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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mounting logical volume attached to vm while vm is running

i am experimenting lvm2 and qemu-kvm. and I want to share and ask some questions. at the end of there is appendix what i am doing. a logical volume on host is attached on guest host (vm) as vda. this ...
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24 views

virt-install fully automated install

I'm looking into ways of installing/deploying a VM completely automated (no user interaction). So far I have tried QEMU and virt-install along with QEMU. The issue with qemu is that injecting ...
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Run qemu in Ubuntu Server(inside VirtualBox) error [duplicate]

I'm running qemu for virtualization in my ubuntu server which is vm inside virtualbox. It reports such an error: Could not access KVM kernel module: No such file or directory. I did some digging ...
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21 views

Qcow2 images growing far beyond what they should

I am using ubuntu 12.04 and have seen this: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1025244 Our qcow2 images are growing far beyond what they should... with some of them growing to as ...
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33 views

Why ssh tunnel cannot create in the virtualbox or qemu with force mode (-f)?

I try on the dedicated server root@debian:~# strace -e open -f sshpass -p guest ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null guest@198.51.100.11 -C -N -D 127.0.0.1:22220 -f [pid ...
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51 views

qemu, kvm: Guest: No DHCPOFFERS received

I'm trying to set up a virtual machine (guest) wich should act as router (ubntu 14.04). The host is a CentOS 7 machine (4x LAN). The guest should get a public ip address over it's eth0 (guest), wich ...
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22 views

Create a new image from partition images

I have a faulty server from 2004 which the hard disk is about to die. It has 3 primary(107mb, 2gb, 10gb; boot-swap-data), 1 extended partitions. In the extenxdded partition, there lies 3 partitions, ...
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1answer
56 views

Linux QEMU issue with bridge network interface

I am trying to setup a bridge interface for one of my QEMU running on CentOS 7. I have below scripts for TAP interface running $ cat /etc/qemu-ifup ifconfig ens192 down ifconfig ens192 0.0.0.0 ...
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87 views

KVM does not boot with .iso disk images. Device or resource busy?

I've been trying to set up a windows VM on my Ubuntu box by following the linked blog post http://www.pugetsystems.com/labs/articles/Multiheaded-NVIDIA-Gaming-using-Ubuntu-14-04-KVM-585/ So I have ...
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1answer
43 views

why linux bridge shows 2 mac addresses for one qemu vm?

I am new to qemu networking and pretty confused about the following situation. I launched 5 VMs. Each connects to br0 through a tap device. I also have a dnsmasq listening on br0 for DHCP. The ...
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75 views

Guest-VM can only ping CentOS KVM host, cannot access anything else

[root@KVMHOST]# ifconfig br0 Link encap:Ethernet HWaddr 00:1E:67:6B:17:2F inet addr:200.200.100.54 Bcast:220.225.255.255 Mask:255.255.0.0 inet6 addr: fe80::21e:67ff:fe6b:172f/64 ...
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1answer
380 views

How can I change Qemu KVM machine architecture from 440fx to q35 with virsh edit or virt-manager

Still trying to get GPU passthrough working and decided to change machine type from older 440fx to q35 ie pc-q35 but if I do virsh edit on the config it refuse to save saying "PCI Bridges not ...
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1answer
292 views

Debian Jessie Qemu KVM GPU Passthrough to Windows Virtual Machine guest Virt-Manager error Bus PCI not found

I'm having problems with Virt-Manager not wanting to boot a VM and giving error: Error starting domain: internal error: process exited while connecting to monitor: char device redirected to ...
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76 views

libvirt / kvm guests take very long time to start after host reboot

Host system is CentOS 6.5 x86_64. I have setup an Ubuntu guest by following this wiki. The guest works, but: if I reboot the host, it takes a very long time (about 30 minutes on the last reboot) ...
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214 views

Convert VHD to use on QEMU KVM

I try to convert a .vhd file (VPC) and get this error. I tried different .vhd files without success. I tried also with a fresh exported VHD with disk2vhd and backup Hyper-V .vhd. qemu-img convert -f ...
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59 views

Enable SDL for KVM under CentOS 7

I'm trying to set up a VM in CentOS 7 with an SDL display, but every time I try to run it, I get the following error: Error starting domain: internal error: process exited while connecting to ...
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1answer
35 views

Connect to the text console of a running VM

I have a running VM with vnc disabled. This is the command running it: qemu-system-x86_64 -enable-kvm -name scratch -S -machine pc-i440fx-trusty,accel=kvm,usb=off -m 512 -realtime mlock=off -smp ...
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1answer
45 views

qmp-shell doesn’t recognize commands

So, there is a python script that allows to connect to QEMU monitor from a usual shell. I had to download a bunch of files from the QEMU source tree, and add -qmp unix:./qmp-sock,server,nowait to the ...
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2answers
126 views

unable to start the installation of a kvm win7 guest

I am using this command (using virt-install on a debian 7 host) to start the installation of windows7 guest OS. I have assembled the following from a plethora of sites virt-install --connect ...
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2answers
286 views

Guest networking not working on Debian Jessie Host server KVM with br0 bridged network

GUESTS networking not working at all. In other words guest can not ping host or lan gateway. I have br0 bridge already created, also brctl show that vnet0 was properly added by KVM to br0 on guest ...
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1answer
42 views

QEMU guest can access HTTPS sites, but not HTTP

So I'm configuring a QEMU guest on my Debian Wheezy server, using virt-manager. As guest I've installed Ubuntu 14.04.1 server. The server contains the following iptables rule: iptables -t nat -A ...
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2answers
41 views

Version control for virtual disk images

Is there any existing system for efficiently tracking the version history of a virtual disk image? Essentially, I have a disk image which is used as a "template" root filesystem for testing programs. ...
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1answer
79 views

Restarting the networking on the HOST makes GUEST lose connection

I am probably missing something but have a KVM virtualized HOST/GUEST setup. The GUEST is using a bridge (br0) on the HOST for internet connectivity. When I make a "/etc/init.d/networking stop ; ...
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2answers
71 views

Cut'n'paste between X11 Desktop and the virt-manager VNC graphical console of a Win7 VM guest on a Server

I have a licensed copy of MicroSoft Windows 7 professional installed and running as guest on my Linux server running qemu-kvm. This works just fine. But I was unable to figure out how to ...
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2answers
474 views

Windows guest on KVM/Qemu suffers horrible key lag

Host OS is Arch Linux with the following versions:- qemu 2.1.0-2 libvirt 1.2.7-1 linux 3.15.8-1 Guest OS is Windows 7 64-bit. This problem did not exist when I first created this VM and started ...
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1answer
425 views

How to speed up QEMU on Windows host?

We want to run our Ubuntu 64bit web server virtualized/emulated on a Windows 64bit host. Intended use is to distribute the VM to customers who might not have "elevated" or "admin" rights on the ...
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3answers
365 views

qemu.img: conversion of a VMDK image failed with error “invalid VMDK image descriptor”

I trying to convert a VMDK image (Windows installed) to RAW format with the qemu-img command. However, it is failing with the following error: $ qemu-img convert -f vmdk -O raw image.vmdk ...
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1answer
152 views

EL6/KVM guest dies with “pthread_create failed: Resource temporarily unavailable”

I've got a CentOS 6.5 x86-64 KVM server with a bunch of guest VMs of different breeds, mostly EL5 and EL6. However one and only one of them keeps crashing every couple of days with: pthread_create ...
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115 views

Importing an ARM qemu machine using libvirt

Context: I'm trying to virtualise a raspbian disk image using qemu so that I can easily use it with vagrant/puppet. The steps I've figured out so far are create a VM using qemu import this VM into ...
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1k views

Gnome Boxes on CentOS 7 with Windows 7 as a guest

I just installed CentOS 7 and tried to use Gnome Boxes to create some virtual machines. As long as I stick to other Linux distributions everything is fine. But I really do have trouble installing ...
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77 views

LibVirt (QEMU) Shutting down from inside guest

I am currently running LibVirt with Qemu on Debian Wheezy: Versions: libvirtd (libvirt) 1.2.4 qemu-x86_64 version 2.0.0 (Debian 2.0.0+dfsg-4~bpo70+1), Copyright (c) 2003-2008 Fabrice Bellard It's ...
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2answers
114 views

Migrating physical machine to KVM

I have a fairly old debian machine that I need to migrate to KVM-Qemu. What I started is to make a tarball of the root filesystem: tar -cpf rootfs.tar --exclude='dev/*' --exclude='proc/*' ...
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612 views

Any way to convert qcow2 to ovf?

In our application we are downloading a qcow2 image and after that we are supposed to import that as OVF. So any way to convert qcow2 --> OVF or qcow2 --> vmdk(using qemu-img convert) --> ...
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1answer
80 views

Installing libssh2 on debian

Hi I'm trying to install libssh2 for 64-bit. I'm using the following code for installation: cd libssh2-1.4.3/ export CFLAGS="-mabi=64 -march=mips64r2" ./configure --with-libz --with-libgcrypt ...
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1answer
64 views

How to start a new instance of QEMU based on the same image and snapshot?

I have a QEMU image (qcow2) with a snapshot stored in it. Right now I'm using libvirt to start it. However, I want to be able to run more than one instance of the same image+snapshot. I guess I can ...
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133 views

What could cause linux to reboot even though panic is not set

Bit of context. Few VM's running on KVM (SmartOS), using kernel 2.6.32.7 have been rebooting. Nothing in the Qemu/KVM logs to suggest it's a Qemu issue. Unfortunately while testing kdump i discovered ...
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72 views

Windows 2003 server on KVM. Device manager shows error for processor. What CPU should I emulate?

I have moved a Windows Server 2003 VM from VMware to KVM running on Ubuntu 14.04 LTS. It's working very well. The only thing that is not perfect is that Device Manager on the Windows guest shows the ...
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1answer
4k views

Linux Red Hat Resize VM resize2fs - Couldn't find valid filesystem superblock

I'm trying to increase the size of a Linux Red Hat Virtual Machine by 10Gig. This is just on a Test Server I created that I'm trying to figure out. I increased the VM by 10 gig with this command ...
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1answer
33 views

List all devices emulated for a VM

I have created a VM with the below command in qemu . (KVM enabled) #qemu-kvm -m 1024 -enable-kvm -hda /var/lib/libvirt/images/fedora.img NOW, VM is launched. I would like to know the exact devices ...
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1answer
116 views

Bridging is breaking the server: KVM configuration

I'm pretty new to networking and just can't get my head around this. I'm trying to setup KVM-Qemu so I can run some virtual machines. The instructions I'm following are telling me to use eth0 and ...
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1answer
98 views

How to mount a URL as a CD-ROM on QEMU?

I'm wondering if it's possible to specify a URL for the cdrom option on QEMU, and if so how would I go about doing that? Normally I'd mount an iso like this: <disk type='file' device='cdrom'> ...
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1answer
1k views

Qemu - Disk Type, SATA Controller Questions

This is not so much of a question asking for an answer as it is just looking for an explanation. Imagine the following scenario. I have a Windows 7 Laptop, Dell Precicion M4500 series, with an SSD ...
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2answers
491 views

Disable TCP checksum offloading on KVM virtual network

I have a virtual network for connecting KVM guests with the host. I need to disable TCP checksum offloading on this network. The ethtool works fine but I want to disable it permanently and I could ...
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1answer
1k views

How can I set up a VM of Solaris 11 / Sparc on Windows / x86 host? [closed]

I need to test a custom binary that was originally compiled for an earlier version of Solaris on Solaris 11. Being poor, I don't have a spare SPARC server lying around on which I can install Solaris ...
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1answer
78 views

Implementing hardware virtualization for custom hardware

When using QEMU/KVM there are certain network adapters that are supported and emulated. If one wanted to emulate the guest OS's original network adapter (e.g - a Broadcom interface that was present on ...
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1answer
178 views

Is there any complete tutorial for setting up a full QEMU-KVM from hypervisor to host through command line ? [closed]

I've found parts about how to use virt-install from scratch or almost like http://virt-tools.org/learning/install-with-command-line/ However I'm stuck at connecting to the VM through virsh once the ...
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1answer
302 views

KVM virtual machine boot messages

Just wondering if anyone knows of a way to stop the following boot messages with a centos 6.5 vm created with qemu-kvm When I start the vm there is a slight delay as the vm posts the following boot ...
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1k views

Why I can't save network changes with virsh?

I am trying to add fixed address to specific virtual host, therefor I closed virtual machine and used sudo virsh net-edit somenet. After adding line <host mac='52:54:00:26:61:22' ...
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1answer
178 views

QEMU's QMP to listen on same socket?

Is it possible to have multiple qemu processes (machines) to listen on the same socket? I.e. you have this identical part when starting qemu processes: -qmp unix:./qmp-sock,server,nowait --monitor ...
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142 views

Debian keymap changing with qEmu?

Here's the context : I have a Debian 7.3 as the host system (with LANG=fr_FR.UTF-8), on which I'm running virtual machines with qEmu (for educational purpose only). I've created a disk image on which ...