yum install MariaDB-server MariaDB-client
提示：mysql-server-5.1.73-8.el6_8.x86_64 was supposed to be removed but is not!
因为安装操作系统的时候，mysql也一块安装了，但安装MariaDB并不能卸载此前安装的mysql，导致MariaDB安装失败。
1、首先查找出安装的mysql包
[root@centos6 ~]# rpm -qa | grep -i ‘^mysql-‘
mysql-server-5.1.73-8.el6_8.x86_64
2、如果mysql在开启，首先关闭
[root@centos6 ~]# /etc/init.d/mysqld stop
Stopping mysqld: [ OK ]
3、卸载安装的mysql包
[root@centos6 ~]# rpm --nodeps -ev mysql-server-5.1.73-8.el6_8.x86_64
4、查看是否卸载了mysql
[root@centos6 ~]# rpm -qa | grep -i ‘^mysql-‘
没有显示即没有和mysql相关的包，已经卸载。
5、重新执行MariaDB安装
yum install MariaDB-server MariaDB-client
6、查看安装MariaDB生成的文件
[root@centos6 ~]# rpm -ql MariaDB-server
/etc/init.d/mysql
/etc/logrotate.d/mysql
/etc/my.cnf.d
/etc/my.cnf.d/server.cnf
....
7、启动服务
[root@centos6 ~]# /etc/init.d/mysql start
Starting MySQL.180120 16:22:20 mysqld_safe Logging to ‘/var/lib/mysql/centos6_103.sunan.err‘.
180120 16:22:20 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
... [ OK ]
[root@centos6 ~]# ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 50 *:3306 *:*
LISTEN 0 128 *:57007 *:*
LISTEN 0 128 :::111 :::*
看到3306端口已经开启
8、查看安装的版本
[root@centos6 ~]# mysql --version
mysql Ver 15.1 Distrib 5.5.59-MariaDB, for Linux (x86_64) using readline 5.1
