centos 7忘记mysql的密码是解决办法

方法一、找回安装是的初始密码：
1、grep 'temporary password' /var/log/mysqld.log

方法二、使用操作系统账号和密码，进行修改密码
1、mysql -uroot -p
2、输入你的centos的密码
3、UPDATE mysql.user SET authentication_string = PASSWORD('MyNewPassword') WHERE User = 'root' AND Host = 'localhost';
注：如果显示 ERROR 1819 (HY000): Your password does not satisfy the current policy requirements，说明你的密码不符合安全要求，
4、FLUSH PRIVILEGES;
5、quit;

方法三、强制进行修改密码
1、systemctl stop mysqld
2、systemctl set-environment MYSQLD_OPTS="--skip-grant-tables"
3、systemctl start mysqld
4、mysql -u root
5、UPDATE mysql.user SET authentication_string = PASSWORD('MyNewPassword') WHERE User = 'root' AND Host = 'localhost';
注：如果显示 ERROR 1819 (HY000): Your password does not satisfy the current policy requirements，说明你的密码不符合安全要求，
6、FLUSH PRIVILEGES;
7、quit;