httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName or
httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain for ServerName you need to change it to make your server identifiable on the network. Hostname is the name that server calls itself i.e. it could be cp.yourdomain.com or mail.yourdomain2.com
In order to change hostname on your CentOS server permanently follow these steps
1. At your domain registrar level assign new host record to your server's IP address
2. Make sure you have nano installed
yum install nano
3. Edit network configuration file while logged in as root
nano /etc/sysconfig/network
4. It will open file with the content like below:
NETWORKING=yes
HOSTNAME=localhost.localdomain
GATEWAY=123.234.123.234
5. Change the HOSTNAME to the name that you've assigned at your domain registrar level
6. Hit Ctrl-X to exit and save changes
7. Reboot your server for changes to take effect
