- Users - libvirt List Archives

[libvirt-users] How do you force a VM reboot (when its KPd etc) without interrupting a blockcopy?
by Scott Sullivan 16 Jan '15

16 Jan '15

My question is this: If you have an ongoing blockcopy (drive-mirror) of a running transient VM, and the VM kernel panics, can you restart the VM without interrupting the ongoing blockcopy? A virsh reboot won't work since if the VM is kernel panicked, its not going to respond to ACPI requests.

3 3

[libvirt-users] Discard disk changes on shutdown
by Jason Macgowan 16 Jan '15

16 Jan '15

Hi Everyone, I'm trying to start a domain that will discard all changes to its disks on shutdown. I've tried adding <transient/> to the disk declarations in the definition xml but this results in a "not supported" error message on define. Is there a way to do this without creating and rolling back snapshots? Thanks, Jason

2 1

[libvirt-users] create 1000 vNICs and attach to them DOT1X profiles
by Ion Ermurachi 16 Jan '15

16 Jan '15

Hello Folks, I am looking for ideas on how to create 1000 DOT1X sessions generated from a Linux BOX. DOT1X is a name for EAP packets that travel in an Ethernet environment and is used to transport authentication information before a PC will get access to the network, it is based on RFC-3748. Having this in mind a virtual interface will need a MAC address and an eventually IP (I want to stress out that for EAP over LAN, DOT1X, there is need for L2 virtual interface). One DOT1X session can be easily generated using network manager (nmcli) on a physical NIC. For network manager this is a session that may include many parameters used to form the connection, in my case used for DOT1X authentication. I am looking for a solution on how to create 1000 DOT1X sessions/connections using Linux virtual interfaces and one physical NIC. An idea would be to use a virtual bridge and attach to it a physical interface. After that, create virtual interfaces that will be connected to the bridge. In this case the bridge will relay packets between physical and virtual interfaces. Looking on this alias I understood from Michal Privoznik that above is feasible. Questions 1.Is it possible to create virtual interfaces that will be further managed by the NETWORK MANAGER ? 2.What would be the exact steps and commands to generate these interfaces having fresh OS installed ? I have tried creating vNICs using "virsh" using bellow syntax but it will not start it and I am still not sure if in the end can be managed by the NETWORK MANAGER: virsh iface-define XML_LOCATION virsh iface-list ---> this will list interfaces created virsh iface-start INTERFACE_DEFINED_ABOVE Thanks in advance. Best Regards Ion Ermurachi

1 0

[libvirt-users] Resizing lvm fails with fedora20
by Alex Regan 15 Jan '15

15 Jan '15

Hi, I'm trying to resize a 15GB LVM root partition on a fedora20 server with a fedora20 guest and I'm having a problem. Is this supported on fedora20? I recall having a similar problem (maybe even exact same problem) all the way back in fedora16 or fedora17, but hoped/thought it would be fixed by now? # virt-df -h test1-011015.img Filesystem Size Used Available Use% test1-011015.img:/dev/prop/boot 476M 109M 338M 23% test1-011015.img:/dev/prop/root 14G 10G 3.3G 72% # truncate -s 50G newimg # virt-resize test1-011015.img newimg --expand /dev/sda1 --LV-expand /dev/prop/root Examining test1-011015.img ... virt-resize: libguestfs error: lvm_set_filter: vgchange -ay: /run/lvm/lvmetad.socket: connect failed: No such file or directory WARNING: Failed to connect to lvmetad: No such file or directory. Falling back to internal scanning. /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory Couldn't find device with uuid uA2ju5-EElD-xgB3-EE7J-gJ55-UnkY-Vq2l6H. /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory /run/lvm/lvmetad.socket: connect failed: No such file or directory Refusing activation of partial LV home. Use --partial to override. What are my alternatives for resizing a root partition on LVM? Thanks, Alex

2 2

[libvirt-users] domain has active block job
by Fiorenza Meini 14 Jan '15

14 Jan '15

Hi there, I receive this error when I run nova image-create <VM name> <Vm Sanpshot name>: Exception during message handling: block copy still active: domain has active block job In libvirt log file I can see: error : qemuDomainDefineXML:6312 : block copy still active: domain has active block job Libvirt is 1.2.7 version, linux system is Debian Wheezy Please, what does it mean ? Regards Fiorenza -- Spazio Web S.r.l. V. Dante, 10 13900 Biella Tel.: +39 015 2431982 Fax.: +39 015 2522600 Numero d'Iscrizione al Registro Imprese presso CCIAA Biella, Cod.Fisc.e P.Iva: 02414430021 Iscriz. REA: BI - 188936 Cap. Soc.: €. 30.000 i.v.

3 7

[libvirt-users] Block Commit: [100 %]error: failed to pivot job for disk vda
by Thomas Stein 14 Jan '15

14 Jan '15

Hello. I'm seeing this error while doing a backup of a VM. + virsh blockcommit kaltura vda --active --verbose --pivot Block Commit: [100 %]error: failed to pivot job for disk vda error: internal error: unable to execute QEMU command 'block-job-complete': The active block job for device 'drive-virtio-disk0' cannot be completed I'm on qemu 2.2.0 and libvirt-1.2.11. Does someone else see this error? Libvirt.log says: 2015-01-07 11:18:07.000+0000: 19355: warning : qemuDomainObjBeginJobInternal:1381 : Cannot start job (query, none) for domain kaltura; current job is (modify, none) owned by (19357, 0) 2015-01-07 11:18:07.000+0000: 19355: error : qemuDomainObjBeginJobInternal:1386 : Timed out during operation: cannot acquire state change lock 2015-01-07 11:18:35.556+0000: 19357: error : qemuMonitorJSONCheckError:381 : internal error: unable to execute QEMU command 'block-job-complete': The active block job for device 'drive-virtio-disk0' cannot be completed Any ideas? thanks and cheers t.

2 4

[libvirt-users] missing backend for pool type 5 (iscsi)
by Mathieu Bouillaguet 12 Jan '15

12 Jan '15

Hi, I try to define an iscsi pool with virsh but I always get the following error : error :internal error: missing backend for pool type 5 (iscsi) And yet libvirt was compiled with iscsi support : configure: Storage Drivers configure: configure: Dir: yes configure: FS: yes configure: NetFS: yes configure: LVM: yes configure: iSCSI: yes configure: SCSI: yes configure: mpath: yes configure: Disk: yes configure: RBD: no configure: Sheepdog: no configure: Gluster: no configure: ZFS: no And virsh report that iscsi is supported : virsh -V Virsh command line tool of libvirt 1.2.11 See web site at http://libvirt.org/ Compiled with support for: Hyperviseurs : QEMU/KVM LXC UML OpenVZ VMWare VirtualBox ESX Test Réseau : Remote Network Bridging Interface udev Nwfilter VirtualPort Stockage : Dir Disk Filesystem SCSI Multipath iSCSI LVM Divers : Daemon Nodedev Secrets Debug Readline Modular Any idea what's going on ? thanks for your help

2 2

[libvirt-users] Libvirt to return the ip address instead of the hostname during migration
by Yagmur Akbulut 12 Jan '15

12 Jan '15

Hi all, We are working on nova live-migration using Ceph and trying to work around the problem where vm migration fails if name resolution is not enabled in a cluster. See the link, https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/ht… We have managed to work around this by setting the flag to include “VIR_MIGRATE_TUNNELLED”. However, it is noticebaly slower than non tunnelled. We were hoping that setting the listen_addr would get libvirt to return the listen_addr rather than the hostname but virGetHostname in libvirt/src/util/virutil.c doesn’t have access to the config structure. I was wondering if libvirt can be patched in a way to return the ip address of the destination instead of the hostname during migration? Regards, Yagmur Akbulut

2 1

[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

3 7

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

09 Jan '15

On 12/24/14 4:42 AM, Kashyap Chamarthy wrote: > On Tue, Dec 23, 2014 at 12:38:57PM -0600, Gary R Hook wrote: > > [. . .] > > In my case, the block device is a QCOW2 disk image file. If I boot > without using the disk image file which has the operating system, the > domain will fail to boot, no? > > I see you're playing with NBD disks. I'll admit, I haven't played much > with QEMU NBD, will have to experiment post holidays. Back from the holidays, and back on this issue. I've learned a lot. I've learned how to use the blockcopy command to create a local copy in a simple disk file: virsh dumpxml my_domain > my_domain.xml virsh undefine my_domain virsh blockcopy --domain my_domain vda $PWD/dsk.copy.qcow2 --wait --verbose --finish virsh define my_domain.xml and the resulting copy in dsk.copy.qcow2 is, indeed, bootable. It appears to be a perfect copy, as I expect it to be. But while I see (per Kashyap's article, etc) that it can be useful in certain scenarios, it's not interesting to me. I would like to my copy to be off-system, and was hoping to use the NBD interface to accomplish that. So I tried this (a variant of the above), working on the same system because it's easier: qemu-img create -f qcow2 /tmp/dsk.test.qcow2 qemu-nbd -f qcow2 -p11112 /tmp/dsk.test.qcow2 nbd-client localhost 11112 /dev/nbd2 virsh dumpxml my_domain > my_domain.xml virsh undefine my_domain virsh blockcopy --domain my_domain --wait --verbose --finish virsh define my_domain.xml nbd-client -d /dev/nbd2 and the qemu-nbd process exits, as I wish. I presume at this point that the new file has integrity. I can take the qcow2 file that belongs to the domain and serve it up via NBD: qemu-nbd --partition=1 -p11112 /path/to/my/qcow2/file.qcow2 nbd-client localhost 11112 /dev/nbd2 mount /dev/nbd2 -oloop /mnt/foo and lo! in /mnt/foo I found my root filesytem. Seems perfectly reasonable. If, however, I try to use my generated-via-NBD file, I get this: # qemu-nbd --partition=1 -p11112 $PWD/dsk.test.qcow2 & [1] 7672 # qemu-nbd: Could not find partition 1: Invalid argument [1]+ Exit 1 qemu-nbd --partition=1 -p11112 $PWD/dsk.test.qcow2 # qemu-nbd --partition=0 -p11112 $PWD/dsk.test.qcow2 & [1] 7686 # qemu-nbd: Invalid partition 0 ^C [1]+ Exit 1 qemu-nbd --partition=0 -p11112 $PWD/dsk.test.qcow2 # qemu-nbd --partition=2 -p11112 $PWD/dsk.test.qcow2 & [1] 7699 # qemu-nbd: Could not find partition 2: Invalid argument ^C [1]+ Exit 1 qemu-nbd --partition=2 -p11112 $PWD/dsk.test.qcow2 # qemu-nbd --partition=3 -p11112 $PWD/dsk.test.qcow2 & [1] 7830 # qemu-nbd: Could not find partition 3: Invalid argument [1]+ Exit 1 qemu-nbd --partition=3 -p11112 $PWD/dsk.test.qcow2 I don't know what has been created, but it's not a copy of the original guest's disk. There's no partition there, it seems. So yes, blockcopy works fine under certain conditions. But the NBD layer seems to really muck things up. Or, more likely, I'm doing things wrong. I'm hoping someone can point out something obvious. There's a recent thread about "Block Replication for Continuous Checkpointing" that is heading towards using NBD. I fail to understand how this is ever going to work, based on my explorations. -- Gary R Hook Senior Kernel Engineer NIMBOXX, Inc

4 6