MySQL数据库忘记root密码解决

MySQL数据库忘记root密码解决：

• 进入配置文件/etc/my.cnf
• 在[mysqld]下加入一条语句：skip-grant-tables

• [mysqld] 
  datadir=/var/lib/mysql 
  socket=/var/lib/mysql/mysql.sock 
  skip-grant-tables 

   

• 重新启动mysqld：service mysqld restart
• 无密码登录MySQL数据库：mysql -uroot -p

• 进入数据库后操作：

  # 使用mysql库
  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
  # 一定要查看清楚user表的用户密码字段名
  mysql> select * from user limit 1\G;
  ******************* 1. row *********************
  Host: localhost
  User: root
  Select_priv: Y
  ...（此处省略）
  plugin: mysql_native_password
  auther_string: *81F5E21E35407D884A6CD4A731AEBFB7AF209E1B
  # 这串字符就是加密后的密码，选取其字段名
  password_expired: N
  password_last_changed: 2018-05-31 15:12:34
  password_lifetime: NULL
  account_locked: N
  1 row in set (0.00 sec)

• 修改密码：

  mysql> update user set auther_string=PASSWORD('123') where User='root';
  Query OK, 1 row affected, 1 warning (0.00 sec)
  Rows matched: 2 Changed: 1 Warnings: 1

• 修改成功后退出数据库，将配置文件中的无密码登录注释掉
• 重启mysqld： [root@BDKVM01 ~]# systemctl restart mysqld

• 验证：[root@BDKVM01 ~]# mysql -uroot -p123