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[libvirt-users] creating snapshots for sheepdog with libvirt API
by Pavel Tokarev 24 Sep '13

24 Sep '13

Hello! I am trying to create snapshots for sheepdog disks using libvirt API or virsh. The disk is defined in domain as follows: <disk type='network' device='disk'> <driver name='qemu' cache='none'/> <source protocol='sheepdog' name='sheepvol1'/> <target dev='vdb' bus='virtio'/> </disk> I have tried both options "external" and "internal". If I try to create external snapshot with virsh command: snapshot-create-as vps vpssnap --disk-only --diskspec vda,snapshot=no --diskspec vdb,snapshot=external I get an error: source for disk 'vdb' is not a regular file; refusing to generate external snapshot name. If I try the same command but with "internal" mode: snapshot-create-as vps vpssnap --disk-only --diskspec vda,snapshot=no --diskspec vdb,snapshot=internal virsh creates a snapshot, but this snapshot is useless. If i try to revert to this snapshot i get an error: "qemu-img: Could not open 'sheepvol1': No such file or directory", plus if I list all VDIs with "collie vdi list" I do not see any snapshots there. So i guess virsh does not create an appropriate sheepdog snapshot at all. Can someone please tell me how to create snapshots for sheepdog disks? Thank you.

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[libvirt-users] Using a shared LVM volume group for both virtual disks and host filesystems
by Edoardo Comar 24 Sep '13

24 Sep '13

Hi I have a test environment where a single LVM volume group is used both as a storage pool for virtual machines' disks AND for the LVs used for the HOST system filesystem. I never use libvirt commands to start/stop/activate the pool. Only to create/delete volumes. The test environment works fine. How suitable would be a shared VG for a production environment ? thanks, Edoardo Comar PS - This discussion seems to imply that separate VGs give more safety against data corruption in case of bugs ... did not point to real cases of failure. http://serverfault.com/questions/200728/lvm-volume-group-shared-between-kvm… Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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[libvirt-users] problem with sheepdog backend when creating a pool
by Giovanni Bellac 24 Sep '13

24 Sep '13

Hello all, I am getting a error, when creating a sheepdog pool via libvirt. libvirt is compiled as: ./configure --prefix=/opt/libvirt --without-xen --with-yajl --with-storage-sheepdog=/opt/sheepdog Sheepdog is functional, when creating manually a vdi via "qemu-img" and than using as disk in libvirt. The error looks like this: internal error missing backend for pool type 9 The peace of log: 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollMakePollFDs:391 : Prepare n=2 w=3, f=11 e=1 d=0 2013-09-18 14:51:27.580+0000: 14524: debug : virStoragePoolCreateXML:13588 : conn=0x7f1877937800, xmlDesc= <pool type="sheepdog"> <name>mysheeppool</name> <source> <name>mysheeppool</name> <host name='localhost' port='7000'/> </source> </pool> , flags=0 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollMakePollFDs:391 : Prepare n=3 w=4, f=12 e=1 d=0 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollMakePollFDs:391 : Prepare n=4 w=5, f=6 e=1 d=0 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollMakePollFDs:391 : Prepare n=5 w=6, f=14 e=1 d=0 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollMakePollFDs:391 : Prepare n=6 w=7, f=13 e=0 d=0 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollMakePollFDs:391 : Prepare n=7 w=8, f=13 e=1 d=0 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollMakePollFDs:391 : Prepare n=8 w=10, f=16 e=1 d=0 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollMakePollFDs:391 : Prepare n=9 w=12, f=17 e=1 d=0 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollCalculateTimeout:332 : Calculate expiry of 2 timers 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollCalculateTimeout:340 : Got a timeout scheduled for 1379515892580 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollCalculateTimeout:353 : Schedule timeout then=1379515892580 now=1379515887580 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollCalculateTimeout:361 : Timeout at 1379515892580 due in 5000 ms 2013-09-18 14:51:27.580+0000: 14522: debug : virEventPollRunOnce:627 : EVENT_POLL_RUN: nhandles=9 timeout=5000 2013-09-18 14:51:27.580+0000: 14524: debug : virFileClose:90 : Closed fd 18 2013-09-18 14:51:27.580+0000: 14524: debug : virObjectRef:293 : OBJECT_REF: obj=0x7f1877925550 2013-09-18 14:51:27.580+0000: 14524: debug : virAccessManagerCheckStoragePool:321 : manager=0x7f1877925550(name=stack) driver=QEMU pool=0x7f1864001340 perm=5 2013-09-18 14:51:27.580+0000: 14524: debug : virAccessManagerCheckStoragePool:321 : manager=0x7f1877929180(name=none) driver=QEMU pool=0x7f1864001340 perm=5 2013-09-18 14:51:27.580+0000: 14524: debug : virAccessManagerCheckStoragePool:321 : manager=0x7f1877925550(name=stack) driver=QEMU pool=0x7f1864001340 perm=2 2013-09-18 14:51:27.580+0000: 14524: debug : virAccessManagerCheckStoragePool:321 : manager=0x7f1877929180(name=none) driver=QEMU pool=0x7f1864001340 perm=2 2013-09-18 14:51:27.580+0000: 14524: debug : virObjectUnref:256 : OBJECT_UNREF: obj=0x7f1877925550 2013-09-18 14:51:27.580+0000: 14524: error : virStorageBackendForType:1114 : internal error missing backend for pool type 9 The pool XML: <pool type="sheepdog"> <name>mysheeppool</name> <source> <name>mysheeppool</name> <host name='localhost' port='7000'/> </source> </pool> Kind regards Giovanni

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[libvirt-users] Expanding an LVM Storage Pool
by McEvoy, James 24 Sep '13

24 Sep '13

I looked around but could not find any info on how to expand a libvirt managed LVM storage pool. I do not see any virsh command to do it but I was successful using the vgexpand command to add some more storage once I destroyed the pools and then restarted it. I'd like to verify that this is the proper way to grow the storage in a libvirt LVM storage pool. And this brings up a second question, I did this without any VM running so I'd like to know what the impact of destroying a running pool is on running VMs. Does taking the pool off-line cause any issues with running VMs or is the only affect that the pool is unavailable for management by libvirt? These are the commands that I ran to create my pool and expand it after a kickstart of the server: pvcreate -ff -y /dev/mapper/mpath? virsh pool-define-as --name GuestVols --type logical --source-dev /dev/mapper/mpatha --target /dev/GuestVols virsh pool-build GuestVols virsh pool-start GuestVols virsh pool-autostart GuestVols virsh pool-destroy --pool GuestVols vgextend GuestVols /dev/mapper/mpath{b..d} vgdisplay GuestVols virsh pool-start --pool GuestVols virsh pool-info --pool GuestVols Is this the best way to create a managed pool across 4 LUNs? And to potentially expand the storage group in the future if more storage is needed? --jim

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[libvirt-users] Specify mount option for Storage-Pool
by Jorge Fábregas 24 Sep '13

24 Sep '13

Hi, I've changed the "default" storage-pool from "directory-based" to a "pre-formatted block-device" since my /var/lib/libvirt/images is on a partition of its own. I would like to use the "discard" option as well as other (noatime etc) on this filesystem. Is there a way to specify mount options in the storage-pool XML definition? Thanks, Jorge p.d. the reason for the change is that I don't want the partition to be mounted all the time (just when I start libvirtd).

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[libvirt-users] Libvirt ESX: Image file not getting copied to ESX server
by varun bhatnagar 23 Sep '13

23 Sep '13

Hi, I am trying to start a node using libvirt on ESX hypervisor. Before starting I am performing the following steps: 1) vol-create datastore1 /local/new_volume.xml (Creating a volume in pool) 2) define /local/esxdomain.xml (Defining a node) 3) start MyNode (Starting a node) I tried to get the status of my node and it is showing *running *but I am not able to ping my node (as it is in network). I later got the console of my node and found out that my node is not even getting started. It says "Operating System Not Found". I guess this is because my vmdk image file is not getting copied and the first command is just placing two files .vmdk and *-flat.vmdk (these are dummy files I guess). But it is not placing my original .vmdk files. How to place the original vmdk file in datastore. If I place it using scp command then libvirt pops out a message saying "Could not start domain: GenericVmConfigFault". How to resolve this error. I am pasting my xml files below. Any help is appreciated... :) *new_volume.xml:* *<volume> <name>test/MyNode.vmdk</name> <allocation>0</allocation> <capacity unit='G'>3</capacity> <target> <path>/local/vmdk/MyNode.vmdk</path> <format type='vmdk'/> </target> </volume>* *esxdomain.xml: * *<domain type='vmware'> <name>test</name> <memory>1048576</memory> <currentMemory>1048576</currentMemory> <vcpu>1</vcpu> <console>/dev/console</console> <os> <type arch='x86_64'>hvm</type> </os> <devices> <disk type='file' device='disk'> <source file='[datastore1] test/MyNode.vmdk'/> <target dev='sda' bus='scsi'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <controller type='scsi' index='0' model='lsilogic'/>  <interface type='bridge'> <mac address='00:50:56:0f:01:01'/> <source bridge='VM Network'/> </interface> <interface type='bridge'> <mac address='00:50:56:0f:01:02'/> <source bridge='dummyPortGroup1'/> </interface> <interface type='bridge'> <mac address='00:50:56:0f:01:03'/> <source bridge='dummyPortGroup2'/> </interface> </devices> </domain>* Regards, Varun

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[libvirt-users] Incremental Backups
by Thomas Stein 23 Sep '13

23 Sep '13

Hello. Is someone performing incremental backups via libvirt for qemu/kvm machines? I'm still having a hard time to find a nice procedure. I mean is it possible to make a full backup of an image on monday a do the next days of the week incremental backups? Another way could be mount the image and rsync its contents. Does that makes sense? Also i read in qemu changelog: --- Support for a new block device background job. Started by drive-backup, it will backup a disk's content to a new file. Unlike drive-mirror, the new file will include the source disk's content at the time the backup job was started. Atomic backup of multiple disks is supported using the "transaction" QMP command. --- Is this supported by libvirt? thanks and best regards thomas

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[libvirt-users] Trouble using virStream with callbacks
by Jonathan Lebon 20 Sep '13

20 Sep '13

I am trying to write a simple app which connects a channel obtained from virDomainOpenChannel() to stdin/stdout (based in part on the snippet at [1]). However, it seems like the data received back from the stream is delayed by one iteration. It would be hard to explain this by simply showing the output, so here's a timeline instead: 1. start the program on the host 2. write "msg from host<Enter>" 3. socat on the guest sees this right away 4. from the guest's socat, write "msg from guest<Enter>" 5. the reply does not show up on the host until AFTER you press <Enter> (which of course also sends a newline to the guest) 6. this 'one line delay' occurs throughout the conversation, receiving guest replies to things sent two <Enter>s ago Doing socat on both sides work as expected. Also, using a blocked stream and a thread for sending and another for receiving works as well. It would be nice however if I could get rid of the threads in favour of callbacks. Not sure if I'm missing something obvious. Thanks, Jonathan [1] https://www.redhat.com/archives/libvir-list/2012-December/msg01084.html --- #include <ctype.h> #include <err.h> #include <errno.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <libvirt/libvirt.h> #include <fcntl.h> #define CONNECT_URI "qemu:///system" #define DOMAIN "TestVM" #define CHANNEL "channel.0" #define BUF_SIZE 80 int stream_active = 1; void stdin_to_stream(int watch, int fd, int events, void *opaque) { virStreamPtr stream = *((virStreamPtr*)(opaque)); if (events & VIR_EVENT_HANDLE_READABLE) { char buf[1024]; int bytes_read = read(fd, buf, sizeof(buf)); if (bytes_read > 0) virStreamSend(stream, buf, bytes_read); } if (events & (VIR_EVENT_HANDLE_ERROR|VIR_EVENT_HANDLE_HANGUP)) { stream_active = 0; } return; } void stream_to_stdout(virStreamPtr stream, int events, void *opaque) { if (events & VIR_EVENT_HANDLE_READABLE) { char buf[1024]; int bytes_read = virStreamRecv(stream, buf, sizeof(buf)); if (bytes_read > 0) { fwrite(buf, bytes_read, 1, stdout); fflush(stdout); } } if (events & (VIR_EVENT_HANDLE_ERROR|VIR_EVENT_HANDLE_HANGUP)) { stream_active = 0; } return; } int main(int argc, char *argv[]) { virConnectPtr conn; virDomainPtr dom; virStreamPtr st; int bytes_read; char buf[BUF_SIZE]; if ((conn = virConnectOpen(CONNECT_URI)) == NULL) errx(1, "virConnectOpen"); if ((dom = virDomainLookupByName(conn, DOMAIN)) == NULL) errx(1, "virDomainLookupByName"); if ((st = virStreamNew(conn, VIR_STREAM_NONBLOCK)) == NULL) errx(1, "virStreamNew"); if (virDomainOpenChannel(dom, CHANNEL, st, 0) == -1) errx(1, "virDomainOpenChannel"); if (virEventRegisterDefaultImpl() != 0) errx(1, "virEventRegisterDefaultImpl"); if (virStreamEventAddCallback(st, 1|4|8, stream_to_stdout, NULL, NULL) != 0) errx(1, "virStreamEventAddCallback"); int flags = fcntl(fileno(stdin), F_GETFL) | O_NONBLOCK; fcntl(fileno(stdin), F_SETFL, flags); if (virEventAddHandle(fileno(stdin), 1|4|8, stdin_to_stream, &st, NULL) < 0) errx(1, "virEventAddHandle"); while (stream_active) { if (virEventRunDefaultImpl() != 0) { errx(1, "virEventRunDefaultImpl"); break; } } if (virStreamFinish(st) < 0) errx(1, "virStreamFinish"); if (virStreamFree(st) < 0) errx(1, "virStreamFree"); return 0; }

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[libvirt-users] Libvirt not able to attach console to VM on ESX hypervisor
by varun bhatnagar 19 Sep '13

19 Sep '13

Hi, I have started a virtual machine on my ESXi server. I was trying to attach a console to it but when I executed the command I got a message saying that *"Attaching a console is not supported in the current hypervisor." *Is there any way (patch or something) through which I can attach a console to my VM. The ESX version is 5.1 and I am using latest version of libvirt. Regards, Varun

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[libvirt-users] Specifying a USB Device to use USB2 Controller
by Cameron Curle 18 Sep '13

18 Sep '13

Hi all, Can anyone please advise the correct process for defining a USB device to point to a USB 2 Controller? Specifically, how do you define a USB device to use the EHCI controller in a guest xml file? To summarize my problem: I have 1 x USB1 device and 1 x USB2 device that I would like to use from within a Windows XP Guest. If I add the USB2 device (Avid M-box) to the guest machine via Virt-Manager it will not detect in the guest, when I check the libvirt logs for the VM it shows a "Device speed mismatch" error. Which leads me to think that its attaching itself to the default UHCI controller, as the USB1 device functions correctly. I've followed a similar post on the list here which seems to detail what I am trying to achieve: https://www.redhat.com/archives/libvirt-users/2012-June/msg00139.html I have tried using the controller type and model as below, however, when I try and define the "port" option, it disappears from the configuration file and won't attach to the EHCI controller. <controller type='usb' index='0' model='ich9-ehci' / I've done some searching but can't find any information on how to specifically assign a USB device to a certain controller. Any information or guides you could provide would be much appreciated. I'm using RHEL 6.4 with latest updates available. qemu-kvm-0.12.1.2-2.355.el6.4.7 libvirt-0.10.2-18.el6 4.9 I'm currently defining the USB2 device like this: <hostdev mode='subsystem' type='usb' managed='yes' <source> <vendor id='0x0763' /> <product id='0x202a' /> <address bus='1' device='3' /> </source> </hostdev> Thank you in advance for your assistance. Kind Regards, Cameron

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