在linux平台下使用mysql過程中忘記了root密碼，對於運維和DBA來講都是一件頭疼的事情，下面來講解下怎么進行重置mysql數據庫root 密碼：

1、首先停止mysql服務進程：

 1 service mysqld stop 

然后編輯mysql的配置文件my.cnf

1 vim /etc/my.cnf

找到 [mysqld]這個模塊：

在最后面添加一段代碼

1 skip-grant-tables   ##忽略mysql權限問題，直接登錄

然后保存 :wq!退出

啟動mysql服務：

1 service mysqld start

直接進入mysql數據庫：

 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，然后進行修改mysql的root密碼：

 1 mysql> use mysql; ##使用mysql數據庫
 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";##更新密碼
 7 Query OK, 4 rows affected (0.00 sec)
 8 Rows matched: 4  Changed: 4  Warnings: 0
 9 
10 mysql> flush privileges;##刷新權限
11 Query OK, 0 rows affected (0.00 sec)

 

 

 1 [root@web1 ~]# ps -ef |grep mysql  ##顯示mysql現有的進程
 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  ##刪除mysql現有進程
 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 ##重新啟動mysql服務
 9 Starting MySQL. SUCCESS! 
10 [root@web1 ~]# mysql -uroot -p ##使用新密碼登錄
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服務進程關閉,把添加過的跳過驗證信息刪除，要不然對數據庫安全威脅太大，

 5.7版本

# 設置賬戶密碼並退出 update user set authentication_string=password('PASSWORD') where user='root';