apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName

How to change your hostname on a Linux Server

by MMNCS on May 2nd, 2011, updated October 31, 2011

This small guide shows how to change the hostname on a Linux Server and how to avoid the warning: apache2: Could not reliably determine the server’s fully qualified domain name, using 127.0.0.1 for ServerName

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HowTo
Open the and edit the hostname file:

sudo nano /etc/hostname

Change the hostname as desired and save the file and exit

Open the hosts file

sudo nano /etc/hosts

Edit the /etc/hosts file to reflect our new change

127.0.0.1 localhost

127.0.0.1 YourHostName

Edit your httpd.conf and add your ServerName

nano /etc/apache2/httpd.conf

Add your server name:

ServerName YourHostName

Reboot the system for the new changes to take effect

sudo shutdown -r now

Done!

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Posted in Apache Web Server, Hosting, Server, Ubuntu

Tags: 2011, Apache Web Server, Dedicated Server, Guide, How To avoid Apache Warning: Using 127.0.0.1 for ServerName, howto change hostname, httpd.conf configuration, Linux Server Setup, ServerName, VPS

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21-5-2011
daigoumee
this post is very usefull thx!
Reply
13-6-2012
Ken
Thanks for this clarification on the error message “Could not reliably determine the server’s fully qualified domain name”.
It should be noted that you do not have to reboot the system in order for the changes to take place. You can simply restart the apache2 server software by using ‘apachectl graceful’ (for a “graceful” restart) or even just ‘apachectl restart’ .
The difference between the “graceful” and “normal” (for lack of a better term) restart is that with a “graceful” restart, the server should reload its configuration without terminating any connections or requests that any user might be making to the Apache2 web server at the time of the restart.
I may be wrong in some of the things I said in the last part of this comment, so don’t take my word for it! Reading the documentation helps to understand this a lot better :)
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