What VPS software does everyone use. I am more interested in the opensource versions rather than Virtuozzo where your looking at a couple thousand just for one server. I think this is a good topic because a number of us are looking to offer this service or are just plain curious about what it will take for them to tick!

There is the linux vserver project:

http://linux-vserver.org/

And my favorite, UserModeLinux, its does the best at emulating a full scale linux system and can run any linux os you want it to.

http://user-mode-linux.sourceforge.net/

Although note that niether of these are going to be easy to setup. It took me a while to figure out UML.

un2mike thanks for the great information. What was the hardest part about setting up UML?

The hardest part is getting a working filesystem. You need to figure out how to get different OS's installed, its a pain and each distro presents a new challenge You could look for premade filesystems with linux pre-installed, but there aren't alot of them around with any newer OS's like centos or fedora.

If you want an easy way to do it use Debian as the OS for the host and uml machines. Theres some good howto's and automated tools for debian which make it a breeze to install.

Good advice. There is alot of money in this market I am definitely going to setup a VPS soon.

We offer FREE VPS via H-Sphere. It is free and works very well. We also offer Cpanel, CP+, webmin, Usermin and Virtualmin to our clients on the VPS. I do not think Ensim will run on FreeVPS. Overall it is very good. We had a few issues with the kernel but that has been fixed with a new kernel release a few months back.

i used to use linux-vserver.org, some of the documentations hard to understand

I remember seeing FreeVPS from H-Sphere site

UserModeLinux is recommended I have played around with this ands its quite feature full.

Yeh i quite like it aswell i would recommend it aswell !!