psql：无法连接到服务器：MAC OSX 上没有这样的文件或目录

Question

我正在尝试使用 home brew 在我的 MAC 上安装 PostgreSQL，当我尝试运行命令 psql 时出现以下错误

Harshas-MacBook-Pro:~ harshamv$ psql
psql: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

看起来系统无法识别安装。

Harshas-MacBook-Pro:~ harshamv$ locate psql | grep /bin
/usr/local/Cellar/postgresql/9.4.0/bin/psql
/usr/local/bin/psql

进程似乎正在运行

    Harshas-MacBook-Pro:~ harshamv$ ps -aef|grep postgres  
      501 12075 11832   0 11:54AM ttys001    0:00.00 grep postgres

还有plist文件

Harshas-MacBook-Pro:~ harshamv$ launchctl load -w /usr/local/Cellar/postgresql/9.4.0/homebrew.mxcl.postgresql.plist  
/usr/local/Cellar/postgresql/9.4.0/homebrew.mxcl.postgresql.plist: Operation already in progress


Harshas-MacBook-Pro:~ harshamv$ which psql
/usr/local/bin/psql

Harshas-MacBook-Pro:~ harshamv$ echo $PATH
/Users/harshamv/.rvm/gems/ruby-2.1.2/bin:/Users/harshamv/.rvm/gems/ruby-2.1.2@global/bin:/Users/harshamv/.rvm/rubies/ruby-2.1.2/bin:/Applications/bin/php5/bin/:/Applications/Mamp/htdocs/prayag/lib/Cake/Console:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/harshamv/.rvm/bin:/usr/local/mongodb/bin

Answer 1

您没有运行 PostgreSQL 服务器。您的 ps 输出仅显示您自己的 ps grep。

您还可能安装了两个版本的 PostgreSQL，并且您运行的 psql 客户端与错误的一个相关联。您可以运行 which -a psql 来查看 PATH 中的所有 psql 二进制文件。

The PostgreSQL Wiki has a page devoted to figuring out Homebrew problems.

This answer to your exact problem may help.