kvm-host: add migrate-vm script
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@ -14,6 +14,7 @@ The **patch** part changes incrementally at each release.
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* apache: new variable for mpm mode (+ updated default config accordingly)
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* evolinux-base: add default motd template
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* kvm-host: add migrate-vm script
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* mysql: variable to disable myadd script overwrite (default: True)
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### Changed
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@ -0,0 +1,374 @@
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#!/bin/sh
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# WARN: This script is a work in progress!
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# The happy path works, but the rest is not finalized yet.
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# TODO:
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# * exit with error if there is no DRBD
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# * logging (stdout/stderr + syslog)
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# * more checks, rollback if needed…
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# * different return codes for different errors
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# * migrate "from"
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# * switch to Bash to use local and readonly variables
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VERSION="21.04"
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show_version() {
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cat <<END
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migrate-vm version ${VERSION}
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Copyright 2018-2021 Evolix <info@evolix.fr>,
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Jérémy Lecour <jlecour@evolix.fr>,
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Victor Laborie <vlaborie@evolix.fr>
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and others.
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migrate-vm comes with ABSOLUTELY NO WARRANTY. This is free software,
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and you are welcome to redistribute it under certain conditions.
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See the GNU General Public Licence for details.
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END
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}
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show_help() {
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cat <<END
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migrate-vm migrates KVM/qemu virtual machines between hypervisors
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END
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show_usage
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}
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show_usage() {
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cat <<END
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Usage: migrate-vm --vm <vm-name>
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or migrate-vm --vm <vm-name> --resource <drbd-resource-name>
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or migrate-vm --persistent <vm-name>
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or migrate-vm --transient <vm-name>
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Options
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--vm VM name (from libvirt point of view)
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--resource DRBD resource name (default to VM name)
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--transient Leave VM as defined on hosts
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--persistent Undefine the VM on the source
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and define it on the destination (default)
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--help Print this message and exit
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--version Print version and exit
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END
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}
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persistent() {
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test "${persistent}" -eq 1
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}
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server_ips() {
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ip addr show | grep 'inet '| awk '{print $2}' | cut -f1 -d'/'
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}
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drbd_config_file() {
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echo "/etc/drbd.d/${1:-}.res"
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}
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is_drbd_resource() {
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test -f "$(drbd_config_file "${1:-}")"
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}
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drbd_peers() {
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drbd_config_file=$(drbd_config_file "${1:-}")
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awk '$1 ~ /^on$/ { host = $2 } $1 ~ /^address/ { sub(";$", "", $NF); split($NF, a, ":"); ip = a[1]; printf "%s:%s\n", host, ip }' "${drbd_config_file}"
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}
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is_vm_running_locally() {
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vm=${1:-}
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virsh list --state-running --name | grep --fixed-strings --line-regexp --quiet "${vm}"
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}
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execute_remotely() {
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remote=${1:-}
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shift
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command=${*}
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# shellcheck disable=SC2029
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ssh "${remote}" "${command}"
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}
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set_drbd_role() {
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role=${1:-}
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resource=${2:-}
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remote=${3:-""}
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case "${role}" in
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primary|secondary)
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set_command="drbdadm ${role} ${resource}"
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verify_command="drbdadm role ${resource} | grep --fixed-strings --ignore-case --quiet ${role}/"
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;;
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*)
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echo "Unknown DRBD role '${role}'" >&2
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exit 1
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;;
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esac
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if [ -z "${remote}" ]; then
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retval=$(eval "${set_command}")
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retcode=$?
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if [ ${retcode} != 0 ]; then
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echo "An error occured while setting ${resource} as ${role} : ${retval}" >&2
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exit 1
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fi
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retval=$(eval "${verify_command}")
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retcode=$?
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if [ ${retcode} != 0 ]; then
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echo "Role has not been set to ${role} on ${resource}. Abort!" >&2
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exit 1
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fi
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else
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retval=$(execute_remotely "${remote}" "${set_command}")
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retcode=$?
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if [ ${retcode} != 0 ]; then
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echo "An error occured while remotely setting ${resource} as ${role} : ${retval}" >&2
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exit 1
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fi
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retval=$(execute_remotely "${remote}" "${verify_command}")
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retcode=$?
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if [ ${retcode} != 0 ]; then
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echo "Role has not been remotely set to ${role} on ${resource}. Abort!" >&2
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exit 1
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fi
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fi
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}
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define_vm() {
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vm=${1:-}
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remote=${2:-}
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if [ -z "${remote}" ]; then
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# retval=$(virsh define "${vm}")
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# retcode=$?
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# if [ ${retcode} != 0 ]; then
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# >&2 echo "An error occured while defining ${vm} : ${retval}"
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# exit 1
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# fi
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echo "Defining a VM locally is not supported yet. Let's skip this step." >&2
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else
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retval=$(virsh dumpxml "${vm}" | ssh "${remote}" virsh define /dev/stdin)
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retcode=$?
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if [ ${retcode} != 0 ]; then
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echo "An error occured while remotely defining ${vm} : ${retval}" >&2
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exit 1
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fi
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fi
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}
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undefine_vm() {
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vm=${1:-}
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remote=${2:-}
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command="virsh undefine ${vm}"
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if [ -z "${remote}" ]; then
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retval=$(eval "${command}")
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retcode=$?
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if [ ${retcode} != 0 ]; then
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echo "An error occured while undefining ${vm} : ${retval}" >&2
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exit 1
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fi
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else
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retval=$(execute_remotely "${remote}" "${command}")
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retcode=$?
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if [ ${retcode} != 0 ]; then
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echo "An error occured while remotely undefining ${vm}: ${retval}" >&2
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exit 1
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fi
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fi
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}
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migrate_vm_from() {
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vm=${1:-}
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remote_ip=${2:-}
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current_ip=${3:-}
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export VIRSH_DEFAULT_CONNECT_URI="qemu+ssh://${remote_ip}/system"
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virsh migrate --live --unsafe --verbose "${vm}" "qemu:///system" "tcp://${current_ip}/"
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}
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migrate_vm_to() {
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vm=${1:-}
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remote_ip=${2:-}
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export VIRSH_DEFAULT_CONNECT_URI="qemu:///system"
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virsh migrate --live --unsafe --verbose "${vm}" "qemu+ssh://${remote_ip}/system" "tcp://${remote_ip}/"
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}
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migrate_from() {
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vm=${1:-}
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resource=${2:-}
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remote_ip=${3:-}
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remote_host=${4:-}
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current_ip=${5:-}
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current_host=${6:-}
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echo "Start migration of ${vm} from ${remote_ip} (${remote_host})"
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set_drbd_role primary "${resource}"
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migrate_vm_from "${vm}" "${remote_ip}" "${current_ip}"
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set_drbd_role secondary "${resource}" "${remote_ip}"
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if persistent; then
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define_vm "${vm}"
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undefine_vm "${vm}" "${remote_ip}"
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fi
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}
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migrate_to() {
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vm=${1:-}
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resource=${2:-}
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remote_ip=${3:-}
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remote_host=${4:-}
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echo "Start migration of ${vm} to ${remote_ip} (${remote_host})"
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set_drbd_role primary "${resource}" "${remote_ip}"
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migrate_vm_to "${vm}" "${remote_ip}"
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set_drbd_role secondary "${resource}"
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if persistent; then
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define_vm "${vm}" "${remote_ip}"
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undefine_vm "${vm}"
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fi
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}
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main() {
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vm=${1:-}
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resource=${2:-}
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server_ips=$(server_ips)
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if ! is_drbd_resource "${resource}"; then
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echo "No DRBD resource found for '${resource}\`." >&2
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exit 1
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fi
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for peer in $(drbd_peers "${resource}"); do
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host=$(echo "${peer}" | cut -d':' -f1)
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ip=$(echo "${peer}" | cut -d':' -f2)
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# shellcheck disable=SC2086
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if echo ${server_ips} | grep --quiet "${ip}"; then
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current_ip="${ip}"
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current_host="${host}"
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else
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remote_ip="${ip}"
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remote_host="${host}"
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fi
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done
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if is_vm_running_locally "${vm}"; then
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migrate_to "${vm}" "${resource}" "${remote_ip}" "${remote_host}"
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else
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echo "Migrating \"from\" is not supported yet" >&2
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exit 1
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migrate_from "${vm}" "${resource}" "${remote_ip}" "${remote_host}" "${current_ip}" "${current_host}"
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fi
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}
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if [ "$(id -u)" -ne "0" ] ; then
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echo "This script must be run as root." >&2
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exit 1
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fi
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# Parse options
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# based on https://gist.github.com/deshion/10d3cb5f88a21671e17a
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while :; do
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case $1 in
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-h|-\?|--help)
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show_help
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exit 0
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;;
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-V|--version)
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show_version
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exit 0
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;;
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--transient)
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transient=1
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persistent=0
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;;
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--persistent)
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transient=0
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persistent=1
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;;
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--vm)
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# with value separated by space
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if [ -n "$2" ]; then
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vm=$2
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shift
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else
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printf 'ERROR: "--vm" requires a non-empty option argument.\n' >&2
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exit 1
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fi
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;;
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--vm=?*)
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# with value speparated by =
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vm=${1#*=}
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;;
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--vm=)
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# without value
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printf 'ERROR: "--vm" requires a non-empty option argument.\n' >&2
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exit 1
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;;
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--resource)
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# with value separated by space
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if [ -n "$2" ]; then
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resource=$2
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shift
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else
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printf 'ERROR: "--resource" requires a non-empty option argument.\n' >&2
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exit 1
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fi
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;;
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--resource=?*)
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# with value speparated by =
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resource=${1#*=}
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;;
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--resource=)
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# without value
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printf 'ERROR: "--resource" requires a non-empty option argument.\n' >&2
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exit 1
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;;
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--)
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# End of all options.
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shift
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break
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;;
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-?*|[[:alnum:]]*)
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# ignore unknown options
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printf 'ERROR: Unknown option : %s\n' "$1" >&2
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echo "" >&2
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show_usage >&2
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exit 1
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;;
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*)
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# Default case: If no more options then break out of the loop.
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break
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;;
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esac
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shift
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done
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# Initial values
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vm=${vm:-}
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resource=${resource:-${vm}}
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transient=${transient:-0}
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persistent=${persistent:-1}
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set -u
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set -e
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if [ -z "${vm}" ]; then
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echo "You must provide a VM name" >&2
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echo "" >&2
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show_usage >&2
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exit 1
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fi
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main "${vm}" "${resource}"
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exit 0
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@ -8,3 +8,5 @@
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- include: munin.yml
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- include: images.yml
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- include: tools.yml
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@ -0,0 +1,13 @@
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---
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- include_role:
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name: remount-usr
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- name: migrate-vm scripts is present
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copy:
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src: migrate-vm.sh
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dest: /usr/share/scripts/migrate-vm
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mode: "0755"
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owner: root
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group: root
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force: yes
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