title: Need help to change postgresql port on CentOS 7
body: <p>I just installed the postgresql (as it says on postgresql), server is running like  charm, no problem at all.<br/><br/>
  I just tried(want) to change the default port (5432) to (9898).<br/><br/>
  First I just tried to do it by postgresql.conf file under <code>/var/lib/pgsql/data/postgresql.conf</code>.<br/>
  I just remove the comment for <code>port</code> related line, and change it as <code>port=9898</code>, but there is a comment saying overriding port here doesn't change anything for RHEL and deriven guys, it also says try to override the port config by service config file<code>(cannot find it, where is it?)</code>.<br><br/>
  I also change the <code>postmaster.opts</code> too (doesn't work the same).<br/><br/>
  Finally! how may I change the Postgresql 9.2.7 port number on CentOS 7?</p>