如果你在macOS上运行PostgreSQL，试试这些:

Edit the pg_hba.conf file sudo vi /Library/PostgreSQL/9.2/data/pg_hba.conf Change the "md5" method for all users to "trust" near the bottom of the file Find the name of the service ls /Library/LaunchDaemons Look for postgresql Stop the postgresql service sudo launchctl stop com.edb.launchd.postgresql-9.2 Start the postgresql service sudo launchctl start com.edb.launchd.postgresql-9.2 Start a psql session as postgres psql -U postgres (shouldn't ask for password because of 'trust' setting) Reset password in the psql session by typing: ALTER USER postgres with password 'secure-new-password'; \q Enter Edit the pg_hba.conf file Switch it back to 'md5' Restart services again

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

注意:在Linux上，您可以简单地运行sudo su - postgres来成为postgres用户，然后使用psql更改所需的内容。

我只是在Windows 10上有这个问题，在我的情况下，问题是我只是运行psql，它默认试图登录与我的Windows用户名(“内森”)，但没有PostgreSQL用户的名字，它没有告诉我。

所以解决方案是运行psql -U postgres而不是仅仅运行psql，然后我在安装时输入的密码就可以工作了。

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=#

按照步骤1找到最佳答案。

如果你使用Windows操作系统，这是我的补充。只遵循第1步，然后在web上打开pgAdmin或postgres，并单击顶部导航上的file。单击reset layout，最后重新加载应用程序。不管你输入什么密码都可以。我用的是1234。