How to set the fqdn on a CentOS server?

Question

I set my hostname in the /etc/sysconfig/network file to host.example.com

HOSTNAME=host.example.com

Fyi, I then issued a reboot on the machine.

I have a problem with Puppet: when I run Facter on this machine, it returns the following information :

#facter fqdn

host.com

So puppet generates a wrong certificate and so on...

Here is what happens on my host :

# hostname

host.example.com

# hostname --fqdn

example.com

# hostname -y

(none)

# dnsdomainname

com

I don't understand why Facter is getting the wrong information... What did I do wrong?

Solution

Add the host to the /etc/hosts file for DNS resolution :

10.1.2.3 host.example.com host