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';