mysql5.6密码忘记了该如何恢复

本文主要给大家简单讲讲mysql5.6密码忘记了该如何恢复，相关专业术语大家可以上网查查或者找一些相关书籍补充一下，这里就不涉猎了，我们就直奔主题吧，希望mysql5.6密码忘记了该如何恢复这篇文章可以给大家带来一些实际帮助。

实验环境：

1、centos7.3

2、mysql5.6.35

实验描述：

原mysql仅root账号可以登录且有密码保护，现在密码已经忘记无法找回。今天的目标就是通过破解，重置mysql的root密码。

实验进行时：

1、开始之前确定mysql不用密码已经不能登录了

[root@c73 mysql]# mysqlERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)[root@c73 mysql]#[root@c73 ~]# mysql -u root -p654321 //用654321这个密码也进不了。Warning: Using a password on the command line interface can be insecure.ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

2、跳过授权进入mysql

[root@c73 mysql]# systemctl stop mysql //停止mysql//由于我本身使用的是root账号，mysql运行需要mysql账号所以，增加了--user=mysql,//这里主要是使用--skip-grant-tables参数跳过授权表[root@c73 mysql]# mysqld --user=mysql --skip-grant-tables &[1] 6022[root@c73 mysql]# 2017-04-11 09:36:41 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).2017-04-11 09:36:41 0 [Note] mysqld (mysqld 5.6.35) starting as process 6022 ...2017-04-11 09:36:41 6022 [Note] Plugin 'FEDERATED' is disabled.2017-04-11 09:36:41 6022 [Note] InnoDB: Using atomics to ref count buffer pool pages2017-04-11 09:36:41 6022 [Note] InnoDB: The InnoDB memory heap is disabled2017-04-11 09:36:41 6022 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins2017-04-11 09:36:41 6022 [Note] InnoDB: Memory barrier is not used2017-04-11 09:36:41 6022 [Note] InnoDB: Compressed tables use zlib 1.2.32017-04-11 09:36:41 6022 [Note] InnoDB: Using Linux native AIO2017-04-11 09:36:41 6022 [Note] InnoDB: Using CPU crc32 instructions2017-04-11 09:36:41 6022 [Note] InnoDB: Initializing buffer pool, size = 128.0M2017-04-11 09:36:41 6022 [Note] InnoDB: Completed initialization of buffer pool2017-04-11 09:36:41 6022 [Note] InnoDB: Highest supported file format is Barracuda.2017-04-11 09:36:41 6022 [Note] InnoDB: 128 rollback segment(s) are active.2017-04-11 09:36:41 6022 [Note] InnoDB: Waiting for purge to start2017-04-11 09:36:42 6022 [Note] InnoDB: 5.6.35 started; log sequence number 16260072017-04-11 09:36:42 6022 [Note] Server hostname (bind-address): '*'; port: 33062017-04-11 09:36:42 6022 [Note] IPv6 is available.2017-04-11 09:36:42 6022 [Note]   - '::' resolves to '::';2017-04-11 09:36:42 6022 [Note] Server socket created on IP: '::'.2017-04-11 09:36:42 6022 [Note] mysqld: ready for connections.Version: '5.6.35'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server (GPL)[root@c73 mysql]# netstat -lnpt|grep 3306 //确定服务开启成功tcp6       0      0 :::3306                 :::*                    LISTEN      6022/mysqld         [root@c73 mysql]# mysql  //无密码进入mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> //成功进入^_^

3、修改root密码

mysql> set password for 'root'@'localhost' = password('654321');ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement// 在--skip-grant-tables模式下，以上修改密码的方法是行不通了。// 所以我们直接修改用户表来更新密码。mysql> update mysql.user set password=password("654321") where user='root';Query OK, 4 rows affected (0.00 sec) #更新成功了4条root用户的密码Rows matched: 4  Changed: 4  Warnings: 0// 最后别忘了刷新mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)mysql> exit //退出Bye

4、这时候我们再来用新密码测试看看能不能进入吧

[root@c73 ~]# ps aux|grep mysqlmysql     6022  0.0 11.6 1038816 452312 pts/0  Sl   09:36   0:00 mysqld --user=mysql --skip-grant-tablesroot      6113  0.0  0.0 112664   968 pts/1    R+   10:00   0:00 grep --color=auto mysql[root@c73 ~]# kill -9 6022 //结束掉原来的mysql服务[root@c73 ~]# systemctl start mysql 以正常模式开启mysql服务[root@c73 ~]# ps aux|grep mysqlmysql     6132  0.0  0.0 113252  1588 ?        Ss   10:00   0:00 /bin/sh /usr/bin/mysqld_safe --basedir=/usrmysql     6310  1.8  2.8 698944 110984 ?       Sl   10:00   0:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sockroot      6337  0.0  0.0 112664   972 pts/1    R+   10:01   0:00 grep --color=auto mysql[root@c73 ~]# mysql #测试不用密码无法进入ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)[root@c73 ~]# mysql -u root -p654321 #测试使用新密码进入成功^_^Warning: Using a password on the command line interface can be insecure.Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 3Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>

实验总结：

密码尽可能的保存好吧，如果是线上24小时不间断的业务，出现这种情况必须重启服务来处理，或多或少都会带来一些不必要的麻烦。

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