virt May 2011

virt@lists.fedoraproject.org

24 participants
15 discussions

virtual machine 101??
by Paul Lambert 15 May '11

15 May '11

Been a virt testor for Fedora for a couple of years and use Fedora on my laptop. Though familiar with VM I am not an expert in any way as to how it actually works. My question is this; Does the VM engine emulate OS kernel calls or does the VM engine actually emulate the guest processor assembly language calls transforming them into equivalent calls to the host processor? How does KVM vs Qemu implement VM? VMware promotes application VM packages where the user application is packaged with the guest OS. This allows each application to reside in its own OS which allows for on demand maintenance, reboots, etc. At some point the difference between the way a VM emulates guest applications becomes blurry. How much of a reach is it to have just the guest compiled processor code that can lay directly on a host processor and execute as a quasi OS? The basic services of monitor, network, etc. could be spawned for each guest application but they all are layered on top of the host services just as the like the guest OS does. The reason I ask these questions is there are many companies in the control industry that continue to build their own proprietary hardware that is very expensive and if you what redundancy it is even more. Some of these devices sit on a small basic UNIX like OS, others may actually have a proprietary OS. Either way, what effort is required to develop a custom VM engine for such a system so that these types of applications could be virtualized and reap all the benefits of VM? In advance, thanks for you assistance. Paul

2 2

Any examples for virtual machines inside a DMZ?
by Tom Horsley 10 May '11

10 May '11

I've currently got all my virtual machines networked using the br0 bridge to make them all look like they are just other machines on my LAN, all in the same subnet, all using the same gateway, DHCP server, etc. What I'd like to do (for purposes of paranoia), is something like create another bridge, say br1, and through the magic of iptables and wot-not make any virtual machines I attach to br1 be completely isolated from my local LAN, but still get their network traffic forwarded so they can talk to the outside world. I know just enough to imagine this might be possible, yet have no idea how to implement any of the details. Are there any detailed prescriptions out there for doing this kind of thing?

2 1

DVD RW under KVM guest
by Radu Borsaru 05 May '11

05 May '11

Hi, (this is the third time I'm trying to post this thread; cc-ing virt-owner for help) I'm using Fedora 14 with KVM/QEMU virtualization. I have created a XP guest that is working fine. However it cannot recognize the DVD-RW that I have available for the host. It can only mount a read-only DVD (/dev/sr0). If I open the details for the guest VM I cannot untick the read-only box that I can find under the storage options (it is grayed out). Is there any way I can mount this DVD as a rewritable media? I was able to do this using Virtual Box and passthrough. I could not find anything about this under KVM (only PCI passthrough that is not an valid option). Regards, RaduB

4 7

Duual Monitors pitfalls?
by Frank Murphy 04 May '11

04 May '11

Am thinking of buying a second monitor, to use with the guests. Host on mon1 guests full screen mon2. Any experiences? -- Regards, Frank Murphy UTF_8 Encoded Friend of Fedora

2 1

f15 guest with spice and gnome 3
by Gianluca Cecchi 02 May '11

02 May '11

Hello, I'm testing an F15 beta guest running on an F14+virt-preview host. Is it correct to say that as right now spice doesn't support 3d acceleration, then my guest will only be able to run gnome 3 in fallback mode? In this case is there any emulated video adapter to configure with which I can test f15 and gnome 3 in its new desktop layout? Thanks in advance, Gianluca

2 4

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

virt May 2011