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[libvirt-users] qemu-kvm version for CentOS
by kerwin 08 Jul '14

08 Jul '14

WHY CentOS still using qemu-kvm 0.12? What I am need is high version of qemu-kvm for CentOS, but seems like they do not officially provide newest qemu, only qemu 0.12 source code with 3522 patched rpm package. Is there any reasonable to keep low version for qemu-kvm ? or what should I do if I need newest qemu-kvm rpm package? ✉ -- 朴元奎 kerwin

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[libvirt-users] virsh: cannot start domain with channel device,
by John 07 Jul '14

07 Jul '14

Here is what I got. root ubuntu:/home/john# virsh start ubuntu2 error: Failed to start domain ubuntu2 error: internal error Process exited while reading console log output: char device redirected to /dev/pts/1 bind(unix:/var/lib/libvirt/qemu/ubuntu2.libguestfs): Permission denied chardev: opening backend "socket" failed: Permission denied root ubuntu:/home/john# ll /var/lib/libvirt/qemu/ total 20 drwxr-x--- 5 libvirt-qemu kvm 4096 Jul 5 14:44 ./ drwxr-xr-x 8 root root 4096 May 20 04:18 ../ drwxr-xr-x 2 libvirt-qemu kvm 4096 May 20 04:18 dump/ drwxr-xr-x 2 libvirt-qemu kvm 4096 May 20 04:18 save/ drwxr-xr-x 2 libvirt-qemu kvm 4096 May 20 04:18 snapshot/ root ubuntu:/home/john# cat /etc/libvirt/qemu/ubuntu2.xml  <domain type='kvm' xmlns:qemu='/schemas/domain/qemu/1.0'> <qemu:commandline> <qemu:arg value='-s'/> </qemu:commandline> <name>ubuntu2</name> <uuid>03f4c36d-9509-05dd-167d-d2613d1dd883</uuid> <memory>1024000</memory> <currentMemory>1024000</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64' machine='pc-1.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/home/john/ubuntu-1204-vm.img'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='bridge'> <mac address='52:54:00:d4:7d:07'/> <source bridge='br0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes'/> <sound model='ich6'> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> <video> <model type='cirrus' vram='9216' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </memballoon> <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/ubuntu2.libguestfs' /> <target type='virtio' name='org.libguestfs.channel.0' /> </channel> </devices> </domain> When I deleted the <channel>...</channel> part, it will start normally. But I need it to use guestfish with --live option. No SELinux or AppArmor is used. qemu.conf shows it's running by root user. I did "virsh start" operation under root and the error remains. Should I change the permission attributes of files under /var/lib/libvirt/qemu ?

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[libvirt-users] Source code of virt-manager
by Restituto Marcus Arevalo 07 Jul '14

07 Jul '14

Hi, Does anyone know where I could view the source code of virt-manager? Because I'm trying to learn how the virt-manager gets the CPU usage of a VM(the graph it displays). I'm trying to make a program using java that gets the CPU usage of a VM in KVM. Anybody have suggestions on where I could start?Thanks regards, Marco

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[libvirt-users] virsh blockcopy: doesn't seem to flatten the chain by default
by Kashyap Chamarthy 05 Jul '14

05 Jul '14

Versions -------- (Libvirt locally built from a recent git commit -ec7b922): $ rpm -q libvirt-daemon-kvm qemu-system-x86 libvirt-daemon-kvm-1.2.6-1.fc20.x86_64 qemu-system-x86-2.0.0-1.fc21.x86_64 Test ---- [All images are qcow2 files.] We have this simple chain: base <- snap1 Let's quickly examine the contents of 'base' and 'snap1' images: 'base' has just a single file: foo $ guestfish --ro -a base.qcow2 [. . .] ><fs> ls / ><fs> run ><fs> mount /dev/sda1 / ><fs> ls / foo lost+found ><fs> quit 'snap1' has files: bar, baz, jazz $ guestfish --ro -a snap1.qcow2 [. . .] ><fs> run ><fs> mount /dev/sda1 / ><fs> ls / bar baz jazz lost+found ><fs> Now, let's do a live blockcopy (with a '--finish' to graecully finish the mirroring): $ virsh blockcopy --domain testvm2 vda \ /export/dst/copy.qcow2 \ --wait --verbose --finish Examine the contents of the above 'copy': $ guestfish --ro -a copy.qcow2 [. . .] ><fs> run ><fs> mount /dev/sda1 / ><fs> ls / bar baz jazz lost+found ><fs> quit If I'm reading the man page of 'blockcopy' correctly, shouldn't it 'flatten' the entire chain, by also copying the contents of base into copy.qcow2? i.e. the 'copy' should have files (including the file foo from 'base': foo, bar, baz, jazz True or false? PS: I've tested the cases of --pivot, --shallow and --reuse-external, will post my notes about them on a wiki. -- /kashyap

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[libvirt-users] Acces to hypervisor from a KVM guest
by Jean-Pierre Ribeauville 04 Jul '14

04 Jul '14

Hi, >From a KVM guest, I want to retrieve the hostname of the host on which the hypervisor is running. Before doing that by using libvirt API, I first try via virsh. So, I run virsh and the run hostname command.( got that in virsh help : .... hostname print the hypervisor hostname ....) Unfortunately, I got following error when starting virsh : error: Failed to reconnect to the hypervisor error: no valid connection error: internal error Unable to locate libvirtd daemon in /usr/sbin (to override, set $LIBVIRTD_PATH to the name of the libvirtd binary) Do I miss to install some package on my KVM guest ? or is it not the right way to get this information ? Any help is welcome. Thx. [cid:image001.png@01CF75CE.35F97F50] Jean-Pierre RIBEAUVILLE Developer Tel: 01 49 11 45 81 Discover Systar's Videos!<https://www.youtube.com/channel/UCvyaJkMXCGFo8_XZYd9rcBw> P Please consider the environment before printing this e-mail

2 1

[libvirt-users] os/type/machine/pc-xxxx meaning ? following live migration issue after an upgrade
by Benoit Rousselle 04 Jul '14

04 Jul '14

Dear All, I have upgrade my hypervisors: qemu-kvm 0.12.5 => 1.1.2 libvirt-bin 0.8.3-5 => 0.9.12.3 (debian6 to debian7) After that upgrade, i noticed that live migration was most of the time failing (freeze) (not always) I also noticed that creating a machine with the updated hypervisor was always working. After some days of investigation mainly on network side, i found this setting that seems to fix the issue in the xml: <os> <type arch='x86_64' machine='pc-0.12'>hvm</type> <boot dev='hd'/> </os> replacing pc-0.12 with pc-1.1 seems to fix the issue. Here are my questions : 1) what is the meaning/purpose of that setting ? (i guess it is somehow linked to the version of kvm ;) ) 2) can i just change it in all xmls ? ( i have plenty of linux/windows flavors running in my vms) 3) is it possible to put a more generic value? So we don't have the same issue on next upgrade. 4) Is there a script/doc that explains what needs to be done on the vm itself (xml or other) when we upgrade libvirt/kvm ? Thanks for the feedback ! Benoit. -- Benoit Rousselle

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[libvirt-users] getting CPU usage of VMs through libvirt
by Restituto Marcus Arevalo 04 Jul '14

04 Jul '14

Greetings everyone, I just want to ask if it is possible to get the CPU usage of the VMs in KVM through libvirt? I mean, how does the virt-manager produce the graph it displays? Is there a way get this graph? But instead of the graph itself, I just need to get it in percentage(%) form. I'd like to know how. Thank you and your help will be greatly appreciated. regards, Marco

2 1

[libvirt-users] Domain Storage type
by Sijo Jose 04 Jul '14

04 Jul '14

Hi, How can we identify a domain is using Shared storage OR Non shared storage using libvirt -API? Rgds -Sijo

2 1

[libvirt-users] How can I setup a privileged container
by WANG Cheng D 02 Jul '14

02 Jul '14

Dear all, I want to setup a privileged container, which means I can set the priority of a process to SCHED_RR (real-time) dynamically by calling sched_setscheduler() in a C program running on a container. In my system (host: fedora19, container: fedora19, libvirt 1.2.5), my C code reports "operation not permitted" when sched_setscheduler() is called. I found a link (https://www.redhat.com/archives/libvir-list/2014-June/msg00562.html) which is talking about container capability drops and keeps, but only "nice" is mentioned and I don't know how to turn on "priority" feature on a container? Any comments are highly appreciated. Cheng

1 0

[libvirt-users] all windows vm could not start because the following file is missing or corrupt
by Lucas -LandM- 02 Jul '14

02 Jul '14

Hi, After some problems in the server I can't start windows XP virtual machines. - Yesterday we got full disk (100%). I deleted some files. Solved. - I update Centos 5.6. I guess libvirt was updated from 0.9 to 0.10. We have to use this kernel: 2.6.32-042stab079.6 because this bug is not in the release: https://bugzilla.openvz.org/show_bug.cgi?id=2915 Now, I try to start windows XP machines and all give me same error could not start because the following file is missing or corrupt c:\WINDOWS\SYSTEM32\CONFIG\SYSTEM If this error were in a particular VM I try to solve it manually, but same error in three diferent VM is not a coincidence. I suppose it is a upgrade issue. What should I do? Thanks in advanced, Lucas

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