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>
# Contributor: Mark Zealey - port to ONE 5.10
#
# (c) 2019 Immowelt Hamburg GmbH
# Released under the MIT License.

source $(dirname $0)/../../etc/vmm/kvm/kvmrc
source $(dirname $0)/../../scripts_common.sh

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

set -eo pipefail

get_disks() {
    virsh --connect $QEMU_PROTOCOL://$src_host/system domblklist "$deploy_id" | strings | tail -n+3 | awk '{print $2}' | tr '\n' ' '
}

get_size_of_disk_img() {
    qemu_img_path="$1"

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

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

    ssh_monitor_and_log "$dest_host" "mkdir -v -p '$(dirname "$qemu_img_path")'" "Failed to make remote directory for $qemu_img_path image"
    ssh_monitor_and_log "$dest_host" "qemu-img create -f qcow2 '$qemu_img_path' '$size'" "Failed to create new qcow image for $qemu_img_path"
}

DISKS=$(get_disks)
if [[ -z "$DISKS" ]]; then
    echo "No disks discovered on remote host"
    exit 1
fi

for disk in $DISKS; do
    create_target_disk_img "$disk" "$(get_size_of_disk_img "$disk")"
done

# migration can't be done with domain snapshots, drop them first
snaps=$(monitor_and_log \
   "virsh --connect $QEMU_PROTOCOL://$src_host/system snapshot-list $deploy_id --name 2>/dev/null" \
   "Failed to get snapshots for $deploy_id")

for snap in $snaps; do
    exec_and_log \
        "virsh --connect $QEMU_PROTOCOL://$src_host/system snapshot-delete $deploy_id --snapshotname $snap --metadata" \
        "Failed to delete snapshot $snap from $deploy_id"
done

virsh --connect $QEMU_PROTOCOL://$src_host/system \
    migrate --live --copy-storage-all $deploy_id $MIGRATE_OPTIONS $QEMU_PROTOCOL://$dest_host/system --verbose

# Clean up the source images. ENABLE THIS WHEN YOU HAVE TESTED WELL
#ssh_monitor_and_log "$src_host" "rm -f $DISKS" || exit 0