Update your Hostname
From LinodeWiki
[edit] CentOS / Fedora (Redhat based distros)
To permanently change the hostname of your linode, edit the /etc/sysconfig/network file and change the HOSTNAME=localhost.localdomain line to:
HOSTNAME=fully.qualified.hostname
[edit] Non-CentOS
Linode has recently launched the Linode Library, which contains rigorously tested information. Please consult Getting Started for more information.
