Fri, 22 Aug 2008 08:25:10 -0400
Le August 21, 2008, Stephen Liu a écrit :
> > So you kind of allocate XYZ MB to each virtual machine
> > and
> > you roughly have to live with that commitment
>
> Please explain in more detail. On installing the software of virtual
> machine they don't request alloting XYZ MB RAM.
Since it is a virtual *machine*, you must define its characteristics, like how
much RAM, how many CPUs, etc...
With KVM you can overcommit, as with others I believe, ie for you 8GB machine
you can have 4 VMs with 4GB each; physical RAM will get used according to
each VM's usage.
> > Since the former are kind of complete machine emulations I would
> > assume
> > it's no problem to run vserver under a kvm/vmware image.
>
> If I understand your advice correct I can install vserver on the guest
> running on KVM/VMware image? A virtual machine on another virtual
> machine?
Yes, that's the way it is running here. And by the way, I have not measured
how much overhead the KVM layer actually incurs, but I was simply blown away
by the performance, compared to VMware Server which I have also used in the
past. Running speed is pretty near native now.
I would have preferred to run the vservers directly on the host, but there is
no official Linux-VServer enabled kernel in Ubuntu Hardy, and I don't need
the maintenance overhead of having to recompile a kernel every now and then,
so KVM it is for now.
--
Nicolas Cadou
Cobi Informatique Inc.
Tel: (450) 266-2420 (305)
Fax: (450) 266-2415
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