May 2010 - Users - libvirt List Archives

[libvirt-users] Cannot create qcow2 images with libvirt 0.8.1
by Guido Winkelmann 31 May '10

31 May '10

Hi, After upgrading to libvirt 0.8.1, I can no longer create empty volumes with no backing store and an explicit format of qcow2. This XML volume definition: <volume> <name>testserverb-data2.img</name> <allocation>0</allocation> <capacity units='G'>20</capacity> <target> <format type='qcow2'/> <permissions> <owner>107</owner> <group>107</group> <mode>0744</mode> </permissions> </target> </volume> yields the error "Cannot run /usr/bin/qemu-img to create /data/testserverb- data.img: Invalid argument" In /var/log/messages on the qemu host I can find the following snippet after that: error : virRunWithHook:933 : internal error '/usr/bin/qemu-img create -f qcow2 /data/testserverb-data.img 0K' exited with non-zero status 1 and signal 0: qemu-img: Image creation needs a size parameter#012 error : virStorageBackendCreateExecCommand:537 : Cannot run /usr/bin/qemu-img to create /data/testserverb-data.img: Invalid argument error : qemudClientReadBuf:1653 : gnutls_record_recv: A TLS packet with unexpected length was received. If I leave out the <format> element and/or specify a <backingStore> element for the volume, it works again. (I suppose the backing store makes it work because in that case qemu-img does not need a size parameter...) The host system is a vanilla Fedora Core 12 system (aside from the upgraded libvirt). Regards, Guido Winkelmann

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[libvirt-users] Hot-add interface crashes libvirt
by steven765＠yahoo.com 27 May '10

27 May '10

Hi Everyone, After upgrading FC12 and now FC13 whenever I try to attach a network device using attach-device it promptly crashes libvirtd. Is there an option that changed in the network interface xml spec I missed? I really need this feature or at least the ability to connect and disconnect interfaces if that's possible? I've tried defining my network card in several ways: First the one that worked previously: <interface type="network"> <mac address="52:54:00:5c:fe:a8"/> <source network="fedora"/> </interface> Second copying what appeared in the xml after using the add hardware through the VMM: <interface type='network'> <mac address='52:54:00:5c:fe:a8'/> <source network='fedora'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </interface> Both ways fail now. Please help. Thanks, Steve

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[libvirt-users] How to obtain rights to extend libvirt documentation pages
by Марк Коренберг 25 May '10

25 May '10

For example, http://libvirt.org/formatdomain.html#elementsDisks does not contain <serial>xxxx</serial> tag. (https://bugzilla.redhat.com/show_bug.cgi?id=593266) I wrote to community (users and developers). No one has added this information to the site... -- Segmentation fault

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[libvirt-users] NAT-based network 2x-4x faster than routed network?
by Kenni Lund 22 May '10

22 May '10

Hi Is it expected behaviour that a libvirt NAT-based network is faster than a libvirt routed network? I would guess that the routed network would be the fastest one in all cases, but I'm seeing the opposite in my setup. On a 100mbit internet connection, the routed network tops at 4mbyte/sec, while the nat-based network goes all the way to 10mbyte/sec. I've spend the last 6 hours on trying to figure out the cause of this, changing settings, reinstalling the system, but the problem persists and I can't find the cause of it. It is a clean and fairly simple setup: - Clean installation of CentOS 5.5 - Installation of kvm+libvirt+virt-manager+xorg - iptables service disabled - 1 public IP for the host (xxx.yyy.zzz.215) on a /32 subnet with xxx.yyy.zzz.193 as gateway - 3 public IP for the routed network (xxx.yyy.zzz.251-253) on a /26 subnet with the same gateway as the host - 1 virtual machine with either the NAT or the routed libvirt network assigned I have no networking connection errors or similar, it works perfectly with both the NAT and the routed network, but the routed network is just 2-4 times slower than the NAT one. Do you have any suggestions of what the problem might be? When I look at the iptables rules generated by libvirt, and the routing table, everything looks fine AFAICT. Traceroute from guest doesn't reveal anything either. Ping times from the two networks are similar, so the main issue seems to be throughput. Any help or pointers to what I should look at, is highly appreciated... :) I've copy pasted some of my relevant system configuration into pastebin: http://pastebin.com/jtTrHLqA Thank you, Kenni

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[libvirt-users] Update of libvirt website required. not all information about XML tags
by Марк Коренберг 21 May '10

21 May '10

The problem desribed here: https://bugzilla.redhat.com/show_bug.cgi?id=593266 Please update http://www.libvirt.org/formatdomain.html and describe NEW xml tags, like <serial>xxxx</serial> for hard drive and all cpu tags, other if any. -- Segmentation fault

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[libvirt-users] ctrl+alt+2 disabled?
by Ralf Hornik Mailings 19 May '10

19 May '10

Dear list, I need to attach pci devices using qemu command interface but when I use the vnc connection started using virsh, the key combination (or qemu interface) seems to be disabled. How can I (re)enable it? Thanks and best regards Ralf

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[libvirt-users] Can't get audio device through virt-manager
by Arthur Pemberton 18 May '10

18 May '10

virt-manager is not asking qemu to produce any sound device based on the kvm-qemu I see with 'ps aux' https://bugzilla.redhat.com/show_bug.cgi?id=592671 -- Fedora 11 (www.pembo13.com)

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[libvirt-users] learn XML <network/>
by Michael Löblich 18 May '10

18 May '10

Can please anybody write a XML-description for the diagram shown on http://libvirt.org/archnetwork.html Michael

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[libvirt-users] virsh domxml-from-native not working
by Ralf Hornik Mailings 17 May '10

17 May '10

Dear list, when I try to convert the (working) command /usr/bin/qemu-system-x86_64 \ -drive file=/dev/xen_vol/xen_ca,cache=none,if=virtio,boot=on \ -net nic,model=virtio,macaddr=00:16:3E:04:F5:6D \ -net tap,ifname=tap1 -m 256 -name ca \ -vnc 10.0.0.100:4 -daemonize -k de into an xml file: <domain type='qemu'> <name>ca</name> <uuid>dfef3884-d7a9-f6cf-5204-1615963cc0e8</uuid> <memory>262144</memory> <currentMemory>262144</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64'>hvm</type> </os> <features> <acpi/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu-system-x86_64</emulator> <disk type='block' device='disk'> <driver cache='none'/> <source dev='/dev/xen_vol/xen_ca'/> <target dev='vda' bus='virtio'/> </disk> <interface type='ethernet'> <mac address='00:16:3e:04:f5:6d'/> <target dev='tap1'/> <model type='virtio'/> </interface> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5904' autoport='no' listen='10.0.0.100'/> <video> <model type='cirrus' vram='9216' heads='1'/> </video> </devices> </domain> Then it stops to boot while haning on "Loading Grub Stage 2". Additionally, the keyboard encoding "de" is missing. The corresponding process is: /usr/bin/qemu-system-x86_64 -S -M pc-0.12 -no-kvm -m 256 \ -smp 1,sockets=1,cores=1,threads=1 \ -name ca -uuid dfef3884-d7a9-f6cf-5204-1615963cc0e8 \ -nodefaults \ -chardev socket,id=monitor,path=/usr/local/libvirt/var/lib/libvirt/qemu/ca.monitor,server,nowait \ -mon chardev=monitor,mode=readline -rtc base=utc -boot c \ -drive file=/dev/xen_vol/xen_ca,if=none,id=drive-virtio-disk0,boot=on,cache=none \ -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 \ -device virtio-net-pci,vlan=0,id=net0,mac=00:16:3e:04:f5:6d,bus=pci.0,addr=0x5 \ -net tap,ifname=tap1,vlan=0,name=hostnet0 -usb -vnc 10.0.0.100:4 \ -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 Any Ideas, hats going wrong? Thank yout and best regards Ralf Hornik

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[libvirt-users] Sharing same storage on two diffrent KVM hosts
by shy Perets 17 May '10

17 May '10

Hello , I whould like your suggestion regarding the following problem : I got 2 host which are running under RHEL5.4 hypervizor . both of the hosts disks is a logical volume .( Each for each ) under the same VG . I want to add storage ( another logical volume ) which will be availble for both of the host as local disk . ( Share storage ) Thanks .

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