Ive actually had this problem for a while but I've finally decided to take it on. Postgres was initially installed using Brew.
After my upgrade to OSX 10.8.2 to receive a
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"?
error when I typed the
$ psql
command.
I see the following processes:
$ ps auxw | grep post
Tulsa 59222 0.0 0.2 2483256 14808 ?? Ss Thu03PM 0:02.61 /System/Library/PrivateFrameworks/DiskImages.framework/Resources/diskimages-helper -uuid 470DA5CC-1602-4D69-855F-F365A6512F90 -post-exec 4
Tulsa 57940 0.0 0.2 2498852 13648 ?? Ss Wed10PM 0:00.61 /System/Library/PrivateFrameworks/DiskImages.framework/Resources/diskimages-helper -uuid FAFAAAB4-0F67-42C8-864E-EF8C31A42EE3 -post-exec 4
root 24447 0.0 0.1 2476468 10080 ?? Ss 8Feb13 0:03.40 /System/Library/PrivateFrameworks/DiskImages.framework/Resources/diskimages-helper -uuid CC768720-12C2-436C-9020-548C275A6B0C -post-exec 4
Tulsa 74224 0.0 0.0 2432768 596 s002 R+ 7:24PM 0:00.00 grep post
$ which psql
/usr/local/bin/psql
$ pg_ctl start
pg_ctl: no database directory specified and environment variable PGDATA unset
Try "pg_ctl --help" for more information.
Andrew Lazarus
You haven't started the Postgres server. Some of the dmg packages for Postgres set it to run as a service on startup. But not however you did the install.
You need to init a data directory, start postgres, and then go from there.
initdb /some/directory # just do this ONCE
pg_ctl -D /some/directory start # many other options, e.g. logging, available here
psql postgres
You can set an environment variable for the data directory and you won't need the -D flag later. You can look that up later.
来源：https://stackoverflow.com/questions/14948406/how-to-start-postgres-server