PG::ConnectionBad after fresh install

Fresh OmniBus gitlab-ce 7.13.0-rc2.ce.0.el6 from RPM produces error after install resulting in a user facing HTTP 500.

Log shows:

PG::ConnectionBad (could not connect to server: No such file or directory
	Is the server running locally and accepting
	connections on Unix domain socket "/var/opt/gitlab/postgresql/.s.PGSQL.5432"?
):

/opt/gitlab/embedded/service/gitlab-rails/config/database.yml:

production:
  adapter: postgresql
  encoding: unicode
  database: gitlabhq_production
  pool: 10
  username: 'gitlab'
  password: 
  host: '/var/opt/gitlab/postgresql'
  port: 5432
  socket: 
  sslmode: 
  sslrootcert: 

Setting host: '/var/opt/gitlab/postgresql' to host: fixes.