Edit the file /etc/postgresql/<version>/main/pg_hba.conf and find the following line: local all postgres md5 Edit the line and change md5 at the end to trust and save the file Reload the postgresql service sudo service postgresql reload This will load the configuration files. Now you can modify the postgres user by logging into the psql shell psql -U postgres Update the postgres user's password alter user postgres with password 'secure-passwd-here'; Edit the file /etc/postgresql/<version>/main/pg_hba.conf and change trust back to md5 and save the file Reload the postgresql service sudo service postgresql reload Verify that the password change is working psql -U postgres -W

Edit the file /etc/postgresql/<version>/main/pg_hba.conf and find the following line: local all postgres md5 Edit the line and change md5 at the end to trust and save the file Reload the postgresql service sudo service postgresql reload This will load the configuration files. Now you can modify the postgres user by logging into the psql shell psql -U postgres Update the postgres user's password alter user postgres with password 'secure-passwd-here'; Edit the file /etc/postgresql/<version>/main/pg_hba.conf and change trust back to md5 and save the file Reload the postgresql service sudo service postgresql reload Verify that the password change is working psql -U postgres -W

对于Windows(这对我很有帮助):

这就是我要参考的文档:如何重置PostgreSQL密码?

Open your cmd and go to C:\Program Files\PostgreSQL\12\data. This is usually the right path. You might have it stored somewhere else. Note that, if you have a different PostgreSQL version, there will be a different number. That doesn't matter. Find a pg_hba.conf file and copy it to somewhere else (that way you will have an unmodified version of this file, so you will be able to look at it after we make some changes) Open the pg_hba.conf file (not the backup, but the original) Find the multiple lines that start with host near the bottom of the file: host all all 127.0.0.1/32 md5 host all all ::1/128 md5 host replication all 127.0.0.1/32 md5 host replication all ::1/128 md5 Replace md5 with trust: host all all 127.0.0.1/32 trust host all all ::1/128 trust host replication all 127.0.0.1/32 trust host replication all ::1/128 trust Close this file Go to your search bar on windows and open Services app. Find postgres and restart it. Picture of services app Write cd.. in cmd and then cd bin. Your path should be C:\Program Files\PostgreSQL\12\bin Enter: psql -U postgres -h localhost Enter: ALTER USER postgres with password '<your new password>';Make sure that you include ; at the end “ALTER ROLE” should be displayed as an indication that the previous line was executed successfully Open original pg_hba.conf file and change back from trust to md5 Restart the server with Services app as before

将下面的代码添加到pg_hba.conf文件中。PostgreSQL的安装目录中会出现哪个

hostnossl    all          all            0.0.0.0/0  trust

它将开始工作。

对于Windows安装，将创建Windows用户。“psql”使用该用户连接到端口。如果您更改了PostgreSQL用户的密码，它不会更改Windows用户的密码。 只有当您可以访问命令行时，下面的命令行才能工作。

相反，您可以使用Windows GUI应用程序“c:\Windows\system32\lusrmgr.exe”。这个应用程序管理由Windows创建的用户。现在可以修改密码了。

当从命令行连接到PostgreSQL时，不要忘记添加-h localhost作为命令行参数。如果不是，PostgreSQL将尝试使用PEER认证模式进行连接。

下面显示了密码重置、使用PEER身份验证登录失败和使用TCP连接登录成功。

# sudo -u postgres psql

could not change directory to "/root"
psql (9.1.11)
Type "help" for help.

postgres=# \password
Enter new password:
Enter it again:
postgres=# \q

失败:

# psql -U postgres -W

Password for user postgres:
psql: FATAL:  Peer authentication failed for user "postgres"

使用-h localhost:

# psql -U postgres -W  -h localhost

Password for user postgres:
psql (9.1.11)
SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256)
Type "help" for help.

postgres=#