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[libvirt-users] Python API does not return all information available
by David Ashley 15 Aug '16

15 Aug '16

All - The Python virDomain method info() does not return all the entries contained in the C struct virNodeInfo. While this is somewhat documented the entries that are returned are unlabeled and the documentation does not specify which VirNodeInfo entries they correspond to. Does anyone have more information they can pass on? Thanks, Davis Ashley

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[libvirt-users] Definition /dev/shm prevent LXC container from start: "Failed to access '(null)': Bad address"
by mxs kolo 15 Aug '16

15 Aug '16

Hi all We use libvirt 1.2.x and 1.3.x with next filesystem definition in config: <filesystem type='ram' accessmode='passthrough'> <source usage='524288' units='KiB'/> <target dir='/dev/shm'/> </filesystem> But libvirt 2.1.0 with same config report error: Failed to access '(null)': Bad address Debug level 1 show: 2016-08-11 10:14:56.661+0000: 1: debug : lxcContainerMountAllFS:1618 : Mounting all non-root filesystems 2016-08-11 10:14:56.661+0000: 1: debug : lxcContainerMountAllFS:1625 : Mounting '(null)' -> '/dev/shm' 2016-08-11 10:14:56.661+0000: 1: error : lxcContainerResolveSymlinks:629 : Failed to access '(null)': Bad address 2016-08-11 10:14:56.661+0000: 1: debug : virFileClose:102 : Closed fd 15 2016-08-11 10:14:56.661+0000: 1: debug : virFileClose:102 : Closed fd 10 2016-08-11 10:14:56.661+0000: 1: debug : virFileClose:102 : Closed fd 12 2016-08-11 10:14:56.661+0000: 1: debug : lxcContainerChild:2271 : Tearing down container Failure in libvirt_lxc startup: Failed to access '(null)': Bad address Someone use libvirt 2.x with /dev/shm device ? Probably need change config and add some definitions to /dev/shm ? b.r. Maxim Kozin

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[libvirt-users] Guest Agent and API Relationship
by David Ashley 13 Aug '16

13 Aug '16

All - I have looked everywhere I can think of (except the C code) to see if I can find the relationship of an API to the guest agent. What I want to know is whether or not a given API has a dependency on the guest agent being available. I know that some of the APIs now have such a dependency but there does not seem to be an indicator in the documentation for when this is the case. Nor is there any comprehensive list of APIs that have a dependency on the guest agent. Any help would be useful. Thanks, W. David Ashley

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[libvirt-users] Attaching disks with external snapshots
by Erlon Cruz 12 Aug '16

12 Aug '16

Hi folks, I'm trying to to attach a disk to an instance using libvirt. The problem is, this disk has external snapshots. The process tried was: 1 - Attach a disk in the domain: * virsh# attach-device instance-00000006 /tmp/disk.xml[1] --live* 2 - Snapshot the disk[2]: * virsh# snapshot-create instance-00000006 --quiesce --xmlfile /tmp/snap-from-disk.xml[2] --disk-only* 3 - Dump the domain XML and create a new disk file from it: *virsh# dumpxml instance-00000006* * ... [3]* 4 - Dettach the device and re-add it using the new disk file: * virsh# detach-device instance-00000006 /tmp/disk-with-snap.xml[4]* * Device detached successfully* * virsh# attach-device instance-00000006 /tmp/disk-with-snap.xml * * error: Failed to attach device from /tmp/disk-with-snap.xml* * error: internal error: unable to execute QEMU command 'device_add': Property 'virtio-blk-device.drive' can't find value 'drive-virtio-disk1'* Question, is this operation supported? If yes, how is the correct procedure? Erlon [1] http://paste.openstack.org/show/556055/ [2] http://paste.openstack.org/show/556056/ [3] http://paste.openstack.org/show/556063/ [4] http://paste.openstack.org/show/556064/

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[libvirt-users] QEMU IMG vs Libvirt block commit
by Erlon Cruz 12 Aug '16

12 Aug '16

Hi folks, I'm having a issue in the standard NFS driver on OpenStack, that uses qemu-img and libvirt to create snapshots of volumes. It uses qemu-img in the Controller to manage the snapshots when the volume is not attached (offline) or calls the Compute (which calls libvirt) to manage snapshots if the volume is attached (online). When I try to create/delete snapshots from a snapshot chain. There are 3 situations: 1 - I create/delete the snapshots in Cinder (it uses qemu-img). It goes OK! I can delete and I can create snapshots. 2 - I create/delete the snapshots, in online mode (it uses libvirt). It goes Ok, as weel. 3 - I create the snapshots in Cinder (offline) and delete then in online mode (using libvirt), then it fails with this message[1]: libvirtError: invalid argument: could not find image 'volume-13cb83a2-880f-40e8-b60e-7e805eed76f9.d024731c-bdc3-4943-91c0-215a93ee2cf4' in chain for '/opt/stack/data/nova/mnt/a3b4c6ddd9bf82edd4f726872be58d05/volume-13cb83a2-880f-40e8-b60e-7e805eed76f9' But, in this folder, there the backing files are there[2] and they are chained as think it suppose to be[3]. The version for the 2 hosts in tests are: Controller/Cinder node: qemu-img version 2.0.0 && libvirt 1.2.2-0ubuntu13 Compute node: qemu-img version 2.5.0 && libvirt-1.3.1-1ubuntu10 Is there any compatibility problem between libvirt and qemu-img snapshots? Have you guys found any problem like that? Erlon ---------------------------------- [1] http://paste.openstack.org/show/543270/ [2] http://paste.openstack.org/show/543273/ [3] http://paste.openstack.org/show/543274/

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[libvirt-users] Go bindings to LibVirt
by Sergey Bronnikov 11 Aug '16

11 Aug '16

Hi, everyone for a small project I need a Go bindings to LibVirt library. There is a page on the official site with a list of bindings to different languages [1], but it is lack of Go bindings. Does it mean there are no official bindings for that language? [1] https://libvirt.org/bindings.html Sergey

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[libvirt-users] Sharing a host directory with a Windows guest
by Peter Steele 11 Aug '16

11 Aug '16

I'm running libvirt un a CentOS 7.2 host and have created a Windows 10 VM under that. I've been researching how to share a folder on my host with the Windows guest VM but can't figure out if it's possible. I've added the code <filesystem type='mount' accessmode='passthrough'> <driver type='path' wrpolicy='immediate'/> <source dir='var/lib/mydata`'/> <target dir='/mydata'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> </filesystem> to the xml definition of my Windows VM but I assume something needs to be configured on the VM side as well. Is there a way to accomplish this? Peter

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[libvirt-users] Proper XML for compareCPU method
by David Ashley 10 Aug '16

10 Aug '16

All - What is the proper XML to supply to the Python Connections compareCPU method? I have looked at the cpu_map.xml file and I believe I have the proper XML configured but the method always throws an exception with a missing CPU architecture error. Here is the code. from __future__ import print_function import sys import libvirt conn = libvirt.open('qemu:///system') if conn == None: print('Failed to open connection to qemu:///system', file=sys.stderr) exit(1) retc = conn.compareCPU('<cpu><arch name="x86"><model name="kvm64"/></arch></cpu>') if retc == -1: print("CPUs are not the same.") else: print("CPUs are the same.") conn.close() exit(0) This probably just a simple error on my part but I have tried more that a few permutations of the XML with no success. So I guess I need some help with this. Thanks, David Ashley

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[libvirt-users] Cannot guestmount a Fedora 24 XFS disk.
by Andre Goree 09 Aug '16

09 Aug '16

I seem to be having trouble using guestmount to mount a Fedora 24 disk that is using XFS. This is the error messings I get when I try: root@cpdev-cn5:/var/lib/libvirt/images/base# guestmount --rw -a ${disk_path}/${disk_name} -m /dev/${target}1 /tmp/fedora-master/ libguestfs: error: mount_options: /dev/vda1 on /: mount: wrong fs type, bad option, bad superblock on /dev/vda1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so guestmount: '/dev/sda1' could not be mounted. Did you mean one of these? /dev/sda1 (xfs) Verbose output shows: libguestfs: recv_from_daemon: received GUESTFS_LAUNCH_FLAG libguestfs: [03647ms] appliance is up libguestfs: send_to_daemon: 72 bytes: 00 00 00 44 | 20 00 f5 f5 | 00 00 00 04 | 00 00 00 4a | 00 00 00 00 | ... guestfsd: main_loop: new request, len 0x44 /dev/sda1: No such file or directory mount -o /dev/vda1 /sysroot/ [ 1.759120] SGI XFS with ACLs, security attributes, realtime, large block/inode numbers, no debug enabled [ 1.762869] XFS (vda1): Version 5 superblock detected. This kernel has EXPERIMENTAL support enabled! [ 1.762869] Use of these features in this kernel is at your own risk! [ 1.764819] XFS (vda1): Superblock has unknown read-only compatible features (0x1) enabled. [ 1.765834] XFS (vda1): Attempted to mount read-only compatible filesystem read-write. [ 1.765834] Filesystem can only be safely mounted read only. [ 1.767472] XFS (vda1): SB validate failed with error 22. mount: wrong fs type, bad option, bad superblock on /dev/vda1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so guestfsd: error: /dev/vda1 on /: mount: wrong fs type, bad option, bad superblock on /dev/vda1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so guestfsd: main_loop: proc 74 (mount_options) took 0.09 seconds libguestfs: recv_from_daemon: 272 bytes: 20 00 f5 f5 | 00 00 00 04 | 00 00 00 4a | 00 00 00 01 | 00 12 34 00 | ... libguestfs: error: mount_options: /dev/vda1 on /: mount: wrong fs type, bad option, bad superblock on /dev/vda1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so I've tried with both /dev/sda1 and /dev/vda1 but no luck. Interestingly enough, a CentOS 7.2 image with XFS and the same setup (i.e., a single partition formatted with XFS) mounts without issue. Any ideas? Andre Goree Senior Engineer, Atlantic.Net CONFIDENTIALITY: This email (including any attachments) may contain confidential, proprietary and privileged information. Any unauthorized disclosure or use without Atlantic.Net's express written consent is strictly prohibited. If you received this email in error, please notify the sender and delete this email from your system.

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[libvirt-users] Mounting VM filesystem on host while VM running
by Patrick PICHON 08 Aug '16

08 Aug '16

Hello, All my VMs are using LVs created on the host side. I'm using collectd to monitor some of the ressources of my host as well as the libvirt pluging to monitor my VMs. Collectd has an interesting plugin ( df ) which can monitor the filesystem usage. I would like to use it to monitor the VMs filesytsem usage. As it is obvious that if I mount the VM filesystem on the host while the VM is running, I'm wondering if I could mount it in READONLY without expecting any panic/corruption problem. Any advices ? Patrick

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