Live snapshot for VM with state of processes

Release: stable/pike
The snapshot command takes a snapshot for VM with state of processes. The snapshot keep VM state make to be able to do quick-launch of the instance, keep all process and config when snapshot. Note that booting from this special type of snapshot can be tricky but we can fix it. The disk type is changed to QCOW2 instead of RAW and create/restore snapshot via Libvirt.

Create snapshot example

#create external snapshot
virsh snapshot-create-as --domain instance-00000037 \
--name "vm37" \
--description "ciros" \
--diskspec vda,file=/home/sinhvien/iso/disk37.qcow2 \
--disk-only --atomic

#using blockpull to merge root disk with qcow2 disk
virsh blockpull \
--domain instance-00000037 \
--path /home/sinhvien/iso/disk37.qcow2 \
--wait \
--verbose

#create new snapshot
virsh snapshot-create instance-00000037