OpenNebula Live Migration Examples

migrate_live_ssh

#!/usr/bin/env bash
#
# Live migration-over-SSH script for use with OpenNebula.
# Set the 'migrate' action to run this script in /etc/one/oned.conf
# for your respective virtualization type. Only KVM is supported right now.
#
# Author: Leroy Förster <[email protected]>
# Contributor: Paul Jost <paul.jost.immonet.de>
#
# (c) 2019 Immowelt Hamburg GmbH
# Released under the MIT License.
#

set -xeuo pipefail

source "$(dirname "$0")/kvmrc"
source "$(dirname "$0")/../../scripts_common.sh"

VIRSH_COMMAND="virsh --connect $LIBVIRT_URI"

get_disks(){
    ssh -n "$src_host" -- "$VIRSH_COMMAND" domblklist "$deploy_id" | strings | tail -n+3 | awk '{print $2}'
}

get_size_of_disk_img(){
    qemu_img_path="$1"

    ssh -n "$src_host" -- qemu-img info -U "$qemu_img_path" --output json | sed -nE 's/^.*"virtual-size": ([0-9]+).*/\1/p'
}

create_target_disk_img(){
    qemu_img_path="$1"
    size="$2"

    ssh -n "$dest_host" -- mkdir -v -p "$(dirname "$qemu_img_path")"
    ssh -n "$dest_host" -- qemu-img create -f qcow2 "$qemu_img_path" "$size"
}

deploy_id="$1"
dest_host="$2"
src_host="$3"

get_disks | while read -r disk
do
    create_target_disk_img "$disk" "$(get_size_of_disk_img "$disk")"
done

# Snapshots must be removed before migration
snapshots="$(ssh -n "$src_host" -- "$VIRSH_COMMAND" snapshot-list "$deploy_id" --name)"
for snapshot in $snapshots
do
    ssh -n "$src_host" -- "$VIRSH_COMMAND" snapshot-delete "$deploy_id" --snapshotname "$snapshot" --metadata
done

ssh -n "$src_host" -- "$VIRSH_COMMAND" migrate "$deploy_id" "$QEMU_PROTOCOL://$dest_host/system" --live --copy-storage-all

I've done this based on the scripts in 5.10 now - https://gist.github.com/mzealey/0cac6328c8bbc86c733a72e7a6af89a7