[root@docker ~]# systemctl start docker

[root@docker ~]# docker images
REPOSITORY  TAG   IMAGE ID  CREATED  SIZE
centos/mysql-57-centos7 latest  2e4ddfafaa6f 6 months ago 445MB
gogs/gogs   latest  2fb3b88053d6 6 months ago 94.2MB

[root@docker ~]# docker search mysql
NAME             DESCRIPTION          STARS    OFFICIAL   AUTOMATED
mysql             MySQL is a widely used, open-source relation… 7854    [OK]    
mariadb            MariaDB is a community-developed fork of MyS… 2604    [OK]    
cloudfoundry/cf-mysql-ci        Image used in CI of cf-mysql-release   0 
[root@localhost ~]# docker pull mysql ---------------------默认下载最新版本
[root@localhost ~]# docker pull mysql:5.7--------------------下载指定版本   

[root@docker ~]# docker run -di --name=test_mysql -p 3306:3306 -e MYSQL_ROOT_PASSWORD=root centos/mysql-57-centos7
d7e5f99b502a904a970026e90227e186107e3b5d0baeaa93491af12cd7317b99
run : 创建并运行
-di : 以守护者模式创建
--name : 给容器取个名字
-p : 端口映射
-e : 初始化Mysql用户，并将root密码设置为root

[root@docker ~]# docker ps
CONTAINER ID  IMAGE      COMMAND     CREATED    STATUS    PORTS     NAMES
d7e5f99b502a  centos/mysql-57-centos7 "container-entrypoin…" 5 seconds ago  Up 4 seconds  0.0.0.0:3306->3306/tcp test_mysql