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[libvirt-users] virsh blockcopy without undefine
by Nathan Shearer 14 Oct '15

14 Oct '15

I have a script that performs a backup with the following steps: virsh dumpxml --inactive "$DOMAIN" > "$TMP/${DOMAIN}.xml" && \ virsh dumpxml --inactive "$DOMAIN" > "$DESTINATION_XML" && \ virsh undefine "$DOMAIN" && \ virsh blockcopy "$DOMAIN" "$SOURCE_DISK" "$DESTINATION_DISK" --wait --verbose --finish && \ virsh define "$TMP/${DOMAIN}.xml" It's basic and did work for creating basic backups. Is there a way to do this without undefining the domain? I recently had to redefine the VM from a backup XML because this script failed during the block copy step. Why can't I blockcopy a domain that is defined? Why does it need to be undefined first?

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[libvirt-users] virsh can't support VM offline blockcommit
by 陈明 13 Oct '15

13 Oct '15

Hi everyone! I use the libvirt(version: 1.2.2) and QEMU(version: 2.2.1) to test qemu snapshot features: I tried virsh blockcommit when VM offline, the virsh blockcommit failed: the error messase as below: * error: Requested operation is not valid: domain is not running* when I start the VM, the virsh blockcommit work fine! my question is : we need virsh support blockcommit when VM offline。how do？ we test qemu snapshot as follows： we need create snapshot of the cycle，and by virsh blockcommit merge snapshot chain，but whenVM offline， the virsh blockcommit will fail， someone suggest me：when VM offline，may use qemu-img commit to submit snapshot turn，but qemu-img can't modify snapshot chain backing relation，it need we use qemu-img rebase amend snapshot‘s backingfile，* the main question* is when we use qemu-img rebase modify snapshot's backingfile, if someone start the VM, it will may lead to VM filesystem readonly。 we should how to solve the question? thanks!

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[libvirt-users] Creating external snapshots.
by Dominique Ramaekers 12 Oct '15

12 Oct '15

Hi, I'm trying to create an external snapshot for backup purposes. Only I get an error after the command: virsh snapshot-create-as --domain PCVIRT1 PCVIRT1-SN1 --diskspec vda,file=/var/lib/libvirt/images/VIRT1-SN1.qcow2 --disk-only --atomic --quiesce fout: internal error: kan AppArmor profiel 'libvirt-2c9c04d7-f86d-df12-da9f-9847ac8b994f' niet vernieuwen (Sorry about the dutch... it means: error: internal error: can not renew AppArmor profile 'libvirt-....') I can't find anything about this error... Anybody got an idea how to resolve this problem? Greetings, Dominique.

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[libvirt-users] virsh can't support VM offline blockcommit
by 陈明 12 Oct '15

12 Oct '15

Hi everyone! I use the libvirt(version: 1.2.2) and QEMU(version: 2.2.1) to test qemu snapshot features: I tried virsh blockcommit when VM offline, the virsh blockcommit failed: the error messase as below: * error: Requested operation is not valid: domain is not running* when I start the VM, the virsh blockcommit work fine! my question is : we need virsh support blockcommit when VM offline。how do？ we test qemu snapshot as follows： we need create snapshot of the cycle，and by virsh blockcommit merge snapshot chain，but whenVM offline， the virsh blockcommit will fail， someone suggest me：when VM offline，may use qemu-img commit to submit snapshot turn，but qemu-img can't modify snapshot chain backing relation，it need we use qemu-img rebase amend snapshot‘s backingfile，* the main question* is when we use qemu-img rebase modify snapshot's backingfile, if someone start the VM, it will may lead to VM filesystem readonly。 we should how to solve the question? thanks!

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[libvirt-users] OPW 2015 application
by Ishani 12 Oct '15

12 Oct '15

Sir, I am Ishani Chugh, a third year undergraduate student of Electronics and Communications Engineering at International Institute of Information Technology, Hyderabad. I am passionate about Open Source Development. I also have some experience working with git, I aspire to contribute to QEMU as Open source Developer under OPW and I am interested in working on the project 'Enhancing libvirt-designer', since I feel, I have the enthusiasm and skills required. I will appreciate any assistance with regards to beginner contribution on this project. Sincerely, Ishani

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[libvirt-users] virsh can't support VM offline blockcommit
by justlibvirt 11 Oct '15

11 Oct '15

Hi everyone! I use the libvirt(version: 1.2.2) and QEMU(version: 2.2.1) to test qemu snapshot features: I tried virsh blockcommit when VM offline, the virsh blockcommit failed: the error messase as below: error: Requested operation is not valid: domain is not running when I start the VM, the virsh blockcommit work fine! my question is : we need virsh support blockcommit when VM offline。how do？ we test qemu snapshot as follows： we need create snapshot of the cycle，and by virsh blockcommit merge snapshot chain，but whenVM offline， the virsh blockcommit will fail， someone suggest me：when VM offline，may use qemu-img commit to submit snapshot turn，but qemu-img can't modify snapshot chain backing relation，it need we use qemu-img rebase amend snapshot‘s backingfile， the main question is when we use qemu-img rebase modify snapshot's backingfile, if someone start the VM, it will may lead to VM filesystem readonly。 we shoule solve the question? thanks!

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[libvirt-users] qemu:///session and network-mounted home directories
by Spencer Baugh 11 Oct '15

11 Oct '15

Dear libvirt-users, Suppose my home directory is network mounted on to several different machines. And suppose I defined some VMs in qemu:///session. The configuration files and disk images for qemu:///session are stored in my home directory. Now suppose I log in to some machine and use virsh. The qemu:///session VMs that are marked autostart are started. Now if I log into another machine and use virsh, it will presumably try to start my autostart VMs again, since the same configuration is present in both homedirs. Is there anything libvirt does that might prevent it from starting the same VM multiple times on different machines? Or might allow machine-specific autostart configuration? Maybe something could be done with /etc/machine-id! In terms of qemu:///system, this is like having /var/lib/libvirt/images/ live on a network-mounted filesystem (fairly normal I assume) and also having /etc/libvirt/qemu live on a network-mounted filesystem (not as normal). Not sure how you would deal with the issue there either but I can see why you might want to have your same VM configuration available on all hosts, so it would be cool to figure out that problem as well. The answer may be the VM configuration is host-specific, so sharing VM configuration between hosts is not a good idea. In that case, any other recommendations on how to deal with the networked homedir case? Thanks!

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[libvirt-users] Setting a VM's vnetX qlen in the XML file
by Digimer 10 Oct '15

10 Oct '15

Hi all, I have a two-node HA RHEL 6 setup hosting VMs. These use static/standard bridges and all has worked wonderfully. Now though, I need to adjust the qlen value of the vnetX devices for a given guest VM, which I can do with: ip link set dev vnet0 qlen 6000 The problem with this approach is two-fold though; 1. I need to determine which vnetX is connected to a VM. 2. If the VM live-migrates, the qlen of the vnetX on the new host needs to be updated. This causes an issue where network traffic is impacted until the command is (re)ran. So I am hoping there is a way I can define the qlen right in the VM's XML definition file so that it is set when the vnetX device is created. Is this possible? Thanks! -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?

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[libvirt-users] ceph vs gluster as libvirt backend
by Patrick F. Marques 10 Oct '15

10 Oct '15

Hi Hi, I looking for some info about using ceph or gluster as VMs disk backend, anyone has some experience on this? I never used any of them. If someone could share some issues or strengths on integration or even some performance details/stories, I appreciate. Regards, Patrick Marques

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[libvirt-users] autpfs + nfs stuck on stat() inside libvirt lxc 1.2.18
by mxs kolo 09 Oct '15

09 Oct '15

Hi all. Has someone success story with using autofs + nfs inside libvirt LXC container ? In my case nfs client and server in lxc work just fine, but with autofs hang on system call state(). I use CE7_64 on nodes and inside container with libvirt 1.2.18 May be I must set some of capabilities in <feature> (http://man7.org/linux/man-pages/man7/capabilities.7.html) ? I try only CAP_SYS_ADMIN and it's no solve problem. b.r. Maxim Kozin

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