Apache httpd starting issue regarding ServerName directive

After fresh installation of apache httpd 2.4, while starting the service I got this error:

# /etc/init.d/httpd restart
 * Starting web server httpd

 ... waiting httpd: apr_sockaddr_info_get() failed for server
httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName

Even though my hostname in RHEL 6 is setup properly in /etc/sysconfig/network file:

# cat /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=hs2.example.com 

To solve this issue, ServerName directive in the main httpd.conf need to be commented out and set as localhost: 

# vim /etc/httpd/conf/httpd.confServerName 

...
ServerName localhost
...

And now apache httpd restarting properly:

# /etc/init.d/httpd restart

Stopping httpd:                                            [  OK  ]

Starting httpd:                                            [  OK  ]