MySQL changes root password
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Environment related:
OS: CentOS release 6.9
IP: 192.168.1.10
MySQL: MariaDB-10.1.30
1. Confirmation before modification
To change the root password, you need to restart the mysql library. Confirm that production can really restart the mysql library;
Confirm whether production uses the root user to connect to the library directly. If so, Corresponding changes must be made;
Please stop the application connected to the library before changing the password, that is, stop all production lines related to the library.
2. Stop the database and change the password
ps -ef|grep mysql|grep -v grep # 找到对应的mysql服务器守护进程，查看是否有其他mysql服务守护进行存在 ps -ef|grep mysql|grep -v grep|xargs kill -9 # 杀掉root启动库的命令进程和库的守护进程，否则库会自动再次启动 # 杀掉进程，停库，杀掉进程之前请确保连接到库的应用全部停掉！！！ mysqld_safe --user=mariadb --skip-grant-tables & # 忽略授权表启动库，此时如果使用密码则无法登陆库 # 连接到库的应用如果没有停掉，此时是无法成功连接到库的 mysql use mysql; select Host,User,Password from user where user='root'; exit; # 进到mysql库中，查询当前的root密码的密值，保存密值用以回滚 # 比如我当前密码是vincent，密值是'*CDA83EBFF468E905FF304FE0D3D9F4D665C6579D' mysql use mysql; update user set password=password('test') where user='root'; exit; # 进到mysql库中，设置root密码 mysqladmin shutdown mysqld_safe --user=mariadb & # 重启库，登录测试 mysql -uroot -ptest -Dmysql exit; # 登录成功
3. Roll back the operation
After you change the root password, Many problems were found, such as unknown applications connecting to the library with the original root password (fucked historical problems), which needed to be rolled back.
mysql -uroot -ptest -Dmysql update user set password='*CDA83EBFF468E905FF304FE0D3D9F4D665C6579D' where user='root'; flush privileges; exit; # 使用上一步记录的root密码修改前的密值进行回滚 mysql -uroot -pvincent -Dmysql exit; # 回滚完成
4. Related knowledge points
You can directly use the secret value of the password to set the password. Currently, there is no way to directly reverse the secret value into the plain text of the password. View You can use the password function for the password value:
mysql -uroot -pvincent select password('vincent'),password('test');
But if you know the password value, you can modify a user's password with root privileges without knowing it, use it, and then restore it.
This situation is mostly used when a user forgets his password and resets his password. The same situation also occurs in the Oracle database.
The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.
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