Linux Kernel Virtual Machine is a virtualization system (VM)

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Use libvirt to configure KVM guest with user defined tap device

As far as I know, if we set up kvm guest OS with libvirt, it will automatically create bridge device virbr0, and tap device vnet0 which represents VM guest nic (and of course vnet0 is attached to ...
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Can KVM run on top of host OS?

I was interested in experimenting with Xen until I discovered that it has to be installed bare metal. Hence, if I have a Linux machine and want to use it to run a Xen hypervisor, I have to install the ...
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How to share the files between Virtual Machine qemu-kvm and host machine?

How to share the files between Virtual Machine qemu-kvm(windos7 installed) and host machine(Centos7 installed)? Thanks.
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CentOS 7 how to set guest port to jumbo packet automatically

I'm running libvirt on CentOS7. I have an internal virtual bridge setup. Only the guest virtual ports are members of the virtual bridge, and no physical ports are members of the virtual bridge. By ...
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kvm-qemu debian 7 pci passthrough Digium Wildcard TDM410 AMD M5A97

I am attempting to run a Digium TDM410 PCI card in a Debian 7 KVM Virtual machine. So I can have it connect to my analog phone lines 4 FXO and answer calls through my Asterisk PBX phone system I am ...
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touchscreen passthrough for windows 8.1 qemu slave

I have a windows 8.1 vm running via kvm/qemu on an ubuntu 14.04 touchscreen laptop host. I can pass use my touchscreen as a regular mouse pointer if i pass through -usb -usbdevice tablet in the qemu ...
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152 views

vga-passthrough with kvm/qemu on optimus-capable laptop

i have an asus n550jv laptop with the following output from lspci -nn | grep "VGA|3D": 00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core Processor Integrated Graphics ...
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How can I have different ip address on qemu vm with wireless host machine?

Because wireless doesn't support network bridge, I can't use bridged networking like virtualbox do. I'm running on arch linux with NetworkManager managing connection. Almost every possible way that I ...
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Linux (Mint 17.1) Video card's (R9 270x) sound is claimed by pci stub but the GPU isn't

So I'm trying to setup a gaming VM with on Linux Mint via KVM and VFIO. I've added the ID's of both the sound and the actual GPU but only the sound is getting claimed by stub. When I run dmesg | grep ...
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Mount or extract data from LVM partiiton inside of a RAW IMG File?

I have a raw disk .img file (running file indicates that it is a "DOS/MBR boot sector" file). Running mmls produces the following output: DOS Partition Table Offset Sector: 0 Units are in 512-byte ...
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(Virtual Machine) KVM/QEMU Distributed Resources

How do large VM hosting establishments offer Terabytes of RAM? Do they just use really large SWAP files? (over a Network FS of some type)? Or is it that they really have hosts/machines/computers ...
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KVM live migration i/o error

I have three Ubuntu Server 14.04 trusty with KVM. Two of them are HP servers and one is Dell. Both brands run fine the KVM virtual servers, and I can do live migration between the HPs. But I get I/O ...
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KVM accessibility from host machine

We have a KVM Host machine running multiple VMs. I am now tasked to create an instance with very sensitive data. Setting firewall and other OS specific settings is not the problem. Question is: can, ...
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Unable to get the Full screen in KVM

I installed CentOS 6.4 in KVM (Kernel-based Virtual Machine), My base machine is Scientific Linux 6.4. I am unable to get the full screen in KVM, In virt-manager if I select full screen also both ...
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How to change the disk interface type for my Windows 8.1 guest on KVM

I recently setup a Windows 8.1 VM with KVM and virt-manager. I initially set the disk interface to be IDE, but I'd like to change it to virtio. However, if I just change the interface in the ...
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104 views

Control fan speed under linux without nvidia drivers

I have quemu-kvm configuration like this - IGP on host (linux) and Nvidia on guest (windows). I blacklist nvidia drivers under linux (arch dist.). Is there a way to set GPU fan speed under linux ...
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No outgoing traffic through passthrough network adapter (NIC ) on KVM guest

I have KVM host operated under CentOS 7 and guest with Windows 7 on it. Host NIC is passed to the guest as PCI device passthrough (not bridge, not NAT). Guest detects the NIC (drivers, cable plug, ...
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Show qemu command line from virsh

I am debugging a problem with a libvirt VM starting, and I want to see the exact command line that it is going to use to start qemu. Is this possible using virsh or some other utility?
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194 views

FreeBSD KVM port maturity

What information is available on the stability and maturity of the FreeBSD KVM port? Please only share in-depth articles on why it would be stable, or why it wouldn't be based on real life ...
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OSX + X11 + KVM keyboard mapping

I'm ssh -Xing from my macbook air into a remote linux machine, on which I'm running virtual machines with kvm. Somewhere along the way, something is lost--it says I can press ctrl+alt to release the ...
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Cannot create a virtual machine on Fedora: Activation of org.freedesktop.machine1 timed out

I am trying to create a new VM within Fedora using virt-manager. However, I get the following error: Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line ...
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What happens when KVM virtual machines try to use the same core of a processor?

I have many virtual machines hosted with KVM on a single server. The problem(?) is there are now more machines then cores of the processor. From what I found I cannot use more RAM then I have but can ...
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318 views

kvm+vfio+vga passthrough, got “root.1” not found

I have a 64bit windows VM using KVM. I want to try VGA passthrough. I started my VM with: qemu-system-x86_64\ -monitor stdio\ -enable-kvm -m 2048 -no-fd-bootchk -localtime -M q35\ -bios ...
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Centos install using KVM stuck on trying to access install.img

Greeting Folks, I am trying to install Guest or DOMU on a remote server and every time I try is get stuck at Retrieving /install.img. I believe its a network setting but am not entrely sure. Here is ...
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Getting an already installed Android x86 partition to run on KVM

I have Android installed on sda3, and it boots fine when loaded from Grub with the following commands: set root='(hd0,3)' search --no-floppy --fs-uuid --set=root 977083a6-5762-4064-b860-39429b9e0cf8 ...
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I can't see apache, nginx process while using “top” command

As the title said: "I can't see apache or nginx process while I'm using top command" I'm using CentOS 6.5 and of course I already installed it on my server. I run them as a service by using these ...
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86 views

Correct location to configure a bridge using iproute2

I'm setting up a server for KVM virtualization and having a play with linux networking while I'm at it. Initially I'm aiming for a very simple bridged network set up where eth0 is enslaved to the ...
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I want to start VM for specific time

I am designing a system in which lot of VMs are there which run on KVM. My physical resources are limited, that is why I want to allow some of the VMs to run for some specific time(say Every Wednesday ...
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170 views

Install ubuntu on kvm in console

I use the following command to install Ubuntu server on KVM in a remote server using SSH console. But it seems that it does not recognize the iso image I provided as (a) it does not install without ...
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Unable to start VM from php

From a php page I am trying to start Virtual Machine using virsh tool on KVM hypervisor but I am getting this error. error: Failed to connect socket to '@/var/www/.libvirt/libvirt-sock': Connection ...
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is 3d acceleration possible in a win7 kvm guest? (host is debian 7)

I wonder if I can setup a windows 7 (64bit) kvm guest. I have only found some links for 3d acceleration in virtualbox guests, but nothing for KVM. Note that the host is a headless debian server and ...
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Why is [ssh,scp,rsync,etc] so slow, from a VM to another local machine on my gigabit local network?

I have a VM A running the latest archlinux with QEMU, KVM and a Virtio network card. It is a buildbot and it needs to drop the result on another machine B on the local network. The VM is started with ...
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Wrong modification times when saving on Samba share

I have a kvm virtual machine with Windows 8.1 with main purpose for Word/Excel and a bit of PowerPoint. Sometimes I save the virtual machine state and when turning it on again, the date and time of it ...
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338 views

KVM bridged networking issues

newbie warning: I'm completely new to virtualization so there might be an ridiculously simple solution to this... I'm trying to run a virtual machine with KVM on Ubuntu 14.04.1 LTS as host. For ease ...
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What's wrong with RHEL 6.5 on POWER in a PowerKVM guest?

I am seeing errors on two PowerKVM (Ver 2.1 SP1) systems on booting to the console of the form: irq: irq 4110 on host null mapped to virtual irq 27 BUG: Bad page state in process vballoon ...
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How to mount KVM virtual machine image to VirtualBox?

I have received a .img file of a server which is a Virtual Machine running in a KVM environment. The Virtual Machine has Ubuntu installed. I would now like to take this .img file and "emulate" the ...
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I wish to automate VM installation in KVM how do I?

I wish to automate VM installation in KVM. How do I do it? My setup is as follows: Host server: Ubuntu 12.04 64 bit RAM: 48 GB HDD: 800 GB CPU: 24 I wish to install Virtual machines using ...
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180 views

Enabling Intel VT-x on Vagrant guest

I'm running OSX Mavericks, and I know hardware virtualization is enabled. I have a debian VM in Vagrant with a virtual CPU that has support for hardware virtualization, but the vmx flag is disabled. ...
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qemu: How to use resolutions > 1024x768 in Windows 8(.1)?

In previous Windows versions, I was able to get higher resolutions in qemu/qemu-kvm by passing the -vga std or -vga vmware command line parameters. However, when I try the same for Windows 8 (and ...
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Virtual machines on Secure Boot

I have Fedora 20 installed with Secure Boot. I've been trying to make a virtual machine using OracleVM VirtualBox and VMware Workstation, but none of them work (vmmon couldn't be started). After ...
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How do I migrate a virtual machine using LVM from VirtualBox to KVM?

I have a virtual machine running CentOS on VirtualBox with a drive that uses LVM for partitioning / volume management. I need to migrate the vm to a linux-kvm host machine. Here's the steps I've ...
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Virtual machine - Sleep seems too long

I run a loop that does nothing except sleep for 1 ms and count the number of time it loops. In a KVM virtual machine, I get 500 loops per second, where I expect to have 1,000 loops. That happens with ...
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Weird output from linux `top` command

I got a weird output from command top, which shows the summation of the RES column is greater than my physical memory. For instance, I have a host with 64G physical memory and the swap partition has ...
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why do i get swapping even if i set vm.swappiness to 0?

I have a couple centos 6.5 x64 servers with 64GB ram running lots of kvm vps's. some of these servers have no swap usage at all and some do. I've set swappiness to zero. However some still swap even ...
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CentOS bridged adapter

I am looking for a way to have a bridged adapter that can also forward ports to different IPs for my virtual machines. For example: 192.168.1.101:3391 192.168.1.102:3392 192.168.1.103:3393 Does ...
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Mirror Port via iptables

I have a dedicated Linux (Debian 7.5) root server, with a number of guests set up. The guests are KVM instances, and get network access via bridge-utils (NAT, internal IPs, use the host as a gateway). ...
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KVM Arch install - no network

I often use KVM to try out various Linux distros. All I have tried so far get an automatic network, Red Hat and Debian have all connected out of the box, no problem. Makes installations very easy. ...
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What's the diffrence between snapshot-create and snapshot-create-as in virsh kvm?

On my virtualization system there are some VMs. One of them was aimed for testing some services on it. So in this case I need to have the first state of that VM. I searched for a solution found the ...
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Unable to get folder sharing to work under KVM Virtual Machine Manager

I've created an Ubuntu VM inside my Ubuntu using Virtual Machine Manager. I'm trying to mount a host directory in guest OS but it's not working. I used the instructions provided here: ...
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nova-compute libvirt x86_64 emulator Error

I was trying to install openstackin Ubuntu12.04 server. I find that Nova-compute is not getting started and the error is the below. I followed some of the suggestions in various forums, but nothing ...