Hi ,
Working on the simple POC : Advanced snapshot using libvirt and qemu . Following are the exact steps which are followed .
1. Created as base VM - Ubuntu 15.10 with following libvirt and qemu versions
Using library: libvirt 1.2.16
Using API: QEMU 1.2.16
Running hypervisor: QEMU 2.3.0
QEMU emulator version 2.3.0 (Debian 1:2.3+dfsg-5ubuntu9.1), Copyright (c) 2003-2008 Fabrice
Bellard
2.Created nested VM (vm-01) using VirtManager on base VM.
3.Used following commands to take the multiple snapshots -
virsh # list
Id Name State
----------------------------------------------------
7 vm-01 running
virsh # domblklist vm-01
Target Source
------------------------------------------------
vda /home/ubuntu/vm-01.img
hda /dev/sr0
snapshot-create-as --domain vm-01 snap1 --diskspec vda,file=/var/lib/libvirt/sn1.qcow2 --disk-only --atomic
snapshot-create-as --domain vm-01 snap2 --diskspec vda,file=/var/lib/libvirt/sn2.qcow2 --disk-only --atomic
virsh #snapshot-list vm-01
------------------------------------------------------------
snap1 2015-12-07 11:51:51 -0800 disk-snapshot
snap2 2015-12-07 11:52:28 -0800 disk-snapshot
virsh # snapshot-list vm-01 --tree
snap1
|
+- snap2
List the current block device in use, again. It can be noticed, the new overlay 'sn2.qcow2' is the current disk in use:
virsh # domblklist vm-01
Target Source
------------------------------------------------
vda /var/lib/libvirt/sn2.qcow2
hda /dev/sr0
Now that the backup is finished, perform active blockcommit by live mergning contents of sn2 into base:
ubuntu@keyurubuntu:~$ virsh blockcommit vm-01 vda --active --verbose --pivot
error: internal error: unable to execute QEMU command 'block-commit': Could not reopen file: Permission denied
I am not sure why this is getting as permission denied. I have tried couple of times reinstalling and creating new VMs . Every time when i have tried to block-commit getting landed into same error.
Is there any troubleshooting or solution to this issue. Stuck on this issue for last 2 days.
Quick help much appreciated.
Thanks,
Keyur Bhalerao
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