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)...
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4
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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 ...
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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 ...
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4
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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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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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3
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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 ...
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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 ...
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3
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1
answer
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Migrating from libvirt + iptables to libvirt + nftables
I'm about to migrate a Debian Stretch host using qemu-kvm to Debian Buster.
I've seen people complaining on the Internet about issues due to nftables becoming default in place of iptables and libvirt ...
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3
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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 ...
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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 -...
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3
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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 ...
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3
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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....
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3
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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: ...
user160910
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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 ...
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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 ...
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0
answers
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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.
...
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2
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756
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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). ...
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2
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1
answer
1k
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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 ...
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2
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1
answer
752
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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 ...
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2
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445
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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
...
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2
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362
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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 ...
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301
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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'...
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2
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0
answers
2k
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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 ...
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2
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0
answers
90
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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 ...
2
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1
answer
1k
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(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 ...
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2
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answers
333
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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
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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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0
answers
2k
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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) ...
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2
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1
answer
489
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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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2
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2
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682
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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....
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937
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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 ...
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2
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1
answer
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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....
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2
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1
answer
64
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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&...
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1
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0
answers
133
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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 ...
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1
vote
0
answers
92
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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 ...
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1
vote
1
answer
75
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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/...
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1
vote
1
answer
350
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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 ...
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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 = ...
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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='...
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1
vote
1
answer
220
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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 ...
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1
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0
answers
156
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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 ...
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1
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0
answers
106
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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 ...
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126
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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....
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1
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0
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75
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RTSP Stream Cannot Be Accessed from KVM Guest using NAT - iptables forwarding
How should iptables on the host be configured to allow rtsp:// traffic from a KVM guest that initiated the connection via a NAT network interface?
It doesn't appear to be a simple mapping. I don't ...
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0
answers
78
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How can I blockpull an inactive domain?
For active domain I can do virsh blockpull --domain ... --path ... --base ... I would expect the blockpull should also work with inactive domain since it should be even easier (there is no write ...
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1
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0
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179
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libvirt: how to use host OpenVPN connection
I have Ubuntu 22.04 with OpenVPN connection to remote network. I also have some number of VMs running on my machine. All of them are using one Virtual network to connect each other. Not all VMs ...
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1
vote
0
answers
461
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KVM start failed (ubuntu image)
KVM start failing after I have made the below changes.
Environment:-
qemu-img version 2.1.3
ubuntu VM
1. Stop the VM
2. qemu-img resize vm1.img +50G
3. start the VM
virsh start vm1
error: failed to ...
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1
vote
0
answers
88
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libvirt and dnsmasq does not allow to start Kea DHCP server
I have libvirt installed which instantiates dnsmasq process per each virtual bridge interface, e.g. virbr0, however for some reason I can't start kea-dhcp server on other interfaces in the system, ...
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vote
1
answer
4k
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How to auto redirect a usb device on virt-manager
How do I automatically redirect a USB device to a remote KVM? preferrably filtered by ID.
I have a KVM running on a server (QEMU+SSH), and the display protocol is Spice. How could I always redirect a ...
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1
vote
1
answer
673
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Terraform Libvirt - How to use local qcow2 file
i try to provision some nodes for a kubernetes cluster based on kvm and debian. I want to use the Debian 11 Genericcloud Image and clound-init to initialize it. So i put the debian baseimge to /var/...
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