Sample backup script using ZFS snapshot

snapshotzfs.sh

#!/bin/bash

SCRIPTPATH=$(cd "$(dirname "$0")" && pwd)

ZFSFILESYSTEM=zpool_tank/my_backups
ZFSMOUNTPOINT=/zpool_tank/my_backups

TODAY=`date +%Y%m%d`
YESTERDAY=`date --date="1 days ago" +%Y%m%d`
ERROR=0

MSG=()
LOGFILE=${SCRIPTPATH}/log/lastlog.log"
_V=1
NOSNAPSHOT=0

while [ $# -gt 0 ]; do
	case $1 in
		-n)
			NOSNAPSHOT=1
			shift
			;;
		--)
			shift
			break
			;;
		*)
			echo "Internal Error: option processing error: $1" 1>&2
			exit 1
			;;
	esac
done

do_rsync() {

	# do rsync

	SRV=$1
	WHAT=$2
	DEST=$3

	echo Make rsync $SRV | tee -a ${LOGFILE}

	rsync -avp --progress --delete --bwlimit=999k --exclude-from=${SCRIPTPATH}/excluded.txt -e "ssh -i /home/user/.ssh/my-key" user@$SRV:$WHAT ${ZFSMOUNTPOINT}/$DEST/ 2>&1 | tee -a ${LOGFILE}

	EL=${PIPESTATUS[0]}

	if [ $EL -ne 0 ]
	then
		# Rsync error

		echo Rsync error $SRV $EL | tee -a ${LOGFILE}

	else

		echo Rsync OK $SRV $EL | tee -a ${LOGFILE}

	fi

}

echo Backup $TODAY `date +%H%M` | tee ${LOGFILE}

if [ ${NOSNAPSHOT} -eq 0 ]
then
	# Take a snapshot

	echo Take zfs snapshot @${YESTERDAY} | tee -a ${LOGFILE}

	sudo zfs snapshot ${ZFSFILESYSTEM}@${YESTERDAY} 2>&1 | tee -a ${LOGFILE}

	EL=${PIPESTATUS[0]}

else

	# No snapshot option provided

	echo I do not make a snapshot, rsync only | tee -a ${LOGFILE}

	EL=0

fi

# Check zfs snapshot command errorlever

if [ $EL -eq 0 ]
then

   # if zfs snapshot was OK
   # call function do_rsync

   # do_rsync 	SRV WHAT DEST
   # SRV = remote machine 
   # WHAT = remote path we want to backup
   # DEST = this is a directory inside the destination zfs mountpoint

	do_rsync 192.168.100.100 /opt/tomcat/ tomcat

else

	echo Error taking zfs snapshot $EL | tee -a ${LOGFILE}

fi