下载mysql源安装包

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

安装mysql源包

# yum localinstall mysql57-community-release-el7-.noarch.rpm

检查mysql源是否安装成功

# yum repolist enabled | grep "mysql.*-community.*"

看到下图(三个)表示成功：

mysql-connectors-community      MySQL Connectors Community

mysql-tools-community           MySQL Tools Community

mysql57-community               MySQL5. Community Server      

安装MySQL服务

# yum install mysql-community-server

启动MySQL服务

# systemctl start mysqld

查看MySQL的启动状态

# systemctl status mysqld

设置开机启动

# systemctl enable mysqld

# systemctl daemon-reload #重新载入

查看root默认密码

# grep 'temporary password' /var/log/mysqld.log

修改root密码

# mysql -uroot -p

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Abc1234!';

或者

mysql> set password for'root'@'localhost'=password('Abc1234!');

注意：mysql5.7默认安装了密码安全检查插件（validate_password），默认密码检查策略要求密码必须包含：大小写字母、数字和特殊符号，并且长度不能少于8位。否则会提示ERROR  (HY000): Your passworddoes not satisfy the current policy requirements错误

添加远程连接登录用户，如：用户名：root，密码：Abc1234!

mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'IDENTIFIED BY 'Abc1234!' WITH GRANT OPTION;

重启mysql服务

# systemctl restart mysqld

我这里使用SQLyog链接的，如果链接报类似下面错误：

    Host ‘’ is not allowed to connect to this MySQL server

请参考下面链接：https://blog.csdn.net/liguoqingxjxcc/article/details/82350411