1.下载mysql源安装包

shell> wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

2.安装mysql源

shell> yum localinstall mysql57-community-release-el7-8.noarch.rpm 

3.检查mysql源是否安装成功

shell> yum repolist enabled | grep "mysql.*-community.*"

4.修改 vim /etc/yum.repos.d/mysql-community.repo源 ，改变默认安装的mysql版本。比如要安装5.6版本，将5.7源的enabled=1改成enabled=0。然后再将5.6源的enabled=0改成enabled=1即可。

5.安装MySQL

shell> yum install mysql-community-server

6.启动MySQL服务

shell> systemctl start mysqld

7.开机启动

shell> systemctl enable mysqld
shell> systemctl daemon-reload

8.修改root本地登录密码

1）查看mysql密码

shell> grep 'temporary password' /var/log/mysqld.log

2）连接mysql

shell> mysql -uroot -p

3）修改密码[注意：后面的分号一定要跟上]

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';

或者：

mysql> set password for 'root'@'localhost'=password('MyNewPass4!');  
mysql> show variables like '%password%';

9.添加远程登录用户

mysql> GRANT ALL PRIVILEGES ON *.* TO 'caoxiaobo'@'%' IDENTIFIED BY 'Caoxiaobo0917!' WITH GRANT OPTION;