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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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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Virt-manager performance over WAN… 40+ secs freezes

I'm using the virt-manager GUI 0.9.5-1ubuntu3 on my laptop running Ubuntu 14.04 against a server located some distance away (same OS) and getting rather unpleasant performance. Laptop-server pings ...
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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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1answer
16 views

libvirt NON TLS connectivity

virsh seems to require TLS even when tls is set to 0 in libvirtd.conf. I would prefer not to use TLS since I am working in an secure environment and as such TLS only adds complication, but doesn't ...
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LXC containers - Duplicate tty on Gentoo guest

I'm trying to run Gentoo inside LXC container on Centos 7 host machine. I have prepared the guest OS on another (Gentoo) machine by following this tutorial https://wiki.gentoo.org/wiki/LXC. On this ...
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1answer
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How to fix a frozen qemu VM?

I have a qemu hypervisor on RHEL 6.4 that hosts VMs that will quite often lose their connection to the network. When the VM has lost its connection I can view and interact with the it using ...
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1answer
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dnsmasq(as DHCP server) isn't working in KVM+libvirt envirmont

I'm using dnsmasq as DHCP server in VM environment. But It didn't working. I disabled basic DHCP feature in libvirt. <network> <name>default</name> ...
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1answer
14 views

libvirt management is slow under ubuntu

I've just done a fresh install of KVM/Qemu under Ubuntu 14.04.2 on an older (C2D gen) server with dual quad core xeons and 24 gb of ram. I'm finding that I'm waiting for operations in virsh for around ...
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1answer
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Remote automated provisioning to a XenServer Hypervisor

I'm currently working on a project where I use Vagrant with Ansible provisioning to create local environments in VirtualBox. I'm currently working with a University and we have a XenServer Hypervisor ...
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KVM GPU passthrough working only with cirruslogic vga added, VM goes in paused state if remove cirruslogic and boot with passed-through gpu only

It seems I had this working once but maybe that was when my kernel wasn't trying to load the fglrx kernel module. (I think before it was loading 'radeon' module) Not sure if this was the issue/change ...
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1answer
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apt-get update can not connect

i run a dedicated ubuntu 10.04 server. i use kvm/libvirt/virsh to run a virtual machine that's also ubuntu 10.04. i bridged the network (1 of 2 IPs is routed via NAT to the LAN, where my VM ...
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3answers
159 views

attaching usb dongle to KVM VM

I'm struggling to connect a usb device, that gets detected correctly by the host, to a kvm vm. I have a freshly installed Ubuntu Server 14.10 as KVM/QEMU host. I set up an Ubuntu vm using this ...
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2answers
885 views

upstart pre-stop script

I have libvirt/KVM set up on my Ubuntu and before shutting down the machine I would like it to attempt shutting down the VM's using an ACPI poweroff (virsh shutdown), then I want it to stop shutdown ...
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14 views

Prevent container from shutting down at console exit

As the manual clearly states, an LXC container automatically destroys (shuts down) itself when you exit the console. However, we're using these machines as servers (sshd, sometimes apache, ...) and I ...
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2answers
76 views

State of VM after 'virsh save'

virsh save vm_name memdump and then virsh restore memdump restores a (running) VM all right. However, a VM is shut off after virsh save. I'm writing a "live" backup and restore script for KVM VMs, so ...
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1answer
92 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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live-migration failure AND unable to launch an instance

I am having a trouble enablie live-migration in openstack. I follows the steps such as setting vnc_listen = 0.0.0.0 etc. ...
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1answer
34 views

Revert libvirt external snapshot

Having some issues understanding how to revert snapshots on ubuntu 14.04 using KVM... Until now i have been using internal snapshots, however due to space issues (space not being re-allocated after ...
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32 views

Virt-manager internal error: Network default is not active

Virt-manager is not booting up any more guest machines & it says, """Error starting domain: internal error: Network default is not active""". On looking at log file, it says ebtables not ...
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1answer
176 views

Network filtering with libvirt + xen + bridge + nat?

How can I properly add basic network filters (clean-traffic or, at least, ip-spoofing prevention) to XEN (xend) guests managed by libvirt? Or, in particular, can I manually execute libvirt's ...
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1answer
98 views

KVM unix socket file permission for VNC

I'm using kvm-qemu/libvirtd for a bunch of kvms. I'm using vnc for the graphical interface. By default, it listens on a tcp socket. I want to have it listen on a unix socket instead. Looking at some ...
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Get list of DHCP clients with KVM+libvirt?

I have several VMs running on Ubuntu 9.10 via KVM+libvirt. I want to be able to find out the IP address that has been assigned to each host without physically opening a physical "console" to each ...
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2answers
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How to measure boot time of a VM from host machine?

On both Guest machine and host machine, I am using Ubuntu 12.04. As a hypervisor I am using KVM. I want to perform some experiments related to boot-storm and I have created all other scripts to ...
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1answer
19 views

libvirt external snapshots: snapshot chain linked through filenames or inodes

If I have the following chain (it was created using external snapshots through virsh): base.qcow2 --> snap1 --> snap2[current] Now if I copy "base.qcow2" to a remote location, del the original ...
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109 views

Access to equally defined VM in different VLANs

I have a working libvirt cluster and in order to perform some paralellization I have duplicated it. At the moment my scenario looks like this: two clusters whose VM definitions are exactly the same, ...
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117 views

Backup KVM running machine safely

I read some solutions to make backups of running VMs, but all take offline snapshots that seems difficult that will work if the VM has high I/O load. I have tested but i have doubts about the process ...
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1answer
60 views

9p root filesystem using libvirt and QEMU

I'm attempting to boot a Linux VM with a 9p root file system using libvirt. This works perfectly when QEMU is invoked directly, using the following command: qemu-system-x86_64 -enable-kvm \ -kernel ...
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1answer
17 views

nova volume-detach fails silently, compute log shows libvirtError: invalid argument: no target device vdb

Using Openstack Havana, I'm trying to detach a cinder volume from a nova instance. Nova volume-list shows it as in-use: | 34b0ea26-f85c-4b62-8ebd-884b0e63e2d5 | in-use | filestore | 256 | None| ...
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78 views

How to configure and use qemu-guest-agent in Ubuntu 12.04? My main aim is to get the IP address of guest VM from Host machine

In the documentation it is not very clear that how to install and use qemu-guest-agent in Ubuntu 12.04. So can anyone help me out ? http://wiki.libvirt.org/page/Qemu_guest_agent It is a daemon ...
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1answer
121 views

Pass an USB hub from a KVM host to a guest with libvirt

I have the following USB devices on a Linux server: # lsusb -t /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/2p, 480M |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M ...
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Change sender-IP for VM in libvirt behind NAT

I have a server with my own public /28 IPv4 Network. On this server I have some vServers, done with KVM/libvirt. These vServers are connected with a virtual network, NATed to the internet. Every ...
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101 views

Force libvirt to pass always the same device number to the guest on USB device reconnection

I have a HP plotter connected with a USB cable to a debian server through a USB hub. On the server there is a virtualized Windows XP. Everytime I reboot the plotter a different device number is ...
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1answer
49 views

routing a second public IP to multiple VM's

myself and a friend have rented a dedicated server and have used KVM and libvirt to create virtual machines for us to use. (we are using debian jessie on the host) we purchased two additional IP ...
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2answers
321 views

Xen / libvirt - “End of file while reading data: Input/output error” when attempting to start a domain

I'm getting the following string of errors when I attempt to start a domain using virsh: virsh # start vimes error: Failed to start domain vimes error: End of file while reading data: Input/output ...
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1answer
195 views

Cannot add any virtio discs in virt-manager, how to fix?

I’ve just freshly installed virt-manager and libvirt-bin (and related packages) on a Debian sid system, and have a strange problem I’ve not yet seen on another similar installation: When creating a ...
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1answer
237 views

Installing a Windows guest with virtio in a single step (Debian)

I am trying to create a Windows 7 (32bits) with virtio disk and network in a single step using virt-manager. I've been trying to follow the step-by-step procedure here. However there is no such ...
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1answer
185 views

Running Vagrant/libvirt: trying to establish public/private networks

I'm running Vagrant 1.7 (from their official 1.7 packages) on Ubuntu 14.04 LTS and I'm trying to provision several private VMs and one public one. My Ansible provisioning scripts change all the ...
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1answer
126 views

libvirt and host firewall

Hiho! I'm using libvirt with kvm and that works great. My desire is to lock down the host system using a host firewall. Up to today I always used shorewall as my iptables mangement utility of choice. ...
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1answer
36 views

What's a good way to check KVM networking status?

I'm running several KVM with libvirt on a debian wheezy host. I want to check networking (maybe more later on) on the guests and if it is not available, restart the guest in question. Is there ...
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2answers
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Libvirt: ERROR No domains available for virt type 'hvm', arch 'x86_64', domain type 'kvm'

Installed virt-man like this $ apt-get install virt-manager $ modprobe kvm $ modprobe vhost-net Launching libvirt guest $ virt-install --virt-type kvm \ --name centos-6.5 --ram 1024 \ ...
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Changing qemu/libvirt default gateway IPv4 IP to something other than x.x.x.1/24

General info: I have a KVM-libvirt/qemu running on ArchLinux; 3.18.2-2-ARCH ls | egrep -i 'libvirt|qemu' libvirt-1.2.11-1-x86_64.pkg.tar.xz libvirt-glib-0.2.0-1-x86_64.pkg.tar.xz ...
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2answers
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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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kvm host server how to set limitation vps mail per hour

Host server OS Centos, virtualization libvirt. I need set limitation mail per hour on one VPS, it's possible from host server or need do it on vps ?
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mount a root disk in mnt

How can I mount a root virtual disk from another VM on my CentOS ? In order to change some files on it, not to use it as a real root disk. there are 2 partitions on my virtual disk : /boot (Linux ...
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1answer
68 views

libvirt - Restart VMs after return from power failure?

Is there any way to make KVM automatically restart any VMs that have been shut down due to power failure? Here is my scenario: I run a small VM tank, mostly with development VMs on it. I now have a VM ...
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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 ...
12
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1answer
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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
720 views

Access libvirt+KVM virtual machines with DNS

I have an Ubuntu Trusty machine running KVM + Libvirt to manage small virtual machines, and using the standard NetworkManager to connect to regular networks. I want to be able to access the virtual ...
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1answer
49 views

How to disable lbvirt network DNS

Is there a way to disable DNS in libvirt network? I want to have custom configured dnsmasq for local DNS caching but libvirt's dnsmasq holds 53 port.
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Why won't my libvirt VM communicate with apt repositories when wget and ping work?

I'm trying to use Vagrant and Puppet to make it easier to duplicate a multi-server setup for our websites. The recommended workflow is to vagrant up the puppetmaster server specifically first, and ...