I have dealt with this error quite a few times, but so infrequently that I forget the solution. When upgrading or wiping and reinstalling PostgreSQL via Homebrew, sometimes a few things get dropped by the scripts for some reason.
Situation: Postgres is running, database has been created, I can log in via psql and interact with the database just fine. Even Django, running via the development runserver, can interact with the database fine. However, when you try to test the production server on Apache, you get the dreaded error:
could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"?
Here is the solution:
Quick check to see if /var/pgsql_socket exists:
ls /var/ # nope, nothing here
So then just make one, per the instructions found here
sudo mkdir /var/pgsql_socket/
ln -s /private/tmp/.s.PGSQL.5432 /var/pgsql_socket/
Reload your apache page and voila, it works.
System config: OSX 10.12.5 (Sierra), httpd24, postgresql@9.5 (9.5.7), django 1.9.2
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