hyperreal.coffee

Take snapshot of VM

 1sudo virsh domblklist vm1
 2
 3Target          Source
 4-----------------------------------------------
 5vda             /var/lib/libvirt/images/vm1.img
 6
 7sudo virsh snapshot-create-as \
 8        --domain vm1 \
 9        --name guest-state1 \
10        --diskspec vda,file=/var/lib/libvirt/images/overlay1.qcow2 \
11        --disk-only \
12        --atomic \
13        --quiesce

Ensure qemu-guest-agent is installed inside the VM. Otherwise omit the --quiesce flag, but when you restore the VM it will be as if the system had crashed. Not that big of a deal since the VM’s OS should flush required data and maintain consistency of its filesystems.

1sudo rsync -avhW --progress /var/lib/libvirt/images/vm1.img /var/lib/libvirt/images/vm1-copy.img
2sudo virsh blockcommit vm1 vda --active --verbose --pivot

Full disk backup of VM

Start the guest VM.

1sudo virsh start vm1

Enumerate the disk(s) in use.

1sudo virsh domblklist vm1
2
3Target          Source
4-------------------------------------------------
5vda             /var/lib/libvirt/images/vm1.qcow2

Begin the backup.

1sudo virsh backup-begin vm1
2
3Backup started

Check the job status. “None” means the job has likely completed.

1sudo virsh domjobinfo vm1
2
3Job type:        None

Check the completed job status.

1sudo virsh domjobinfo vm1 --completed
2
3Job type:               Completed
4Operation:              Backup
5Time elapsed:           182     ms
6File processed:         39.250 MiB
7File remaining:         0.000 B
8File total:             39.250 MiB

Now we see the copy of the backup.

1sudo ls -lash /var/lib/libvirt/images/vm1.qcow2*
2
315M -rw-r--r--. 1 qemu qemu 15M May 10 12:22 vm1.qcow2
421M -rw-------. 1 root root 21M May 10 12:23 vm1.qcow2.1620642185

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