RPM方式安装

1. 卸载MariaDB库

[root@localhost ~]# yum remove mariadb-libs -y

2. 安装Perl模块

[root@localhost ~]# yum install perl-Module-Install -y

3. 下载MySQL的安装包
   下载链接为
   http://repo.mysql.com/yum/mysql-5.6-community/el/7/x86_64/mysql-community-common-5.6.47-2.el7.x86_64.rpm
   http://repo.mysql.com/yum/mysql-5.6-community/el/7/x86_64/mysql-community-libs-5.6.47-2.el7.x86_64.rpm
   http://repo.mysql.com/yum/mysql-5.6-community/el/7/x86_64/mysql-community-client-5.6.47-2.el7.x86_64.rpm
   http://repo.mysql.com/yum/mysql-5.6-community/el/7/x86_64/mysql-community-server-5.6.47-2.el7.x86_64.rpm
   可以在Windows系统下载好再导入CentOS
4. rpm命令安装MySQL客户端和服务器
   按以下顺序安装

[root@localhost ~]# rpm -ivh mysql-community-common-5.6.47-2.el7.x86_64.rpm
[root@localhost ~]# rpm -ivh mysql-community-libs-5.6.47-2.el7.x86_64.rpm
[root@localhost ~]# rpm -ivh mysql-community-client-5.6.47-2.el7.x86_64.rpm
[root@localhost ~]# rpm -ivh mysql-community-server-5.6.47-2.el7.x86_64.rpm

5. 启动和设置开机启动MySQL Server

[root@localhost ~]# systemctl start mysqld
[root@localhost ~]# systemctl enable mysqld

6. 查询MySQL Server的状态，正常是active (running)状态

[root@localhost ~]# systemctl status mysqld

YUM方式安装

上述步骤2，3，4替换为下面两步

1. rpm命令安装MySQL的repo源

[root@localhost ~]# rpm -ivh http://repo.mysql.com/yum/mysql-5.6-community/el/7/x86_64/mysql-community-release-el7-5.noarch.rpm

2. yum命令安装

[root@localhost ~]# yum install mysql-community-server -y