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。

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

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。

如果你在Windows上，你可以直接运行

net user postgres postgres

并以postgres/postgres用户/密码登录PostgreSQL。