KVM is the Kernel Virtual Machine, a virtualization hypervisor built into the Linux kernel.

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What is the structure of Libvirt Qemu VM dump/save files?

I need to do some exploration of Qemu-KVM virtual machines physical memory (particularly I need to check the fact of the physical memory intersection). In order to do that I'm trying to save VM's ...
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KVM Domain not creating

While I am trying to create a new KVM Machine , I am getting the following error , Unable to complete install: 'Domain has not existed. You should be able to find more information in the logs' ...
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Wireless bridged networking in KVM. Why is it so complicated?

I've been using VirtualBox (and sometimes VMWare) for years and I've never had any problem with the virtual network adapters, no matter if the physical ones were wired or not. I also played some time ...
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KVM linux guest, 2nd HDD, LVM partition or whole disk

I've got a RAID 10 arrays on a couple of KVM host machines. The RAID 10 array is one big VG. I usually create a small LV for guest disk image storage then the rest of the VG I carve out as LVs to add ...
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How do I know that my virtual guest is using VT-x?

I know my cpu supports VT-x, but how can I check that the KVM guest machine uses it? My Desktop is CentOS running a Windows 7 guest. I'm asking because.. the virtual Windows 7 says I'm using a XEON ...
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93 views

Proxmox Master Node crashes

I've inadvertently discovered a Proxmox bug. I run a personal cluster of 4 nodes (a technology lab for giggles and gags). Each node has a Dell Perc 5i and 4 HDDs in RAID 10. The standard Proxmox ...
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CentOS 6 KVM host with CentOS 6 guests kvm-clock enabled major time drift

I have a CentOS 6 KVM host with CentOS 6 guests, all 64bit. The host syncs time from NTP and has remained bang on. All the guests have kvm-clock listed as current_clocksource but over the last 3 ...
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21 views

Proper way for setting general policy and firewall rules with libvirtd

I'm just struggling with the firewall configuration of our new KVM Host. I think by now I understand how libvirtd implements networking, but I'm missing a way to set some decent firewall rules. To ...
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188 views

Mageia - how do I setup a KVM for Windows gaming?

Okay so I setup a KVM using Virt-Manager, Iset it to 7443 out of 8GB RAM, Got it to emulate my CPU fully, everything worked fine, but I cant get my GPU to unbind from the host to the guest, So is ...
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156 views

Enable 9p filesystem type in Centos 6 virtual guest?

My question is linked to this one : http://stackoverflow.com/questions/17880460/mounting-shared-folder-in-kvm-vm-error-mount-unknown-filesystem-type-9p (but can't comment it) I have apparently the ...
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KVM Desktop Client cannot connect to www server

I have a KVM test set up on a workstation. All the instances are using macvtap and a bridge. I can access the web server running on the KVM from a physically separate machine by IP address or DNS ...
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VGA passthrough - Code 43 with KVM and libvirt on all AMD hardware

I've set up a system with an R9-270 and an ATI Rage (PCI graphics card, doesn't use radeon driver) on an FX-8320 and an ASRock 970 Extreme3 R2.0 motherboard with the intention of running Debian Wheezy ...
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1answer
105 views

kvm usb modem passthrough

I'm trying to set up a USB modem passthrough in kvm virt-manager. The host is Fedora 20. The guest is Centos 6 $ ifconfig wlp0s29u1u6: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether ...
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111 views

Install a basic CentOS VM on Fedora 19 with libvirt

I would like to install a CentOS 6.5 virtual machine on my machine, only with command line tools and basic networking capabilities, i.e a way to have http and ssh connections between the host (Fedora ...
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53 views

How to start a virtual machine filled with qemu-nbd?

I migrated a Windows OS (entire disk) to a virtual machine on another host (Debian with qemu and kvm). I used Selfimage to export the disk. On the host, first of all, I created an empty virtual ...
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128 views

How do I get my mouse back from qemu/kvm?

I'm running qemu/kvm on Debian testing x64 with this command: kvm -m 1024 -hda win7.img -cdrom win7x86.iso -boot d -net user but when I click inside the virtual machine, qemu captures my mouse and ...
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ssh local tunnel to VM

So, can anyone explain why this doesn't work? Everything from remote host (192.168.1.3): ssh -L 9000:192.168.1.2:80 login@192.168.1.2 elinks http:127.0.0.1:9000 and I can see a web page. other ...
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89 views

Can (and how) KVM use NTFS storage?

Using SL6.4, I am trying to create a new KVM virtual machine using virt-manager. When defining storage at default pool, it boots up OK. However, when trying to use storage located on external NTFS ...
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185 views

How to use VNC for gaming?

I was just wondering if it's possible to set up a windows 7 VPS/VNC server to be used for gaming on my local network. I have a macbook pro as my main computer, it doesn't quite have the horsepower ...
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Why do I see more processes in KVM than in OpenVZ?

I've got a 512mb Centos 6 VPS running on KVM. Now another VPS from a org. I manage is running on OVZ. When I type top on the KVM one, I get a whole list of all sort off processes. But when I do this ...
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156 views

KVM to Ovirt VM migration

I installed ovirt on a machine that was already hosting KVM virtual machines. I am now trying to migrate those VMs over to RHEV format, but I am receiving SASL authentication errors using virt-v2v. I ...
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342 views

Configuring bridge network in kvm (debian wheezy 7.2)

I am desperately trying to run untangle 10 as a guest in kvm. My host system is debian 7.2 My problem is that I am unable to configure bridges/(virtual)NICS which are successfully identified by ...
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143 views

How does KVM set its own netfilter rules?

I've been poking around with KVM VM's on Centos 6.4 and after some hair pulling and copious amounts of trying to break my desk with my head due to not having an internet connection on my VM's, I found ...
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410 views

One host, two virtual machines that cannot ping each other. How to solve

We have Virtual Machines operating within the KVM environment. We setup one as a dev server running Apache etc., and the other as a Windows development environment. The two environments are setup ...
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libvirtd not suspending guests

My guests, one windows, one linux, are not being suspended. I'm not sure why. Here's the output of systemctl, which looks wrong, but I've done systemctl start libvirt-guests && systemctl ...
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660 views

How to Add Extra Disks on KVM based VM

I installed Redhat 6.4 on KVM Server. Right Now there is only One Disk /dev/vda. Now I need to add extra Disk like /dev/vdb I tried adding New Volume but it is not showing when I do fdisk -l How to ...
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Bridging on boot causes system to hang

Whenever I set br0 to automatically start up on boot, it causes the system to hang - usually on a line that says something like "waiting 2 seconds for br0 to get ready" or "bound to x.x.x.x to br0 - ...
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210 views

Copying large file causes excessive swap

On a mid-class CentOS 6.4/64 server with 32 GB RAM, 3 TB free disk space, operating as KVM hypervisor, I start copying a 200 GB file to a destination in the same local filesystem. In fact, this file ...
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1k views

Viewer Connection to hypervisor host got refused

I used the inbuilt VNC-Viewer in the virt-manager to see the VM desktops. But now when I click the Play button in the VM Window to see the desktop of the VM named server1.example.com, I get an error ...
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438 views

How to check which hypervisor is used from my VM? [duplicate]

So I'm running a VM somewhere and want to know what hypervisor the host is running. Any way to check whether it's running KVM or in a container? The vm is running Ubuntu
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311 views

Can virtfs/9p be used as root file system?

Is it possible to use a folder shared from the host to the guest via virtfs/9p as the root file system inside the guest? Loosely related to my previous question: Can virtfs/9p be used to share the ...
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160 views

Can virtfs/9p be used to share the same host folder with multiple guests?

So far I have resorted to sharing host folders with the KVM guests via Samba. Now, reading up a bit on it, it appears that "VirtFS (Plan 9 folder sharing over Virtio - I/O virtualization framework)" ...
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KVM loss of data?

I'm planning to install KVM on Linux Mint. I heard it is possible to corrupt files and partitions. There are warnings here but I haven't finish reading it (I will tonight). There is also another ...
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73 views

Options to sync 16GB+ KVM images

Is there a software that sync KVM images in real time on ArchLinux? i have 2 HDD that configured as RAID-0 (for performance reason) and 1 HDD for backup i want to have a real-time backup images on ...
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Use virt-manager to share files between Linux host and Windows guest?

Is it possible to use "Filesystem Passthrough" virtual hardware option inside virt-manager to share a folder on my Linux host with my Windows guest? I found some tutorials for how to do this with a ...
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392 views

shared LVM storage between KVM virtuals

I'm messing around with KVM and different storage options for sharing between virtual machines. I have an LVM volume group defined as a storage pool for libvirt. I've defined a volume and attached it ...
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178 views

Resizing LVM within a in KVM-based VPS

I have a VPS (based on KVM, not sure which storage technology) for about two years now. It's mainly a learning machine, a utility proxy, or a seldom-used VPN gate, or whatever--no real work, no ...
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benchmarking ftp in 3 methods of virtualization

My Bachelor Final Project is about benchmarking visualization methods with ftp, web and mysql services: installing Debian on xen (para-visualization) kvm and lxc with equal resources config (equal ...
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3answers
563 views

How do I prevent time drift in a Debian guest on a CentOS KVM host?

I know I can install ntp in the guest, but my confused understanding of what I've Googled so far suggests this shouldn't be necessary. The Host is CentOS 6.3 and guest is Debian Wheezy, which seems ...
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Can I use Synaptics' output in KVM?

I have been looking at MenuetOS, a simple graphical OS written entirely in FASM. The only reason I don't actually use it is that its touchpad support is pure garbage: every time I try to run MenuetOS, ...
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415 views

How can I get kqemu or even just qemu to show up in virsh capabilities on CentOS 6.4?

I have a CentOS 6.4 box that I'm trying to set up a VM on to run WinXP. This box doesn't have VT, which may not be ideal, but I'll settle for less than ideal. Apparently I should be able to install ...
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1answer
142 views

virt-install error: install methods 'cannot be specified for container guests'

I was following the Dell RHEL VM guide but working on CentOS 6.4 i386/686, and got to the virt-install step. After correcting a typo, I went back and deleted the vm.xml file it was suggested I ...
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258 views

Connecting to KVM on a GUI-less CentOS 6.4 using MobaXterm

I followed the directions at this question: Installing KVM on CentOS 6.4 without GUI (yet) But I'm not sure which feature (there are many!) of MobaXterm I should use to connect to the KVM. On the ...
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605 views

virt-install complains “error: no such option: --network-bridge:br0”

I was following the directions here to set up a VM in CentOS 6.4 i386/686. But I'm getting this error: $ sudo virt-install --network-bridge:br0 --name vm1 --ram=1024 --vcpus=1 --disk ...
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Installing KVM on CentOS 6.4 without GUI (yet)

I've installed CentOS 6.4 from the 'minimal' iso, so it doesn't come with a GUI. Will this question's answer allow me to install KVM, or do I need to install KDE or X-server or something first?
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Samba test setup with only one physical box

I have CentOS 6.4 i386/686 installed on its own. I'd like to test out Samba 4 running as an AD DC. If I don't have another spare box to use in the lab, is it possible / does it make sense to install ...
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1answer
151 views

Emulate unplugging a network cable with qemu-kvm

[Background: I'd like to actually test How to take down a static network interface when not connected? ] I'm setting up a QEMU-KVM virtual machine using libvirt (via virt-manager). I put two NICs on ...
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177 views

Add new network interface to the kvm (Slackware is installed)

Installed slackware11 on KVM, which is controlled by virt-manager. I need one more network interface, so I added another one using the same model as was installed by default, and restarted the ...
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CPU usage of KVM

I have a linux host with 4 KVM linux guests. All the guest are pretty much idle, having a load of <0.1 inside the guest. Now, if I do a top on the host, each KVM process is using something about ...
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683 views

Install grub on LV container for VM

I'm having difficult time installing grub in LVM LV container for a VM. This is the partition table: # parted /dev/mgtvg/linux2os print Model: Linux device-mapper (linear) (dm) Disk /dev/dm-7: 129GB ...