1.下载mysql源安装包
shell> wget http://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm
2.安装mysql源
shell> yum localinstall mysql80-community-release-el7-1.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
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;
如果此方法不行，那么执行如下脚本：
重新进入mysql命令后 执行如下命令（mysql 8.0下执行如下）
#创建账户
create user \'xiaomage\'@\'%\' identified by \'MyNewPass4!\';
#赋予权限，with grant option这个选项表示该用户可以将自己拥有的权限授权给别人
grant all privileges on *.* to \'xiaomage\'@\'%\' with grant option;
#改密码&授权超用户，flush privileges 命令本质上的作用是将当前user和privilige表中的用户信息/权限设置从mysql库(MySQL数据库的内置库)中提取到内存里
flush privileges;