无法连接Postgres服务器

Question

When I try to connect server to create database. I am getting this error.

Couldn't create database for {"adapter"=>"postgresql", "encoding"=>"unicode", "host"=>"localhost", "socket"=>"/var/run/postgresql/.s.PGSQL.5432", "pool"=>5, "min_messages"=>"error", "database"=>"rails_contributors_test"}
-- enable_extension("plpgsql")
rake aborted!
PG::ConnectionBad: could not connect to server: Connection refused
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?

I tried a lot but didn't get success. Looking for help.

Postgres version I have as

which postgres
=> /usr/local/bin/postgres
postgres --version
=> postgres (PostgreSQL) 9.4.4

Answer 1

Try installing Postgres.app on your Mac OSX.

and start the postgres ie click on Open psql .

Then, restart the rails server.

After this, it should fix your issue.

Update (If the above does not work)

• To fix the issue, remove the PID file. Find the postgres data directory. On Mac OSX using homebrew it is /usr/local/var/postgres/ .

• To make sure this is the problem, look at the log file ( server.log ). On the last lines you will see: FATAL: lock file "postmaster.pid" already exists HINT: Is another postmaster (PID 347) running in data directory "/usr/local/var/postgres"?

• If so, rm postmaster.pid

• Restart your server. On Mac OSX, do:

  launchctl unload homebrew.mxcl.postgresql.plist
launchctl load -w homebrew.mxcl.postgresql.plist