对于Postgres 9.5版本，使用以下命令:

psql -h localhost -U postgres

希望这能有所帮助。

遵循以下步骤，它将为你工作:

run msfconsole type db_console some information will be shown to you chose the information who tell you to make: db_connect user:pass@host:port.../database sorry I don't remember it but it's like this one then replace the user and the password and the host and the database with the information included in the database.yml in the emplacement: /usr/share/metasploit-framework/config you will see. rebuilding the model cache in the background. Type apt-get update && apt-get upgrade after the update restart the terminal and lunch msfconsole and it works you can check that by typing in msfconsole: msf>db_status you will see that it's connected.

对于使用docker并正确遵循官方文档说明的用户，如果仍然遇到此问题，请重新启动窗口并重试。

在尝试了许多其他人的解决方案后，都没有成功，这个答案最终帮助了我。

https://stackoverflow.com/a/16974197/2433309

简而言之，跑步

sudo -u postgres createuser owning_user

创建名为owning_user(在本例中为h9uest)的角色。在此之后，您可以在终端上运行rake db:create，使用您设置的任何帐户名，而无需进入Postgres环境。

对于Postgres 9.5版本，使用以下命令:

psql -h localhost -U postgres

希望这能有所帮助。

对我来说，像将端口从5432更改为5433这样简单的操作就可以了。