问题
Since upgrading OSX to version 10.7.3, when I attempt to run a Django "syncdb" command, I receive the following psycopg2 error from Postgresql 8.4.2:
psycopg2.OperationalError: 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"?
I'm able to open psql without incident, but when I attempt to run "pg_ctl status", I receive this error as well:
pg_ctl: could not open PID file "/Library/PostgreSQL/8.4/data/postmaster.pid": Permission denied
Is there a correlation?
回答1:
I had the same problem too: updated osx to 10.7.3 and after I restarted the postgres server I got the same issue when I tried to run $ ./manage.py dbshell that goes through psycopg2, but didn't have problem connecting to postgres using psql.
To me the problem appears to be related just to "connections on Unix domain socket", because psycopg2 uses the newly 10.7.3 osx updated postgres library.
I tried to reinstall psycopg2, but nothing was changed.
So, I changed the HOST value on the databases section of my django settings.py, and instead of having an empty string I put 'localhost'.
and it works perfectly!
回答2:
Eelke 's problem was the same as mine. The quickest fix for this would be to add
export PGHOST=/tmp
an environment variable in your .bashrc/.zshrc/etc file (depending on which you use).
The best fix would be to set the specific path in your apps config file.
回答3:
Did a bit of testing on my Mac and I noticed that there are two versions on my system for several commands. One version is in /usr/bin the other is in /Library/PostgreSQL/9.0/bin. The version in /usr/bin is expecting /var/pgsql_socket/.s.PGSQL.5432, the right version for my install expects /tmp/.s.PGSQL.5432
The version in /usr/bin is 9.0.5 and it has been installed by Apple.
Unfortunatly I do not know much about django, but my bet is it is either calling a command in the wrong path or it is loading a library from the wrong location.
回答4:
You can fix the problem by creating a symlink:
ln -s /tmp/.s.PGSQL.5432 /var/pgsql_socket/
回答5:
This did the trick for me in the end...
Change the HOST value in the database dictionary in settings.py to this:
'HOST': '/tmp',
Source: http://jeffammons.net/2011/09/fixing-postgres-on-mac-10-7-tiger-for-django
回答6:
Reinstalling psycopg2 worked for me
回答7:
I ran into the same issue just after upgrading to OSX 10.7.3; reinstalling PostgreSQL solved the problem and did not delete my existing data.
来源：https://stackoverflow.com/questions/9133870/postgresql-socket-error-on-osx-10-7-3-when-running-djangos-syncdb