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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:

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When I use libvirt api to migration,occur a error like this

libvirt.libvirtError: unable to connect to server at 'ccrfox112:49152': Connection timed out
Jiachang Guo
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libvirt/kvm/qemu: Is it possible to boot a Windows guest into safe mode?

I want to get Windows guest boot info, but I find the only way is to start windows in safe mode, and then there will be some file ntbtlog.txt under C:\Windows. Within kvm/libvirt, is it possible to run into Windows safe mode? How to?
coanor
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Ansible - Replace variable in kickstart file

I am trying to install several kvm's with ansible and virt-install using kickstart file. tasks: - name: Create VMs command: /usr/bin/virt-install --connect=qemu:///system --network network=default --initrd-inject=/tmp/anaconda-ks.cfg …
Igor Zilberman
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libvirt DHCP fails from host

I am having trouble setting up a PXE VM. It is sending DHCP requests and the server is sending responses, but the VM does not appear to be processing the response. I am unsure as to the cause. I did confirm physical machines are working just fine…
Dan
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Centos VirtManager Clone image - Device eth0 does not exist in libvirt

I up the Centos image using VirtualBox ,clone image and convert it into Qcow2 format and tried up using Virt-manager. But i found interface not available in VM. It displays "Bringing up interface eth0: Device eth0 does not seems to be present," I…
sujai M J
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Network bridge not routing traffic to the gateway

For context I have a laptop with a wireless inferface (wlan0). I want to add a tap interface and bridge the 2 together so that I can give internet access to a Qemu virtual machine. I understand I need to clear the ip config from wlan0 before adding…
Charlie Benger-Stevenson
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Different CPU capabilities

From where the cpu capabilites are exposed to libvirt VM's? We are able the see different cpu capabilities from different sources. We created a VM with cpu mode 'host-passthrough' which didn't get all flags that shows in physical node lscpu flags.…
user5016380
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libvirtd service fails to start after upgrade

After upgrading Centos,RHEL,Scientific Linux 7.3 to 7.5, KVMs fail to start due to the upgrade: 1.yum install -y,....updates and upgrades your Linux System With no questions asked "-y accepts everything and installs the packages" Then when you…
RobratZzI
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Easy ways to separate DATA (Dev-Environments/apps/etc) partition from Linux System minimal sized OS partition? Docker or Overlayfs Overlayroot? Other?

Back when the powers that be didn't squeeze the middle-class as much and there was time to waste "fooling around" etc, I used to compile everything from scratch from .tgz and manually get dependencies and make install to localdir. Sadly, there's no…
htfree
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How to access servers on a KVM guest like in VMWare?

I'm trying to establish a connection to my Guest without making it available for anyone else than my Host. When using VMWare Guests are automatically available under their NAT IPs (at least when using Windows as a host), which makes accessing…
user3499442
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How to run libvirt ubuntu headless mode?

I have created a simple vm ubuntu1604server using virt-manager on ubuntu1604desktop native. I can sucessfully run the vm with a window using the virt-manager gui, but I wish to run this vm in headless mode instead. Is this possible and how is it…
abstractx1
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How to take xml file of running instances in openstack?

Im trying to edit xml file of running instances in openstack but couldn't able to find out where it is placed . When i tried with #virsh list -all Which is listing some vms which is not created via openstack Please someone help me out to take xml of…
Karthigaa dass
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KVM bridged networking in a wirelss host

I'm learning about KVM networking and I came up with this question: When I set a KVM domain to use a bridged network (no NAT), I see that KVM (or libvirt) creates a tap0 having virbr0 as master in my case. Now, I don't see any other interface…
Dimitrius J
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How to install libvirt-go? (pkg-config)

Libvirt was installed with "dnf install". For libvirt-go - $ go get github.com/libvirt/libvirt-go. As a result: enter image description here How I can change PKG_CONFIG_PATH? Or how to install libvirt-go right?
D. More
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PHP script to create domain

Ok I want to create domain using libvirt-php.Here is the code. < ?php $credentials = array(VIR_CRED_AUTHNAME=>'root',VIR_CRED_PASSPHRASE=>'root'); $conn = libvirt_connect("xen:///", FALSE, $credentials);…
Ali R. Memon
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