Postgres.app configuration (port and other options)
The postgresql.conf-file at ~/Library/Application\ Support/Postgres/var/ is used by Postgres.app. The only problem: if you change the port in that file, that change will not be reflected in the menu-bar. So the elephant over there will still say "Running on Port 5432", although postgres might be running on, for example, port 5433. (Mac OS X 10.8.2, Server.app 2.2, Postgres.app 9.2.2.0)
I can see the output from ps aux |grep post /Applications/Postgres.app/Contents/MacOS/bin/postgres -D /Users/chenc26/Library/Application Support/Postgres/var -p5432So I think there must be some config in this app to specify the CLI parameter which ignore the value from config file.
I'm running a Mavericks 10.9.3 and opening Postgres app v9.3 config via nano ~/Library/Application\ Support/Postgres/var-9.3/postgresql.conf and uncommenting the port = 5432 line, then changing it to, say, 5433 did the trick for me. (Restarting the app was required, as the config file mentions). Afterwards the app correctly displays that it is running on port 5433.