#!/bin/sh # zfsync: sync zfs pool(s) between two servers # in case of failure, unexpected reboot while syncing, etc.: # # launch "zfsync.sh init" # # or manually: # # - destroy all snapshots on both local & ${bro} # - for i in ftp web mail; do zfs snapshot servers/$i/home@newsync ;done # - for i in ftp web mail; do zfs send servers/$i/home@newsync | ssh ${bro} zfs receive -vFd servers ;done # - for i in ftp web mail; do zfs rename servers/$i/home@newsync servers/$i/home@prevsync ;done # - ssh ${bro} 'for i in ftp web mail; do zfs rename servers/$i/home@newsync servers/$i/home@prevsync ;done' bro="small" pools="ftp mail web" SENDNSCA=/usr/local/sbin/send_nsca\ -H\ 192.168.X.X\ -d\ ';;'\ -c\ /usr/local/etc/nagios/send_nsca.cfg HOSTNAME=`/bin/hostname -f | /usr/bin/cut -d '.' -f 1,1` SERVICENAME=zfsync LOGFILE=/tmp/zfsync.log LOCKFILE=/tmp/zfsync.lock ZROOT=zdata/servers sync_success=1 echo "`date`: ZFSync starting." if [ -e $LOCKFILE ] then echo "ERROR: $0 is already running with pid `cat $LOCKFILE`, check $LOCKFILE" exit 1 fi echo ${$}>$LOCKFILE alert() { echo "${HOSTNAME};;${SERVICENAME};;2;CRITICAL - ZFS Sync failed at `date`, please check ${LOGFILE} for complete report." | ${SENDNSCA} >/dev/null exit $? } if [ $1 ] then if [ $1 = "init" ] then echo "wiping previous syncs" for snapshot in `zfs list -t snapshot -o name | grep -e prevsync -e newsync`; do zfs destroy $snapshot ; done ssh -q ${bro} 'for snapshot in `zfs list -t snapshot -o name | grep -e prevsync -e newsync`; do zfs destroy $snapshot ; done' echo "making full snapshots" for jail in $pools; do zfs snapshot $ZROOT/$jail/home@newsync;done echo "sending full snapshots" for jail in $pools; do zfs send $ZROOT/$jail/home@newsync | ssh -q ${bro} 'zfs receive -vFdu zdata' ;done echo "renaming them to use them as a base for diff snapshots" for jail in $pools; do zfs rename $ZROOT/$jail/home@newsync $ZROOT/$jail/home@prevsync ;done ssh -q ${bro} 'for jail in ftp mail web; do zfs rename zdata/servers/$jail/home@newsync zdata/servers/$jail/home@prevsync ;done' exit $? fi fi for pool in $pools do dataset="$ZROOT/${pool}/home" echo "making new snapshot for ${pool}" zfs snapshot ${dataset}@newsync || alert echo "sending snapshot" ssh -q ${bro} "zfs set readonly=on ${dataset}" || alert sleep 2 zfs send -i @prevsync ${dataset}@newsync | ssh -q ${bro} "zfs receive -vFdu zdata" || alert ssh -q ${bro} "zfs set readonly=off ${dataset}" || alert echo "cleaning" zfs destroy ${dataset}@prevsync || alert zfs rename ${dataset}@newsync ${dataset}@prevsync || alert ssh -q ${bro} "zfs destroy ${dataset}@prevsync && zfs rename ${dataset}@newsync ${dataset}@prevsync" || alert done echo echo "${HOSTNAME};;${SERVICENAME};;0;OK - ZFS Sync succeeded at `date`" | ${SENDNSCA} >/dev/null rm -f $LOCKFILE echo "`date`: ZFSync ending."