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#!/bin/bash
#
# vzmigrate is used for VE migration to another node
# Copyright (C) 2000-2007 SWsoft. All rights reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#
# Usage:
# vzmigrate [-r yes|no] [--ssh=<options>] [--keep-dst] [--online] [-v]
# destination_address VEID
# Options:
# -r, --remove-area yes|no
# Whether to remove VE on source HN for successfully migrated VE.
# --ssh=<ssh options>
# Additional options that will be passed to ssh while establishing
# connection to destination HN. Please be careful with options
# passed, DO NOT pass destination hostname.
# --keep-dst
# Do not clean synced destination VE private area in case of some
# error. It makes sense to use this option on big VE migration to
# avoid syncing VE private area again in case some error
# (on VE stop for example) occurs during first migration attempt.
# --online
# Perform online (zero-downtime) migration: during the migration the
# VE hangs for a while and after the migration it continues working
# as though nothing has happened.
# -v
# Verbose mode. Causes vzmigrate to print debugging messages about
# its progress (including some time statistics).
#
# Examples:
# Online migration of VE #101 to foo.com:
# vzmigrate --online foo.com 101
# Migration of VE #102 to foo.com with downtime:
# vzmigrate foo.com 102
# NOTE:
# This program uses ssh as a transport layer. You need to put ssh
# public key to destination node and be able to connect without
# entering a password.
ACT_SCRIPTS_SFX="start stop mount umount"
SSH_OPTIONS=""
SSH="ssh $SSH_OPTIONS"
SCP="scp $SSH_OPTIONS"
online=0
verbose=0
remove_area=1
keep_dst=0
debug=0
confdir="@PKGCONFDIR@/conf"
vzconf="@PKGCONFDIR@/vz.conf"
tmpdir="/var/tmp"
act_scripts=
# Errors:
MIG_ERR_USAGE=1
MIG_ERR_VPS_IS_STOPPED=2
MIG_ERR_CANT_CONNECT=4
MIG_ERR_COPY=6
MIG_ERR_START_VPS=7
MIG_ERR_STOP_SOURCE=8
MIG_ERR_EXISTS=9
MIG_ERR_NOEXIST=10
MIG_ERR_IP_IN_USE=12
MIG_ERR_QUOTA=13
MIG_ERR_CHECKPOINT=$MIG_ERR_STOP_SOURCE
MIG_ERR_MOUNT_VPS=$MIG_ERR_START_VPS
MIG_ERR_RESTORE_VPS=$MIG_ERR_START_VPS
MIG_ERR_OVZ_NOT_RUNNING=14
MIG_ERR_APPLY_CONFIG=15
usage() {
cat <<EOF
This program is used for VE migration to another node
Usage:
vzmigrate [-r yes|no] [--ssh=<options>] [--keep-dst] [--online] [-v]
destination_address <VEID>
Options:
-r, --remove-area yes|no
Whether to remove VE on source HN for successfully migrated VE.
--ssh=<ssh options>
Additional options that will be passed to ssh while establishing
connection to destination HN. Please be careful with options
passed, DO NOT pass destination hostname.
--keep-dst
Do not clean synced destination VE private area in case of some
error. It makes sense to use this option on big VE migration to
avoid syncing VE private area again in case some error
(on VE stop for example) occurs during first migration attempt.
--online
Perform online (zero-downtime) migration: during the migration the
VE hangs for a while and after the migration it continues working
as though nothing has happened.
-v
Verbose mode. Causes vzmigrate to print debugging messages about
its progress (including some time statistics).
EOF
exit $MIG_ERR_USAGE
}
# Logs message
# There are 3 types of messages:
# 0 - error messages (print to stderr)
# 1 - normal messages (print to stdout)
# 2 - debug messages (print to stdout if in verbose mode)
log () {
if [ $1 -eq 0 ]; then
shift
echo -e "Error: " $@ >&2
elif [ $1 -eq 1 ]; then
shift
echo -e $@
elif [ $verbose -eq 1 ]; then
shift
echo -e " " $@
fi
}
# Executes command and returns result of execution
# There are 2 types of execution:
# 1 - normal execution (all output will be printed)
# 2 - debug execution (output will be printed if verbose mode is set,
# in other case stdout and stderr redirected to /dev/null)
logexec () {
if [ $1 -eq 1 -o $verbose -eq 1 ]; then
shift
$@
else
shift
$@ &> /dev/null
fi
return $?
}
undo_conf () {
$SSH "root@$host" "rm -f $vpsconf"
}
undo_act_scripts () {
if [ -n "$act_scripts" ] ; then
$SSH "root@$host" "rm -f $act_scripts"
fi
undo_conf
}
undo_private () {
if [ $keep_dst -eq 0 ]; then
$SSH "root@$host" "rm -rf $VE_PRIVATE"
fi
undo_act_scripts
}
undo_root () {
$SSH "root@$host" "rm -rf $VE_ROOT"
undo_private
}
undo_quota_init () {
$SSH "root@$host" "vzquota drop $VEID"
undo_root
}
undo_quota_on () {
$SSH "root@$host" "vzquota off $VEID"
undo_quota_init
}
undo_sync () {
# Root will be destroed in undo_root
undo_quota_on
}
undo_suspend () {
logexec 2 vzctl chkpnt $VEID --resume
undo_sync
}
undo_dump () {
if [ $debug -eq 0 ]; then
rm -f "$VE_DUMPFILE"
fi
undo_suspend
}
undo_copy_dump () {
$SSH "root@$host" "rm -f $VE_DUMPFILE"
undo_suspend
}
undo_stop () {
if [ "$state" = "running" ]; then
vzctl start $VEID
elif [ "$mounted" = "mounted" ]; then
vzctl mount $VEID
fi
undo_sync
}
undo_source_stage() {
if [ $online -eq 1 ]; then
undo_copy_dump
else
undo_stop
fi
}
undo_quota_dump () {
rm -f "$VE_QUOTADUMP"
undo_source_stage
}
undo_copy_quota () {
$SSH "root@$host" "rm -f $VE_QUOTADUMP"
undo_quota_dump
}
undo_undump () {
logexec 2 $SSH root@$host vzctl restore $VEID --kill
undo_copy_quota
}
get_status() {
exist=$3
mounted=$4
state=$5
}
get_time () {
awk -v t2=$2 -v t1=$1 'BEGIN{print t2-t1}'
}
if [ $# -lt 2 ]; then
usage
fi
while [ ! -z "$1" ]; do
log 1 "OPT:$1"
case "$1" in
--online)
online=1
;;
-v)
verbose=1
;;
--remove-area|-r)
shift
if [ "$1" = "yes" ]; then
remove_area=1
elif [ "$1" = "no" ]; then
remove_area=0;
else
usage
fi
;;
--keep-dst)
keep_dst=1
;;
--ssh=*)
SSH_OPTIONS="$SSH_OPTIONS $(echo $1 | cut -c7-)"
SSH="ssh $SSH_OPTIONS"
SCP="scp $SSH_OPTIONS"
;;
*)
break
;;
esac
shift
done
host=$1
shift
VEID=$1
shift
if [ -z "$host" -o -z "$VEID" -o $# -ne 0 ]; then
usage
fi
vpsconf="$confdir/$VEID.conf"
if [ ! -r "$vzconf" -o ! -r "$vpsconf" ]; then
log 0 "Can't read global config or VE #$VEID config file"
exit $MIG_ERR_NOEXIST
fi
get_status $(vzctl status $VEID)
if [ "$exist" = "deleted" ]; then
log 0 "VE #$VEID doesn't exist"
exit $MIG_ERR_NOEXIST
fi
if [ $online -eq 1 ]; then
log 1 "Starting online migration of VE $VEID on $host"
else
log 1 "Starting migration of VE $VEID on $host"
fi
# Try to connect to destination
if ! logexec 2 $SSH -o BatchMode=yes root@$host /bin/true; then
log 0 "Can't connect to destination address using public key"
log 0 "Please put your public key to destination node"
exit $MIG_ERR_CANT_CONNECT
fi
# Check if OpenVZ is running
if ! logexec 2 $SSH -o BatchMode=yes root@$host /etc/init.d/vz status ; then
log 0 "OpenVZ is not running on the target machine"
log 0 "Can't continue migration"
exit $MIG_ERR_OVZ_NOT_RUNNING
fi
dst_exist=$($SSH "root@$host" "vzctl status $VEID" | awk '{print $3}')
if [ "$dst_exist" = "exist" ]; then
log 0 "VE #$VEID already exists on destination node"
exit $MIG_ERR_EXISTS
fi
if [ $online -eq 1 -a "$state" != "running" ]; then
log 0 "Can't perform online migration of stopped VE"
exit $MIG_ERR_VPS_IS_STOPPED
fi
log 2 "Loading $vzconf and $vpsconf files"
. "$vzconf"
. "$vpsconf"
VE_DUMPFILE="$tmpdir/dump.$VEID"
VE_QUOTADUMP="$tmpdir/quotadump.$VEID"
log 2 "Check IPs on destination node: $IP_ADDRESS"
for IP in $IP_ADDRESS; do
if [ $($SSH "root@$host" "grep -c \" $IP \" /proc/vz/veip") -gt 0 ];
then
log 0 "IP address $IP already in use on destination node"
exit $MIG_ERR_IP_IN_USE
fi
done
log 1 "Preparing remote node"
log 2 "Copying config file"
if ! logexec 2 $SCP $vpsconf root@$host:$vpsconf ; then
log 0 "Failed to copy config file"
exit $MIG_ERR_COPY
fi
logexec 2 $SSH root@$host vzctl set $VEID --applyconfig_map name --save
# vzctl return code 20 or 21 in case of unrecognized option
if [[ $? != 20 && $? != 21 && $? != 0 ]]; then
log 0 "Failed to apply config on destination node"
undo_conf
exit $MIG_ERR_APPLY_CONFIG
fi
for sfx in $ACT_SCRIPTS_SFX; do
file="$confdir/$VEID.$sfx"
if [ -f "$file" ]; then
act_scripts="$act_scripts $file"
fi
done
if [ -n "$act_scripts" ]; then
log 2 "Copying action scripts"
if ! logexec 2 $SCP $act_scripts root@$host:$confdir ; then
log 0 "Failed to copy action scripts"
undo_conf
exit $MIG_ERR_COPY
fi
fi
log 2 "Creating remote VE root dir"
if ! $SSH "root@$host" "mkdir -p $VE_ROOT"; then
log 0 "Failed to make VE root"
undo_act_scripts
exit $MIG_ERR_COPY
fi
log 2 "Creating remote VE private dir"
if ! $SSH "root@$host" "mkdir -p $VE_PRIVATE"; then
log 0 "Failed to make VE private area"
undo_private
exit $MIG_ERR_COPY
fi
log 1 "Initializing remote quota"
log 2 "Quota init"
if ! $SSH "root@$host" "vzctl quotainit $VEID"; then
log 0 "Failed to initialize quota"
undo_root
exit $MIG_ERR_QUOTA
fi
log 2 "Turning remote quota on"
if ! $SSH "root@$host" "vzctl quotaon $VEID"; then
log 0 "Failed to turn quota on"
undo_quota_init
exit $MIG_ERR_QUOTA
fi
log 1 "Syncing private"
if ! rsync -aH --delete --progress \
"$VE_PRIVATE" "root@$host:${VE_PRIVATE%/*}" | \
grep "% of" | awk -v ORS="\r" '{print $10}'; then
log 0 "Failed to sync VE private areas"
undo_quota_on
exit $MIG_ERR_COPY
fi
if [ $online -eq 1 ]; then
log 1 "Live migrating VE"
log 2 "Suspending VE"
time_suspend=$(date +%s.%N)
if ! logexec 2 vzctl chkpnt $VEID --suspend ; then
log 0 "Failed to suspend VE"
undo_sync
exit $MIG_ERR_CHECKPOINT
fi
log 2 "Dumping VE"
if ! logexec 2 vzctl chkpnt $VEID --dump --dumpfile $VE_DUMPFILE ; then
log 0 "Failed to dump VE"
undo_suspend
exit $MIG_ERR_CHECKPOINT
fi
log 2 "Copying dumpfile"
time_copy_dump=$(date +%s.%N)
if ! logexec 2 $SCP $VE_DUMPFILE root@$host:$VE_DUMPFILE ; then
log 0 "Failed to copy dump"
undo_dump
exit $MIG_ERR_COPY
fi
else
if [ "$state" = "running" ]; then
log 1 "Stopping VE"
if ! logexec 2 vzctl stop $VEID ; then
log 0 "Failed to stop VE"
undo_sync
exit $MIG_ERR_STOP_SOURCE
fi
elif [ "$mounted" = "mounted" ]; then
log 1 "Unmounting VE"
if ! logexec 2 vzctl umount $VEID ; then
log 0 "Failed to umount VE"
undo_sync
exit $MIG_ERR_STOP_SOURCE
fi
fi
fi
if [ "$state" = "running" ]; then
log 2 "Syncing private (2nd pass)"
time_rsync2=$(date +%s.%N)
if ! rsync -aH --delete \
"$VE_PRIVATE" "root@$host:${VE_PRIVATE%/*}"; then
log 0 "Failed to sync VE private areas"
undo_source_stage
exit $MIG_ERR_COPY
fi
fi
log 1 "Syncing 2nd level quota"
log 2 "Dumping 2nd level quota"
time_quota=$(date +%s.%N)
if ! vzdqdump $VEID -U -G -T > "$VE_QUOTADUMP"; then
log 0 "Failed to dump 2nd level quota"
undo_quota_dump
exit $MIG_ERR_QUOTA
fi
log 2 "Copying 2nd level quota"
if ! logexec 2 $SCP $VE_QUOTADUMP root@$host:$VE_QUOTADUMP ; then
log 0 "Failed to copy 2nd level quota dump"
undo_quota_dump
exit $MIG_ERR_COPY
fi
log 2 "Load 2nd level quota"
if ! $SSH "root@$host" "(vzdqload $VEID -U -G -T < $VE_QUOTADUMP && \
vzquota reload2 $VEID)"; then
log 0 "Failed to load 2nd level quota"
undo_copy_quota
exit $MIG_ERR_QUOTA
fi
if [ $online -eq 1 ]; then
log 2 "Undumping VE"
time_undump=$(date +%s.%N)
if ! logexec 2 $SSH root@$host vzctl restore $VEID --undump \
--dumpfile $VE_DUMPFILE --skip_arpdetect ; then
log 0 "Failed to undump VE"
undo_copy_quota
exit $MIG_ERR_RESTORE_VPS
fi
log 2 "Resuming VE"
if ! logexec 2 $SSH root@$host vzctl restore $VEID --resume ; then
log 0 "Failed to resume VE"
undo_undump
exit $MIG_ERR_RESTORE_VPS
fi
time_finish=$(date +%s.%N)
log 2 "Times:"
log 2 "\tSuspend + Dump:\t" $(get_time $time_suspend $time_copy_dump)
log 2 "\tCopy dump file:\t" $(get_time $time_copy_dump $time_rsync2)
log 2 "\tSecond rsync:\t" $(get_time $time_rsync2 $time_quota)
log 2 "\t2nd level quota:\t" $(get_time $time_quota $time_undump)
log 2 "\tUndump + Resume:\t" $(get_time $time_undump $time_finish)
log 2 "Total time: " $(get_time $time_suspend $time_finish)
log 1 "Cleanup"
log 2 "Killing VE"
logexec 2 vzctl chkpnt $VEID --kill
logexec 2 vzctl umount $VEID
log 2 "Removing dumpfiles"
rm -f "$VE_DUMPFILE"
$SSH "root@$host" "rm -f $VE_DUMPFILE"
else
if [ "$state" = "running" ]; then
log 1 "Starting VE"
if ! logexec 2 $SSH root@$host vzctl start $VEID ; then
log 0 "Failed to start VE"
undo_copy_quota
exit $MIG_ERR_START_VPS
fi
elif [ "$mounted" = "mounted" ]; then
log 1 "Mounting VE"
if ! logexec 2 $SSH root@$host vzctl mount $VEID ; then
log 0 "Failed to mount VE"
undo_copy_quota
exit $MIG_ERR_MOUNT_VPS
fi
else
log 1 "Turning quota off"
if ! logexec 2 $SSH root@$host vzquota off $VEID ; then
log 0 "failed to turn quota off"
undo_copy_quota
exit $MIG_ERR_QUOTA
fi
fi
log 1 "Cleanup"
fi
if [ $remove_area -eq 1 ]; then
log 2 "Destroying VE"
logexec 2 vzctl destroy $VEID
else
# Move config as veid.migrated to allow backward migration
mv -f $vpsconf $vpsconf.migrated
fi