CentOS 7 MySQL5.7版本忘记数据库密码后的密码重置

操作环境：CentOS 7，MySQL 5.7

[root@localhost ~]# cat /etc/redhat-release 
CentOS Linux release 7.7.1908 (Core)

Server version: 5.7.25-log MySQL Community Server (GPL)

条件：忘记MySQL root用户登陆密码
1.修改配置文件，跳过密码验证

#echo "skip_grant_tables" >> /etc/my.cnf
#systemctl restart mysqld

2.登陆mysql，并重置密码

#mysql

>flush privileges;
>alter user 'root'@'localhost' identified by 'New_Password';
如果以上命令无法修改root密码，则使用以下命令直接修改mysql.user表
>update mysql.user set authentication_string = password('New_Password') where user='root' and host='localhost'; 

3.重启验证

#systemctl restart mysqld

4.修改配置表关闭skip_grant_tables

#sed -ri '/skip_grant_tables/d' /etc/my.cnf
#systemctl restart mysqld