I currently have a web server in place with several websites hosted and Webmin is already installed, however, I would like to install Virtualmin. Can I install virtualmin after the websites are up and running, or does it need to be a completely virgin install?
What OS and version are you running?
You can’t safely use the install script. It’s just too risky and too likely to break something.
You could install the Virtualmin virtual-server Webmin module, and configure it to suit your needs and import the existing domains. It won’t really be a “Virtualmin system” without a lot of manual work, but it’ll give you some Virtualmin capabilities. Installing the Virtualmin module(s) on a production system is safe and harmless…but running install.sh or
virtualmin config-system is generally not.