1. wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
2. rpm -ivh mysql80-community-release-el7-3.noarch.rpm 
3. sudo systemctl start mysqld
4. 查看登录密码  cat /var/log/mysqld.log
5. 在文件末尾处找到  [MY-010454] [Server] A temporary password is generated for root@localhost: jRuK?*TMx9I<
6. 使用上面的密码 登录mysql  
7. mysql -u root -p 
8. 登录完成后需要修改密码才可以进行其他操作
9.  ALTER USER 'root'@'localhost' IDENTIFIED BY 'Wasin1234!';
10. 刷新  FLUSH PRIVILEGES;
11. 退出mysq 并重启启动查看 新密码是否生效 service mysqld restart
12. 添加远程用户 create user 'wasin'@'%' IDENTIFIED BY 'Bkzxcdqwjsia1234!';
13. 刷新 FLUSH PRIVILEGES;