yum install bash-completion
curl -L https://raw.githubusercontent.com/docker/cli/master/contrib/completion/bash/docker -o /etc/bash_completion.d/docker
source /etc/bash_completion.d/docker
在每次启动终端时都自动加载补全，你可以将补全命令添加到你的 .bashrc 文件中
echo "source /etc/bash_completion.d/docker" >> ~/.bashrc
source ~/.bashrc