I'm getting a common Mac OSX error for Homebrew installations of Postgres,
No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
This is apparently due to there being multiple installs on the system. However, the usual steps are not resolving things.
I can successfully start Postgres and running:
ps auxw | grep post
returns ..
euanmillar 847 0.0 0.0 2432768 588 s000 R+ 11:19am 0:00.00 grep postgres
euanmillar 845 0.0 0.0 2439324 448 ?? Ss 11:19am 0:00.00 postgres:
stats collector process
euanmillar 844 0.0 0.0 2443176 1520 ?? Ss 11:19am 0:00.00 postgres:
autovacuum launcher process
euanmillar 843 0.0 0.0 2443044 544 ?? Ss 11:19am 0:00.00 postgres: wal writer process
euanmillar 842 0.0 0.0 2443044 584 ?? Ss 11:19am 0:00.00 postgres: writer process
euanmillar 841 0.0 0.0 2443044 596 ?? Ss 11:19am 0:00.00 postgres: checkpointer process
euanmillar 839 0.0 0.0 2443044 3616 s000 S 11:19am 0:00.02 /us
so it looks like postgres is running.
I have commented in the following lines in postgresql.conf
port = 5432
unix_socket_directory = '/var/pgsql_socket'
unix_socket_permissions = 0777
and in var/pgsql_socket/ I do have a hidden file .s.PGSQL.5432
I have tried solutions to many of the posts here. This one especially seems similar:
https://dba.stackexchange.com/questions/21587/postgresql-is-running-locally-but-i-cannot-connect-why
But the difference is that I do have a '/var/pgsql_socket' directory which is CHOWN-ed to everyone. I have used Homebrew to completely remove and re-install Postgres and still I have the same issue.
You need to remove the postmaster.pid, which should be in the following path:
/usr/local/var/postgres/postmaster.pid
For me, i removed postmaster.pid in /usr/local/var/postgres. fixed me right up.
A simpler solution is to locate where the socket actually is vs where it's expected to be. In my case, I ran:
$ locate PGSQL.5432
/private/var/pgsql_socket/.s.PGSQL.5432
/private/var/pgsql_socket/.s.PGSQL.5432.lock
Then just symlink the expected socket location to the actual socket location.
$ ln -s /private/var/pgsql_socket/.s.PGSQL.5432 /tmp/.s.PGSQL.5432
The system client is being used and not your brew version. The symlink approach only lasts until the next restart. This approach fixes the root issue I believe
- sudo edit
/etc/paths - Move the line containing
/usr/local/binto the top of the file. (Before/usr/bin) - Uninstall your postgres gem(s) (
gem uninstall pg) - Start up new shell to load the new environment settings
bundle
That is not an OS X specific issue. You will need to clean up your postgres installation and then reinstall it again. I have faced this issue on my ubuntu 12.04. While cleaning your previous installation, you will need to remove all packages starting with postgres (postgresql, postgresql-common, postgresql-client etc), in other words, postgres*. I have not used brew, have used port on OS X Lion. I guess the equivalent command should be sudo brew remove postgres*. A sudo brew install postgresql should then do the trick.
Also, if you feel the server is already running, you can try sudo -u postgres createuser. If that fails, you will need to reinstall.
However, the output of your ps aux | grep post is actually the grep command itself. Not of the postgres server running.
EDIT: Looks like the following link could be of help https://dba.stackexchange.com/questions/21587/postgresql-is-running-locally-but-i-cannot-connect-why If yes, then this question might be a duplicate.
I had the same problem on Mac Serria. In Mac Serria you can find postmaster.pid inside /Users/<user_name>/Library/Application Support/Postgres/var-9.6 if you used GUI installer rather than homebrew.
Once you delete this file then everything should work fine.
来源：https://stackoverflow.com/questions/17240516/mac-osx-lion-postgres-does-not-accept-connections-on-tmp-s-pgsql-5432