（二）mysql忘记root密码

(1)mysql 5.7.6以前版本

• 修改配置文件vim /etc/my.cnf

[mysqld]
skip-grant-tables

• 重启mysql

systemctl restart mysqld

• 修改密码和刷新授权表

mysql>update mysql.user set password=password("redhat") where user="root" and host="localhost";
mysql>flush privileges;

• 再次修改配置文件

#skip-grant-tables

• 重启mysql

systemctl restart mysqld 

(2)mysql 5.7.6以后的版本

• 修改配置文件vim /etc/my.cnf

[mysqld]
skip-grant-tables

• 重启mysql

systemctl restart mysqld 

• 修改密码和刷新授权表

mysql> select user,host,authentication_string from mysql.user;
mysql> update mysql.user set authentication_string=password('redhat') where user="root" and host="localhost";
mysql> flush privileges;

• 再次修改配置文件vim /etc/my.cnf

#skip-grant-tables

• 重启mysql

systemctl restart mysqld