Backup all libvirt instances

libvirt_backup_all.sh

# Backup virtual maschines
# TODO: debug notes `echo 'backup vm $i'`
# fish
for i in (virsh --connect=qemu:///system list --all --name); [ ! -z $i ] && virsh --connect=qemu:///system dumpxml $i | sudo tee /var/lib/libvirt/images/$i.xml >/dev/null ; end
# bash
#for i in $(virsh --connect=qemu:///system list --all --name); do [ ! -z $i ] && virsh --connect=qemu:///system dumpxml $i | sudo tee /var/lib/libvirt/images/$i.xml >/dev/null ; done

# Create btrfs Snapshot
sudo btrfs subvol snap -r /mnt/btrfs_storage2900G/@var-lib-libvirt-images /mnt/btrfs_storage2900G/@snapshots/@var-lib-libvirt-images-ro

# Mount snapshots volume
sudo mount /dev/sdb1 /mnt/disk -osubvol=@snapshots/@var-lib-libvirt-images-ro

# Mount backup target
sudo mkdir -p /mnt/export/linux00/nas
sudo mount -tnfs4 linux00:/srv/nas /mnt/export/linux00/nas

# Backup 
sudo rsync -aP /mnt/disk /mnt/export/linux00/nas/

# Umount snapshot volume
sudo umount /mnt/disk

# Umount backup target
sudo umount /mnt/export/linux00/nas

# Delete snapshot
sudo btrfs subvol delete /mnt/btrfs_storage2900G/@snapshots/@var-lib-libvirt-images-ro