Adrian Chadd <> writes:

> I'd suggest "use whatever works". I use Centos 5.x since they use the
> latest "stable" xen patched kernel but its quite out of date.

If you want to make FreeBSD also run under the 3.0.3/3.1 hypervisor that
CentOS/RHEL use, that's great (I think ec2 uses the RHEL/CentOS foo, but that
is hersay.)   the newer Xen hypervisors all seem to support DomUs that
expect 3.0.3 hypervisors, so we should be good.

The RHEL5 installations will be out there for a while, and 'yum install xen'
is by far the easiest way to get a working Dom0. uses a (the one that comes with 
Xen 3.4) kernel and toolset on top of a CentOS 5 userland right now.
I moved off of the CentOS kernel because until recently it did not 
support paravirt_ops DomUs, and the RHEL Xen kernels are slightly less
stable than the kernels.  RedHat has made it quite clear that they
intend to replace all instances of xen with KVM.

So yeah, for me personally, I see NetBSD 5 as the 'way forward' in terms
of Dom0 operating systems, now that RedHat has publically stated that 
KVM should replace Xen in RedHat products (which is weird, because
as far as I can see, while both are fine products, they are not even
remotely substitutable.  KVM would be a silly idea for to use
for hosting, and Xen doesn't make sense if you just need to spin up
a dev box every now and then.)  Currently NetBSD uses the Xen 3.3 hypervisor,
and it supports modern hardware.   (really, the kernel
from, which I currently use in production is mostly okay, 
especially as the socket F boards havent changed in some time.)  

I started with FreeBSD Jails, and moved to NetBSD/xen2, and only left
because of the ram limit.   Now that NetBSD 5 is out, I think it's time
for me to switch back.

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