centos下mysql忘记密码重置方法

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当在CentOS系统中遗忘MySQL密码时，可以通过关闭外网访问、修改my.cnf配置文件启用无密码登录、重启mysqld服务、登录后重设root密码，然后恢复配置并再次重启服务来完成密码重置。

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1、首先确认服务器处于安全的状态，可以将mysql对外的端口关闭。

2、设置mysql登录无需密码：

（1）、进入my.cnf

[root@VM_0_15_centos ~]# vi /etc/my.cnf

（2）、在 [mysqld]中添加skip-grant-tables，如下操作，保存（wq）并退出

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-grant-tables

# 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

3、重启mysqld

[root@VM_0_15_centos ~]# service mysqld restart

4、登录并设置root密码

[root@VM_0_15_centos ~]# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.24 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, 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> USE mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> UPDATE user SET Password = password ( '123456' ) WHERE User = 'root' ;
Query OK, 4 rows affected, 1 warning (0.00 sec)
Rows matched: 4  Changed: 4  Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> quit;
Bye

5、进my.cnf将mysql登录将skip-grant-tables删掉

[root@VM_0_15_centos ~]# vi /etc/my.cnf

6、重启mysqld

[root@VM_0_15_centos ~]# service mysqld restart
Redirecting to /bin/systemctl restart  mysqld.service