I just installed postgresql on my Mac OS Lion machine. I've already uninstalled and reinstalled the pg gems.
When I run psql I get the following error:
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"?
running which psql:/usr/local/bin/psql
I installed postgresql using homebrew
Here is a lsof results for postgres:
postgres 21159 myuser cwd DIR 14,2 680 3528182 /usr/local/var/postgres
postgres 21159 myuser txt REG 14,2 5092464 3546949 /usr/local/Cellar/postgresql/9.1.3/bin/postgres
postgres 21159 myuser txt REG 14,2 599280 641674 /usr/lib/dyld
postgres 21159 myuser txt REG 14,2 297734144 3151814 /private/var/db/dyld/dyld_shared_cache_x86_64
postgres 21159 myuser 0r CHR 3,2 0t0 306 /dev/null
postgres 21159 myuser 1w REG 14,2 1193 3529245 /usr/local/var/postgres/server.log
postgres 21159 myuser 2w REG 14,2 1193 3529245 /usr/local/var/postgres/server.log
postgres 21159 myuser 3u systm 0t0
postgres 21159 myuser 4u unix 0xffffff8012b85578 0t0 ->0xffffff8012b85640
postgres 21159 myuser 5u IPv6 0xffffff80128f4e80 0t0 TCP localhost:postgresql (LISTEN)
postgres 21159 myuser 6u IPv4 0xffffff80128f9880 0t0 TCP localhost:postgresql (LISTEN)
postgres 21159 myuser 7u IPv6 0xffffff80128f5600 0t0 TCP localhost:postgresql (LISTEN)
postgres 21159 myuser 8u unix 0xffffff80202d9968 0t0 /tmp/.s.PGSQL.5432
postgres 21159 myuser 9u IPv6 0xffffff8013ebc508 0t0 UDP localhost:57404->localhost:57404
postgres 21170 myuser cwd DIR 14,2 680 3528182 /usr/local/var/postgres
postgres 21170 myuser txt REG 14,2 5092464 3546949 /usr/local/Cellar/postgresql/9.1.3/bin/postgres
postgres 21170 myuser txt REG 14,2 599280 641674 /usr/lib/dyld
postgres 21170 myuser txt REG 14,2 297734144 3151814 /private/var/db/dyld/dyld_shared_cache_x86_64
postgres 21170 myuser 0r CHR 3,2 0t0 306 /dev/null
postgres 21170 myuser 1w REG 14,2 1193 3529245 /usr/local/var/postgres/server.log
postgres 21170 myuser 2w REG 14,2 1193 3529245 /usr/local/var/postgres/server.log
postgres 21170 myuser 3u systm 0t0
postgres 21170 myuser 4u unix 0xffffff8012b85578 0t0 ->0xffffff8012b85640
postgres 21170 myuser 5 PIPE 0xffffff8015250290 16384 ->0xffffff8015250810
postgres 21170 myuser 6 PIPE 0xffffff8015250810 16384 ->0xffffff8015250290
postgres 21170 myuser 9u IPv6 0xffffff8013ebc508 0t0 UDP localhost:57404->localhost:57404
postgres 21171 myuser cwd DIR 14,2 680 3528182 /usr/local/var/postgres
postgres 21171 myuser txt REG 14,2 5092464 3546949 /usr/local/Cellar/postgresql/9.1.3/bin/postgres
postgres 21171 myuser txt REG 14,2 599280 641674 /usr/lib/dyld
postgres 21171 myuser txt REG 14,2 297734144 3151814 /private/var/db/dyld/dyld_shared_cache_x86_64
postgres 21171 myuser 0r CHR 3,2 0t0 306 /dev/null
postgres 21171 myuser 1w REG 14,2 1193 3529245 /usr/local/var/postgres/server.log
postgres 21171 myuser 2w REG 14,2 1193 3529245 /usr/local/var/postgres/server.log
postgres 21171 myuser 3u systm 0t0
postgres 21171 myuser 4u unix 0xffffff8012b85578 0t0 ->0xffffff8012b85640
postgres 21171 myuser 5 PIPE 0xffffff80152501e0 16384 ->0xffffff8015250760
postgres 21171 myuser 6 PIPE 0xffffff8015250760 16384 ->0xffffff80152501e0
postgres 21171 myuser 9u IPv6 0xffffff8013ebc508 0t0 UDP localhost:57404->localhost:57404
postgres 21172 myuser cwd DIR 14,2 680 3528182 /usr/local/var/postgres
postgres 21172 myuser txt REG 14,2 5092464 3546949 /usr/local/Cellar/postgresql/9.1.3/bin/postgres
postgres 21172 myuser txt REG 14,2 599280 641674 /usr/lib/dyld
postgres 21172 myuser txt REG 14,2 297734144 3151814 /private/var/db/dyld/dyld_shared_cache_x86_64
postgres 21172 myuser 0r CHR 3,2 0t0 306 /dev/null
postgres 21172 myuser 1w REG 14,2 1193 3529245 /usr/local/var/postgres/server.log
postgres 21172 myuser 2w REG 14,2 1193 3529245 /usr/local/var/postgres/server.log
postgres 21172 myuser 3u systm 0t0
postgres 21172 myuser 4u unix 0xffffff8012b85578 0t0 ->0xffffff8012b85640
postgres 21172 myuser 5 PIPE 0xffffff801449a650 16384 ->0xffffff8014497d10
postgres 21172 myuser 6 PIPE 0xffffff8014497d10 16384 ->0xffffff801449a650
postgres 21172 myuser 7u REG 14,2 8192 3529006 /usr/local/var/postgres/global/12174
postgres 21172 myuser 9u IPv6 0xffffff8013ebc508 0t0 UDP localhost:57404->localhost:57404
postgres 21173 myuser cwd DIR 14,2 680 3528182 /usr/local/var/postgres
postgres 21173 myuser txt REG 14,2 5092464 3546949 /usr/local/Cellar/postgresql/9.1.3/bin/postgres
postgres 21173 myuser txt REG 14,2 599280 641674 /usr/lib/dyld
postgres 21173 myuser txt REG 14,2 297734144 3151814 /private/var/db/dyld/dyld_shared_cache_x86_64
postgres 21173 myuser 0r CHR 3,2 0t0 306 /dev/null
postgres 21173 myuser 1w REG 14,2 1193 3529245 /usr/local/var/postgres/server.log
postgres 21173 myuser 2w REG 14,2 1193 3529245 /usr/local/var/postgres/server.log
postgres 21173 myuser 3u systm 0t0
postgres 21173 myuser 4u unix 0xffffff8012b85578 0t0 ->0xffffff8012b85640
postgres 21173 myuser 9u IPv6 0xffffff8013ebc508 0t0 UDP localhost:57404->localhost:57404
How do I resolve this error? Thanks!
First thing to try:
psql -h localhost
It may be that the client and server are trying to use different file locations for the UNIX domain socket. You can avoid this by connecting over tcp/ip.
来源：https://stackoverflow.com/questions/11321496/why-am-i-getting-a-could-not-connect-to-server-error-for-postgres-in-mac-os-lion