October 2010 - Users - libvirt List Archives

Re: [libvirt-users] Monitoring and statistics through libvirt
by peter.phaal＠gmail.com 20 Oct '10

20 Oct '10

On Fri, Oct 01, 2010 at 03:47:23PM +0200, Tomi wrote: > Hi folks, > is it possible to monitor and gather statistics in realtime (CPU, > memory, HDD, network, ... - something like dstat) of guest systems > with libvirt through console from host system (KVM based)? If yes, do > those guests need to be created through libvirt? Thanks for your help > and time. If you have a large number of servers to monitor, you might want to look at the Host sFlow agent: http://host-sflow.sourceforge.net/ The Host sFlow agent is installed on the server and locally polls physical server statistics and VM statistics using libvirt. The statistics are exported using the sFlow protocol. http://www.sflow.org/ If you want detailed network visibility then the Open vSwitch includes sFlow monitoring of inter-VM traffic: http://openvswitch.org/ For more information, see: http://blog.sflow.com/2010/10/kvm.html http://blog.sflow.com/2010/10/sflowtrend-adds-server-performance.html Peter

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[libvirt-users] libvirt fails to autostart on boot
by Serg Khaladzinski 20 Oct '10

20 Oct '10

Hi I'm having a problem with libvirt. OS: Ubuntu 10.04 When I installed everything initially it worked properly, I was able to use virtual manager to connect to QEMU and install (and run guest OS). But after I rebooted my box - libvirt is not started even though I can see init script in /etc/init.d/libvirt-bin When I start libvirtd manually it works.. But it's kind of annoying for me to do it manually every time.. Maybe someone may suggest any ideas of how can I debug and fix this issue with libvirt autostart. Thanks a lot.

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Re: [libvirt-users] Monitoring and statistics through libvirt
by Peter Phaal 15 Oct '10

15 Oct '10

On Fri, Oct 01, 2010 at 03:47:23PM +0200, Tomi wrote: > Hi folks, > > is it possible to monitor and gather statistics in realtime (CPU, > memory, HDD, network, ... - something like dstat) of guest systems > with libvirt through console from host system (KVM based)? If yes, do > those guests need to be created through libvirt? Thanks for your help > and time. If you have a large number of servers to monitor, you might want to look at the Host sFlow agent: http://host-sflow.sourceforge.net/ The Host sFlow agent is installed on the server and locally polls physical server statistics and VM statistics using libvirt. The statistics are exported using the sFlow protocol. http://www.sflow.org/ If you want detailed network visibility then the Open vSwitch includes sFlow monitoring of inter-VM traffic: http://openvswitch.org/ For more information, see: http://blog.sflow.com/2010/10/kvm.html http://blog.sflow.com/2010/10/sflowtrend-adds-server-performance.html Peter

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[libvirt-users] NFS4 + SELinux
by Mike Hall 15 Oct '10

15 Oct '10

All test machines are CentOS 5.5 (RHEL subscriptions purchased). We've had NFS3 storage working fine and decided to try NFS4. We can mount an NFS4 share on our KVM host, but the SELinux file context on the mountpoint directory is magically changed from virt_image_t to nfs_t. Restorecon refuses to change it back. Adding the mount option context=system_u:object_r:virt_image_t on either server or client doesn't help (option not recognised). What could we be doing wrong? Does NFS4 + KVM work? Are there any 'best practices' references around for using NFS4 for KVM storage? Much of the documentation doesn't appear 100% relevant as we're dealing with a dedicated SAN network with one user (root) and 'always on' sharing, so much of the more complicated authentication and autofs stuff just gets in the way. Thanks Michael Hall IT Communications Officer Alice Springs Town Council mhall(a)astc.nt.gov.au (08) 8950 0561

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[libvirt-users] NFSv4 Storage Pools
by paul.worner＠thomsonreuters.com 14 Oct '10

14 Oct '10

Hi, Is it possible to configure libvirt to use NFSv4 for a pool? I am doing some iptables SNATing and rpc.statd can't handle it. Thanks, Paul

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[libvirt-users] How to rename a domain?
by Ganesh Pagade 14 Oct '10

14 Oct '10

Hi, I am using libvirt Java bindings. How can I rename a domain? Is there an API to do this? Thanks, -Ganesh

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Re: [libvirt-users] Question about use libvirt
by Mike Hall 13 Oct '10

13 Oct '10

Original message: For a new system to develop, I need to know if I can use libvirt for to get (listen) the information that pass trought the lan (vlan) of the each VM. Marcela's perfect Spanish: quiero saber si utilizando esta libreria, puedo utilizar alguna función que me permita capturar los mensajes que se envian aplicaciones paralelas de paso de mensajes que se ejecutan en las máquinas virtuales. Mike's imperfect translation: "I need to know if, using this library (libvirt), I can use a function that allows me to capture information sent by applications in parallel to/in addition to information passed by virtual machines" I'm no expert, but I don't think libvirt has access, via virtual networking, to data sent by applications running in virtual machines. My guess is that such data would be accessible in the same way as with physical machines on a physical network (eg tcpdump?). Mike

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Re: [libvirt-users] Fwd: undefining and redefining a Domain from libvirt java bindings
by Osier 13 Oct '10

13 Oct '10

----- "Ravi Pawar" <ravifc(a)gmail.com> wrote: > hi, > > i am trying to undefine a domain by using dm.undefine(); > and then trying to create one with same name is giving me error saying > 'Domain not found: no domain with matching uuid > 'aeae9d4e-17cb-b661-a612-88ac677c28c1' The error is not throwed by "dm.undefine". looked at and tried your test program, it throws error message like: libvir: QEMU error : Domain not found: no domain with matching name 'tt2' Definitely, it's throwed by: dm =conn.domainLookupByName("tt2"); I guess you looked up the domain by "UUID" before.. so it came the error message saying "no domain with matching uuid .....". The error doesn't influnce the program running forward. e.g. Domain dm1 = conn.domainDefineXML(dumpxml); dm1.create(); int id; id = dm1.getID(); System.out.println(id); dm1.undefine(); You will get the domain ID.. I'm not familiar with Java, guess you can catch the error and turn it into a warning message with "Expection Handler". correct me if I'm not right.. :-) - Osier > > i have attached my test program which reproduces the issue. > > please let me know where i am going wrong? > > configuration: libvirt : 0.6.3 > Java Bindings: 0.4.2 > > -- > Thanks & Regards > > Ravi Pawar > > _______________________________________________ > libvirt-users mailing list > libvirt-users(a)redhat.com > https://www.redhat.com/mailman/listinfo/libvirt-users

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[libvirt-users] bootloader_args element
by David Grundy 12 Oct '10

12 Oct '10

I am trying to set the hostname of VMs at boot time and banging my head against the wall. I am using virsh create xen-config.xml to boot a Scientific Linux 5.5 image. I have gone through the libvirt domain xml format at http://libvirt.org/formatdomain.html#elementsResources and I don't see anywhere to set the hostname in there. I am using pygrub for the bootloader and noticed the "bootloader_args" element. Can I pass an argument to the kernel at boot to set the hostname? Can I pass anything to the kernel at boot time? Nothing I have tried seems to work. I have tried sifting through the pygrub code (for lack of documentation) and no luck yet. I think my challenge is with pygrub but any help would be appreciated. I have also posted this at http://lists.xensource.com/archives/html/xen-users/2010-10/msg00143.html and http://www.linuxquestions.org/questions/linux-virtualization-90/setting-hos… but still waiting... Cheers, David

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[libvirt-users] Mac OS X: dyld: lazy symbol binding failed
by Mitchell Hashimoto 12 Oct '10

12 Oct '10

I'm using the Ruby/FFI libvirt library and getting this consistently on Mac OS X: ruby-1.9.2-p0 > FFI::Libvirt.virInitialize dyld: lazy symbol binding failed: Symbol not found: _virThreadInitialize Referenced from: /usr/local/lib/libvirt.dylib Expected in: flat namespace dyld: Symbol not found: _virThreadInitialize Referenced from: /usr/local/lib/libvirt.dylib Expected in: flat namespace Trace/BPT trap I exported DYLD_PRINT_LIBRARIES and it shows that libvirt.dylib is loaded in the process space, but the above still occurs. When I statically link into a C program it works fine, however. Anyone have any idea what could be causing this? If this doesn't get a response, I'll post it to the dev list, since its perhaps relevant to them as well. Thanks, Mitchell

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