前言

发现在集群的master上执行kubectl可以自动补全，而在远程server通过指定kubeconfig时无法实现自动补全。

应该是安装集群时，相关剧本已经将自动补全给实现了。下面探索下如何进行手动配置。

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安装kubectl

kubernetes.io/docs/tasks…

进入官网，选择对应版本下载。

 ansible  @ops-2701 /tmp$ curl -LO https://dl.k8s.io/release/v1.22.16/bin/linux/amd64/kubectl
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   138  100   138    0     0    138      0  0:00:01 --:--:--  0:00:01   607
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.
HTTPS-proxy has similar options --proxy-cacert and --proxy-insecure.

 60   ansible  @ops-2701 /tmp$ curl -LO https://dl.k8s.io/release/v1.22.16/bin/linux/amd64/kubectl -k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   138  100   138    0     0    138      0  0:00:01 --:--:--  0:00:01   607
100 44.7M  100 44.7M    0     0   935k      0  0:00:49  0:00:49 --:--:-- 1178k

可以看到，官方文档提供的文件链接ssl证书过期了，加上-k​参数忽略ssl校验。

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校验版本，结果符合预期

ansible  @ops-2701 /tmp$ chmod +x kubectl 

ansible  @ops-2701 /tmp$ ./kubectl version
Client Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.16", GitCommit:"b28e1f370a4a4c428ddbeababcaf0198f048fcac", GitTreeState:"clean", BuildDate:"2022-11-09T13:37:37Z", GoVersion:"go1.16.15", Compiler:"gc", Platform:"linux/amd64"}

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移动至环境变量目录

ansible  @ops-2701 /tmp$ sudo mv kubectl /bin/kubectl

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配置自动补全

安装​bash-completion​

Ubuntu 和 CentOS都可以用默认的包管理源进行安装

# Ubuntu
apt-get update
apt-get install bash-completion -y

# CentOS
yum install bash-completion -y 

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查看当前completion​存在的配置

# ls /etc/bash_completion.d/
git  iprutils  redefine_filedir  scl.bash  yum-utils.bash

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增加kubectl配置到completion​配置目录中

 kubectl completion bash > /etc/bash_completion.d/kubectl

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重新登录 ssh 会话即可生效自动补齐

引用链接

• kubernetes.io/docs/tasks...