[CentOS] postgresql Service Blind

> 
> When I nmap the CentOS box, I can’t see that port open.  I’ve turned
> off SELinux, so I’m not sure why I can’t see the open port 5432.
> 
> What am I missing?  It has to be something I’ve overlooked.
> 
In postgresql.conf change the listen_address to be

  listen_address = '*'

by default it only listens on localhost.  It's documented in the file
and is easily googleable.

Use 'netstat -nlt' (or whatever the modern equivalent is) to see what's
listening on which address.

P.