- Users - libvirt List Archives

[libvirt-users] Hypervisor loses network connectivity
by Phill Edwards 04 Jan '16

04 Jan '16

I have been running KVM on a CentOS 7.1 host for a few months. I have one "main" host server plus a "backup" host server. Some time ago everything was running fine on "main", but all of a sudden the server became non-contactable on it's network interface. I could no longer SSH in and therefore couldn't run virt-manager. I don't know what caused this and I had to bring all the VMs up on "backup" and they've been running OK there ever since. Over the last few days I've rebuilt "main" and again all was going well and I migrated 4 of the 5 VMs back onto it. Then this morning I came to set up the final VM on "main" which is a Sophos firewall machine with 3 NICs (I have 3 physical NICs). Nothing uses 2 of the 3 NICs except the Sophos VM. I unplugged one of the ethernet cables from "backup" and plugged it into the 3rd NIC on "main" and all of a sudden "main" froze and again all network connectivity was lost. I rebooted it but the problem still remains that it's not contactable over the network and is therefore totally non-functional. When I log in at the console and run "ip a" I can see various network interfaces including br0 with the expected IP address - so it looks like it's got network connectivity but it hasn't. Has anyone else experienced this and know why it happens and how to fix it? I don't think I fancy rebuilding everything a 3rd time as it seems likely to happen again. Depending on why it's happening I'm thinking of moving off CentOS onto Ubuntu as the host OS, or moving away from KVM altogether. Thanks in advance for any help you can give.

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[libvirt-users] External snapshot warning.
by Dominique Ramaekers 03 Jan '16

03 Jan '16

Hi, If I make an external snapshot using the method of active block commit, I get these messages after the block commit: $virsh snapshot-create-as CmsrvAPP2 --name onderhoudscript --disk-only --atomic --quiesce --no-metadata Domein snapshot onderhoudscript is aangemaakt $virsh blockcommit CmsrvAPP2 vda --verbose --pivot 2016-01-03 18:14:52.784+0000: 15861: info : libvirt version: 1.2.16, package: 1.2.16-2ubuntu11.15.10.1 2016-01-03 18:14:52.784+0000: 15861: warning : virEventPollUpdateTimeout:268 : Ignoring invalid update timer -1 Successfully pivoted I've googled the 'invalid update timer -1' warning and found some messages about losing disk data after snapshot commits (using an other methode of snapshotting). I've done some tests with snapshotting, creating a file in the guest, doing the blockcommit. And I don't notice something weird. The only weird thing is: it only happens with one of the ten guests that run on the host... Should I worry about this? Greetings and thanks in advance, Dominique.

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[libvirt-users] QXL-driver for Windows 10
by Dominique Ramaekers 24 Dec '15

24 Dec '15

Hi, I can't seem to find a QXL-driver for Windows 10. The qxl-0.1-21 won't install due to being incompatible to Windows 10. Am I missing something? Thanks in advance, Dominique.

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[libvirt-users] double nat - common setup
by lejeczek 22 Dec '15

22 Dec '15

hi everybody my mind must have gone blank & eyes blind, I'm hoping it's simple and somebody can shed the light on bit I cannot see. a regular default net: <network> <name>default</name> <uuid>4c0a0c44-7e8a-493b-a57c-87cd38eaa0f7</uuid> <forward mode='nat'/> <bridge name='virbr0' stp='on' delay='0'/> ... a winbox on that net and I cannot access it from/via Internet, port forwarding fixed on the default gw/internet interface (or rather firewalld's zone), it forwards to winbox. what is it?

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[libvirt-users] Setting environment variables for LXC Containers
by Harish Vishwanath 22 Dec '15

22 Dec '15

Hello Is there a way to set custom environment variables for LXC containers so that it is available for all processes within the container? The libvirt-lxc driver seems to be setting up only the below variables (as per the docs), but there doesn't seem to be a way customize it. containerThe fixed string libvirt-lxc to identify libvirt as the creator container_uuidThe UUID assigned to the container by libvirtPATHThe fixed string /bin:/usr/binTERMThe fixed string linuxHOMEThe fixed string / In addition to the standard variables, the following libvirt specific environment variables are also provided LIBVIRT_LXC_NAMEThe name assigned to the container by libvirt LIBVIRT_LXC_UUIDThe UUID assigned to the container by libvirt LIBVIRT_LXC_CMDLINEThe unparsed command line arguments specified in the container configuration. Use of this is discouraged, in favour of passing arguments directly to the container init process via the initarg config element. I am looking for something similar to this: https://linuxcontainers.org/lxc/manpages/man5/lxc.container.conf.5.html (lxc.environment) Regards, Harish

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[libvirt-users] centos6.5 libvirt 1.2.14 virsh hang
by 王李明 21 Dec '15

21 Dec '15

hi all： my environment is centos6.5 libvirt version is 1.2.14-1 qemu version is 1.7.0-1 I use openstack create a windows guest about two days later I run virsh list but the the process is hang virsh list can not return any thing it hang then I run /etc/init.d/libvirtd restart it show libivrtd stop faild and start failed I run /etc/init.d/libvirtd status it show libvired dead but subsys locked who can help me ? thans

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[libvirt-users] Getting IP address of a lxc container via libvirt
by Harish Vishwanath 18 Dec '15

18 Dec '15

Hello I wanted to understand if there is a way to get LXC container's ip address. - virDomainInterfaceAddresses API only works for qemu/kvm and not with the lxc driver. What other options do I have? Using enter-lxc-namespace is throwing this error: virsh -c lxc:/// lxc-enter-namespace <domain> --noseclabel /sbin/ifconfig libvirt: error : Expected at least one file descriptor Appreciate any help. Regards, Harish

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[libvirt-users] migrate a guest from VMware to KVM
by Andrei Perietanu 17 Dec '15

17 Dec '15

I am trying to migrate a VMware guest to KVM. I have the .vmdk file which I convert to qcow2 format using qemu-img convert. The next step is to import the new img file. If I use virt-install --import <guest config options> it all works fine. But when I try the same think using the libvirt API I get the "no boot disk found" message when starting the vm. When importing the VM through the libvirtAPI, I use the same xml description virsh outputs (dumpxml) after initially doing the import. xml - the description I got using virsh xmldump <domain name> xmlDesx = xml conn.defineXML(xmlDesc) One other important aspect is I am using a directory storage pool to store all my volumes (.img files). When I use virsh to import the vm, the storage pool recognizes the new volume (the .img file I converted from the .vmdk file). But when I use the libvirtAPI, it does not. So my guess is that because the storage pool does not see the new volume when I import the vm is the reason I get the "no boot disk found message". Is there a way to tell the storage pool about the new volume? What exactly does virsh do and I am not ? Thanks, Andrei -- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you receive this in error please contact the sender and delete the material from any computer immediately. It is the policy of Klas Limited to disavow the sending of offensive material and should you consider that the material contained in the message is offensive you should contact the sender immediately and also your I.T. Manager. Klas Telecom Inc., a Virginia Corporation with offices at 1101 30th St. NW, Washington, DC 20007. Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish Limited Liability Company, with its registered office at Fourth Floor, One Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.

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[libvirt-users] Passing a USB hub
by Ruben Torrero Marijnissen 17 Dec '15

17 Dec '15

Hi, I'm trying to assign a complete USB Hub to my Windows 10 guest, using libvirt 1.3. Following the documentation, I tried adding the following to the definition of my guest: ... <devices> .. <hub type='usb'> <address type='usb' bus='1' port='10.2'/> </hub> .. </devices> To get the correct port, I used lsusb: [root@nobill-main 004]# lsusb -t /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 5000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M |__ Port 5: Dev 110, If 0, Class=Hub, Driver=hub/4p, 480M |__ Port 1: Dev 52, If 0, Class=Hub, Driver=hub/4p, 480M |__ Port 1: Dev 53, If 0, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 1: Dev 53, If 1, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 3: Dev 54, If 0, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 3: Dev 54, If 1, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 3: Dev 54, If 2, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 4: Dev 55, If 1, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 10: Dev 117, If 0, Class=Hub, Driver=hub/4p, 480M |__ Port 2: Dev 118, If 0, Class=Hub, Driver=hub/4p, 480M |__ Port 11: Dev 8, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M |__ Port 11: Dev 8, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M (I want to assign port 10 in bus 1, the one that (still) has nothing attached to it. I can save it correctly, but after doing so, the guest wont start, complaining it can't find bus with index 1. After playing with lots of different configurations, my conclusions are: - Any other bus different than 0, will make virt-manager instantly complain that it cant find the bus (weird, since bus 0 doesn't exist according to lsusb) - Some ports allow the guest to start, but I won't be able to see the hub on windows. - Some other ports make virt-manager complain that it can't find anything attached there. Has anyone managed to get this working? Thanks, Rubén

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[libvirt-users] Questions about qcow2 file size management
by Jérôme 17 Dec '15

17 Dec '15

Hi all. I have a few questions regarding the qcow2 format. 1/ Allocated size vs. file size When creating a VM, I indicated a size of 10 G. $ls -lsh 7,7G -rw------- 1 libvirt-qemu libvirt-qemu 11G oct. 14 10:04 prod.qcow2 The allocated size is lesser than max size. Alright. I think I more or less grab the difference between allocated size and file size, but I'm not sure I get the point of the auto-grow feature of qcow2. Can someone confirm that if I have, say, a 60Go partition, I can create more than six 10Go VM, as long as each don't actually use the full 10 Go? Sort of like flying companies selling more tickets than seats in the plane assuming a few people won't come. In other words, can I have this on a 60Go drive? total 53G 7,4G -rw------- 1 root root 11G oct. 8 06:34 prod_151008.qcow2 7,4G -rw------- 1 root root 11G oct. 9 06:37 prod_151009.qcow2 7,5G -rw------- 1 root root 11G oct. 10 06:41 prod_151010.qcow2 7,5G -rw------- 2 root root 11G oct. 11 06:49 prod_151011.qcow2 7,5G -rw------- 1 root root 11G oct. 12 06:44 prod_151012.qcow2 7,5G -rw------- 1 root root 11G oct. 13 06:27 prod_151013.qcow2 7,7G -rw------- 1 root root 11G oct. 14 06:55 prod_151014.qcow2 (Total allocated is 53 < 60 but sum of 11G sizes is 77 G.) If so, then I guess I get the point. 2/ Backup size Is there a simple way to do backups that only take the actual allocated space (7,7 G in my example) instead of the max (10 G)? I'm using snapshots and blockcommits to backup a VM, thanks to help on this list. The scripts are on GitHub for anyone interested [1]. Basically, what the script does is snapshot then cp as local backup file. Then rsync to another backup partition. Both source and destination partitions are ext4. Source dir (where I cp the snapshots): # ls -lsh vmbackup/daily/ total 53G 7,4G -rw------- 1 root root 11G oct. 8 06:34 prod_151008.qcow2 7,4G -rw------- 1 root root 11G oct. 9 06:37 prod_151009.qcow2 7,5G -rw------- 1 root root 11G oct. 10 06:41 prod_151010.qcow2 7,5G -rw------- 2 root root 11G oct. 11 06:49 prod_151011.qcow2 7,5G -rw------- 1 root root 11G oct. 12 06:44 prod_151012.qcow2 7,5G -rw------- 1 root root 11G oct. 13 06:27 prod_151013.qcow2 7,7G -rw------- 1 root root 11G oct. 14 06:55 prod_151014.qcow2 Destination (where rsync copies the files): # ls -lsh /mnt/usb_hd/vm/vmbackup/daily/ total 71G 11G -rw------- 1 root root 11G oct. 8 06:34 prod_151008.qcow2 11G -rw------- 1 root root 11G oct. 9 06:37 prod_151009.qcow2 11G -rw------- 1 root root 11G oct. 10 06:41 prod_151010.qcow2 11G -rw------- 2 root root 11G oct. 11 06:49 prod_151011.qcow2 11G -rw------- 1 root root 11G oct. 12 06:44 prod_151012.qcow2 11G -rw------- 1 root root 11G oct. 13 06:27 prod_151013.qcow2 11G -rw------- 1 root root 11G oct. 14 06:55 prod_151014.qcow2 Allocated size is as big as file size. This kind of beats the point of having qcow2 grow as needed. Ideally, I would like to create VM with a huge max file size, but only backup the actually used space. How may I achieve this? I just tested qemu-img convert -O qcow2 prod_151008.qcow2 prod_151008_resize.qcow2 and I get 7,2G -rw-r--r-- 1 root root 7,2G oct. 14 10:51 prod_151008_resize.qcow2 Seems to work. I could do this before rsyncing. Is this the recommanded way? Is there a higher level libvirt command to use instead of qemu-img? 3/ Playing with allocated space My VM apparently has an allocated size of 7.7 G 7,7G -rw------- 1 libvirt-qemu libvirt-qemu 11G oct. 14 10:04 prod.qcow2 However, loging into it shows much less than 7.7 G is used: $df -h Filesystem Size Used Avail Use% Mounted on /dev/vda1 9.8G 2.0G 7.3G 22% / udev 10M 0 10M 0% /dev tmpfs 2.0G 17M 2.0G 1% /run tmpfs 4.9G 4.0K 4.9G 1% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 4.9G 0 4.9G 0% /sys/fs/cgroup tmpfs 1003M 0 1003M 0% /run/user/1000 I understand once qcow2 has grown to a given allocated size, it won't de-allocate space automatically (auto-allocation is one way only). Perhaps I ended up loading 7Go of files, then those were deleted and now only 2Go are used but the file still has 7G allocated. Could be, but I don't see when this might have happened. Could there be another explanation? Say I want to minimize allocated space because it is a pity to use 2 Go and keep 7 Go backups (I know disk space is cheap, this is just an example), how may I shrink allocated space to currently used space? I'm not talking about shrinking the file, just minimizing the allocated size to keep small backups as per former paragraph, still keeping max file size big to let the VM grow further when needed. In other words, I'm aiming at 2,7G -rw------- 1 libvirt-qemu libvirt-qemu 11G oct. 14 10:04 prod.qcow2 not at 2,7G -rw------- 1 libvirt-qemu libvirt-qemu 2,7G oct. 14 10:04 prod.qcow2 The guest is a Linux, BTW. 4/ Playing with qcow2 file sizes Say I've got this file 7,7G -rw------- 1 libvirt-qemu libvirt-qemu 11G oct. 14 10:04 prod.qcow2 I'd like to make it bigger, like 7,7G -rw------- 1 libvirt-qemu libvirt-qemu 100G oct. 14 10:04 prod.qcow2 AFAIU, the steps would be - power off the VM - expand the qcow2 file size - from the host, extend the volume - power on the VM - from the guest, extend the filesystem I've seen various post on the internet but I'm a bit confused and some posts may be to old to consider new libvirt/qemu possibilities, so I'd appreciate a safe pointer. (I'm also interested in reducing file size.) Thanks for any hint. [1] https://github.com/Jerome-github/vmbackup -- Jérôme

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