yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
对于docker-compose还需要安装（docker不需要）：
curl -L https://raw.githubusercontent.com/docker/compose/1.22.0/contrib/completion/bash/docker-compose -o /etc/bash_completion.d/docker-compose
原文：https://www.cnblogs.com/liliyang/p/9583050.html