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Questions tagged [libvirt]

libvirt is an open source API, daemon and management tool for managing platform virtualization.[1] It can be used to manage Linux KVM, Xen, VMware ESX,qemu and other virtualization technologies. These APIs are widely used in Orchestration Layer for Hypervisors in the development of a cloud based solution.

The virtualization API

libvirt is:

  • A toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes), see our project goals for details.
  • Free software available under the GNU Lesser General Public License.
  • A long term stable C API
  • A set of bindings for common languages
  • A CIM provider for the DMTF virtualization schema
  • A QMF agent for the AMQP/QPid messaging system

libvirt supports:

  • The KVM/QEMU Linux hypervisor
  • The Xen hypervisor on Linux and Solaris hosts.
  • The LXC Linux container system
  • The OpenVZ Linux container system
  • The User Mode Linux paravirtualized kernel
  • The VirtualBox hypervisor
  • The VMware ESX and GSX hypervisors
  • The VMware Workstation and Player hypervisors
  • The Microsoft Hyper-V hypervisor
  • Virtual networks using bridging, NAT, VEPA and VN-LINK.
  • Storage on IDE/SCSI/USB disks, FibreChannel, LVM, iSCSI, NFS and filesystems

libvirt provides:

  • Remote management using TLS encryption and x509 certificates
  • Remote management authenticating with Kerberos and SASL
  • Local access control using PolicyKit
  • Zero-conf discovery using Avahi multicast-DNS
  • Management of virtual machines, virtual networks and storage
  • Portable client API for Linux, Solaris and Windows

More infos:

556 questions
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virt-manager guest resize not working

Installed virt-manager, target virtual machine is debian jessie with spice-vdagent installed shared clipboard, and latency-free mouse input works Display: Spice Video: QXL Channel spice: spicevmc, virtio, com.redhat.spice.0 (confirmed /dev devices…
ThorSummoner
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What does "cpu_time" represent exactly in libvirt?

I can pull the following CPU values from libvirt: virsh domstats vm1 --cpu-total Domain: 'vm1' cpu.time=6173016809079111 cpu.user=26714880000000 cpu.system=248540680000000 virsh cpu-stats vm1 --total Total: cpu_time …
JoeM
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What is the difference between QEMU, KVM, Libvirt, and how to use with Vagrant? Are all 3 needed to work together?

I've used Vagrant with Virtualbox before but VB is not working on this computer so I thought I would try a different approach, but I can't quite make sense of this cluster of software, what their uses are individually and interdependently... I know…
user163831
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libvirt: fetch ipv4 address from guest

I am looking for a solution to fetch the ipv4 address or other metadata of a VM running on qemu/kvm with libvirt? I've also looked into ovirt guest agent and qemu guest agent, but I was wondering if there's a better/easier way to fetch this…
Jochen
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virsh list command not showing any domain

I am running Ubuntu 12.04 on a VM on Fedora 18 host using QEMU/KVM and libvirtd. Now, when I fire up the virsh and give list command, it doesn't show any domain running, though my VM is running quite fine. Any idea what am I doing wrong?
Pensu
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How to set boot order on KVM (libvirt/virsh)?

How would you set the boot order on KVM when using libvirt/virsh? (Either via config or command)
Bravo Delta
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`vagrant up` times out at "Waiting for domain to get an IP address..."

This appears to only happen when I'm using the generic/arch box. I've tried several ubuntu boxes and everything works fine. Host OS is Manjaro. It's freezing with output: INFO interface: info: ==> default: Waiting for domain to get an IP address...…
Eric Ihli
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why is virtio-scsi much slower than virtio-blk in my experiment (over and ceph rbd image)?

Hi I recently did a experiment of virtio-scsi over rbd through qemu target (for its DISCARD/TRIM support), and compared the throughput and iops with that of a virtio-blk over rbd setup on the same machine, using fio in the guest. Turnout the…
Zhaohui Yang
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How to get VNC port number using libvirt?

I set autoport=yes in a domain's("virtual machine" in libvirt) config file so the VNC port is assigned automatically in the run time. I need to get this port so I can connect to the vm from outside, but I can't find the proper API to do so. Better…
can.
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Does libvirt support clone qcow2 with copy on write

The format qcow2 support copy-on-write.detail about qcow2 is here. Does libvirt suport clone qcow2 VM Image with copy-on-write. I find none options about: virt-clone
hellolwq
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Create multiple VMs based on single image

I would like to use libvirt to run multiple Domains (VMs) based on the same image at once. The image itself should not be modified. The image should be considered as a starting point or template. An obvious possibility would be to create a…
JojOatXGME
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libvirt and VirtualBox / Getting Started

I'm trying to get started on libvirt with VirtualBox as a virtualization solution. I installed everything and VirtualBox itself is running when using their VBoxHeadless command. However, libvirt fails to connect to VirtualBox: # virsh -c…
Marc Lucas
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go install github.com/dmacvicar/terraform-provider-libvirt@latest - shows error

I am trying to Provision VMs on KVM with Terraform. one of the steps in installations is to download and install the provider buy the command: go install github.com/dmacvicar/terraform-provider-libvirt@latest but it errors: The go.mod file for the…
Orly Orly
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Is it possible to run an ARM64 vagrant instance on the x86_64 host

I'm trying to run an ARM64 Ubuntu VM on an x86_64 host with vagrant for development purposes. I searched the vagrant box on their website only found this one:…
xiaogw
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what is the argument cpumaps and maplen in api virDomainGetVcpus of libvirt

I am trying to get the information of vcpus running on my machine and for the same I am using libvirt. I am not able to understand how to use the api virDomainGetVcpus which has arguments cpumaps and maplen. I am using C. Please let me know if…
Walt Whitman
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