫穎語出的本性付諸生活，為何竟如此艱難呢 ——赫尔曼·黑塞《德米安》

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K9s 是一个基于终端的管理 Kubernetes 集群的工具，旨在简化 Kubernetes 集群管理。和 kubebox 有些类似， K9s 同样可以持续监控集群的变化，并且可以提供与集群资源交互的快捷命令。如果说管理集群受限，只有一个 终端你可以使用，那么 k9s 是一个不错的选择.

K9s 有一些特殊功能，可以显示 Kubernetes 资源之间依赖关系的 xray、显示集群高级状态的 pulse，以及扫描和报告已部署资源和配置问题的popeye 。

安装下载

window 客户端安装

PS C:\Program Files> choco install k9s
Chocolatey v1.1.0
Installing the following packages:
k9s
By installing, you accept licenses for the packages.
Progress: Downloading kubernetes-cli 1.26.0... 100%
Progress: Downloading k9s 0.26.7... 100%

kubernetes-cli v1.26.0 [Approved]
kubernetes-cli package files install completed. Performing other installation steps.
The package kubernetes-cli wants to run 'chocolateyInstall.ps1'.
Note: If you don't run this script, the installation will fail.
Note: To confirm automatically next time, use '-y' or consider:
choco feature enable -n allowGlobalConfirmation
Do you want to run the script?([Y]es/[A]ll - yes to all/[N]o/[P]rint): all

Extracting 64-bit C:\ProgramData\chocolatey\lib\kubernetes-cli\tools\kubernetes-client-windows-amd64.tar.gz to C:\ProgramData\chocolatey\lib\kubernetes-cli\tools...
C:\ProgramData\chocolatey\lib\kubernetes-cli\tools
Extracting 64-bit C:\ProgramData\chocolatey\lib\kubernetes-cli\tools\kubernetes-client-windows-amd64.tar to C:\ProgramData\chocolatey\lib\kubernetes-cli\tools...
C:\ProgramData\chocolatey\lib\kubernetes-cli\tools
 ShimGen has successfully created a shim for kubectl-convert.exe
 ShimGen has successfully created a shim for kubectl.exe
 The install of kubernetes-cli was successful.
  Software installed to 'C:\ProgramData\chocolatey\lib\kubernetes-cli\tools'

k9s v0.26.7 [Approved]
k9s package files install completed. Performing other installation steps.
Extracting 64-bit C:\ProgramData\chocolatey\lib\k9s\tools\k9s_Windows_x86_64.tar.gz to C:\ProgramData\chocolatey\lib\k9s\tools...
C:\ProgramData\chocolatey\lib\k9s\tools
Extracting 64-bit C:\ProgramData\chocolatey\lib\k9s\tools\k9s_Windows_x86_64.tar to C:\ProgramData\chocolatey\lib\k9s\tools...
C:\ProgramData\chocolatey\lib\k9s\tools
 ShimGen has successfully created a shim for k9s.exe
 The install of k9s was successful.
  Software installed to 'C:\ProgramData\chocolatey\lib\k9s\tools'

Chocolatey installed 2/2 packages.
 See the log for details (C:\ProgramData\chocolatey\logs\chocolatey.log).
PS C:\Program Files>

下载之后，需要准备好 kubeconfig 文件，放到默认加载的位置

PS C:\Users\山河已无恙\.kube> ls


    目录: C:\Users\山河已无恙\.kube


Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d-----         2023/1/14      7:48                cache
-a----         2023/1/14     10:19           5682 config
PS C:\Users\山河已无恙\.kube> cat .\config
apiVersion: v1
clusters:
- cluster:
    certificate-authority-data:
    .......................

通过命令行启动

PS C:\ProgramData\chocolatey\lib\k9s\tools> .\k9s.exe

Linux 客户端安装

下载安装包

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k9s]
└─$curl -sS https://webinstall.dev/k9s | bash

Thanks for using webi to install 'k9s@stable' on 'Linux/x86_64'.
Have a problem? Experience a bug? Please let us know:
        https://github.com/webinstall/webi-installers/issues

Lovin' it? Say thanks with a Star on GitHub:
        https://github.com/webinstall/webi-installers

Downloading k9s from
https://github.com/derailed/k9s/releases/download/v0.26.7/k9s_Linux_x86_64.tar.gz
failed to download from https://github.com/derailed/k9s/releases/download/v0.26.7/k9s_Linux_x86_64.tar.gz

解压直接运行

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k9s]
└─$tar -zxvf k9s_Linux_x86_64.tar.gz
LICENSE
README.md
k9s
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k9s]
└─$ls
k9s  k9s_Linux_x86_64.tar.gz  LICENSE  README.md
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k9s]
└─$./k9s

查看当前集群资源的统计信息。

docker 安装

也可以通过docker 直接运行

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k9s]
└─$docker run --rm -it -v ~/.kube/config:/root/.kube/config docker.io/derailed/k9s

查看资源状态信息

查看资源依赖关系

热键

Action	Command	Comment
Show active keyboard mnemonics and help	?
Show all available resource alias	ctrl-a
To bail out of K9s	:q, ctrl-c
View a Kubernetes resource using singular/plural or short-name	:po⏎	accepts singular, plural, short-name or alias ie pod or pods
View a Kubernetes resource in a given namespace	:alias namespace⏎
Filter out a resource view given a filter	/filter⏎	Regex2 supported ie `fred
Inverse regex filter	/! filter⏎	Keep everything that doesn't match.
Filter resource view by labels	/-l label-selector⏎
Fuzzy find a resource given a filter	/-f filter⏎
Bails out of view/command/filter mode	<esc>
Key mapping to describe, view, edit, view logs,...	d,v, e, l,...
To view and switch to another Kubernetes context	:ctx⏎
To view and switch to another Kubernetes context	:ctx context-name⏎
To view and switch to another Kubernetes namespace	:ns⏎
To view all saved resources	:screendump or sd⏎
To delete a resource (TAB and ENTER to confirm)	ctrl-d
To kill a resource (no confirmation dialog!)	ctrl-k
Launch pulses view	:pulses or pu⏎
Launch XRay view	:xray RESOURCE [NAMESPACE]⏎	RESOURCE can be one of po, svc, dp, rs, sts, ds, NAMESPACE is optional
Launch Popeye view	:popeye or pop⏎	See popeye

博文参考

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https://github.com/derailed/k9s

https://k9scli.io/