docker设置开机自启动，并且设置容器实例mysql等自启动

[root@qlguo ~]# systemctl enable docker

[root@qlguo ~]# docker ps -a

CONTAINER ID   IMAGE                 COMMAND                  CREATED       STATUS       PORTS                                                                                  NAMES
cbf97dab6021   mysql:5.7             "docker-entrypoint.s…"   2 weeks ago   Up 4 hours   0.0.0.0:3306->3306/tcp, :::3306->3306/tcp, 33060/tcp                                   mysql

[root@qlguo ~]# docker update cbf97dab6021 --restart=always