A simple script that will attempt to perform an incremental backup on a given VM (or VMs). This script is not a replacement for real enterprise grade solutions. This script is what I use as a part of my own personal backup needs as a software dev.
You will need virsh (https://www.libvirt.org/manpages/virsh.html) and
virtnbdbackup (https://github.com/abbbi/virtnbdbackup) installed in order
to perform a snapshot. Getting these installed for your system is out of
scope for this document.
The script has two paramaters;
-d, used to specify what VMs to backup. Multiple VMs may be passed to the script as a comma seperated list (vm1,vm2,vm3). You may also pass in "*" (with double-quotes) and all VMs found on the system will be backed up.-o, the output directory. Only the root of the backup directory needs to be included, the script will generate the rest.-p, prune last months backups if it's the 15th or later in the month.
Backup a single VM.
./vm-snapshot.sh -d vm1 -o /tmp/backup
Next, backup a set of VMs.
./vm-snapshot.sh -d vm1,vm2,vm6 -o /tmp/backup
Finally, backup all VMs found on the system. Use with caution.
./vm-snapshot.sh -d "*" -o /tmp/backup