linux下mysql-5.6忘记root密码，重置root密码详细过程

 

在linux平台下使用mysql过程中忘记了root密码，对于运维和DBA来讲都是一件头疼的事情，下面来讲解下怎么进行重置mysql数据库root 密码：

1、首先停止mysql服务进程：

1 service mysqld stop

然后编辑mysql的配置文件my.cnf

1 vim /etc/my.cnf

找到 [mysqld]这个模块：

在最后面添加一段代码

1 skip-grant-tables   ##忽略mysql权限问题，直接登录

然后保存 :wq!退出

启动mysql服务：

1 service mysqld start

直接进入mysql数据库：

 1 Starting MySQL. SUCCESS!
 2 [root@web1 ~]# mysql
 3 Welcome to the MySQL monitor.  Commands end with ; or \g.
 4 Your MySQL connection id is 1
 5 Server version: 5.6.34 Source distribution
 6
 7 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 8
 9 Oracle is a registered trademark of Oracle Corporation and/or its
10 affiliates. Other names may be trademarks of their respective
11 owners.
12
13 Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
14
15 mysql> 

使用mysql表，然后进行修改mysql的root密码：

 1 mysql> use mysql; ##使用mysql数据库
 2 Reading table information for completion of table and column names
 3 You can turn off this feature to get a quicker startup with -A
 4
 5 Database changed
 6 mysql> update user set password=password("123456") where user="root";##更新密码
 7 Query OK, 4 rows affected (0.00 sec)
 8 Rows matched: 4  Changed: 4  Warnings: 0
 9
10 mysql> flush privileges;##刷新权限
11 Query OK, 0 rows affected (0.00 sec)

 1 [root@web1 ~]# ps -ef |grep mysql  ##显示mysql现有的进程
 2 root      56407      1  0 17:50 pts/0    00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/data/mysql --pid-file=/data/mysql/web1.pid
 3 mysql     56533  56407  0 17:50 pts/0    00:00:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/data/mysql/web1.err --pid-file=/data/mysql/web1.pid
 4 root      56560   1737  0 17:55 pts/0    00:00:00 grep mysql
 5 [root@web1 ~]# killall mysqld  ##删除mysql现有进程
 6 [root@web1 ~]# ps -ef |grep mysql
 7 root      56566   1737  0 17:56 pts/0    00:00:00 grep mysql
 8 [root@web1 ~]# service mysqld start ##重新启动mysql服务
 9 Starting MySQL. SUCCESS!
10 [root@web1 ~]# mysql -uroot -p ##使用新密码登录
11 Enter password:
12 Welcome to the MySQL monitor.  Commands end with ; or \g.
13 Your MySQL connection id is 1
14 Server version: 5.6.34 Source distribution
15
16 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
17
18 Oracle is a registered trademark of Oracle Corporation and/or its
19 affiliates. Other names may be trademarks of their respective
20 owners.
21
22 Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
23
24 mysql> 

注意：先把mysql服务进程关闭,把添加过的跳过验证信息删除，要不然对数据库安全威胁太大，

5.7版本

# 设置账户密码并退出
update user set authentication_string=password('PASSWORD') where user='root';