1.下载mysql的yum源

https://dev.mysql.com/downloads/repo/yum/

2.安装yum源

shell> sudo yum localinstall platform-and-version-specific-package-name.rpm

3.选择mysql版本

shell> yum repolist all | grep mysql

shell> sudo yum-config-manager --disable mysql56-community
shell> sudo yum-config-manager --disable mysql80-community
shell> sudo yum-config-manager --enable mysql57-community

4.查看mysql版本是否正确

shell> yum repolist enabled | grep mysql

5.安装mysql

shell> sudo yum install mysql-community-server

6.启动mysql

shell> sudo service mysqld start
Starting mysqld:[ OK ]