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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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same libvirt config, one machine boots, the other does not

I am migrating a bunch of vms from an old machine to a new one. The old one was using some in-house scripts and lvm logical volumes, the new one uses libvirt and plain files. The configs are rather ...
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1answer
205 views

Libvirt does not see updated LVM volume

All VMs run off an LVM pool. I resized one of the LVM volumes to increase VMs drive copacity. Resized it with lvextend as usual. Everything is successful and lvs shows the new size. Libvirt does not ...
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298 views

How does Qemu handle memory?

I'm having a real hard time understanding something and I was wondering if anybody has any experience with this and is able to help. I have two KVM VMHosts, one running qemu 2.4.1 and the other ...
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1answer
594 views

Correct virtio setup on Ubuntu 14.04 64-bit host

At the present moment, my guest is running inside qemu and host is kvm intel, running Ubuntu 14.04, kernel is 4.3.0 stable. From within the guest, when I run "hdparm -i /dev/sdb" on the guest, I get:...
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1answer
1k views

How to create a new domain from an existing base image in virsh

Is there a way of creating a domain with virsh from a base image? I have looked around and found that it is possible using virt-install, however I would prefer it if this was done purely through virsh,...
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1answer
740 views

KVM bad IO sync performance in Linux guest

I'm setting up virtualized Ubuntu 15.10 guest inside Ubuntu 15.04 server using libvirt and KVM. Storage in host system: # mount | grep ext4 /dev/sda1 on / type ext4 (rw,relatime,errors=remount-ro,...
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2answers
6k views

WARNING KVM acceleration not available, using 'qemu'

Running debian (Linux Rick 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u6 (2015-11-09) x86_64 GNU/Linux) Looking at my cpuinfo I can see I have vmx support: flags: fpu vme de pse tsc msr pae mce ...
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1answer
222 views

kvm snapshot-create-as failed

I have Ubuntu server with qemu/kvm. I'm try to create snapshot (for further backup) using libvirt and get this error: # virsh snapshot-create-as --domain 56 --name copy_snap --no-metadata --disk-only ...
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1answer
4k views

KVM guest cannot connect to host, but works vice versa

I have debian 7 on my host machine and I run a KVM vm on it. My hosts network configuration is this (the relevant parts): br0 Link encap:Ethernet HWaddr 68:b5:99:ae:8f:11 inet ...
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1answer
2k views

Libvirt guest destroyed after shutdown

I have created a VM withLibvirt and when I shut it down whether forcefully or with ACPI, it gets deleted. I create it: <domain type='kvm'> <name>deneme2</name> <memory>...
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1answer
232 views

Enabling Nesting for Xen-in-Xen via Libvirt xml

I'm trying to get nested Xen-In-Xen via libvirt. Can someone confirm that adding hap and nestedhvm to the features element in the domU xml config is what is required to get nesting working? Am I ...
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1answer
847 views

Backing up Xen Guests from dom0 with disk image file

I have a Xen server dom0 with a number of guests installed and am struggling to find an easy way to manage backups from the dom0 side. Guest scripts: Of course I could run backup scripts on each of ...
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1answer
1k views

how to enable L3 cache on kvm guest?

I start a kvm guest(centos6.5) on a Intel machine(centos6.5),use libvirt, the guest's xml as follow <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> <name>...
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1answer
196 views

Golden image updates in qemu

Consider that there are 100 windows virtual machines coming from a single base image and each vm is added to domain along with minor other machine specific settings which can be done by a script. ...
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1answer
96 views

KVM/libvirt: Guest monopolizes bridge

I'm having a problem in which the first guest started on a VM host can send traffic through both of its assigned interfaces, but subsequent guests can only send traffic through one interface. My VM ...
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1answer
305 views

Libvirt with Xen fails to start correctly Ubuntu 14.04

At the moment i'M really feeling a little helpless: I tried to setup Ubuntu 14.04 with Xen and libvirt for management. I created a VM but I did not auto-start (altough autostart is checked). If I do ...
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1answer
762 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 ...
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2answers
3k views

dnsmasq on virbr0 (libvirt) and network manager

I want to run dnsmasq on my local machine in order to configure a wildcard to resolve to 127.0.0.1 for testing purposes. However, when I went to start dnsmasq with systemd I got the following error ...
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1answer
41 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&...
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0answers
178 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
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1answer
593 views

port forwarding with libvirt

I'm trying to get port forwarding working through libvirt on top of QEMU and KVM. I found this article (https://snippets.webaware.com.au/howto/running-qemu-with-port-redirection-through-libvirt/), but ...
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2answers
1k views

How do I connect to my libvirt/qemu/guests ? (with no ip address)

I have inherited the administration of a trusty ubuntu server with several virtual servers, also ubuntu using libvirt and qemu. I have the problem I cannot connect to these virtual servers/guests. ...
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1answer
3k views

Best options for KVM/qemu/libvirt VM migrations without shared storage

My team has recently been tasked with improving the virtualization infrastructure at the company and one thing we're looking into doing is speeding up migrations. We use local storage only on all VM ...
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2answers
878 views

qemu-kvm take 100% cpu during start Win 7

I have Centos 6 with qemu-kvm version: qemu-kvm.x86_64 2:0.12.1.2-2.448.el6_6.4 On Dell Precision with 2x Xeon 5110 When I run VM qemu-kvm process take 100% of CPU and starting Windows on ...
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1answer
532 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 --...
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2answers
754 views

Forward Port on Guest Operating system With Libvirt

I am currently running a Xen Hypervisor underneath Ubuntu 14.04. On the host machine I am running a guest VM. From what I understand, In order to be able to receive incoming connections on the ...
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1answer
252 views

Installed KVM, but Virtual Machine Manager says localhost(QEMU)

My understanding is that KVM uses the CPU virtualization properties and is much faster than QEMU, which is emulation. I used the Virtual Machine Manager to create the virtual machine. I am nearly ...
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0answers
68 views

No package transfer from host to guest on KVM

I want to assign external static IPs to my KVM guests. I do not prefer a NAT solution. What should be the configuration of network and routing tables? I manually assing a static IP to guest. I can ...
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2answers
158 views

Can libvirtd be used without kvm?

I wanted to try libvirtd with virt-manager (I wanted to test migration.) on a virtual machine (without nested virtualization support enabled, so no kvm...), and I expected it to work (and use full ...
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1answer
105 views

Prevent hijacking IPs in KVM/libvirt

How can I prevent a VM user/client from accessing IP addresses he doesn't own but are routed over the same bridge on KVM/Libvirt? IP addresses are routed to a cisco switch vLan consisting of a /24 ...
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1answer
865 views

Is there any way to lock/unlock a Hosted Engine in oVirt?

I have a weird situation with my Hosted Engine in oVirt. We have an oVirt cluster set up using gluster as the storage for the engines isos and all the information. About a week ago two of the three ...
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1answer
3k views

Installing VM on CentOS 6.6 with virt-install hangs

I'm trying to install a Centos 6.6 VM on a CentOS 6.6 host with the following command. virt-install \ --name vm-queue \ --description "Queue Server" \ --ram 2048 \ --disk path=/var/kvm/images/vm-...
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2answers
2k views

Qemu+libvirt+kvm significant performance lag in VM's

I am troubleshooting poor performance on our new VM host machine which is a Dell PowerEdge R415 with hardware RAID. We've got about 20 VM's running like this: qemu-system-x86_64 \ -enable-kvm \ ...
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1answer
5k views

Unable to import Ubuntu virtual machine on Centos 7 kvm host

[root@kvm ~]# virsh create /root/ns1.jesse64.xml error: Failed to create domain from /root/ns1.jesse64.xml error: internal error: process exited while connecting to monitor: qemu-kvm: -machine ...
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1answer
769 views

Switching back to libxl from xend without rebooting

I did something dumb: I enabled xend over libxl and started an instance with xend. Now, libxl won't start any instances, even though I got rid of all the xend instances and stopped xend: root@xen1 [~...
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0answers
270 views

libvirt hook qemu suse12

we have this qemu hook. In suse 11 was working well but in suse 12 it is not working. The hook is setting the ports in openvswitch native-untagged. Do you know if there is some libvirt missing ...
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0answers
241 views

kvm guest routing with 2 default gateways

I have a kvm guest with two virtual NIC. NIC with internal IP III.III.III.III (eth0) NIC with external IP EEE.EEE.EEE.EEE(eth1) I'm using macvtap. The host has his own external IP. I can ping both ...
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1answer
825 views

Ubuntu Trusty: virt-manager performance over WAN… 40+ secs freezes

I'm using the virt-manager GUI 0.9.5-1ubuntu3 on my laptop running Ubuntu 14.04 against a server located some distance away (same OS) and getting rather unpleasant performance. Laptop-server pings ...
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1answer
145 views

libvirt NON TLS connectivity

virsh seems to require TLS even when tls is set to 0 in libvirtd.conf. I would prefer not to use TLS since I am working in an secure environment and as such TLS only adds complication, but doesn't ...
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1answer
137 views

libvirt management is slow under ubuntu

I've just done a fresh install of KVM/Qemu under Ubuntu 14.04.2 on an older (C2D gen) server with dual quad core xeons and 24 gb of ram. I'm finding that I'm waiting for operations in virsh for around ...
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0answers
57 views

Prevent container from shutting down at console exit

As the manual clearly states, an LXC container automatically destroys (shuts down) itself when you exit the console. However, we're using these machines as servers (sshd, sometimes apache, ...) and I ...
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2answers
4k views

State of VM after 'virsh save'

virsh save vm_name memdump and then virsh restore memdump restores a (running) VM all right. However, a VM is shut off after virsh save. I'm writing a "live" backup and restore script for KVM VMs, so ...
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1answer
1k views

Revert libvirt external snapshot

Having some issues understanding how to revert snapshots on ubuntu 14.04 using KVM... Until now i have been using internal snapshots, however due to space issues (space not being re-allocated after ...
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0answers
152 views

Access to equally defined VM in different VLANs

I have a working libvirt cluster and in order to perform some paralellization I have duplicated it. At the moment my scenario looks like this: two clusters whose VM definitions are exactly the same, i....
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1answer
208 views

libvirt external snapshots: snapshot chain linked through filenames or inodes

If I have the following chain (it was created using external snapshots through virsh): base.qcow2 --> snap1 --> snap2[current] Now if I copy "base.qcow2" to a remote location, del the original "...
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1answer
1k views

9p root filesystem using libvirt and QEMU

I'm attempting to boot a Linux VM with a 9p root file system using libvirt. This works perfectly when QEMU is invoked directly, using the following command: qemu-system-x86_64 -enable-kvm \ -kernel /...
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1answer
141 views

nova volume-detach fails silently, compute log shows libvirtError: invalid argument: no target device vdb

Using Openstack Havana, I'm trying to detach a cinder volume from a nova instance. Nova volume-list shows it as in-use: | 34b0ea26-f85c-4b62-8ebd-884b0e63e2d5 | in-use | filestore | 256 | None| ...
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3answers
4k views

KVM virt-clone while the VM is running

Is it possible to clone a running kvm machine without tools like virt-clone? They already have the original vm in production, I cannot shut it down. If I don't care about temporary data corruption (...
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1answer
15k views

How to configure and use qemu-guest-agent in Ubuntu 12.04? My main aim is to get the IP address of guest VM from Host machine

In the documentation it is not very clear that how to install and use qemu-guest-agent in Ubuntu 12.04. So can anyone help me out ? http://wiki.libvirt.org/page/Qemu_guest_agent It is a daemon ...
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2answers
1k views

How to measure boot time of a VM from host machine?

On both Guest machine and host machine, I am using Ubuntu 12.04. As a hypervisor I am using KVM. I want to perform some experiments related to boot-storm and I have created all other scripts to ...