Connection refused (PGError) (postgresql and rails)

Question

I keep getting this error when i try to run my localhost using \"$rails s\":

(Mac OSX 10.8.3) (ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-darwin12.3.0]) (R

Answer 1

The error message is instrumental:

could not connect to server: Connection refused
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5433?

port

You may be trying to connect to the wrong port.
Standard port is 5432. Check how (and whether at all) you started your postgres server:

postgres@db:~$ ps -auxww | grep ^postgres
... 
postgres  1274  0.0  0.3 1437240 57308 ?       S    May27   5:01 /usr/lib/postgresql/9.1/bin/postgres -D /var/lib/postgresql/9.1/main -c config_file=/etc/postgresql/9.1/main/postgresql.conf

The manual has related information here.

In my example, settings from /etc/postgresql/9.1/main/postgresql.conf got used, which says (among many other settings):

port = 5432

Or run:

netstat -nlp | grep postgres

Or just look here (at least in Debian or Ubuntu):

ls -lA /var/run/postgresql/

PostgreSQL picks the next free port if you create a new database cluster. Since you installed repeatedly, you may have confused port numbers.

listen_addresses

Or you just forgot to allow TCP/IP connections. Related answers:

• Run batch file with psql command without password
• What's the difference between "local" and "localhost" connection types in pg_hba.conf?
• no pg_hba.conf entry for host