May 2012 - Users - libvirt List Archives

[libvirt-users] some problem with snapshot by libvirt
by xingxing gao 21 Nov '14

21 Nov '14

Hi,all,i am using libvirt to manage my vm,in these days i am testing the libvirt snapshot ,but meet some problem: the snapshot was created from this command: snapshot-create-as win7 --disk-only --diskspec vda,snapshot=external --diskspec hda,snapshot=no but when i tried to revert from the snapshot which created from the above command ,i got error below: virsh # snapshot-revert win7 1338041515 --force error: unsupported configuration: revert to external disk snapshot not supported yet version: virsh # version Compiled against library: libvir 0.9.4 Using library: libvir 0.9.4 Using API: QEMU 0.9.4 Running hypervisor: QEMU 1.0.93

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[libvirt-users] virsh list not working with xen 4
by Rogério Vinhal Nunes 21 Sep '12

21 Sep '12

Hi, I'm having some trouble to get libvirt to show the correct power state of my virtual machines. I'm using Ubuntu 10.04 + Xen 4.1.1 + libvirt 0.8.8. virsh list --all only shows turned off machines registered in xend. If I turn them on, they just "disappear", and when I start machines directly from xml, they just doesn't appear at all. Libvirt is correctly connecting to xen as I can use the other commands fine, just the list option doesn't seem to work at all. What can I do to change that? # virsh version Compiled against library: libvir 0.8.8 Using library: libvir 0.8.8 Using API: Xen 3.0.1 Running hypervisor: Xen 4.1.0

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[libvirt-users] qemu-kvm fails on RHEL6
by sumit sengupta 02 Jul '12

02 Jul '12

Hi, When I'm trying to run qemu-kvm command on RHEL6(linux kernel 2.6.32) then I get following errors which I think related to tap devices in my setup. Any idea why is that? bash$ LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -S -M rhel6.2.0 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name instance-00000027 -uuid a93aeed9-15f7-4ded-b6b3-34c8d2c101a8 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/instance-00000027.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -kernel /home/sumitsen/openstack/nova/instances/instance-00000027/kernel -initrd /home/sumitsen/openstack/nova/instances/instance-00000027/ramdisk -append root=/dev/vda console=ttyS0 -drive file=/home/sumitsen/openstack/nova/instances/instance-00000027/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -netdev tap,fd=26,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=fa:16:3e:15:84:3e,bus=pci.0,addr=0x3 -chardev file,id=charserial0,path=/home/sumitsen/openstack/nova/instances/instance-00000027/console.log -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -k en-us -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 char device redirected to /dev/pts/1 qemu-kvm: -netdev tap,fd=26,id=hostnet0: TUNGETIFF ioctl() failed: Bad file descriptor TUNSETOFFLOAD ioctl() failed: Bad file descriptor qemu-kvm: -append root=/dev/vda: could not open disk image console=ttyS0: No such file or directory [sumitsen@sorrygate-dr ~]$ rpm -qa qemu-kvm qemu-kvm-0.12.1.2-2.209.el6.x86_64 Let me know if you need any other info. Thanks, Sumit

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[libvirt-users] [Fwd: error: this function is not supported by the connection driver : virConnectNumOfStoragePool]
by Onkar 05 Jun '12

05 Jun '12

Hello All, Any idea on this issue ? Regards, Onkar -------- Forwarded Message -------- From: Onkar <kernzap(a)gmail.com> To: libvir-list <libvir-list(a)redhat.com> Subject: error: this function is not supported by the connection driver : virConnectNumOfStoragePool Date: Wed, 30 May 2012 21:29:42 +0530 Hello, I configured libvirt like this ./configure --prefix=/ --exec-prefix=/usr/ --libdir=/usr/lib64/ --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-qemu --with-libvirtd --with-selinux --with-network --with-libblkid and then, make -j4 make install and then # virsh list --all Id Name State ---------------------------------------------------- - vm1 shut off # virsh pool-list --all error: Failed to list active pools error: this function is not supported by the connection driver: virConnectNumOfStoragePools getting this error , any clues on why is this error ? Regards, Onkar

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[libvirt-users] converting save/dump output into physical memory image
by Andrew Tappert 04 Jun '12

04 Jun '12

A lot of people in the security community, myself included, are interested in memory forensics these days. Virtualization is a natural fit with memory forensics because it allows one to get access to a guest's memory without having to introduce any extra software into the guest or otherwise interfere with it. Incident responders are particularly interested in getting memory dumps from systems they're investigating. Virsh has "save" and "dump" commands for storing the state of a guest to a file on disk, but memory of KVM guests doesn't get saved in the "standard" input format for memory forensics tools, which is a raw physical memory image. (This is what you'd get via the classical "dd /dev/mem" approach or the contemporary equivalent using the crash driver; and VMware Server and Workstation produce .vmem files, which are such raw physical memory images, when a guest is paused or snapshotted.) In order to analyze the memory of Libvirt/KVM guests with my Linux memory forensics software, Second Look, I've created a tool for converting Libvirt-QEMU-save files (output of virsh save command) or QEMU-savevm files (output of virsh dump command) to raw physical memory images. I've got a basic working capability, though I'm still tracking down some problems with a guest allocated 8GB RAM--not all the memory seems to be present in the save or dump file. And I haven't tested very extensively yet, version support is limited to what I myself am currently running, etc. I'd like to know if this is a capability that others are interested in. Is this something that would be of interest to the Libvirt project if I were to contribute the code, or to the KVM project, or do you think it best exists as a separate project? I've also got a proof-of-concept tool for converting hibernate images to raw physical memory images. Perhaps a collection of tools for converting various memory dump formats would be a good project. Anyone else interested in this kind of stuff? As an author of commercial memory forensics software I've got a vested interest in availability of good memory acquisition capabilities. But there are a number of people working on FOSS Linux memory analysis tools, too... Andrew

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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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