BUG #12734: Postgresql not started after reboot

The following bug has been logged on the website:

Bug reference:      12734
Logged by:          Nunki
Email address:      lostcentaur@gmail.com
PostgreSQL version: 9.4.0
Operating system:   Centos 7
Description:

I did all steps to setup postgresql 9.4 on Centos7.  Even set the 'systemctl
enable postgresql-9.4.service'.  When i start postgres with systemctl start
all goes wel and the database is running.  When I reboot it is no longer
running.  systemctl status says something about 'could not bind to socket'.
When I add 'systemctl start postgresql-9.4.service' in /etc/bashrc postgres
is running after reboot.