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[libvirt-users] Gigabit network card not fully operational using KVM/Ubuntu
by Josir Cardoso Gomes 01 Feb '12

01 Feb '12

Hi folks, *Host:* Ubuntu 10.04.3 with KVM lspci | grep net 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06) *Guest:* Ubuntu 10.04.3 lspci: 00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02) 00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] 00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] 00:01.2 USB Controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] (rev 01) 00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03) 00:02.0 VGA compatible controller: Cirrus Logic GD 5446 00:03.0 Ethernet controller: Qumranet, Inc. Virtio network device *Problem:* The virtio network device operates on 100Mbits. How do I know that it operates on 100Mbits ? I copy a single big file via rsh and I can see the real speed. The network is completely dedicated to this operations, that is, there is no other traffic between other machines. *Question:* What do I have to do to use full bandwidth ? If this is not the best forum to ask this question, do you suggest another channel ? Thanks in advance, Josir Gomes

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[libvirt-users] libvirt 0.9.4-23 on CentOS 6.2 with xen support
by Rudolf Ladyzhenskii 01 Feb '12

01 Feb '12

Hi, all I am trying to install xen on CentOS 6.2. (64 bit on Intel CPU). I am at the stage when xen kernel is app and running and xend is running. Next issue is that I am getting following message when tyring to run virt-manager: no connection driver available for No connection for URI xen:/// Some Google search pointed me to the fact that libvirt as installed from CentOS repository is not built with xen support. I found some quides on how to rebuild libvirt from source with patches for xen support and follow them. I am trying to rebuild libvirt version 0.9.4-23, as this is the rpm that was installed on CentOS. I am getting an error as I build the rpm. xencapstest fails. So, there are few questions: 1. Is there an easier way to get libvirt to work with xen? 2. If rebuilding of RPM is the only option, how do I fix xencaps error? Thanks, Rudolf P.S. Guide I am trying to follow is: http://www.howtoforge.com/virtualization-with-xen-on-centos-6.2-x86_64-para…

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[libvirt-users] Libvirt migration issues (0.9.4 and 0.9.9)
by Daniel Espling 31 Jan '12

31 Jan '12

Dear all, we're having two different problems with migrations in libvirt, running as root user on host machines with CentOS release 5.5 (Final), kernel: Linux 2.6.32.24 #3 SMP Fri Oct 29 16:22:02 BST 2010 x86_64 x86_64 x86_64 GNU/Linux First case: virsh version Compiled against library: libvir 0.9.4 Using library: libvir 0.9.4 Using API: QEMU 0.9.4 Running hypervisor: QEMU 1.0.50 Migrations work well for a basic VM, but if we attach a disk to the usb bus migration is no longer possible and fails with the error message: "error: operation failed: migration job: is not active". This is regardless of if the device is mounted inside the VM or not (debian). Please find more information attached. If we attach the same (.iso based) disk to the scsi bus instead, migrations work as normal. ---- To mitigate this problem, we tried upgrading to a more recent libvirt version: Compiled against library: libvir 0.9.9 Using library: libvir 0.9.9 Using API: QEMU 0.9.9 Running hypervisor: QEMU 1.0.50 When trying to migrate a normal (debian) instance from one host to another using the same domain as in the previous successful case without any devices attached, migration fails with the error message "error: Unable to copy socket file handle: Invalid argument". The libvirt.log only has a similar single-line of information: 2012-01-30 15:44:46.772+0000: 7546: error : virNetSocketDupFD:787 : Unable to copy socket file handle: Invalid argument. The network configuration used here is the same as we successfully used in the 0.9.4 test case, using static ip's. Thankful for assistance, not really sure what to try next. :) Regards, Daniel Espling

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[libvirt-users] libvir: error : cannot getpwuid_r(107): Success
by vipul borikar 31 Jan '12

31 Jan '12

I am on RHEL 6.1 running KVM. I am getting following error when i start a Ubuntu 11.10 Guest I am attaching my xml file . # virsh -c qemu:///system create Ubuntu-110.10.xml error: Failed to create domain from Ubuntu-110.10.xml error: internal error Process exited while reading console log output: 16:19:53.991: 2418: info : libvirt version: 0.8.7, package: 18.el6 (Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>, 2011-04-18-10:28:30, x86-008.build.bos.redhat.com) 16:19:53.991: 2418: error : virSetUIDGID:2905 : cannot getpwuid_r(107): Success libvir: error : cannot getpwuid_r(107): Success Where should i looks for more info??? -- Thanks Vipul Borikar "Our task must be to free ourselves...by widening our circle of compassion to embrace all living creatures and the whole of nature and its beauty."

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[libvirt-users] How to change libvirt / cgroup interaction?
by Samuel Hassine 26 Jan '12

26 Jan '12

Hi there, Do you know if there is a way to modify how libvirt interacts with the cgroup? Because, I successfully add the /dev/net/tun support in my LXC container by doing: echo c 10:200 rwm >> /cgroup/libvirt/lxc/instance-00000005/devices.allow But when I restart the instance/LXC container, this option has gone. How can I make this persistant? Is there a configuration file? Thanks for your answers. Best regards. Sam

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[libvirt-users] Preventing 'virsh start' while doing backup?
by Ken Coar 26 Jan '12

26 Jan '12

Is there any way to interface with virsh to keep it from executing a startup operation? Sort of like the /etc/nologin (man page nologin(5)) mechanism? Basically, I want to be able to shut down a VM in order to copy its disk images, and be reasonably assured that it won't be started before I'm finished. Is there any sort of hook or interlock file or other mechanism to accomplish this? Thanks! -- #ken B-)} Ken Coar, Sanagendamgagwedweinini IT Engineering Tower, Red Hat/RDU "Millennium hand and shrimp!"

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[libvirt-users] how to change existing domain xml?
by p-man314＠mail.ru 25 Jan '12

25 Jan '12

Hi. I'm trying to change network settings for a domain via libvirt (the driver is xenapi) with no success. According to its sources, 'virsh edit' uses virDomainGetXMLDesc(), allows to edit the received xml and then use virDomainDefineXML(). In case of xenapi driver it leads to a new vm creation (with the same name and edited settings). Looking through the list of API functions I failed to find a function like virDomainUpdateXML() that would change configuration of existing domain. Could you please suggest a way to do it? Thanks in advance.

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[libvirt-users] ANNOUNCE: oz 0.8.0 release
by Chris Lalancette 25 Jan '12

25 Jan '12

All, I'm pleased to announce release 0.8.0 of Oz. Oz is a program for doing automated installation of guest operating systems with limited input from the user. Release 0.8.0 is a (long overdue) bugfix and feature release for Oz. Some of the highlights between Oz 0.7.0 and 0.8.0 are: - Optional virtualenv make target - Conversion of unittests to py.test - Replace mkisofs with genisoimage - Debian package - Ability to change the root password for Debian installs - Add unittests for ozutil - Add some unittests for the Guest object - SSH tunnel (with SSL vhost) support for local repositories (mostly useful for imagefactory) - Add a new manpage for oz-examples - Make the output filename configurable with a command-line option to oz-install - Monitor both network and disk activity when looking for guest activity - Support for installing Ubuntu 11.10 - Support for SSL certificates for repositories - Support for an optional version in the TDL - Support for installling Mandrake 9.1, 9.2, 10.0, 10.1, 10.2 - Support for installing Mandriva 2006.0, 2007.0, 2008.0 - Support for Ubuntu customization - Support for installing RHEL 6.2 A tarball of this release is available, as well as packages for Fedora-16. Instructions on how to get and use Oz are available at http://aeolusproject.org/oz.html If you have any questions or comments about Oz, please feel free to contact aeolus-devel(a)lists.fedorahosted.org or me (clalancette(a)gmail.com) directly. Thanks to everyone who contributed to this release through bug reports, patches, and suggestions for improvement. -- Chris Lalancette

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[libvirt-users] [Problem] C# virDomainShutdown
by Danny Fonk 24 Jan '12

24 Jan '12

Hey there, im using libvirt since 2 weeks now and there are still some issues im confronted with. I use libvirt in C# and I'm running a 32-bit machine on Windows 7. Actually my worst problem is, is that I'm not able to Shutdown on machine no matter which command I'm using. virDomainShutdown isn't working nor virDomainDestroy. Basically I use the virConnectOpenAuth example to make a test on this. You'll find a code-excerpt in the attachment. Everything else is working. Like Domain.GetName etc. - i just can't figure out the failure and I wanted to ask if the mistake is in the API since it's not tested on a 32-bit Windows. Already thanks for the support. Best regards, D. Fonk -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de

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[libvirt-users] Question about libvirt / LXC
by Samuel Hassine 24 Jan '12

24 Jan '12

Hi there, I have a small simple question about libvirt and LXC containers. I know how to activate /dev/net/tun in an LXC container: #tun lxc.cgroup.devices.allow = c 10:200 rwm in the LXC config file. But, how to do that in a libvirt XML file? I just need to activate the /dev/net/tun device in an LXC container using libvirt. Thanks for your answers! Best regards. Sam

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