libvirt is an API and toolkit for developing applications which manage virtual machine hypervisors, the virtual machines running under them, and virtual machine storage.

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Kvm Guest Network Unreachable

I have a kvm setup with several guest vms running ubuntu. For some reason I cannot get traffic through port 80 from the guests to the outside anylonger. The other way round works just fine, the ...
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293 views

libvirt vm cant connect to smtp

I have a problem with one of my virtual machines. In my Setup the kvm/libvirt hypervisor acts as the firewall and does all the NAT. There is 1 virtual network (virbr2) for all of the virtual machines. ...
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1k views

Fastest way to clone KVM VMs to be run simultaneously (create a branch VM)

IF I need to have concurrently running versions of a Windows VM (using KVM 0.10.2 on CentOS), each one configured differently ( a snapshot that will then branch off unto its own VM) what is the best, ...
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Ovirt doesn't create live snapshot

I installed oVirt. If I suspent VM and create snapshot it's ok, but if I try to do live snapshot on the stage "Finalizing" ovirt have fail. Ovirt, VDSM and NFS storages are on the same local server. ...
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378 views

Cannot start XML defined Linux Container, faulty cgroup mount

Using ubuntu 13.04 latest; i've installed lxc and various other tools Here's my XML definition: <domain type='lxc'> <name>vm1</name> <memory>500000</memory> ...
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330 views

How to create multiple clones of a VM in KVM/libvirt?

I (will) have a VM in libvirt (using QEMU/KVM) that I will set up and consider the "gold master". I would then like to be able to clone it 'n' times to create multiple systems. What is the best way to ...
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376 views

Changing the mac address in a libvirt xml config file breaks network connectivity for the guest

I'm using Xen with libvirt and trying to set it up on a bridged interface. I am able to install an OS and everything works as I would expect. If I save the xml output from "virsh dumpxml guest", edit ...
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254 views

Network traffic is not being forwarded from a VM to the network using a bridged interface with Xen + libvirt

I'm having trouble getting network access from a VM that I'm running using Xen and libvirt. I've been trying different things and reading similar posts online for a couple of days but I'm really stuck ...
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321 views

php-libvirt installation on centos fails

I am trying to install php-libvirt on centos 6.4 64x and there is an error in ./configure step: checking for LIBVIRT... configure: error: Package requirements (libvirt >= 0.6.2) were not met: ...
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835 views

Allowed cgroup devices for libvirt/lxc container

I want to allow my libvirt/lxc containers to use tun/tap device. In order to do so I for a running container I can add it to the allowed devices by: # echo "c 10:200 rwm" > ...
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388 views

Snapshot a KVM guest with non-file storage

I am preparing at least one Windows 7 guest on a KVM Linux (ubuntu) host. I have made an LVM-based storage pool which I would like to use. My main concern is snapshots. The disk-image will be ...
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372 views

virsh attach-device for serial device

I would like to add a serial device (console) to a guest via the virsh attach-device command. I have a console.xml file containing: <serial type="pty"> <target port="0"/> ...
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237 views

lvconvert --merge how to undo?

I have created a script for users who work on KVM virtual machines to be able to perform lvm snapshots on the logical volumes where their VMs are installed. Snapshot restores are performed via ...
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1answer
242 views

Debian Squeeze KVM - No Matter How I Setup Bridge, No Connectivity on Guest

I'm attempting to setup libvirt KVM guests on my server, and I've been messing around for two days now trying to get the guest networking working. So far, I haven't gotten anywhere. My network is ...
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1answer
120 views

KVM how to determine which virtual disk files are in use by VMs

I tried lsof|grep *.qcow2 and got no results back (why is that? I definitely have VMs running using that disk format). I also considered grepping qcow2 on *.xml within the config directory, but this ...
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2k views

Set startup order for KVM virtual machines via libvirt?

I have some server applications failing because their virtual machine starts up before the database virtual machines. Anyway to configure libvirt to start them up in a certain order and possible ...
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1answer
1k views

KVM/libvirt host has vnet for each guest?

Totally new to KVM here, so maybe there is nothing wrong with my set up, but I am running 10 guest VMs on my Ubuntu 12.04 server via KVM and I just noticed that ifconfig returned a plethora of ...
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656 views

Increasing the maximum amount of open files for libvirt

For an experiment I'm trying to start as many VM's as possible through libvirt, however with a little over 1000 VM's running I get an error saying: "Failed to create pipe: Too many open files". Any ...
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781 views

virtualbox to qemu but results in no bootable device qemu

I use vagrant to create my development vm. I exported the vmdk to vdi, and then convert the vdi to img. cd virtualbox_dir/test_vm VBoxManage clonehd test_vm.vmdk raw.vdi 0% ..... 100% qemu-img ...
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303 views

Apply libvirt nwfilter without editing of XML

Is it possible to apply libvirt's network filter to a KVM guest without manually editing the XML (for use in scripts)? Or is there any easy way of pushing the network filter configuration into ...
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2answers
4k views

Change VNC listen address in Libvirt without restarting VM

Is there a way to to edit the listen address of a Libvirt-Machine on the fly? At the moment it seems like when I want to edit the listen address, I have to shut down the corresponding VM first, then ...
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349 views

Technology for short-lived private VMs

I'm trying to build a system that will run short-lived (CI and test builds) of software components, it's mandatory according to my requirements that each live on a private host. I'm taking that ...
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581 views

Debian Squeeze Preseed Installation “The current kernel doesn't support the Logical Volume Manager. You may need to load the lvm-mod module.”

I'm attempting to install Debian Squeeze via an instalinux.com image pre-seeded with more or less default settings. (Only notable addition is the openssh server, which is a clickable option in the ...
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82 views

Domus Memory Used Issue With Xen On CentOS

Anyone know why I'm receiving this error? I compiled latest libvirt from source, I also tried with various rpm. I would like to get memory used by domus and it looks like it's not working with Xen 3 ...
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558 views

Different behavior of ubuntu-cloud image between LXC and libvirt-lxc

I've used ubuntu-cloud template as LXC containers, and they all worked fine. Recently I switched to use libvirt-lxc, and followed instructions in Ubuntu document, but the image initialized differently ...
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2k views

Guest system managed by libvirt doesn't start after successful installation

Host system — Ubuntu 12.04. Virtualization — KVM. Disks — LVM. Guest system installation was successful. But after restart: Booting from Hard Disk... Boot failed: could not read the boot disk ...
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1k views

Wake-on-lan to trigger virtual-machine with kvm and libvirt

I'm doing virtualization with KVM and managing via the Libvirt daemon. How do I start a virtual machine via wake-on-lan?
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391 views

Pacemaker cluster: Xen RA vs libvirt RA

Building a pacemaker cluster to manage Xen domU virtual machines the sysadm can choose between to different resource agents: the dedicated Xen resource agent (ocf:heartbeat:Xen) the libvirt based ...
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845 views

how to upgrade libvirt?

I'm trying to install openstack on RHEL 6.2. Following installation guide from openstack.org, I'm using the command: yum install openstack-nova openstack-glance After resolved many dependencies, I ...
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1answer
351 views

libvirt : Host - Guest can't get the correct route to make both pingable

I'am runing A Ubuntu server as a Host, and I've a CentOS guest hosting an oracle database. Everything was working just fine, until someone init 6 the server (What a great idea!). So I've to ...
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1answer
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KVM/Qemu, Ubuntu: Why do more guests CPUs enhance Disk-I/O rapidly?

We have an Heartbeat/DRBD/Pacemaker/KVM/Qemu/libvirt cluster consisting of two nodes. Each node runs Ubuntu 12.04 64 Bit with the following packages/versions: Kernel 3.2.0-32-generic #51-Ubuntu SMP ...
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Any way to release focus on a KVM guest in virt-manager without having to click Ctrl_L + Alt_L?

Is there a way to move my mouse in and out of a KVM guest in virt-manager without having to click to gain focus of the window and release focus by pressing Ctrl_L+ Alt_L? BACKGROUND I typically ...
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KVM and Libvirt - How do I hotplug a new virtio disk?

I am trying to hot-add a file-based disk to a running KVM virtual server. I've created a new disk from scratch using the command dd of=/home/cloud/vps_59/test.img bs=1 seek=5G count=0 and I was ...
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1answer
715 views

How do I prevent libvirt from adding iptables rules for guest NAT networks?

Similar to this old request on BugZilla for Fedora 8, I'm hoping something has changed since then or someone knows another way. I want to manage the iptables rules by hand—the one-size-fits-all ...
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1answer
947 views

KVM-qemu libvirt multiple interfaces in vms - how to control?

Running Ubuntu 12.04 we have 12 interfaces on the hypervisor which we want to expose in each vm. When we use only interface elements in the xml, we get the interfaces but we can't predict/control ...
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1answer
5k views

Adding Virtio block devices at runtime in Libvirt KVM

I'm running Debian Wheezy Beta 4 with KVM based guest systems which run the same operating system. I'm using LibVirt to manage the virtualisation. What I would like to do is to attach an LVM based ...
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libvirt upgrade caused vms to not see drives (boot media not found)

I upgraded to Ubuntu 12.04.1 and now libvirt (via open nebula) successfully runs vms but they aren't finding the 2 drives (specifically, the boot drive). One is "hd" the other is "cdrom". The machine ...
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3answers
255 views

Invoking a script inside a KVM guest, before networking is available?

With VMware's PowerCLI you can invoke a script inside a guest, even before the guest has network conenctivity, using the Invoke-VMScript Cmdlet (requires vmtools to be installed). Is there a similar ...
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216 views

listing of VM's created before libvirt installation or started by any other VM management tool

if my VM's are not created using virt-manager or are created using any other tool, then virsh system list command does not give them in the list of running VM's however they are running perfectly on ...
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162 views

lgcrypt not found while compiling libvirt

I am compiling libvirt. while compiling I got to install a lot of libraries which were appeared as dependencies. but I am not able to resolve the following error: linux/bin/ld: cannot find -lgcrypt ...
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393 views

KVM hypervisor remote access without libvirt

I am a newbie in the area of Linux KVM virtualization. Can anybody help how to connect to my KVM hypervisor from a remote Linux machine without using LibVirt or any other third party library. I have ...
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1answer
247 views

2xAMD Opteron 6128 with libvirt, Physical CPU 13 doesn't exist

I need help with libvirt(?) problem. Server specs: ProLiant DL165 G7 2x AMD Opteron(tm) Processor 6128 System: Debian GNU/Linux testing (wheezy) 3.2.0-3-amd64 libvirt 0.9.12-5 kvm ...
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1answer
126 views

Flexible virtualization infrastructure Design with libvirt

I'm going to install a CentOS6 Server with Virtualization ( libvirtd ) capabilities on a DELL Server with Hardware RAID5 of around 6T of disk space ( It has 4x2T disks in a PERC700 RAID Controller ). ...
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385 views

Using virsh to control KVM and openvz

On different servers I'm using virsh to manage openvz containers or KVM guests. No I have a server with both, KVM and openvz installed and would like to controll both with virsh. I can't figure out ...
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Accessing guests on virtual network when connected to host via PPTP

I'm setting up a development machine which runs Ubuntu 12.04 and KVM for virtualization. I have a guest running Ubuntu 12.04 which can be accessed from the host via its IP address which is assigned by ...
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34 views

List all files with specified selinux context

How do I list all the files with specific selinux context such as - 'system_u:object_r:svirt_image_t:s0:c332,c575' etc ??
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2answers
254 views

Measure the migration time

I am using KVM through virt-manager to test the performance in terms of migration speed on different types of network. However, I can't find any documents detailing on measuring the migration time. ...
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1answer
441 views

xen and libvirt bridge configuration

I have a Centos 5.5 server with Xen 3.2 and libvirt for virt-manager installed. Before installed libvirt I have the bridge configuration just like the documentation on Xen says: xenbr0, eth0 and ...
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4answers
273 views

Assign KVM VM to a user (KVM user authorization)

I would like to give my friend a VM on my dedicated server, and I want him to be able to restart the VM or change the iso - so basically I would like the same features as a VM hosting provider, e.g. ...
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3answers
4k views

KVM booting off-image kernel and existing partition

I am in the process of switching from Xen to qemu-kvm. My current Xen installation has a number of LVM volumes each with a partition (rather than a full disk image). In Xen, I start each VM with a ...