安装bash-completion

yum install bash-completion -y

添加至环境变量

vim /etc/bashrc
#追加如下内容
if [ -f /etc/bash_completion ]; then
        . /etc/bash_completion
fi

读取/etc/bash or　退出当前shell重新登陆

source /etc/bashrc

测试可用性

kubectl <按两下tab> 可以看到改命令可接的参数

[root@centos7-2 ~]# kubectl 
api-versions    create          exec            label           patch           replace         scale           
cluster-info    delete          expose          logs            port-forward    rolling-update  stop            
config          describe        get             namespace       proxy           run             version