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[libvirt-users] Image booted using libvirt with --arch=i686 gives a message: Kernel detected only i486 CPU
by Georgy Sebastian Pullolickal 01 Jun '12

01 Jun '12

I tried booting a gentoo image I had created using the command virt-install --name=test --ram=512 --vcpus=1 --import --os-type=Linux --arch=i686 --disk path=/vms/test.qcow2,format=qcow2 --graphics vnc,port=5910,listen=0.0.0.0,password=test123 --network bridge=virbr0 --noautoconsole --description --autostart However even though the architecture is specified as i686, the image does not boot. It gives a message This kernel requires an i586 CPU, but only detected an i486 CPU. Unable to boot- please use a kernel appropriate for your CPU. The created libvirt profile xml can be found at Pastebin test.xml<http://pastebin.ca/2156937> I am able to boot it directly using qemu --enable-kvm I am at a loss about what could be causing such an issue?? Additionally is there by which I can pass additional parameters to qemu using libvirt? I understand that it is possible to pass the arguments by modifying the domain xml, but is there any way to do the same though command line? For my current work, I need to use a custom version of qemu with custom arguments. -- Regards Georgy

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[libvirt-users] Reg: Info on memory usage from within LXC.
by Alphonse Hansel Anthony 01 Jun '12

01 Jun '12

Hi All, Is it possible to report memory usage of a LXC, from within a LXC? Tools like #top, #free use /proc information and report back the host details. Is /proc namespace aware? Are there any other tools available to report memory usage from cgroups directly, but from within the container? Any info or pointers on this would be useful. Thanks, Alphonse

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[libvirt-users] NPIV setup?
by Jason Price 01 Jun '12

01 Jun '12

I'm missing something. The purpose of NPIV (as I understand it) is to give a guest OS an HBA that it can scan, play with new luns, etc all without making changes to the physical server(s) the guest is living in currently. However, I can't find a way to either have the guest's XML config create the HBA or for the physical server to successfully GIVE the HBA to the guest. I can give disks all day long, but I can't give the HBA to the guest. It seems like libvirt and virsh can only create the vHBA on the physical box, which defeats the purpose of working with NPIV then... I can just present the same luns to the REAL WWPNs of the physical boxes that need access, setup multipathd to give /dev/mapper names in a consistent manner, and give the raw disks to the guests. I really want to get the physical KVM servers out of the 'storage management' game aside from the basic OSes of the guests. How can I do that? (or am I missing something?) --Jason

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[libvirt-users] win-xp guest after reboot: could not open disk image /dev/sr0: mo medium found and extreme sluggisch
by Ekkard Gerlach 30 May '12

30 May '12

Hi, win-xp won't boot after installation. The CD is needed to boot from. How can I convince win-xp to boot? That's what I did: ================== I installed win-xp guest on debian squeeze: # virt-install --connect qemu:///system --name winxp-prof --ram 1024 \ --disk path=/dev/vg-levo/winxp-kvm,size=10 \ --network bridge:br0 --vnc --os-variant winxp --cdrom /dev/sr0 /dev/vg-levo/winxp-kvm is a lvm (logical volume, 10GB) Installation worked, but was extrem slow. Machine: Lenovo B560, core i3, 6 GB RAM. WinXP made a normal reboot after installation, I ejected install cd, then: virt-manager output: Error starting domain: internal error Process exited while reading console log output: chard device redirected to /dev/pts/2 qemu: could not open disk image /dev/sr0: mo medium found So I inserted the CD and a black blanc screen appeared. Windows didn't boot. I deleted installation configuration: # virsh undefine winxp-prof I invoked virt-install (see above) once again ... and win-xp is booting ... what a surprise, without installing again after undefine .. ! The reason: the lvm partition was not deleted. WinXP now always needs a CD to boot and is extreme sluggisch. Right mouse click lasts about one minute! tia Ekkard

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[libvirt-users] Virtual Machines Stay Off If Rebooted
by Andrew Martin 30 May '12

30 May '12

Hello, I am using libvirt on Ubuntu 10.04 Server and the following versions of these packages: libvirt-bin, libvirt0, python-libvirt - 0.7.5-5ubuntu27.22 qemu-kvm 0.12.3+noroms-0ubuntu9.18 Recently, when restarting a VM (either by issuing "sudo reboot" on a Linux guest or choosing "Restart" from the Start Menu on a Windows guest) the VM shuts down and remains off rather than simply restarting. I cannot test "virsh restart <domain>" on this server as the version of libvirt does not appear to support restarting - see https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/368962 I do not receive any errors in /var/log when the shutdown occurs. Powering the VM back on works, however I would prefer to have hot restart working so VMs that are automatically rebooted to install updates will come back up automatically. Do you have any suggestions on how to debug this behavior? Thanks, Andrew

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[libvirt-users] How to configure cpu frequency of guest
by hongming 30 May '12

30 May '12

Hi Experts I want to know how to configure cpu frequency of guest. Why it always display "cpu MHz : 3092.974" , If it needs to offer user a KVM guest with 1 GHz cpu using libvirt , How to do it ? Thanks a lot in advance. Hongming

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[libvirt-users] how to store an internal disk snapshot by use
by Rujie Xu 30 May '12

30 May '12

Hello everyone, I am trying to find a way to store an internal disk snapshot and supposed to restore later. Here is the problems I met: 1) when I use SnapshotCreateXML() to create a disk_only snapshot while the domain is inactive, there is an error happened: disk snapshot of inactive domains not implemented yet. I am wondering is there and way I can save the disk_only snapshot when the domain is inactive right now? 2) also use snapshotCreateXML() to create a disk_only snapshot while the domain is active, and use the xml to set the <disk name="hda" snapshot="internal"> there is also an error happened: unsupported configuration: active qemu domains require external disk snapshot; disk hda requested internal 3) when I use snapshotCreateXML() to create a disk_only snapshot using external file, it could be done, but when I try to use revertToSnapshot() to revert this snapshot there is another error happened: revert to external snapshot not supported yet. Is there anyone can help me about this, or we just can't use libvirt to managed the disk snapshot right now? Thanks very much! -- Best Regards, Roger Xu

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Re: [libvirt-users] some problem with snapshot by libvirt
by xingxing gao 29 May '12

29 May '12

sure you can add the list back in, 2012/5/29 Eric Blake <eblake(a)redhat.com>: > On 05/29/2012 09:03 AM, xingxing gao wrote: >> to create snapshot ,I did step below: > > I'd really rather answer this in public; do I have your permission to > add the list back in, or better yet, can you repost to the list? > > Also, the list tends to frown on top-posting. > >>> Did you mean for this to go to the list, so that others may chime in or >>> benefit from the answers? >>> > > > -- > Eric Blake eblake(a)redhat.com +1-919-301-3266 > Libvirt virtualization library http://libvirt.org >

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[libvirt-users] create net if, but not connect
by Sergio Kvjato 29 May '12

29 May '12

Hello, is there a way to create net if but not connect to any bridge? <interface type='ethernet'/> is not work becaue its need to run in root mode not user mode Thanks.

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[libvirt-users] What features of kernel are required to support virDomainGetCPUStats?
by Zhihua Che 29 May '12

29 May '12

Hi, Weeks ago, I developed my app under ubuntu-11.10 (kernel 3.0) with lilbvirt-0.9.10. In my code , I used virDomainGetCPUStats to query cpu usage info of domains, and it worked well. However, today, I port my code to ubuntu-10.04.4 (kernel 2.6.32) with libvirt-0.9.10, I find the function virDomainGetCPUStats can't work and complains "this function is not supported by the connection driver: virDomainGetCPUStats". I guess the kernel difference cause this problem because the libvirt is the same on two operating systems. I wonder what features of kernel are required to support virDomainGetCPUStats? I thought cgroup is a prerequisite. The following are .config files of two kernels. ubuntu-11.10 CONFIG_CGROUP_FREEZER=y CONFIG_CGROUP_DEVICE=y CONFIG_CPUSETS=y CONFIG_PROC_PID_CPUSET=y CONFIG_CGROUP_CPUACCT=y CONFIG_RESOURCE_COUNTERS=y CONFIG_CGROUP_MEM_RES_CTLR=y CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED=y CONFIG_CGROUP_PERF=y CONFIG_CGROUP_SCHED=y CONFIG_FAIR_GROUP_SCHED=y CONFIG_RT_GROUP_SCHED=y CONFIG_BLK_CGROUP=y ubuntu-10.04.4 CONFIG_CGROUP_NS=y CONFIG_CGROUP_FREEZER=y CONFIG_CGROUP_DEVICE=y CONFIG_CPUSETS=y CONFIG_PROC_PID_CPUSET=y CONFIG_CGROUP_CPUACCT=y CONFIG_RESOURCE_COUNTERS=y CONFIG_CGROUP_MEM_RES_CTLR=y CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y CONFIG_CGROUP_SCHED=y CONFIG_FAIR_GROUP_SCHED=y CONFIG_RT_GROUP_SCHED=y CONFIG_MM_OWNER=y As you can see, CPUSET and CPUACCT are enabled in both kernels. So what else features of kernel are required to support virDomainGetCPUStats? harvey

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