FATAL ERROR lock file “postmaster.pid” already exists

Question

I have recently installed PostGIS on my Mac (El Capitan 10.11.4, Postgres is version 9.5.1) using Homebrew, and I am following these instructions - http://morphocode.com/how-to-

Answer 1

If you got no important data to lose :

sudo killAll postgres
brew services restart postgresql

AGAIN : You could get data corrupted by doing this !

do it at your own risk !