[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-grant-tables 加入此句，登录无需密码
#Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
2、systemctl restart mysqld 重启Mysql
[root@cuichengjie ~]# systemctl restart mysqld
3.mysql 登录 无需密码
[root@cuichengjie ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.29 MySQL Community Server (GPL)
Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
4、输入命令重置密码
update mysql.user set authentication_string=PASSWORD('123456') where User='root';
更改密码为123456
再使用flush privileges;
