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Questions tagged [libvirt]

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: What is stored in var/lib/libvirt/qemu

My Question is "What is stored in the /var/lib/libvirt/qemu folder?" Is this used as somekind of backup folder ? Backgroundinformation: I have a Debian Server with a running KVM installation(+libvirt)...
KVMUser123's user avatar
4 votes
0 answers
3k views

How to set Rx Queue = N in linux / in Qemu / KVM?

I have configured 8 multiple queues on my CentOS VM box (running on KVM). <interface type='direct' trustGuestRxFilters='yes'> <source dev='ens113f0' mode='passthrough'/> <model ...
Brijesh Valera's user avatar
4 votes
1 answer
7k views

Remove libvirt's dhcp lease entry using virsh

Using: $ virsh version Compiled against library: libvirt 1.3.1 Using library: libvirt 1.3.1 Using API: QEMU 1.3.1 Running hypervisor: QEMU 2.5.0 $ $ $ lsb_release -a No LSB modules are available....
Amir Keibi's user avatar
4 votes
0 answers
2k views

Libvirt & USB Hub Passthrough

I have a virtual machine which I wish to have a USB Hub and all of its devices allocated to a virtual machine. The Hub in question is a USB hub which itself is plugged into one of the ports on the ...
Ryan Walmsley's user avatar
4 votes
1 answer
432 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 ...
HoverHell's user avatar
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4 votes
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3k 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 ...
Daniel Huger's user avatar
3 votes
0 answers
846 views

Apparmor and libvirt - warnings and errors

I have a fresh Debian 12 installed and updated. Along with Cockpit and Cockpit virtual machines. I am getting the following errors and warning when looking at the log section in Cockpit: Failed to ...
Clicker85's user avatar
3 votes
0 answers
4k views

how to allow outgoing traffic with firewalld / libvirt on CentOS 8?

I installed a CentOS 8 guest on a CentOS 8 host using libvirt. However firewalld is blocking all outgoing traffic from the guest to the internet unless I use target=ACCEPT for the libvirt zone. The ...
Felix Schwarz's user avatar
3 votes
0 answers
3k views

Windows 10 KVM guests cause Ubuntu 20.04 host to crash (revised)

I got extremely confused and decided to re-write the question from scratch, so if some of the comments do not make sense, that is why. Apoplogies to anyone whose time I wasted. I am having a problem ...
Stonecraft's user avatar
3 votes
0 answers
4k views

Delayed start for Guests KVM/libvirt

Looking for any pointers anyone may have to introduce a delayed start for KVM guests i.e. 30 seconds between starting each virtual server rather than starting them all at once which thrashes the disks ...
Backtogeek's user avatar
3 votes
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How to provision DRBD to libvirt storage pool?

I want to expose DRBD replicated storage (2 nodes Active/Passive) to libvirt as a storage pool for qcow2 files. However, I have the following error message: virsh pool-create-as qcow2 --type=logical -...
Alexander's user avatar
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3 votes
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Libvirt LXC leaked processes

I'm trying to run several lxc containers on an ubuntu 16.04 server. (libvirt version is 1.3.1). The nature of my team's use of these containers means that they are constantly booting and then being ...
SwampDragons's user avatar
3 votes
0 answers
1k views

OpenVSwitch with Libvirt

Here's my situation: I'm running CentOS 7 with Openvswitch and Libvirt/Qemu. My domains are configured to use the virtualport type openvswitch, so when I start a VM it creates a port in the ovs bridge....
user165222's user avatar
3 votes
0 answers
3k views

qcow2 Disk size much bigger than virtual size

What would cause this? ls shows the qcow2 to be 241G, in the VM it only has ~ 160 GB drive, no unpartitioned space. Win 7 VM, Host = EXT4 2.6 Kernel virsh 0.9.10 file format: qcow2 virtual size: ...
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3 votes
0 answers
2k views

How to config libvirt network setting about disabling dnsmasq "except-interface=lo"?

Here is the thing. My VMs run with libvirt and use default network libvirt-provide, and I've mad each VM registers its hostname to dnsmasq set by libvirt. so I want to look up its hostname for ...
Chen OT's user avatar
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3 votes
0 answers
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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 ...
Lee Hambley's user avatar
2 votes
0 answers
976 views

AppArmor issues with Libvirt

I have a fresh Ubuntu Server 22.04.3 and Debian 12.1.0 installed and updated. Along with Cockpit and Cockpit virtual machines on both tests machines. I am getting the following errors and warning when ...
Johannes's user avatar
2 votes
0 answers
218 views

Connect (create ethernet link) between two VMs using their assigned SR-IOV Virtual Functions (VFs)

I have two KVM virtual machines created on RHEL9. I partitioned an SR-IOV-capable Physical NIC such that I was able to get Virtual NICs (Virtual Functions) from it. For each VM, I assigned it a VF. ...
Mo Fatty's user avatar
  • 121
2 votes
0 answers
1k views

qemu-kvm snapshot creations are extremely slow after a few first fast ones

Could anyone help me on this please? behavior I'm running several VMs with qemu-kvm and when creating some first few snapshots of a running VM, they are created super fast (roughly 10 seconds). ...
steffres's user avatar
  • 101
2 votes
1 answer
2k views

libvirtd eating up to 100% CPU with no apparent reason

Few days ago libvirt has started to behave erratically on my laptop. It consumes a high amount of CPU without any apparent reason. ALL my VMs are shutoff, why is libvirt using up to 100% CPU if no VMs ...
DavidEG's user avatar
  • 169
2 votes
0 answers
278 views

Howto set a host virtual interface (failover) to a vm in kvm+libvirt?

Have a Ubuntu Server 20.04 and 2 address, one in eno1 interface with first default public address and a failover with second address. I can create a virtual interface using a netplan called failover1 ...
e-info128's user avatar
  • 183
2 votes
0 answers
306 views

Cannot install virt-manager, python dependencies

I have a debian 11 machine, I installed KVM on it, and I would like to also install virt-manager, but I got : The following packages have unmet dependencies: python3-libxml2 : Depends: libpython3.7 (&...
Luthing's user avatar
  • 21
2 votes
0 answers
181 views

How to ensure that the changes in domain XML spec in libvirt takes effect?

I followed this host port forward with qemu through libvirt in user-mode networking answer to accomplish a certain task but it was only after a reboot that the ports were actually accessible. I tried ...
Akashdeep Dhar's user avatar
2 votes
1 answer
972 views

Wildcard CNAME record specified by libvirts dnsmasq:options namespace doesn't work, only specific subdomains works

Since v5.6.0, libvirt added a dnsmasq namespace with the element, which allows to specify options directly to the underlying dnsmasq server. I'd like to create a wildcard DNS entry for my applications ...
Lion's user avatar
  • 528
2 votes
0 answers
855 views

How to diagnose and fix issues causing libvirt guests to become unbootable after many reboot cycles?

I have encountered a couple of times that a previously functioning Guest simply starts freezing on boot. (I have now reverted my VM to a previous working snapshot, so I cannot directly start up the ...
user9794's user avatar
  • 121
2 votes
0 answers
452 views

Virtual machine network issue with host and ping service checks (within Nagios Core and from command line)

I have got a Ubuntu server guest virtual machine (installed via virt-install) which runs Nagios Core monitoring but there is a major issue with the monitoring (i.e. ping packet loss / RTA or ...
2one's user avatar
  • 141
2 votes
0 answers
352 views

Libvirt lxc-enter-namespace with mapped uid/gid

I'm trying to implement LXC with mapped uid/gid (user namespace) under Libvirt on CentOS 7 with full separate root mounted. Libvirt config snippet <idmap> <uid start='0' target='100000'...
Dima's user avatar
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2 votes
0 answers
3k views

XP KVM stuck at "Booting from Hard Disk"

Just to see if it could be done (and if so, move other physical XP machines to VM environments), I took the hard drive out of a decommissioned laptop, captured a WIM of it, and applied it to a QCOW2 ...
user38537's user avatar
  • 293
2 votes
0 answers
3k views

KVM guest gets into paused state shortly after being started

I have two very similar x86_64 machines running the same kernel (4.7.8), and the same version of libvirt. The only difference between the two machines is the amount of memory they have, machine A has ...
igalvez's user avatar
  • 39
2 votes
0 answers
101 views

Convert VM (redhat virtualization 3.5) to a physical server

I have a virtual machine running on red hat virtualization 3.5, i need to convert that VM to a physical server. (mainly due to a performance issue) my volume groups as follows NAME ...
Tharanga Abeyseela's user avatar
2 votes
1 answer
1k views

(KVM on Centos 7) Cannot ping to Guest or vice versa with single NIC Host

I have single NIC Host on Centos 7, which I want to make virtualization using KVM-Qemu. HOST The Host IP is 192.168.1.110 and the interface is enp0s31f6 I have deleted the "default" NAT ...
Rizary's user avatar
  • 21
2 votes
1 answer
2k views

How can I add a usb device to a domain xml from an image file?

I don't (repeat DONT) want to passthrough a physical usb device. I'm making a usb img file like so: dd if=/dev/null bs=1K of=/tmp/test_usb.img seek=2040 mkfs.vfat /tmp/test_usb.img I am then ...
d0c_s4vage's user avatar
2 votes
0 answers
401 views

noVNC console on Openstack Dashboard is rendering garbled UI on RHEL7

I am running nova-compute on RHEL7. Openstack dashboard's noVNC console is rendering garbled UI for any instance having a UI console. Can somebody please help out? This is working just fine on RHEL65
Abhishek Srivastava's user avatar
2 votes
0 answers
997 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 ...
stenio's user avatar
  • 173
2 votes
0 answers
2k views

libvirt / kvm guests take very long time to start after host reboot

Host system is CentOS 6.5 x86_64. I have setup an Ubuntu guest by following this wiki. The guest works, but: if I reboot the host, it takes a very long time (about 30 minutes on the last reboot) ...
Matt's user avatar
  • 1,047
2 votes
1 answer
532 views

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 ...
LittleFox's user avatar
  • 166
2 votes
2 answers
728 views

libvirt (KVM) inventory application?

I've got a bunch of LibVirt-managed (locally using virsh) KVM VMs on standalone Linux hosts (local KVM, local storage). Is there any web-based application out there that will track the inventory - i....
Jason Antman's user avatar
  • 1,536
2 votes
0 answers
1k views

KVM .img can not boot after resized by virt-resize

I have a CentOS 6.4 image install by KVM on Ubuntu 12.04 amd64 host. Here is the disk layout of centos.img # virt-filesystems --long -h --all -a centos.img Name Type VFS ...
tungns's user avatar
  • 113
2 votes
1 answer
745 views

can't ping/ssh new libvirt instance

I have a working virtual host that was Ubuntu-Server Lucid (10.4). I've been using it for a while and has several functional guests created on Lucid. Today I upgraded to Maverick, then to Natty (11....
jsharpe's user avatar
  • 131
2 votes
1 answer
79 views

libvirt lxc container won't use statically assigned address at startup

I have an LXC OS container (CentOS 7) configured via libvirt (CentOS 7): <domain type='lxc'> <name>lxc-test1.example.com</name> <uuid>5a715193-55ef-49d7-a4f6-ac5c27bce838&...
84104's user avatar
  • 13.1k
1 vote
1 answer
133 views

Set Maximum cpu qemu/libvirt almalinux

I want ask to increase supported CPU core on qemu kvm. When I creating new VM I see error like below error: internal error: QEMU unexpectedly closed the monitor (vm='ID'): qemu-system-x86_64: -accel ...
Hendra Setyawan's user avatar
1 vote
0 answers
239 views

Machine type issue when migrating KVM VMs with live snapshots from Debian to Ubuntu

I'm trying to migrate around 40 KVM VMs (containing a few hundred live snapshots mostly used for automated testing on Windows) from a Ubuntu 22 server to a Debian 11 server. The machine type of most ...
John Salazar's user avatar
1 vote
1 answer
136 views

new VM's won't complete after I moved /var/lib/libvirt/images to a larger disc

I have been building VM's on my fedora 37 server for a while, when I suddenly started running out of disc space. So, I looked in the filesystem and saw that the new VM's had their discs built at /var/...
Jason Michael's user avatar
1 vote
1 answer
726 views

How to use more then 2GB of ram when using running a nested BIOS VM using KVM

I have a Linux host running Debian 11 and on that host, I have a Ubuntu 22.04 VM. Inside that VM I want to run a Windows 10 VM using nested virtualization. The ubuntu VM is booted using EFI and nested ...
nezu's user avatar
  • 111
1 vote
0 answers
104 views

Virtualized Centos 7 on Ubuntu host: very slow I/O

I run a Centos 7 virtualized in Ubuntu 20.04. There is a huge I/O performance drop in the VM compared to the host. The host has plenty of RAM. Host: * MB/s = 1,000,000 bytes/s * KB = 1000 bytes, KiB = ...
Laurent's user avatar
  • 456
1 vote
0 answers
236 views

Backing encrypted drive

Creating a backing image for the master image that is encrypted using LUKS: qemu-img create -f qcow2 -b dev.qcow2 -F qcow2 -o encrypt.format=luks,encrypt.key-secret=dev --object secret,id=dev,data='...
Jonas's user avatar
  • 347
1 vote
1 answer
516 views

Forcing static IP on libvirt

I've seen this question and others online, yet my problem persists. I have a gentoo host with the following interface: virbr0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet ...
vesperto's user avatar
  • 220
1 vote
1 answer
429 views

libvirt virsh not using a predefined target while attaching interface

I am trying to automate the process of creating a Guest VM. I am using uvt-kvm to create the VM. I am also taking a network type as a parameter. This can be either nat or macvtap. Now in the script I ...
akarX_123's user avatar
1 vote
0 answers
160 views

How do I force Virt-Manager to use the hosts' llvmpipe renderer so the guests get to use 3D acceleration?

I'm using virt-manager and set "3D Acceleration" as per what was recommended, but I'm getting this error: qemu_gl_create_compile_shader: compile vertex error 0:2(10): error: GLSL ES 3.00 is ...
X.LINK's user avatar
  • 111
1 vote
0 answers
182 views

Assign outlet IP for a libvirt VM using routed network

My host network interface has got two IPs. Currently, I'm running my VMs in a routed network. Host's network interface is a member of public zone in firewalld, with both forward and masquerade enabled....
Yu Ling's user avatar
  • 13

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