So I got a Redhat6.2 and going to install it on a new IBM x3650 m4 server. However I want use Debian because I'm more familier with it. Since x3650 doesn't support Debian(I've tried but no luck), I plan to install Redhat6.2 as the base system and run multiple KVMs with Debian 7 in it.
Question: Redhat6.2 is the 2.6 kernel while Debian7 is kernel 3.2. So is it ok to run a 3.2 kernel vm in a 2.6 kernel host ?
Yes, you can, and here's why:
KVM is a so called full virtualization hypervisor, hence it simply doesn't matter what OS and what version of it you are running inside your VM. Basically, your VM and your Host only share hardware (ok, the Host fakes some of it to the guest, but you get the general idea).
As ALex_hha pointed out, problems would only arise when you're not using a full virtualization hypervisor; like OpenVZ, where higher-level sharing occurs; the kernel versions must be the same on both VM and Host.
Works fine; I've run VMs up to kernel 3.9.x in a KVM virtual machine on an EL6.4 host. Make sure you actually are running the current update of RHEL rather than staying back at a previous service pack.
It should be no problem, will be work. The problems could arise if you use openvz
it works just fine, lots of the RHEL KVM tests involve running fedora guests, where the kernel is even fresher
