第一步：wget https://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
第二步：yum localinstall mysql57-community-release-el7-8.noarch.rpm
第三步：yum repolist enabled | grep "mysql.-community."
第四步： yum install mysql-community-server
第五步：systemctl start mysqld
第六步：systemctl status mysqld
第七步：systemctl status mysqld.service
第八步：systemctl enable mysqld
第九步：systemctl daemon-reload
找到默认密码：grep 'temporary password' /var/log/mysqld.log
生成默认密码：fgqEQgPV3j*f
登录并修改密码：mysql -uroot -p
修改密码：ALTER USER 'root'@'localhost' IDENTIFIED BY 'Ysx251924!';
授权：GRANT ALL PRIVILEGES ON . TO 'root'@'%' IDENTIFIED BY 'Ysx251924!' WITH GRANT OPTION;
开启防火墙端口权限：1 查看端口 firewall-cmd --list-ports
2 开发端口 firewall-cmd --zone=public --add-port=3306/tcp --permanent
3 重启 firewall-cmd --reload
