[root@localhost ~]# vi /etc/sysctl.conf
vm.max_map_count=262144
[root@localhost ~]# sysctl -p
[root@localhost ~]# yum install -y bash-completion
[root@localhost ~]# source /usr/share/bash-completion/completions/docker
[root@localhost ~]# source /usr/share/bash-completion/bash_completion