Re: Debian and OSS vs vSphere
Currently there is no drop-in replacement for ESX+vSphere in Debian.
(which handles large servers + has some GUI)
For small servers, Debian provides for "phpvirtualbox+VirtualBox" combo.
This lets you manage a single server.
...Which has a nice Web GUI:
For more professional Open-Source solution, it will be OpenStack +
it's WUI (Dashboard)
This one lets you manage a cloud of servers, and includes a
distributed storage solution (swift), and distributed authentication
Video: (OpenStack + it's WUI Dashboard)
OpenStack documentation, which does not match the actual software
currently, and it is in "testing" category. I'm working to improve it
(along with fellow community members) for Debian 7.0 release.
I believe, however, that Debian 7.0 will ship with both phpvirtualbox
and OpenStack, tested and documented. (in early 2013)
Debian 6.0 (stable) lacks those technologies.
-Alexey Eromenko "Technologov"