Vic

How it worked for me:

FYI: Instead of

sudo -u postgres createuser chris -s

I used:

sudo -i -u postgres createuser chris -s

Also, in the config/database.yml file, under pool:5, add

  host: localhost
  username: pguser
  password: pguser_password

(pguser) + (pguser_password) is the username and password you created. Also add this to the "test" envrionment section.

And finally if rails server doesn't work, if you're using a Virtual Server like Digital Ocean, use:

rails server --binding=server_public_IP

where (server_public_IP) is the server's IP address. Then use http://server_public_IP:3000 in your web browser.