httpd Could not reliably determine the server s fully qualified domain name using 127 0 0 1 for ServerName

Question

I tried to restart my Apache server on CentOS 5 0 and got this message      httpd  Could not reliably determine the server s fully qualified domain name  using 127 0 0 1 for ServerName   Here is the  etc hosts file   127 0 0 1    server4-245    server4-245 com    localhost localdomain localhost   1        localhost6 localdomain6 localhost6   Here is the  etc sysconfig network file   NETWORKING yes NETWORKING IPV6 no HOSTNAME server4-245   I also have this in the Apache httpd conf file   ServerName localhost   However  I still get the first error message when I restart Apache

User · Answer

In httpd conf  search for  ServerName   It s usually commented out by default on Mac  Just uncomment it and fill it in  Make sure you also have the name ip combo set in  etc hosts

User · Answer

Most answers suggest to just add ServerName localhost to  etc apache2 apache2 conf   But quoting Apache documentation        The presence of this error message also indicates that Apache httpd was unable to obtain a fully-qualified hostname by doing a reverse lookup on your server s IP address  While the above instructions will get rid of the warning in any case  it is also a good idea to fix your name resolution so that this reverse mapping works    Therefore adding such a line to  etc hosts is probably a more robust solution     192 0 2 0  foobar example com  foobar   where 192 0 2 0 is the static IP address of the server named foobar within the example com domain   One can check the FQDN e g  with  hostname -A    shortcut for hostname --all-fqdn

User · Answer

Your hosts file does not include a valid FQDN  nor is localhost an FQDN  An FQDN must include a hostname part  as well as a domain name part  For example  the following is a valid FQDN   host server4-245 com   Choose an FQDN and include it both in your  etc hosts file on both the IPv4 and IPv6 addresses you are using  in your case  localhost or 127 0 0 1   and change your ServerName in your httpd configuration to match    etc hosts   127 0 0 1    localhost localdomain localhost host server4-245 com   1          localhost localdomain localhost host server4-245 com   httpd conf   ServerName host server4-245 com

User · Answer

Make sure you re editing the right httpd conf file  then the error about unreliable server s domain name should be gone  this is the most common mistake    To locate your httpd conf Apache configuration file  run   apachectl -t -D DUMP INCLUDES   Then edit the file and uncomment or change ServerName line into   ServerName localhost   Then restart your apache by  sudo apachectl restart

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After the initial install of Apache server  I got the following error while restarting the Apache service on Ubuntu nbsp 12 04  Precise Pangolin   The solution is really simple  Just add the ServerName directive to  etc apache2 httpd conf   sudo nano  etc apache2 httpd conf   Add  ServerName  localhost  Finally restart the Apache server   sudo  etc init d apache2 restart

User · Answer

In the Apache httpd conf file   ServerName  127 0 0 1

User · Answer

If you don t have httpd conf in folder  etc apache2  you should have apache2 conf - simply add      ServerName localhost   Then restart the apache2 service

User · Answer

So while this is answered and accepted it still came up as a top search result and the answers though laid out  after lots of research  left me scratching my head and digging a lot further  So here s a quick layout of how I resolved the issue   Assuming my server is myserver myhome com and my static IP address is 192 168 1 150    Edit the hosts file    sudo nano -w  etc hosts  127 0 0 1 localhost localhost localdomain localhost4 localhost4 localdomain4  127 0 0 1 myserver myhome com myserver  192 168 1 150 myserver myhome com myserver    1 localhost localhost localdomain localhost6 localhost6 localdomain6   1 myserver myhome com myserver  Edit httpd conf    sudo nano -w  etc apache2 httpd conf  ServerName myserver myhome com  Edit network    sudo nano -w  etc sysconfig network HOSTNAME myserver myhome com  Verify    hostname   output  myserver myhome com    hostname -f   output  myserver myhome com  Restart Apache    sudo  etc init d apache2 restart    It appeared the difference was including myserver myhome com to both the 127 0 0 1 as well as the static IP address 192 168 1 150 in the hosts file  The same on Ubuntu Server and CentOS

User · Answer

If you ve edited  etc apache2 httpd conf with the ServerName localhost you may be editing the wrong file  All answers I found were pointing towards that standard httpd conf  After some foraging  I found a good answer here  To locate the right httpd conf file use apachectl -t -D DUMP INCLUDES  I found mine was actually  usr local etc httpd httpd conf  Use your preferred editor to comment out the line  i e  remove the   before  starting with ServerName  and replace the domain name for the appropriate one     local environments should work with ServerName localhost  I hope this helps more people who may be stuck

User · Answer

I ve resolved the fully qualified domain name message on different occasions by adding my server hostname to the  etc apache2 httpd conf file and to the  etc apache2 apache2 conf file   Type hostname -f in your terminal   This query will return your hostname    Then edit the  etc apache2 httpd conf file  or create it if it does not exist for some reason  and add ServerName  lt your hostname gt    Alternatively  I have also been able to eliminate the message by adding ServerName  lt your hostname gt  to the  etc apache2 apache2 conf file   If all goes well  when you restart Apache  the message will be gone

User · Answer

Turns out that I had this problem and it was because I used  tabs  to indent lines instead of spaces   Just posting  in case it helps anyone

User · Answer

There are two ways to resolve this error    Include  etc apache2 httpd conf  Add the above line in file  etc apache2 apache2 conf Add this line at the end of the file  etc apache2 apache2 conf   ServerName localhost

[linux] httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName

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