Virsh blockcommit
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↑ https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit
↑ https://github.com/milkey-mouse/backup-vm/issues/17#issuecomment-547843000
virsh blockcommit domain path [bandwidth] [--bytes] [base] [--shallow] [top] [--delete] [--keep-relative] [--wait [--async] [--verbose]] [--timeout seconds] [--active] [{--pivot | --keep-overlay}]
Requires at least QEMU 2.1 and libvirt-1.2.9 (2014).[1]
Review your security_driver configuration in /ect/libvirt/qemu.conf. You may need to change it to none to allow virsh blockcommit
security_driver = "none"[2]
Options:
--activeto trigger a two-phase active commit--pivotmaking base the new active image and invalidating top--wait--verbosepath, path specifies fully-qualified path of the disk; it corresponds to a unique target name (<target dev='name'/>) or source file (<source file='name'/>) for one of the disk devices attached to domain (see also domblklist for listing these names). Bandwidth specifies copying bandwidth limit in MiB/s, although for qemu, it may be non-zero only for an online domain
Contents
Examples
virsh blockcommit MY_DOMAIN_NAME [hdc|vda|xxx] --active Active Block Commit started
virsh blockcommit MY_DOMAIN_NAME vda --active --pivot Successfully pivoted
virsh blockcommit MY_DOMAIN_NAME /path/to/libvirt/MY_DOMAIN_NAME_DISK --active --pivot Successfully pivoted
virsh blockcommit MY_DOMAIN_NAME vda --active --pivot Commit aborted
virsh blockcommit MY_DOMAIN_NAME vda --active --pivot --wait --verbose Block commit: [ 22 %] Successfully pivoted
Use: virsh domblklist VM_NAME --details to find your block name.
Examples with errors
virsh blockcommit MY_DOMAIN_NAME error: command 'blockcommit' requires <path> option
virsh blockcommit MY_DOMAIN_NAME hda --active --pivot error: invalid argument: top '/path/to/libvirt/MY_DOMAIN_NAME.qcow2' in chain for 'hda' has no backing file
virsh blockcommit stable-vm-1 /path/to/libvirt/MY_DOMAIN_NAME_DISK --active --pivot error: block copy still active: disk 'vda' already in active block job
virsh blockcommit MY_DOMAIN_NAME hdc --active --pivot error: block copy still active: disk 'hdc' already in active block job Execute: virsh blockjob MY_DOMAIN_NAME hdc --abort (no output) virsh blockjob MY_DOMAIN_NAME vda --info No current block job for vda
Journalctl errors
Feb 04 16:29:52 SERVER libvirtd[14189]: 2019-11-21 15:08:13.035+0000: 14192: error : qemuDomainBlockCommit:17568 : invalid argument: top '/path/to/file/VM_NAME.qcow2' in chain for 'hda' has no backing file
Feb 04 16:29:52 SERVER libvirtd[14974]: 2020-02-04 12:29:52.421+0000: 14977: error : qemuDomainBlockCommit:17555 : invalid argument: commit of 'hdc' active layer requires active flag
Activities
- Create a KVM Live backup using
virsh snapshot-create-asandvirsh blockcommit - Read https://www.redhat.com/archives/libvirt-users/2015-September/msg00042.html from Eric Blake (Red Hat)
Related terms
virsh blockjob MY_DOMAIN_NAME vda --infovirsh blockpullvirsh snapshot-create-asand--quiesceoption invirsh snapshot-create-asvirsh domblklist
KVM backup.shvirsh domblklist MY_DOMAIN_NAMEvirsh snapshot-list MY_DOMAIN_NAME
See also
virsh blockcopy,virsh blockjob,virsh blockcommit,virsh domblklist,virsh blockresize,virsh blockpullvirsh consolevirsh: Storage information, Connecting, Operations, Memory, Snapshots, Networking, CPU, release notes,virsh nodedev-list- libvirtd:
systemctl status libvirtd,systemctl status libvirt-guests, Libvirt release notes, logs,libvirtd.conf,/etc/libvirt/,/var/log/libvirt/
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