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[libvirt-users] Libvirt 1.2.6 patch for Hyper-V 2012 R2 ?
by Evgeny Vasilchenko 08 Jul '14

08 Jul '14

Hello, Does anyone know if the below patch for libvirt 1.2.4 has been integrated into the libvirt 1.2.6 source code? http://www.redhat.com/archives/libvir-list/2014-May/msg00509.html https://github.com/vikhyath/libvirt-hyperv-r2-2012 Thank you! Evgeny

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[libvirt-users] libvirt behind stunnel4
by Parthipan 08 Jul '14

08 Jul '14

Hi, I'm trying this setup where an stunnel4 (listening for clients on port 16514) connects to an unencrypted libvirt backend (on port 16509). When I point the virsh client to stunnel4 it hangs. Looking via tshark: 1. virsh completes ssl handshake with stunnel4 2. stunnel4 completes tcp handshake with libvirt. and that's all. When connecting virsh client directly to libvirt (this time encrypted) tshark shows: 1. virsh completes ssl handshake with libvirt (change cypher spec at the end) 2. libvirt sends something (I can't decode what libvirt sends, since DH key exchange is used.) Anyway my question really is, can libvirt be run as an unencrypted backend behind an ssl offloader such as stunnel4? If people do use it like that, then I can look for any setup issues in mine. My package versions: libvirt: 1.2.2-0ubuntu13.1 stunnel4: 3:4.53-1.1ubuntu1 Thanks ~parthi

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[libvirt-users] How to get uuid info inside a lxc container created by libvirt_lxc
by Qiang Guan 08 Jul '14

08 Jul '14

Hi , Is there anyway to get uuid info inside a lxc container which is created by libvirt_lxc? For kvm, we can use dmidecode or lshw to get this info inside vm. Is there any tools to do this thing for libvirt lxc? Thanks for any help~ -- ------------ Jackie Best Regards

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[libvirt-users] follow-up to thread : Acces to hypervisor from a KVM guest, ( by the way , how to enter a follow up in a thread ?) Thx
by Jean-Pierre Ribeauville 07 Jul '14

07 Jul '14

Hi, This is what I tried : Y , how enter an answer in the thread ?) virsh -c qemu+ssh://127.0.0.1:22/system hostname root(a)127.0.0.1's<mailto:root@127.0.0.1's> password: error: End of file while reading data: : Input/output error error: failed to connect to the hypervisor In another hand ,as we have few information to share , I was thinking to use a virtio channel to dialog between host and guest . Does it fit ? Thx J.P. ? -----Message d'origine----- De : Eric Blake [mailto:eblake@redhat.com] Envoyé : vendredi 4 juillet 2014 15:20 À : Jean-Pierre Ribeauville; libvirt-users(a)redhat.com<mailto:libvirt-users@redhat.com> Objet : Re: [libvirt-users] Acces to hypervisor from a KVM guest On 07/04/2014 04:23 AM, Jean-Pierre Ribeauville wrote: > 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. Well, virsh just uses the libvirt API under the hood. I'd suggest that you try: virsh -c qemu://host/system hostname except that this is a chicken-and-egg situation, because virsh in the guest doesn't know what host to connect to. If you are using the out-of-the-box NAT setup, then you could use qemu://192.168.122.1/system, since your guest will be using an IP address assigned from that subnet from the host. Other than that, libvirt is not really designed for guest-to-host communication, but for host management of guests. You'll have to solve your problem in some other way. Consider the same situation with bare metal hosts - if you are provisioning a cluster, and want machines in the cluster to communicate to a particular controller, but not all machines connect to the same controller, how would you do that? If you can solve that problem, then you can use it to solve your guest provisioning problem. > 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) This failure is because you did not use -c to connect to a remote daemon, but don't have libvirtd running in the guest. You do not need libvirtd running locally to use virsh for remote connections, but you do need to know where the remote connection lives. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org [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

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[libvirt-users] getting CPU usage through virsh command or libvirt API
by Restituto Marcus Arevalo 07 Jul '14

07 Jul '14

Hi, Is it possible to get the CPU usage of a guest through a virsh command? I have tried almost all the commands (vcpuinfo, cpu-stats, etc.) that gets the details of a guest cpu, but it only returns the cpu time. Is there any command that returns the cpu usage (just like the graph that virt-manager displays) of a guest? Or do I have to create a program using libvirt API? Thanks in advance. regards, Marco

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[libvirt-users] qemu-kvm version for CentOS
by kerwin 07 Jul '14

07 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 04 Jul '14

04 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

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