QEMU stands for "Quick EMUlator" and is a processor emulator that relies on dynamic binary translation to achieve a reasonable speed while being easy to port to new host CPU architectures.

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FVD format on qemu/KVM

How can I install this format in Centos KVM?. Is it included in latest qemu versions? Reference in qemu wiki: http://wiki.qemu.org/Features/FVD Thanks in advice
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Host Websites on Virtual IP VMs

I have Proxmox Virtulization server installed. But i have one real(Public) IP. Incoming request to Proxmox server must be bind Virtualized servers. Dnsmasq installed in Proxmox Virtualization Server. ...
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QEMU-KVM Linux virtualization on the command line

I recently discovered that qemu-kvm has a very promising -curses option that, instead of starting an X window, will show a nice ncurses output from the guest suitable for managing a Linux guest from ...
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2answers
155 views

Managing a QEMU guest from the host's CLI

Can I manage a QEMU guest from the host's CLI? I'm coming from Xen and I liked the xm command. I'd like to shutdown the guest, attach PCI devices to it and so on. Is there a way? There's the QEMU ...
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1answer
984 views

TCP/IP performance tuning under KVM/Qemu

With more and more companies switching to public cloud services, I'm curious what you guys' thoughts are on TCP/IP tuning in the cloud. Is it worth bothering with? Given that you don't have access to ...
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671 views

QEMU virtual networking NAT

I'm trying to set up a virtual network as described here. These are my steps: ifup eth0 # uses DHCP brctl addbr br0 ifconfig br0 up 192.168.0.1 kvm ... -device e1000,netdev=tap0 -netdev ...
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4k views

Read/write access for passthrough (9p) filesystems with libvirt/qemu?

I have recently started experimenting with the support for passthrough filesystems in recent versions of KVM/QEMU/libvirt. Making the filesystems available for read access has "just worked", but I'm ...
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How to quit QEMU monitor?

I launched KVM VM with this command: kvm /kvm/hdd/v1/v1-1.raw -m 512 -daemonize -smp 2 -nographic -net nic,model=virtio,macaddr=aa:aa:aa:aa:aa:01 -net tap,ifname=tap0 -monitor ...
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1answer
673 views

Fault-tolerant KVM hosts

I'm going to create a simple virtual hosts infrastructure using QEMU+KVM. It is expected to be very simple, without clouds or any other cool things. Right now the only requirement is the ...
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356 views

Software for managing a cluster of KVM physical hosts?

I am looking for software recommendations for managing a cluster of KVM physical hosts. We are currently using virsh and doing just about everything by hand, and I would like to find a slightly more ...
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2answers
3k views

qemu-kvm/virsh: No network connectivity whilst using bridged networking

I'm having an issue with performing virtualisation via libvirt/qemu-kvm, in which my set up for bridged networking doesn't appear to be working correctly. I've followed every tutorial I can find and ...
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1answer
994 views

How to convert OpenVZ OS template to bootable image file?

My question is how to convert a pre-created OpenVZ OS template which are in tar.gz format (such as these) to an image file in order to be able boot it with other virtualization solutions such as QEMU ...
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79 views

virt-rescue for Ubuntu

I want to install virt-rescue on Ubuntu 11.10 or Ubuntu 10.04. It could not be found in the repositories. Where can I get it?
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1answer
249 views

freebsd iso install on KVM - timer freezes

Trying to boot freebsd iso on KVM/libvirt [debian host] Timer shows: 10 sometimes is 9 or even 7. and that's it, count down stops.. Found some information that it's a bug with newest qemu and my ...
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1answer
497 views

Installing and running a guest OS on KVM-qemu with only serial console access

I am trying to installing a bsd distro with virt-installer. With a Linux distro I used this: virt-install -n debian -r 1024 --vcpus=1 --accelerate -v --disk ...
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2answers
8k views

free up not used space on a qcow2-image-file on kvm/qemu

we are using kvm/qemu with qcow2-images for our virtual machines. qcow2 has this nice feature where the image file only allocates the actually needed space by the virtual-machine. but how do i shrink ...
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3answers
376 views

Store QEMU images in database

I have a task to store QEMU images in a database and thinking towards developing of the custom block device. Is this a good idea? Where is it better to start from?
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1answer
2k views

Qemu: can I set the serial number on a virtual SCSI device?

I'm using libvirt+KVM+Qemu on Ubuntu 11.04. I have some scsi devices like this: <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source ...
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1answer
495 views

Give a KVM Guest only access to OpenVPN

I'm in a kind of weird situation where I need to do the following: Connect an OpenVPN tunnel with static RFC1918 IPs (think of 10.3.3.1 for the server end and 10.3.3.2 for the client end) and have it ...
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10k views

Changing boot device for a QEMU-KVM virtual machine

I am trying to change the boot device for a VM. I go to the VM's XML file in /etc/libvirt/qemu and set <boot dev='cdrom' />. Still, it attempts to boot from the harddrive instead of the cdrom. ...
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1answer
2k views

How to add a serial COM port to Windows server 2008 using Linux + KVM + Qemu?

We are using Linux + KVM + Qemu with libvirt on our servers to manage virtual WIndows 2008 Servers. The Host is Ubuntu 11.04. The point is on one of our Windows server 2008 guest, we need to connect ...
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1answer
1k views

Set Mac Address in QEMU/KVM properties file

I'm trying to set the mac address for my virtual machine in the virtual machine properties file. The properties file '102.conf' currently looks like this: name: vm1.mydomain.com bootdisk: ide0 ...
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1answer
600 views

Maximizing throughput of virtual file systems

I've been using a QEMU system to build software. The problem I've been having is that the system seems to suffer from extremely slow disk access. This is not necessarily a problem as it's not really a ...
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1answer
1k views

setting CPU cache size and model for KVM guest

Is there any possibility to create a custom CPU model for KVM Linux guests, or at least to modify parameters such as cache size and model name? I know I can set CPU features, topology and pinning and ...
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1answer
944 views

qemu-kvm save and restore in different machines - Offline migration

I am using KVM in cents 5.6. I am trying to do offline migration between two machines. I have a common NFS server. I initially save the state of the running VM (on machine1) to a state file using : ...
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1answer
1k views

CentOS 5.4 No package qemu available

I'm trying to install qemu on CentOS 5.4(final) with: yum install qemu The result is: Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirror.steadfast.net * ...
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1answer
891 views

KVM / QEmu / Libvirt I/O lockup

Simple issue. I'm running 5 KVM/QEmu instances. the host machine is constantly freezing for about a half a second in every 5. Disk LED hints that it is disk write related. Host is FC14, guests of ...
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1answer
2k views

Libvirt command line arguments using xml config file

I am trying something similar to http://wiki.libvirt.org/page/QEMUSwitchToLibvirt#-s . This is my xml file : <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> ...
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1answer
294 views

I cannot see any files after running qemu-img convert

I have run sudo qemu-img convert box-vmware-disk.vmdk -O raw /dev/sda1. No error was encountered all seems to have ended ok, but when I open the hard disk I cannot see any files. I want to be able to ...
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2answers
208 views

virtual interface names in qemu/kvm

I have an image with a debian-squeeze installation and using that I created two overlay-images to boot two (nearly identical) virtual machines from. When I boot them up individually (connecting them ...
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1answer
955 views

Using qemu-kvm images with Mac OS X?

i am a big fan of qemu-kvm, i've several instances running on servers running ubuntu linux. I now wonder if it's anyhow possible to use a virtual server image on an Mac OS X machine. Either by running ...
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467 views

9p filesystem interacting badly with KVM savevm snapshot

I have a 9p mount inside a VM. I take a snapshot of the VM state with savevm <snapshot>, stop the VM, then restart it with that snapshot (with kvm -loadvm <snapshot>). When I try to ...
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665 views

Why is KVM Host server CPU utilization very high, when the windows guest is idle?

I have Win 2008 running on a Ubuntu 10.04 host using KVM/QEMU. The version is 0.12.3. Event thought the Win 2008 is idle (no updates, most services are turned off), on the host server one of the core ...
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2answers
831 views

is it possible to install qemu inside linux ami on ec2?

well i tried to install it but gont an error . kernel-2.6.35.11-83.9.amzn1.i686 has missing requires of mkinitrd >= ('0', '6.0.91', None)
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1answer
273 views

Guest Access in QEMU-KVM

I am having trouble in accessing my Guest OS running on QEMU-KVM. However, I noticed that the Guest OS is capable of accessing Host OS easily thru telnet; basically every IP address appear in ifconfig ...
2
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1answer
237 views

KVM QEMU looses USB devices

I have a KVM Qemu setup. I'm mapping a USB device to a VM running windows vista. I get the device mapped, and all is well for some time. Suddenly the device disappears in Vista. If I do "lsusb" in ...
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3answers
4k views

Convert directory to QEMU/KVM virtual disk image

I have a directory filled with data at /var/backups/disk1 that I want to convert into a virtual disk image which I'll then be able to boot using QEMU or KVM (the directory contains the file system for ...
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1answer
692 views

Error: running qemu on powerpc

I have installed qemu-0.13.0 on x86 system. I downloaded debian-powerpc image from http://people.debian.org/~aurel32/qemu/powerpc/ and used it with this command $qemu-system-ppc -hda ...
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3answers
2k views

How to migrate KVM based VMs running in LVM setup to Vmdk images

I am using KVM on Ubuntu Server 10.04. and Virtual Machines are running on it in LVM. I have to migrate some of them to Vmware server.How can I achieve this? I searched and came across some links but ...
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4answers
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Is it possible to run KVM over a qemu emulated powerpc architecture

I understand that qemu uses binary translation to emulate machines, so irrespective of the underlying architecture, it can provide emulation. And, KVM uses Hardware Virtualization technique to make ...
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1answer
448 views

How to install kvm in Debian (Lenny) over powerpc

I want to install kvm on debian(lenny). I have learnt that packages kvm and qemu-kvm are not available for powerpc architecture. I have found two packages(kvm-source & qemu) and installed it. Now, ...
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2answers
14k views

Difference between KVM and QEMU

I have been reading about them for sometime. As of now I have a clear understanding of what they do. KVM supports hardware virtualization to provide near native performance to the Guest Operating ...
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1answer
908 views

Run a KVM machine with qemu

I'm facing a strange problem. I thought that kvm was just a modified version of qemu for hardware acceleration. Now I'm trying to run a VM on different computers using qemu without acceleration. This ...
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1answer
778 views

libvirt, qemu, reboot hook

Is it possible to detect that the guest VM has rebooted and perform an action using libvirt / qemu? The hooks here only support the "start" and "stop" events. I would like to detect if my VM has ...
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1answer
185 views

Booting ubuntu with libvirt pass in custom script to be run from rc.local

I have an ubuntu image that I start under libvirt/qemu. I'd like to pass in a custom script at boot time that can be executed from rc.local. I can do this with Amazon EC2 instances via their ...
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How do I run a stable Windows XP kvm guest on Ubuntu 10.04?

I have three Windows XP guests running on a recently upgraded 64-bit Ubuntu 10.04 system. Occasionally (on the order of once every few days), one of the guests will become non-responsive and the kvm ...
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1answer
15k views

How to convert a raw disk image to a copy-on-write image based on another image for use with kvm and virt-manager?

I have a virtual Windows machine running on kvm. Presently it has a 90GB raw disk image. I would like to clone this VM without having to keep two copies of the 90GB raw disk image around. It seems ...
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1answer
647 views

Linux Virtualization Options on EC2

I need to subdivide EC2 (or perhaps other cloud provider) instances. I know you cannot run a full virtualization stack on another. For instance a Xen guest cannot host a VirtualBox guest. So this ...
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2answers
444 views

Internet Forwarding With Qemu?

I'm using kvm and qemu to run a windows virtual machine, but I'm trying to get internet on that machine. I've been reading about all this bridging and stuff that is done to do that, but I was ...
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3answers
5k views

libvirt and qemu/kvm -snapshot option

Using libvirt, I want to use QEMU's '-snapshot' option. That way, when the machine shuts down, all of the disk changes that were made get destroyed. Here is the manual for the -snapshot option: ...