Using the Vyatta command line interface (CLI) you can change the hostname and even the domain name of your Vyatta installation.

To set the hostname do the following:

configure
set system host-name Vyatta
commit

To set the domain name do the following:

configure
set system domain-name jermsmit.com
commit

After each above you will want to ‘commit’ and later ‘save’ if you plan on keeping the settings.