December 2014 - Users - libvirt List Archives

[libvirt-users] virRandomBits - not very random
by Brian Rak 01 Jun '18

01 Jun '18

I just ran into an issue where I had about 30 guests get duplicate mac addresses assigned. These were scattered across 30 different machines. Some debugging revealed that: 1) All the host machines were restarted within a couple seconds of each other 2) All the host machines had fairly similar libvirtd pids (within ~100 PIDs of each other) 3) Libvirt seeds the RNG using 'time(NULL) ^ getpid()' This perfectly explains why I saw so many duplicate mac addresses. Why is the RNG seed such a predictable value? Surely there has to be a better source of a random seed then the timestamp and the pid? The PID seems to me to be a very bad source of any randomness. I just ran a test across 60 of our hosts. 43 of them shared their PID with at least one other machine.

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[libvirt-users] Freeze Windows Guests For Consistent Storage Snapshots
by Payes Anand 09 Jun '15

09 Jun '15

Hi, Is it possible to freeze windows guests for a consistent storage level snapshot. I am using openstack icehouse on centos 6.6 Hypervisor: KVM Libvirt: 0.10.2 Qemu: 0.10.2 Guest OS: Windows 7 and Windows Server 2008 I was able to freeze Centos guests by issuing the command: virsh qemu-agent-command <guest_ID> '{"execute":"guest-fsfreeze-freeze"}' For CentOS guests, I enabled access between compute nodes and guests through a socket by setting metadata parameter, hw_qemu_guest_agent=yes for the guest image. And then installing qemu-guest-agent inside the guest. What steps do i have to follow for windows ? Regars, Payes

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[libvirt-users] Using virsh blockcopy -- what's it supposed to accomplish?
by Gary R Hook 09 Jan '15

09 Jan '15

I am experimenting with the blockcopy command, and after figuring out how to integrate qemu-nbd, nbd-client and dumpxml/undefine/blockcopy/define/et. al. I have one remaining question: What's the point? The "replication" disk file is not, from what I can ascertain, bootable. I expect this operation to create a pristine copy of my source qcow2 file (at a given point in time) which implies that I can swap that copy in and use it just like the original. Neither using --finish nor --pivot (both appear successful) give me a mirror that seems to serve any purpose. It seems especially pointless if I use --pivot because anything that happens after the pivot ends up lost if I don't actually have a usable qcow2 file. I find lots of discussion online about getting the steps to work, but as yet find nothing about using the resulting file. What am I missing here? libvirt (1.2.2) and qemu (2.2.0) as distributed with Ubuntu Trusty. -- Gary R Hook Senior Kernel Engineer NIMBOXX, Inc

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[libvirt-users] Please help me!Thank You!
by 75124955 04 Jan '15

04 Jan '15

I am using Libvirt virsh command by vmware esx created a virtual host, has been unable to create success. My creation process is as follows : Create a virtual host XML file content is as follows: <domain type='vmware'> <name>test1</name> <memory>524288</memory> <currentMemory>524288</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64'>hvm</type> </os> <devices> <disk type='file' device='disk'> <source file='[datastore1 (2)] test1/test1.vmdk'/> <target dev='sda' bus='scsi'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <controller type='scsi' index='0' model='vmpvscsi'/> <controller type='ide' index='0'/> <interface type='bridge'> <source bridge='VM Network'/> </interface> </devices> </domain> Has been unable to create the VMDK files, can you tell me what reason be? Thank you very much ! I will always wait for your reply, this problem is very important to me.

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[libvirt-users] Console access for a user.
by Le Bris Gilles 02 Jan '15

02 Jan '15

Hi, I would like to allow a user (non-root) to access the console of his VM (he's got root access on it). Using sudo doesn't seem to work: /bin/virsh console vm error: failed to get domain 'vm' error: Domain not found: no domain with matching name 'vm' If I assign suid to virsh, I get: 'error: Failed to initialize libvirt' I don't see any information on Internet about this. What is the procedure to follow to get this result (QEMU conf, libvirt conf, etc)? Thank you in advance.

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[libvirt-users] Bhyve drv creates duplicate tap0 references
by William B 29 Dec '14

29 Dec '14

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Good morning, I am not sure if this is a known issue or if I should raise as a bug. When using libvirt 1.2.11 on FreeBSD 10.1-RELEASE with bhyve, I have notice that a machine which defines: <interface type='bridge'> <mac address='52:54:00:88:44:08'/> <source bridge='bridge10'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </interface> <interface type='bridge'> <mac address='52:54:00:42:8f:c1'/> <source bridge='bridge11'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> Generates a bhyve command from domxml-to-native that contains the interfaces such that: - -s 2:0,virtio-net,tap0,mac=52:54:00:88:44:08 -s 3:0,virtio-net,tap0,mac=52:54:00:42:8f:c1 As a result, in this configuration, no network traffic works due to the duplication of the tap0 device in each command. When running two machines simultaneously, both are allocated to tap0, again causing issues. Is this a known issue? Please include me in replies as I am offlist. - -- Sincerely, William Brown -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBAgAGBQJUoeiHAAoJEO/EFteBqAmaA2EP/ixYU792vc4K41jnI2Z+cC11 PVMEI4YFiaBwU4xBE7FpOrgnz/oVOKE5r4/PYM+M+c460yJMeEHbUQ3haH0meciN TuiOBB2uOx2mvaPBbOKL2Kd8u3poR7nBwwisDD6M81HhCGNan1uFoTzCXswZGlEn C0EgXHh2wTUVl3HWYbKXW6WmuhYTn8IHuPFjWNKGwJdHOzVYOPfmIiMU/qLlNNG1 FEjf+FS9yjuzBFSa6QszQG10DSPNJ6KghDxCVj2hUl0FHHcYbukbHa4FGwc261i0 h6MII67/27ZIaYA+7yqL2A9pa4Pj1FQ/IWWzuemG4TAbETLIEps4PrFvXLHgX0l/ KYE/5vysYrWjNXs6RXQwEcRBPxOHxhrAdl2t6FkYDSGf27WIwEepSPlo3r/bCenZ 5z6RkIq3HRdZy4bnZPcy1hUOOKKDrq2PXRJ3DIWDktfmpHf+IyCBb7jEKUQU8cL8 4ODeHFrQ8RcvEmXvLHk8Gt1y5/cOhs2VI9JDf0IZLfPi3+OETDY54pI7PPkv8mya LmDS9YdmDfAdks/wTX1a4F80g0m4qR5X9HvgUu0bGSq3k5mefRFzi3PLf45tiKXo 9kEYrq9wmd2b4YIdPzdANE/NAz9sLM/phJNqSoVbHhxgOtAMNr2XPs0l9J/e2cUa OuFCyESOu2iKL3C5fCU1 =tL0W -----END PGP SIGNATURE-----

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Re: [libvirt-users] Using virsh blockcopy -- what's it supposed to accomplish?
by Gary R Hook 24 Dec '14

24 Dec '14

On 12/23/14 2:08 PM, Eric Blake wrote: > On 12/23/2014 11:35 AM, Gary R Hook wrote: >> On 12/22/14 4:50 PM, Eric Blake wrote: >>> On 12/22/2014 03:27 PM, Gary R Hook wrote: >>>> I am experimenting with the blockcopy command, and after figuring out >>>> how to integrate qemu-nbd, nbd-client and >>>> dumpxml/undefine/blockcopy/define/et. al. I have one remaining question: >>>> >>>> What's the point? >>> >>> Among other uses, live storage migration. >> >> There is so very much to say here, but I will endeavor to be brief and >> to the point. Please note that I am working with libvirt 1.2.2, as >> stated in my OP. And up front; I'm pretty sure I'm missing data points >> and working from a position of ignorance and unreasonable expectation. > > Did you mean for this to go to the list? Usually, having discussions > like this in public archives will benefit more people, and allow others > to chime in. > > https://rwmj.wordpress.com/2010/11/08/want-help-dont-email-me-directly/ Dang, dang, dang, dang, dang. Yes, of course I did. *sigh*. Will resend to the list. Please ignore. -- Gary R Hook Senior Kernel Engineer NIMBOXX, Inc

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[libvirt-users] "virsh list" does not show anything after reboot [newbie]
by Kevin Wilson 23 Dec '14

23 Dec '14

Hi, libvirt users and gurus, I am a newbie to visualization, hope this question is not too silly, please bear with me. I had installed three guest on Fedora 21 with the virt-install tool, by: virt-install --name=f21_x86_64_guest --file=/var/lib/libvirt/images/guest.qcow2 --cdrom /workStorage/work/down/f21/Fedora-Live-Workstation-x86_64-21-5.iso --ram=2048 virt-install --name=f21_x86_64_guest1 --file=/var/lib/libvirt/images/guest.qcow2 --cdrom /workStorage/work/down/f21/Fedora-Live-Workstation-x86_64-21-5.iso --ram=2048 --force virt-install --name=f21_x86_64_guest2 --file=/var/lib/libvirt/images/guest.qcow2 --cdrom /workStorage/work/down/f21/Fedora-Live-Workstation-x86_64-21-5.iso --ram=2048 --force When runing "virsh list" I see these three guests as running. Now, I rebooted the machine, and "virsh list" does not show anything. It turned out that running "systemctl status libvirtd" showed some error (about some NFS path which was not found), and once I fixed that, I restarted the libvirtd, and this time running "systemctl status libvirtd" showed that it is running OK. Yet, runnig "virsh list" does not show anything Any ideas ? what I should do to run one of these guest I created before booting the machine ? Regards, Kevin

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[libvirt-users] why CPU pinning doesn't take effect when using lxc-enter-namespace to run an application
by WANG Cheng D 23 Dec '14

23 Dec '14

Dear all, I want my container to run on the third CPU core and I define this by the following xml scrpits: <vcpu placement="static" cpuset="3">1</vcpu> When I run my application in a container terminal, I can see the application runs on the third core as expected. When I run my application using lxc-enter-namespace, the CPU pinning doesn't take effect, i.e., the application runs on a core which isn't the third one. How can I solve this problem? Any replies are highly appreciated. Cheng

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[libvirt-users] Device attach event
by Marek Marczykowski-Górecki 22 Dec '14

22 Dec '14

Hi all, I'm trying to use libvirt events API, but I can't find what event is fired when some device (disk in this case) got attached to the domain. In the docs I see only VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED, but not VIR_DOMAIN_EVENT_ID_DEVICE_ATTACHED. Is there some event for that? BTW libxl driver implements only VIR_DOMAIN_EVENT_ID_LIFECYCLE, but that's another story... -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing?

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[libvirt-users] Virtual machine removal through command line.
by Le Bris Gilles 20 Dec '14

20 Dec '14

Hi, Until today, I hadn't found a way to cleanly remove a KVM virtual machine through command line on CentOS 6 or 7! I had to run 'systemctl restart libvirtd' or 'service libvirtd restart' After several months (!!!), I found this thread: https://github.com/pradels/vagrant-libvirt/issues/107 Now, I know how to cleanly remove a KVM virtual machine (with default file location): virsh destroy vm.example.com virsh undefine vm.example.com --managed-save /bin/rm /var/lib/libvirt/images/vm.example.com.img /bin/rm /var/log/libvirt/qemu/vm.example.com.log virsh vol-delete /var/lib/libvirt/images/vm.example.com.img --pool default I don't know if the last command ('virsh vol-delete' avoiding the libvirtd restart) is a bug or a feature but it must be documented! Only a libvirt developer can guess something like this. Feel free to change my instructions in any way you think it's better but at least document this in a public place (http://wiki.libvirt.org for example). Regards.

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[libvirt-users] LVM storage
by Boylan, Ross 19 Dec '14

19 Dec '14

Hi. I have some narrow questions and a larger one. If I make an existinig LVM VG a storage pool, can I use some of the LV's for libvirt and some for the host? Or does the VG needed to be completely dedicated to virtualization? Assuming mixed use is possible, is it possible to do an LVM snapshot of an LV in use for a VM? The snapshot would have to be initiated and used on the host, I assume. How dynamic is this? If I create a new LV, is it possible to see that immediately from, e.g., virt-manager and add it as a virtual disk to a running VM? If I resize the LV, will the VM know so that, e.g., I could do an online resize of the filesystem? My larger question is what the recommendations are for managing disks or LV's with libvirt and KVM on Linux. In particular, I'd like to be able to grow storage space as the the VM needs grow, and snapshot (in the LVM sense) some of the block devices behind filesystems for backup. Although it would be nice to grow space while the VM's are running, it's not a requirement. Following advice on the KVM list, I have been using raw LV's as virtual disks for the VM's. The host is currently running with a large, encrypted LVM VG. It would be convenient to use it for the VM's.

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[libvirt-users] virsh list shows no vm after downgrade
by Chengyuan Li 19 Dec '14

19 Dec '14

Hi, I was running libvirt 1.2.2 and qemu 2.0 which are from icehouse cloud archive repo on ubuntu 12.04, "virsh list --all" showed correct instances after launching several VMs, Then I just downgraded libvirt to 0.9.13 and qemu to 1.0, but kept the VMs running. However, when I run "virsh list --all" after downgrade, I can't see any VMs. Seems that the old version libvirt 0.9.13 doesn't know the instances created by libvirt 1.2.2. Does anyone know how to solve this problem? Regards, Chengyuan.

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[libvirt-users] virsh list shows no vm after downgrade
by Chengyuan Li 19 Dec '14

19 Dec '14

Hi, I was running libvirt 1.2.2 and qemu 2.0 which are from icehouse cloud archive repo on ubuntu 12.04, "virsh list --all" showed correct instances after launching several VMs, Then I just downgraded libvirt to 0.9.13 and qemu to 1.0, but kept the VMs running. However, when I run "virsh list --all" after downgrade, I can't see any VMs. Seems that the old version libvirt 0.9.13 doesn't know the instances created by libvirt 1.2.2. Does anyone know how to solve this problem? Regards,Chengyuan.

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[libvirt-users] detachFlags permissions and ownership
by Martin Polednik 18 Dec '14

18 Dec '14

Hello everyone, I would like to ask why detachFlags doesn't change the ownership/permissions of /dev/vfio/XX in order to be readable (possibly writable, is that required?). Is there any way to accomplish this without custom udev rules/scripts or is it handled only when using "managed=yes" mode for 'hostdev' type devices? Regards, mpolednik

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[libvirt-users] Again with same Cgroup issue :)
by mad Engineer 17 Dec '14

17 Dec '14

Hello All, From the last couple of days i have been spamming this mailing list with request for configuring Cgroup with libvirtd on Centos systems. I still can not find a permanent solution to limit host RAM to particular value,tried creating a separate hierarchy "mykvm" and changed in sysconfig/libvirtd after that vm's memory cgroup reflects this.But it is not obeying "memory.limit_in_bytes" set in "mykvm" group,i als specified it in cgrules.conf and restarted it.If i change that in "/cgconfig/memory/mykvm/libvirt/qemu/memory.limit_in_bytes " its working.But that is dynamic as i am not able to find a way to mention that in "cgconfig.conf". How can i make sub hierarchies follow what is set in parent cgroup? eg: if change variables in "/cgconfig/memory/mykvm" then all instances coming under "/cgconfig/memory/mykvm/libvirt/qemu/" should follow that value..How is it possible.Can you please help

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[libvirt-users] How to use blockcopy in libvirt-java
by Star Guo 16 Dec '14

16 Dec '14

Hi, ALL, I just look for the class and method to use blockcopy in libvirt-java on this page: http://libvirt.org/sources/java/javadoc/ However, I can not find out. Libvirt-java Support blockcopy ? Thanks. Best Regards, Star Guo

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[libvirt-users] C group hierarchy and libvirtd
by mad Engineer 15 Dec '14

15 Dec '14

On Centos 6.4 x64,with libvirt-0.10.2-18.el6.x86_64 i am trying to set "memory.limit_in_bytes" for all qemu process. changed "cgconfig.conf" group mygroup{ perm { admin { uid = root; gid = root; } task { uid = qemu; gid = kvm; } } memory { memory.limit_in_bytes = 61G; } } and also added "CGROUP_DAEMON=memory:/mygroup" in sysconfig/libvirtd and in cgrules.conf and then restarted services. Now i can see created virtual machines use cgroup hierarchy "/cgroup/memory/mygroup/libvirt/qemu/virtualmachine1/" instead of "/cgroup/memory/libvirt/qemu/virtualmachine1/". The issue is "memory.limit_in_bytes" set to "mygroup" is getting applied only to libvirtd process.VM are not following memory.limit_in_bytes set to "mygroup". 1. how can i set this globally so that all virtual machines follow that, i dont want to create a new group for that if libvirt supports it. 2.Is there any way i can avoid extra hierarchy and create virtual machines memory cgroup under "/cgroup/memory/kvm/" instead of "/cgroup/memory/mygroup/libvirt/qemu/" ? please help me fix this issue.I have this working on ubuntu servers where i specified "libvirt-qemu" user and VMs follow that cgroup for memory. Regards,

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[libvirt-users] Difficulty configuring Cgroups on redhat/centos
by mad Engineer 14 Dec '14

14 Dec '14

Hello All, i am trying to set "memory.limit_in_bytes" for all process created by libvirt.But i am not able to achieve this on RHEL systems in Ubuntu servers creating memory cgroup for "libvirt-qemu" user solves the issue.But in case of RHEL system i tried to create a group by editing "cgconfig.conf" and then changing cgrules.conf and restarted cgconfig and libvirtd but still virtual machines are not following what is mentioned in config,instead they follow cgroup libvirt/qemu/virtualmachine-name ,is there any way i can set global cgroup values for all process rather editing each process configuration or how can i configure libvirt to use new configuration file and use that group instead of default libvirt/qemu/ cgroup. /etc/cgconfig.conf mount { cpuset = /cgroup/cpuset; cpu = /cgroup/cpu; cpuacct = /cgroup/cpuacct; memory = /cgroup/memory; devices = /cgroup/devices; freezer = /cgroup/freezer; net_cls = /cgroup/net_cls; blkio = /cgroup/blkio; } group kvm { perm { admin { uid = root; gid = root; } task { uid = qemu; gid = kvm; } } memory { memory.limit_in_bytes = 61G; } } and this on cgrules.conf qemu memory kvm Thanks for your help

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[libvirt-users] Does libvirt support HyperV Server 2012?
by Pillai, Padmakumar 12 Dec '14

12 Dec '14

Hi, I wanted to know whether libvirt-1.2.10 supports HyperV Server 2012 and/or SCVMM Server 2012. There is a requirement for us to deploy a VHD image to the HyperV Server 2012 SP2. We are planning to do this using libvirt-1.2.10. Thanks Paddy

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[libvirt-users] How to use blockcopy in libvirt-java
by Star Guo 11 Dec '14

11 Dec '14

Hi, ALL, I just find the page on git: https://github.com/qemu/qemu/blob/master/docs/live-block-ops.txt This metion “Live block copy”, so Live Block Copy is the feature of live-block-ops. And what about the live-block-migration ? Best Regards, Star Guo 发件人: Star Guo [mailto:starg@ceph.me] 发送时间: 2014年12月10日 18:17 收件人: 'libvirt-users(a)redhat.com' 抄送: 'libvir-list(a)redhat.com' 主题: How to use blockcopy in libvirt-java Hi, ALL, I just look for the class and method to use blockcopy in libvirt-java on this page: http://libvirt.org/sources/java/javadoc/ However, I can not find out. Libvirt-java Support blockcopy ? Thanks. Best Regards, Star Guo

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[libvirt-users] virDomainSetMemoryStatsPeriod autostart
by Gleb Voronich 10 Dec '14

10 Dec '14

Hello, A collecting period should be set to get domain memory stats (virDomainSetMemoryStatsPeriod function or virsh dommemstat --period from command line). Is there a way to set this period automatically using XML config or any other way?

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[libvirt-users] Two identical hosts, different capabilities and topologies
by Davide Ferrari 09 Dec '14

09 Dec '14

Hello, I've two twin servers (Dell PowerEdge R815) dedicated to kvm+libvirt and they have the same exact CPU (AMD Opteron(TM) Processor 6272) with the same topology (2 sockets, 16 cores per socket, so a total of 32 CPUs seen by the kernel) but both virsh -r capabilities and virsh nodeinfo say that the two machines are different - but they really are not! - and this prevents live migration from one server to another (but the other way round works). Attached you will find the output of some programs, if you need more info just ask. They are both running Debian Wheezy with latest backported kvm/libvirt (libvirt-daemon 1.2.9-6~bpo70+1). A curious fact is that kvm-host-01 detects the wrong topology (1 socket, 32 cores per socket) but it displays more capabilities, so migrating from kvm-host-02 -> kvm-host-01 works but from 01 to 02 fails. Any idea? Thanks in advance

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[libvirt-users] snapshots and qcow2
by Laszlo Hornyak 09 Dec '14

09 Dec '14

Hi, I ran into a strange behavior with libvirt snapshots. I have some vms running with thin-provisioned qcow2 disk images (libvirt 1.1.3 with fedora 20). * When I create a snapshot on the VM, the qcow file suddenly grows big, somewhat bigger than the maximum size of the disk. * When I delete the snapshot, the allocated disk space is not freed up, the qcow image remains the same size. However, if I create a new snapshot again, it will take the previous snapshot's space. This does not seem to be very well documented in qemu and the man page, manual, online documentation, wiki etc does not mention it. Is there a way to free up the space allocated for snapshots? Thank you, Laszlo -- EOF

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[libvirt-users] all.accept_redirects force disabled with libvirt
by Thomas Lau 09 Dec '14

09 Dec '14

Hi All, I was having trouble to enable all.accept_redirects due to our network structure, we have to enable it, but all libvirt installed machines contain this setting: net.ipv4.conf.all.accept_redirects = 0 I even use sysctl.conf to force to enable it, still no go, anyone know why? -- Thomas Lau Director of Infrastructure Tetrion Capital Limited Direct: +852-3976-8903 Mobile: +852-9323-9670 Address: 20/F, IFC 1, Central district, Hong Kong

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[libvirt-users] libgfapi disk locking in virtlockd not working
by Piotr Rybicki 08 Dec '14

08 Dec '14

Hello. I'm playing with libgfapi network disks, over IB and all is working fine, but not disk locking (and true rdma transport). I use virtlockd, and with fuse mount, locking works as expected. But when i converted disk definitions to libgfapi, locks are not created (but qemu starts and works fine). I used direct and indirect locking - same result : qemu working fine, no locks. my revelant xml section: <disk type='network' device='disk'> <driver name='qemu' type='raw' cache='writethrough' iothread='1'/> <source protocol='gluster' name='pool_test/gentoo-virtio-lib1-sys.img'> <host name='X.X.X.X' port='24007' transport='rdma'/> </source> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> I also tried devices <lease> but it also doesn't work: <lease> <lockspace>somearea</lockspace> <key>somekey</key> <target path='/data/nfs/lockd'/> </lease> # virsh start gentoo-virtio-lib1 błąd: Uruchomienie domeny gentoo-virtio-lib1 nie powiodło się błąd: internal error: Lockspace for path /data/nfs/lockd/somearea does not exist well, lockspace exists... # ls -al /data/nfs/lockd razem 4K drwxrwxrwx 3 root root 21 12-08 22:43 . drwxrwxrwt 7 root root 4096 12-08 14:29 .. drwxrwxrwx 2 qemu qemu 6 12-08 22:43 somearea # ls -al /data/nfs/lockd/somearea/ razem 0K drwxrwxrwx 2 qemu qemu 6 12-08 22:43 . drwxrwxrwx 3 root root 21 12-08 22:43 .. Are libgfapi based disks supported by virtlockd? Is there a bug. Am I missing something? My test system: # uname -r 3.14.24-gentoo # libvirtd -V libvirtd (libvirt) 1.2.10 # virtlockd -V virtlockd (libvirt) 1.2.10 # qemu-x86_64 -version qemu-x86_64 version 2.1.2, Copyright (c) 2003-2008 Fabrice Bellard # glusterfs -V glusterfs 3.5.20141204.7b160e3 built on Dec 8 2014 19:03:37 (normally 3.5.2, but was curious if 3.5 series nightly buld will enable true RDMA transfer, not IPOIB. - it did not). Best regards Piotr Rybicki

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[libvirt-users] command reference
by Laszlo Hornyak 08 Dec '14

08 Dec '14

Hi, I have found the online command reference somewhat incomplete so I thought I give it a try and fill in some of the gaps, but when I cloned the repo I noticed that the last commit happened a little more than 3 years ago. Do you guys accept patches for the documentation? What is the plan in general for the future on the documentation front lines? -- EOF

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[libvirt-users] best shared storage solution ?
by Jason Vas Dias 08 Dec '14

08 Dec '14

Good day - Is there a way of safely allowing a guest OS to access a disk storage device that is also mounted at the same time by the hypervisor or another guest ? I have Linux LVM volumes containing ext4 and btrfs filestystems that need to be shared between the hypervisor and the guests, and between guests . Attempts to use NFS are too slow to be useable - it takes a guest around 4 hours to uncompress and extract a 10MB tar file (using 4 2.9GHz cores). I need access to the shared file system at all times to use as my /home directory from the hypervisor host, so I guess this rules out iSCSI . I came accross documentation on 'sanlock', but its purpose seems to be antithetical to what I require, as described at: http://libvirt.org/locking.html : " how to ensure a single disk cannot be used by more than one running VM at a time, across any host in a network" - but I want to ensure SAFE concurrent access by multiple VMs or any kernel , either on the hypervisor hardware or in a VM guest, to the same filesystems ( ext4, btrfs ) on the same machine, without having to use a network file system . Can sanlock be used to accomplish this ? Or is there any other method that allows the same filesystem to be safely accessed by more than one kernel running on the same host ? The libvirt documentation is very sketchy on this subject, but I understand that just using the '<shareable/>' in the VM configuration XML is not enough, and a lock manager must be configured - can sanlock be used for this, or is there another lock manager that can ? Thanks & Regards, Jason Vas Dias

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[libvirt-users] Libvirt Live Migration
by Dhia Abbassi 04 Dec '14

04 Dec '14

I'm trying to implement a virtualization API. I was testing migration with libvirt I got some problems. When I use the following command : *virsh migrate --live --persistent --copy-storage-all vm-clone1 qemu+ssh://server_ip/system* the migration works fine but in the destination host the migrated vm is paused and I can't unpause it and I need to reboot the vm to be able use it in the new host. When I try to unoause it Igot the following error message: << *Error unpausing domain: internal error: unable to execute QEMU command 'cont': Resetting the Virtual Machine is required *>> How can I solve this problem, or is there an other way to make a live migration with libvirt?? Thank you for you consideration. -- Best regards *Dhia Abbassi* Full Stack Engineer | Rosafi Holding <http://tn.linkedin.com/in/dhiaabbassi> <https://github.com/DhiaTN> <https://plus.google.com/u/0/+DhiaAbbassi> <https://twitter.com/DhiaTN>

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[libvirt-users] Problem with /dev/tty in LXC established with virt-install
by Vegard Vesterheim 04 Dec '14

04 Dec '14

I have created a LXC container with debootstrap followed by virt-install like this: host=mylxc1 debootstrap wheezy /home/lxc/$host virt-install -c lxc:// -n $host --filesystem /home/lxc/$host,/ --ram 1024 I am confused about the /dev filesystem in this container. Specifically the device '/dev/tty'. >From inside the container: ~# ls -la /dev/tty ls: cannot access /dev/tty: No such file or directory # mknod -m 666 /dev/tty c 4 0 mknod: `/dev/tty': Operation not permitted A LXC container created and started with the native LXC commands (lxc-create/lxc-start) has a functioning /dev/tty: # cat </dev/tty foo foo ^C How can I create a functioning /dev/tty with the LXC driver in libvirt? - Vegard V -

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[libvirt-users] Libvirt building fails after download from git
by Pavel Khrulev 03 Dec '14

03 Dec '14

Hello. I need to build libvirt-1.2.10 (with mingw fix) in mingw in windows. I did autogen in linux mint 16, then transferred all files from libvirt directory (sources, configure, makefile.in, ... ) to windows xp. Libvirt is successfully builded in mingw in winxp. Ok. I uploaded all libvirt files (that were successfully builded) to git repository from linux. Then I cloning git rep to windows. And when I do configure, then config.h is not the same with config.h, which is created earlier (before git). And due to this config.h, building libvirt is failed. All files (before upload and arter download ) are the same (checked by KDiff). Do you know, what a problem? May be the problem is in timestamps. (But I tried to touch all files) Or some reconfigure after git. I really dont know. Pavel Khrulev

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[libvirt-users] serial connection between two guests
by Jd 01 Dec '14

01 Dec '14

Hi Is it possible to drive a serial connection between two guests ? For example, the virt-io serial channel used by guestfsd. Can it be driven by virt-io serial connection from another VM ? How do you attach the same device on host as server in one VM and client as another ? Any details on how to go about doing this ? Thanks /Jd

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