Small script to take ZFS snapshot periodically and send it to a remote
host. Will be replace by zfSnap soon (many pull request to add a send option), maybe in v2.1.
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#!/bin/sh
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#
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# 2014/11/14 - Initial script creation
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#
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# Based on snapxfer script by pds from zpool.org
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# https://zpool.org/zfs-snapshots-and-remote-replication/
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#
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# Also main use zfSnap (https://github.com/zfsnap/zfsnap/wiki/zfSnap)
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# Must take the 1.x version (tree legacy). Too many changes in the 2.0.0 beta.
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# Local ZFS filesystems that will have a snapshot
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DATASETS="datastore/vm"
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# Destination host for snapshot replication
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# The user must have enought rights to use `zfs command`
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DHOST="root@192.168.42.52"
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# Output logfile
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LOGFILE="/var/log/snapsend/snapsend.log"
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# Tools that help implement snapshot logic (and transfer soon according the pull-requests)
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ZSNAP="/usr/local/bin/zfSnap.sh"
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# Administrator's email
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MAILADMIN="admin1@localhost,admin2@localhost"
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# List of all ZFS snapshot
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SNAP_LIST=''
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REMOTE_SNAP_LIST=''
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# The prefix to add to the previous snapshot's name which is now useless
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PREFIXSNAP='done_'
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######################################################################
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# Functions #
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######################################################################
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# Returns 0 if snapshot exists
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SnapExists() {
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SNAP_LIST="${SNAP_LIST:-`zfs list -H -o name -t snapshot`}"
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local i
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for i in $SNAP_LIST; do
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[ "$1" = "$i" ] && return 0
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done
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return 1
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}
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# Returns 0 if snapshot exists on the remote host
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RemoteSnapExist() {
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REMOTE_SNAP_LIST="${REMOTE_SNAP_LIST:-`ssh ${1} zfs list -H -o name -t snapshot`}"
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local i
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for i in $REMOTE_SNAP_LIST; do
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[ "$2" = "$i" ] && return 0
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done
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return 1
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}
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######################################################################
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# Main logic #
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######################################################################
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interval=$1
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usage()
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{
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if [ "X${interval}" = "X" ]; then
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printf 'Usage: %s (async|hourly|daily|weekly|purge)\n' $(basename $0)
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printf '\n'
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printf '* Asynchronous DR snapshots are kept for 1 hour\n'
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printf '* Hourly snapshots are kept for 1 day\n'
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printf '* Daily snapshots are kept for one week\n'
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printf '* Weekly snapshots are kept for one month\n'
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printf '\n'
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exit 1
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fi
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}
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if [ ! -f "${LOGFILE}" ]; then
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mkdir -p $(dirname ${LOGFILE})
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touch "${LOGFILE}"
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fi
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case "${interval}" in
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'async' )
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for dset in $DATASETS
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do
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# Take snapshots for asynchronouss DR purposes
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$ZSNAP -v -s -S -a 1h $dset >> $LOGFILE
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# Get the last snapshot name on localhost
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LOCALSNAP=$(zfs list -H -o name -t snapshot -r ${dset} | tail -n1 | cut -d@ -f2)
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#printf 'Local snapshot: %s\n' ${LOCALSNAP}
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# Get the last snapshot name on remote host $DHOST
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DHOSTSNAP=$(ssh ${DHOST} zfs list -H -o name -t snapshot -r ${dset} | tail -n1 | cut -d@ -f2)
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#printf 'Remote snapshot: %s\n' ${DHOSTSNAP}
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# Test if $DHOSTSNAP exist on the local system
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# Recompose the full snapshot name with $dset@$DHOSTSNAP
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if SnapExists "${dset}@${DHOSTSNAP}"; then
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#printf '%s exist on the local system\n' ${DHOSTSNAP}
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printf '%s@%s will be send to %s to replace the old snapshot: %s' ${dset} ${LOCALSNAP} ${DHOST} ${DHOSTSNAP} >> $LOGFILE
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# Send the snapshot the remote host
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# zfs send -I datastore/vm@2014-11-17_11.26.22--1h datastore/vm@2014-11-18_14.19.10--1h | ssh nec02.ipr.univ-rennes1.fr zfs recv datastore/vm
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zfs send -I "${DHOSTSNAP}" "${dset}@${LOCALSNAP}" | ssh "${DHOST}" zfs recv "${dset}"
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printf ' ... done\n' >> $LOGFILE
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else
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# Mail admin
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printf 'ERROR snapshot %s does not exist on the local system\n' ${DHOSTSNAP} | mail ${MAILADMIN} -s 'snapsend_error'
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printf 'ERROR snapshot %s for %s does not exist on the local system\n' ${DHOSTSNAP} ${dset} >> $LOGFILE
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fi
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# Test if the snapshot was successfully receive on the remote host
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if RemoteSnapExist "${DHOST}" "${dset}@${LOCALSNAP}"; then
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printf 'SUCCESS: the snapshot %s for %s exist on the remote host (%s)\n' ${LOCALSNAP} ${dset} ${DHOST} >> $LOGFILE
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# Rename the useless snapshot for the next purge
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zfs rename ${dset}@${DHOSTSNAP} ${dset}@${PREFIXSNAP}${DHOSTSNAP}
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else
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# Mail admin
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printf 'ERROR snapshot %s for %s does not exist on the remote host (%s)\n' ${LOCALSNAP} ${dset} ${DHOST} | mail ${MAILADMIN} -s 'snapsend_error'
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printf 'ERROR snapshot %s for %s does not exist on the remote host (%s)\n' ${LOCALSNAP} ${dset} ${DHOST} >> $LOGFILE
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fi
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done
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printf '\n' >> $LOGFILE
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;;
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'hourly' )
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# take snapshots, keep for one day
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for dset in $DATASETS
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do
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$ZSNAP -v -s -S -a 1d $dset >> $LOGFILE
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done
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printf '\n' >> $LOGFILE
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;;
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'daily' )
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# take snapshots, keep for one week
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for dset in $DATASETS
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do
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$ZSNAP -v -s -S -a 1w $dset >> $LOGFILE
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done
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# Purge snapshots according to TTL
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$ZSNAP -v -s -S -d -p ${PREFIXSNAP} >> $LOGFILE
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printf '\n' >> $LOGFILE
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;;
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'weekly' )
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# take snapshots, keep for one month
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for dset in $DATASETS
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do
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$ZSNAP -v -s -S -a 1m $dset >> $LOGFILE
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done
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printf '\n' >> $LOGFILE
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;;
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'purge' )
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# purge snapshots according to TTL
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$ZSNAP -v -s -S -d
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;;
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* )
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usage
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;;
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esac
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exit 0
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