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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1answer
176 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 ...
2
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1answer
119 views

Pass an USB hub from a KVM host to a guest with libvirt

I have the following USB devices on a Linux server: # lsusb -t /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/2p, 480M |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M ...
2
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1answer
701 views

capping VM IO with cgroups

I'm using cgroups to cap disk IO that a VM does by using libvirt's support for cgroups. So, I'm getting the major/minor number of the device from a 'ls -lL' on the drive where the '.img' file for the ...
2
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1answer
596 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 ...
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1answer
49 views

How to disable lbvirt network DNS

Is there a way to disable DNS in libvirt network? I want to have custom configured dnsmasq for local DNS caching but libvirt's dnsmasq holds 53 port.
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1answer
1k views

Remote automated provisioning to a XenServer Hypervisor

I'm currently working on a project where I use Vagrant with Ansible provisioning to create local environments in VirtualBox. I'm currently working with a University and we have a XenServer Hypervisor ...
1
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1answer
179 views

virt-viewer slower than virt-manager when viewing

I've got a thin client server in which I have a few VM's for users under KVM which I manage through virt-manager. What I've noticed is if I start a VM guest on a thin client using the command ...
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1answer
1k views

How to fix a frozen qemu VM?

I have a qemu hypervisor on RHEL 6.4 that hosts VMs that will quite often lose their connection to the network. When the VM has lost its connection I can view and interact with the it using ...
1
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1answer
323 views

Cannot start XML defined Linux Container, faulty cgroup mount

Using ubuntu 13.04 latest; i've installed lxc and various other tools Here's my XML definition: <domain type='lxc'> <name>vm1</name> <memory>500000</memory> ...
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1answer
340 views

Changing the mac address in a libvirt xml config file breaks network connectivity for the guest

I'm using Xen with libvirt and trying to set it up on a bridged interface. I am able to install an OS and everything works as I would expect. If I save the xml output from "virsh dumpxml guest", edit ...
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1answer
223 views

Network traffic is not being forwarded from a VM to the network using a bridged interface with Xen + libvirt

I'm having trouble getting network access from a VM that I'm running using Xen and libvirt. I've been trying different things and reading similar posts online for a couple of days but I'm really stuck ...
2
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0answers
145 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) ...
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117 views

LibVirt (QEMU) Shutting down from inside guest

I am currently running LibVirt with Qemu on Debian Wheezy: Versions: libvirtd (libvirt) 1.2.4 qemu-x86_64 version 2.0.0 (Debian 2.0.0+dfsg-4~bpo70+1), Copyright (c) 2003-2008 Fabrice Bellard It's ...
2
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0answers
74 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 ...
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0answers
751 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 ...
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0answers
687 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 ...
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0answers
540 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 ...
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0answers
106 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, ...
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0answers
99 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 ...
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0answers
64 views

Why won't my libvirt VM communicate with apt repositories when wget and ping work?

I'm trying to use Vagrant and Puppet to make it easier to duplicate a multi-server setup for our websites. The recommended workflow is to vagrant up the puppetmaster server specifically first, and ...
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0answers
100 views

how to design network for virtual machines with just one nic

for the past week or so i've been recovering from the shock that i have literally no idea how my isp's network works, by getting a new box and trying to do a sensible design from scratch. our design ...
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79 views

Bridging Adapter in Ubuntu 12.04 LTS for KVM

Fresh install of Ubuntu 12.04 LTS with libvert/KVM installed. I have 2 virtual machines that I need need to be on the same LAN as the host. The host has two physical interfaces eth0 and eth1. eth1 is ...
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334 views

Libvirt providing bootp options without being configured to do so

I have a virtual network configured in libvirt and configured to provide DHCP (via dnsmasq) but not configured to provide bootp information (see below), but when I boot an iPXE ISO and look at the ...
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0answers
359 views

nwfilter: Generated firewall rules don't make any sense

I'm trying to configure nwfilter for KVM, but so far I haven't managed to figure out a working configuration. Network setup: The dom0 (Debian 7.1, kernel 3.2.46-1, libvirt 0.9.12) is connected via ...
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0answers
107 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 ...
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76 views

Domus Memory Used Issue With Xen On CentOS

Anyone know why I'm receiving this error? I compiled latest libvirt from source, I also tried with various rpm. I would like to get memory used by domus and it looks like it's not working with Xen 3 ...
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0answers
267 views

libvirt timing out. parted blocked messages in kern.log

I'm using Ubuntu 10.04.4 LTS to host KVM virtual machines. I'm using eucalyptus to manage them and having a lot of issues with libvirt not being able to interface with the KVM components and timing ...
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13 views

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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15 views

LXC containers - Duplicate tty on Gentoo guest

I'm trying to run Gentoo inside LXC container on Centos 7 host machine. I have prepared the guest OS on another (Gentoo) machine by following this tutorial https://wiki.gentoo.org/wiki/LXC. On this ...
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33 views

KVM GPU passthrough working only with cirruslogic vga added, VM goes in paused state if remove cirruslogic and boot with passed-through gpu only

It seems I had this working once but maybe that was when my kernel wasn't trying to load the fglrx kernel module. (I think before it was loading 'radeon' module) Not sure if this was the issue/change ...
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14 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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0answers
49 views

live-migration failure AND unable to launch an instance

I am having a trouble enablie live-migration in openstack. I follows the steps such as setting vnc_listen = 0.0.0.0 etc. ...
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0answers
32 views

Virt-manager internal error: Network default is not active

Virt-manager is not booting up any more guest machines & it says, """Error starting domain: internal error: Network default is not active""". On looking at log file, it says ebtables not ...
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0answers
111 views

Backup KVM running machine safely

I read some solutions to make backups of running VMs, but all take offline snapshots that seems difficult that will work if the VM has high I/O load. I have tested but i have doubts about the process ...
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0answers
75 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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20 views

mounting logical volume attached to vm while vm is running

i am experimenting lvm2 and qemu-kvm. and I want to share and ask some questions. at the end of there is appendix what i am doing. a logical volume on host is attached on guest host (vm) as vda. this ...
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0answers
61 views

CoreOs VM getting deleted after shutdown on libvirt

I installed CoreOs on libvirt using link https://coreos.com/docs/running-coreos/platforms/libvirt/. The VM is also showing inside Virtual Machine Manager and working fine. The problem is once I ...
0
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0answers
133 views

OpenStack Live-Migration VNC server error

I am following steps in : https://www.mirantis.com/blog/tutorial-openstack-live-migration-with-kvm-hypervisor-and-nfs-shared-storage/ But got a following error, when i try doing live-migration: ...
0
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0answers
47 views

Pass all traffic on an interface to the guest

I am trying to setup an NSM sensor using a VM. I have mirrored traffic from a Physical switch coming to eth1 of the host machine. I want the entire traffic to be available on the guest. Additionally, ...
0
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0answers
69 views

Using Xenlight with libvirt in debian, Unable to configure listen with remote libvirt

I am using libvirt 1.2.0 with xen hypervisor 4.4 in debian server. I am facing error when I try to connect remotely with other libvirt using TCP or TLS. I couldnt make libvirt to listen to the port. I ...
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0answers
144 views

Guest-VM can only ping CentOS KVM host, cannot access anything else

[root@KVMHOST]# ifconfig br0 Link encap:Ethernet HWaddr 00:1E:67:6B:17:2F inet addr:200.200.100.54 Bcast:220.225.255.255 Mask:255.255.0.0 inet6 addr: fe80::21e:67ff:fe6b:172f/64 ...
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0answers
27 views

LXC breaks IP-connectivity

I have i Libvirt/KVM-host with two physical ethernet cards. I use two bridges for these cards, one bridge for a local DHCP-based network and one for static public adresses. I use the first bridge to ...
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0answers
74 views

KVM Spice Problems on Jessie

I followed this tutorial to setup SPICE with libvirt/kvm for the sole purpose of to be able to copy text between the VM and my host machine (which is not a problem for vmware, virtualbox etc). ...
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493 views

Live migrate a libvirt/kvm virtual machine with both local and shared storage

I want to use both local (for better performance where it matters) and shared (for big slow disks) storage for a VM. Is it possible to live migrate such a VM? If the storage was pure local, the ...
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0answers
61 views

openvpn peers can ping network but not reverse

In a nutshell, I have two libvirt/kvm hosts on which I have virtual machines running. The hosting company that these machines are with cannot provide any sort of virtual network between these ...
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0answers
233 views

Libvirt/KVM vm - No network connectivity

I have installed devstack (OpenStacks development platform) on a physical ubuntu 14.04 host and I have been trying to follow the tutorials for manually creating an image. I have tried for Ubuntu and ...
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0answers
219 views

CentOS Host KVM Virtual Machine running a Windows VM - No internet access

I've installed a KVM virtual machine on a CentOS host using libvirt. I've also set up a bridged connection from the interface en0:4 running on IP x.x.x.15 to br0. (The IP is a public one). Running ...
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0answers
202 views

Importing an ARM qemu machine using libvirt

Context: I'm trying to virtualise a raspbian disk image using qemu so that I can easily use it with vagrant/puppet. The steps I've figured out so far are create a VM using qemu import this VM into ...
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0answers
222 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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0answers
127 views

LinuxBridge Plugin configuration seems broken in my OpenStack Grizzly set-up, but how to debug it and fix it?

I used theses scripts (OpenStackGeek) to install a Single-node OpenStack Grizzly on an Ubuntu 13.04. Everything seemed to work quite fine until I tried to reach one VM. Unfortunately, no VM was ...