1. 停止服务器的运行

sudo systemctl stop mysqld
ps aux | grep mysqld |grep -v grep

2. 使用—skip-grant-tables选项启动服务器

sudo -u mysql /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid --user=mysql --skip-grant-tables

3. 不使用密码连接到mysql，执行flush privileges重新加载授权，并更改用户以修改密码

mysql -u root

flush privileges;
alter user 'root'@'localhost' identified by 'Newpassword123,./';

4. 用新密码登陆mysql

5. 重启mysql服务器

ps aux | grep mysqld | grep -v grep

sudo kill -9 19619
ps aux | grep mysqld | grep -v grep

重启mysql

sudo systemctl start mysqld
ps aux | grep mysqld | grep -v grep