如何重置pgsql的密码(Reset Forgotten Password For postgres User)

Background

How should we do if forgot our postgres User password . For some reason, after installing PostgreSQL, you may forget the password of the postgres user. In this case, you need to know how to reset the password.

如果忘记了我们的postgres用户密码，该怎么办。由于某些原因，在安装PostgreSQL之后，您可能会忘记postgres用户的密码。在这种情况下，您需要知道如何重设密码。

Importance Info : PostgreSQL uses the pg_hba.conf configuration file stored in the database data directory (e.g., C:\Program Files\PostgreSQL\12\data on Windows) to control the client authentication. The pg_hba.conf means host-based authentication.

Set the value to “trust” means that u can login as postgres without a password
Set the value to default value “md5” means that u should login as postgres with a password

这里有个重要信息：PostgreSQL使用存储在数据库数据目录中的pg_hba.conf配置文件来控制客户端的连接认证参数。

-将该值设置为“trust”意味着您可以以postgres`的身份登录，而无需输入密码。

-将值设置为“md5”的默认值意味着您应使用密码以postgres`身份登录

Solution

So our first step is to edit the pg_dba.conf file and change IPv4 connections from md5 to trust

所以我们第一步就是去设置pg_dba.conf 文件,把IPv4的属性改为md5

# TYPE  DATABASE        USER            ADDRESS                 METHOD# IPv4 local connections:
host    all             all             127.0.0.1/32            trust
# IPv6 local connections:
host    all             all             ::1/128                 md5
# Allow replication connections from localhost, by a user with the
# replication privilege.
host    replication     all             127.0.0.1/32            md5
host    replication     all             ::1/128                 md5

Restart the PostgreSQL server. If you are on Windows, you can restart the PostgreSQL from Services:

重启pgsql的服务,可以通过windows的服务中心,或者使用命令进行重启

Or run the following command from the window terminal:

pg_ctl -D “C:\Program Files\PostgreSQL\12\data” restart

Connect to PostgreSQL database server using any tool such as psql or pgAdmin (PostgreSQL will not require a password to login as we set to trust):

因为我们前面设置过trust,所以这里连接数据库是不需要密码的,使用以下命令直接登陆:

psql -U postgres

Execute the following command to set a new password for the postgres user.

输入sql语句执行重置密码操作:

ALTER USER postgres WITH PASSWORD ‘new_password’;

Restore the pg_dba.conf file ,set the trust back to md5, restart the PostgreSQL database server and connect to the PostgreSQL database server with the new password.

最后,还原 pg_dba.conf 文件,属性从trust设置回md5 ,重启pgsql服务.并尝试使用新密码连接数据库!

Done!

恭喜你,重置成功!