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

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

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。

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。

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。

Windows用户PostgreSQL最新版本(大于10):

到PostgreSQL安装位置，搜索pg_hba.conf，你会在..\postgres\data\pg_hba.conf中找到它。

用记事本打开这个文件，找到这行:

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5
#..

Change the method from *md5* to *trust*:

# 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                 trust
# ...

现在转到你的SQL shell (PSQL)，让一切都为空，

Server [localhost]:
Database [postgres]:
Port [8000]:
Username [postgres]:

这次它不会要求你输入密码，你就可以登录了，

现在运行这一行:

  `ALTER USER yourusername WITH SUPERUSER`

现在您可以将\q留在外壳中。

再次进入“pg_hba.conf”文件，将“METHOD”从“trust”修改为“md5”并保存。

现在使用新用户和密码登录，可以检查\du的属性。