I was supprised to find that there was no RPM provided by yum for webmin; neither in the base packages or Dag repository. For anyone who wants it is is avalible using my yum repository. Add the following to a file /etc/yum.repos.d/Doylenet.repo
[doylenet] name=Doylenet custom repository for CentOS baseurl=http://files.doylenet.net/linux/yum/centos/5/i386/doylenet/ gpgcheck=1 gpgkey=http://files.doylenet.net/linux/yum/centos/RPM-GPG-KEY-rdoyle enabled=1
You can now install it using the command below
yum install webmin
Accessing Webmin is as easy as going to https://server:10000 and logging in with your root account.