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.

166 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
4
votes
0answers
508 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 ...
4
votes
0answers
464 views

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)...
4
votes
0answers
1k 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 ...
4
votes
1answer
323 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 ...
3
votes
0answers
313 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 ...
3
votes
0answers
414 views

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 -...
3
votes
0answers
90 views

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 ...
3
votes
0answers
696 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....
3
votes
0answers
1k 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 ...
3
votes
0answers
980 views

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 ...
2
votes
0answers
75 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 ...
2
votes
1answer
294 views

How can I make my libvirt/KVM guest see all IPv4/UDP multicast traffic?

I have an issue with IPv4/UDP multicast traffic not being fully visible from within a KVM guest. The guest has a dedicated NIC which is attached using MacVTap. Both the host OS and the OS in the ...
2
votes
0answers
1k 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 ...
2
votes
0answers
82 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 ...
2
votes
1answer
856 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 ...
2
votes
0answers
227 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
2
votes
1answer
851 views

XFS/EXT4: Why is actual file size on disk larger than apparent size? Clarification

On a CentOS 7.1.1503 (3.10.0-229.el7.x86_64) system running KVM/qemu on an XFS filesystem, I'm attempting to work out what specifically is adding additional space to a VM diskimage file. $ ls -ls --...
2
votes
0answers
608 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 ...
2
votes
0answers
1k 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) ...
2
votes
1answer
268 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 ...
2
votes
2answers
572 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....
2
votes
0answers
2k 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: ...
2
votes
0answers
322 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 ...
2
votes
0answers
2k 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 ...
2
votes
1answer
716 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....
2
votes
1answer
48 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&...
1
vote
0answers
50 views

Fedora 32: KVM routed Bridge Network

I'm fighting with the following problem. I got an Hetzner dedicated Server with multiple additional IPs which I want to use for KVM VMs. (MainIP = 1.1.1.1, First additional IP: 2.2.2.2) Before my ...
1
vote
1answer
56 views

Terraform Libvirt - How to use local qcow2 file in the hypervisor instead of cloud images?

It seems like the libvirt provider only takes pre-defined cloud images. I create my own base qcow2 image that is local to the hypervisor and wish to use it as source file with terraform libvirtd. Is ...
1
vote
0answers
47 views

libvirt qemu AppArmor 9p hard links

I am using libvirt with qemu on a debian host. One virtual machine has a 9p mount point defined: <filesystem type='mount' accessmode='mapped'> <source dir='/mnt/pool/share'/> <...
1
vote
1answer
413 views

QEMU/KVM/libvirt macvtap VEPA not working - ARP request not forward

Hi I've been struggling to get guest networking working when using a macvtap in VEPA mode between two VMs on a host. I've spent hours (days) googling with no joy. Does this network configuration ...
1
vote
3answers
401 views

Can't port forward with iptables KVM NAT

I have a debian 10 host and I am running a debian 10 guest using NAT. I am using libvirt/KVM/QEMU host public ip: x.x.x.x guest ip: 192.168.122.99 I am trying to forward port 22221 to port 22 in the ...
1
vote
1answer
152 views

How to build a virtual machine in an encrypted container with virsh

I would like to use the volume encryption mechanism of libvirt. However, I was unable to find information about how to use this feature when running virt-install. How do I pass the related options? ...
1
vote
0answers
242 views

libvirt “default” network not adding correct IP address ranges to bridge “virbr0”

I'm running libvirt on ArchLinux using its default network with manually created nftables rules. I noticed that libvirt's DHCP server wasn't assigning IP addresses to VMs: journalctl -u libvirtd ...
1
vote
0answers
110 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'...
1
vote
0answers
928 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 ...
1
vote
0answers
585 views

libvirt connection as non-root user

I'm trying to configure a libvirt compute resource in Foreman and have both KVM and Foreman installed on the same Centos 7 host. Adding the compute resource with qemu+ssh://root@hypervisor.example....
1
vote
0answers
764 views

Setup routing in nested virtualization cluster on vagrant / hyper-v / libvirt

I'm trying to setup a specific VMs cluster using vagrant on my local notebook. I have a Win10 Pro with HyperV as a host. Unfortunately I cannot change it thus I want to create a Linux VM on HyperV (I ...
1
vote
0answers
160 views

Network data/bandwidth accounting on a VM's network from the host/hypervisor side (libvirt/KVM, bridged networking)

On a server a few KVM/libvirt virtual machines are running. Sometimes these use lots of GB in network bandwidth. I would like to do statistics on network transfers (bandwidth usage, ideally by IP ...
1
vote
0answers
69 views

Docker on CoreOS VM behind Corp proxy

I have Docker on a CoreOS VM which runs on top of KVM. VM Networking: $ virsh net-edit libvirt <network ipv6='yes'> <name>libvirt</name> <uuid></uuid> <...
1
vote
0answers
639 views

Centos 7 with libvirt, Kvm and balloon consumes 100% cpu on all versions of windows

Windows works perfectly, but the balloon does not work, after setting the min and max memory and activating the BLNSVR service, windows starts to consume 100% CPU. If put Min and max memory equal the ...
1
vote
0answers
2k views

KVM virtual machines won't work in bridge network mode anymore

Something broke on my KVM host (Ubuntu 16.04). I have some virtual machines configured to use br0 so they appear as separate machines on the LAN with their own IP. They get their IP from the router, ...
1
vote
1answer
2k views

KVM/Libvirt: How to make local DHCP leases available to local DNS server through dnsmasq

On Ubuntu 17.04 with libvirt 3.0.0 I have multiple virtual networks defined on my Server: # virsh net-list --all Name State Autostart Persistent ----------------------------...
1
vote
1answer
2k views

NATing through a vpn with libvirt

I installed a server with libvirt, and I've created a test VM. When I use the default network for it's interface, it gets a private IP and the NATing seems to work fine. I installed OpenVPN, so I have ...
1
vote
0answers
211 views

Unable to access vm guest running apache using macvtap behind router

Setup Host OS is Centos7 running libvirt. I have multiple guests running using macvtap as an interface to a bridged bonded interface (br0). br0 is a bridge of bond0, which includes two ethernet ...
1
vote
0answers
1k views

Disadvantages of creating a volume with lvm instead of with libvirt? Storage pool present

When creating the virtual machine on server A, virt-install created a libvirt-volume "VM" in the libvirt storage-pool "POOL". virsh-install --disk pool=POOL,size=$HDDSIZE,$DISKOPT -n VM As expected,...
1
vote
0answers
1k views

Ubuntu 16 KVM create bridge for multiple guests

RESOLVED IT, SEE EDIT AT BOTTOM I am running Ubuntu server 16.04.1 on a bare metal with multiple NIC's. At the Ubuntu I am running KVM and on it I have some VM's running Ubuntu server 16. I wish to ...
1
vote
0answers
382 views

KVM/libvirt: NAT forwarding virtual bridge to host bridge

I currently have a VM setup where only a few 'special' VMs are allowed to have outward facing IP addresses and the rest aren't. All of them are configured with two interfaces attached to a virtual ...
1
vote
0answers
320 views

Gentoo virt-manager IO throttling

I have a problem with virt-manager (or qemu/libvirt) installed on gentoo. Here is My virt-manager installed on Debian Jessie: There I have IO throttling but not on my Gentoo: I tried to search in ...
1
vote
1answer
754 views

CentOS 7.2.1511 libvirt firewall configuration

I have a few CentOS7 setups in which I use iptables to forward ports from host to guests. Recently, i updated to 7.2.1511 and it seems libvirt insists firewalld to be active vs using iptables command ...
1
vote
1answer
343 views

virsh net-define for CoreOS cluster

I have a kvm/qemu/libvirt host with several VMs running happily on br0 with IP addresses that are in the same network as the host they run inside, 192.168.10.0/24. So I'm playing with CoreOS and ...