apache2 could not reliably determine the server’s fully qualified domain name using 127.0.0.1

Posted on 2010 January 25 by jontas

When apache complains like this.

check that the virtualhosts so that ServerName is set to a FQDN
check /etc/hostname [should be a fqdn] (after you have updated this, run “/bin/hostname -F /etc/hostname”
check /etc/hosts
Hint: use “apache2ctl configtest” to see if it helps

sudo: unable to resolve host hostname

Posted on 2010 January 21 by jontas

If using sudo gives the error message “unable to resolve host hostname” then one solution is to add the hostname in /etc/hosts

127.0.0.1	hostname.domain.com	hostname localhost