implemented sync mode
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163
zfs-backup.sh
163
zfs-backup.sh
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@ -22,18 +22,18 @@ function snapuse() {
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function human() {
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# found at http://unix.stackexchange.com/a/191787
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nawk 'function human(x) {
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x[1]/=1024;
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if (x[1]>=1000) { x[2]++; human(x); }
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}
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{a[1]=$1; a[2]=0; human(a); printf "%.2f%s\n",a[1],substr("KMGTEPYZ",a[2]+1,1)}' <<< $1
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x[1]/=1024;
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if (x[1]>=1000) { x[2]++; human(x); }
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}
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{a[1]=$1; a[2]=0; human(a); printf "%.2f%s\n",a[1],substr("KMGTEPYZ",a[2]+1,1)}' <<< $1
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}
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function backup() {
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# check source
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check_dataset ${DATASET} || {
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logger -t $(basename ${0%.sh}) -p user.notice "source dataset \"${DATASET}\" in configuration entry #${COUNTER} does not exist; omitting"
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continue 2
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}
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logger -t $(basename ${0%.sh}) -p user.notice "source dataset \"${DATASET}\" in configuration entry #${COUNTER} does not exist; omitting"
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continue 2
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}
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# determine which local snapshots exist already
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SNAPSHOTS=( $(zfs list -rt snapshot -d1 -Ho name -S creation ${DATASET} 2>/dev/null) )
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@ -69,21 +69,24 @@ function backup() {
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# check target
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check_dataset ${SAVETO} || {
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logger -t $(basename ${0%.sh}) -p user.notice "target dataset \"${SAVETO}\" in configuration entry #${COUNTER} does not exist; omitting"
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continue 2
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}
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logger -t $(basename ${0%.sh}) -p user.notice "target dataset \"${SAVETO}\" in configuration entry #${COUNTER} does not exist; omitting"
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continue 2
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}
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R_SNAPSHOTS=( $(${R_RMOD} zfs list -rt snapshot -d1 -Ho name -S creation ${SAVETO}/$( basename ${DATASET}) 2>/dev/null) )
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check_dataset ${SAVETO}/$( basename ${DATASET}) && R_USED_BEFORE=$(snapuse ${SAVETO}/$( basename ${DATASET}))
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# determine current timestamp
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DATE=$(date +%Y-%m-%d-%H%M)
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if [ ${MODE:-backup} == "backup" ]
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then
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# determine current timestamp
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DATE=$(date +%Y-%m-%d-%H%M)
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# determine the name of the current snapshot to create
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NEWSNAP="${DATASET}@${DATE}"
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# take a snapshot
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zfs snapshot -r ${NEWSNAP}
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# determine the name of the current snapshot to create
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NEWSNAP="${DATASET}@${DATE}"
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# take a snapshot
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zfs snapshot -r ${NEWSNAP}
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fi
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# check if source is encrypted
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if [ $ENCRYPTION_FEATURE != "disabled" ]
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@ -103,40 +106,50 @@ function backup() {
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# local snapshot(s) found
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SNAPMODIFIER="i ${LASTSNAP}"
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check_dataset ${SAVETO}/$(basename ${LASTSNAP}) || {
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# last local snapshot is not available at the destination location
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if [ ${#R_SNAPSHOTS[*]} -ge 1 ]
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then
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# remote snapshot(s) found
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R_SNAPMODIFIER="I $(dirname ${DATASET})/$(basename ${R_SNAPSHOTS[*]:(-1)})"
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fi
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# send any previous snapshots
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zfs send -Rcv${RAW_MOD}${R_SNAPMODIFIER} ${LASTSNAP} | ${RMOD:-$R_RMOD} zfs recv -Feu${RESUME_MOD}v ${SAVETO} 2>&1 >> ${LOGFILE}
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}
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# last local snapshot is not available at the destination location
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if [ ${#R_SNAPSHOTS[*]} -ge 1 ]
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then
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# remote snapshot(s) found
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R_SNAPMODIFIER="I $(dirname ${DATASET})/$(basename ${R_SNAPSHOTS[0]})"
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fi
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# send any previous snapshots
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zfs send -Rcv${RAW_MOD}${R_SNAPMODIFIER} ${LASTSNAP} | ${RMOD:-$R_RMOD} zfs recv -Feu${RESUME_MOD}v ${SAVETO} 2>&1 >> ${LOGFILE}
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if [[ ${PIPESTATUS[*]} =~ [1-9]+ ]]
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then
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# replication failure
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logger -t $(basename ${0%.sh}) -p user.notice "failed to replicate ${LASTSNAP} to ${TARGET:-local}:${SAVETO}"
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else
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let CHANGES++
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fi
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}
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else
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# ensure this does not remain in effect
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unset SNAPMODIFIER R_SNAPMODIFIER
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fi
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# send backup
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zfs send -Rcv${RAW_MOD}${SNAPMODIFIER} ${NEWSNAP} | ${RMOD:-$R_RMOD} zfs recv -Feu${RESUME_MOD}v ${SAVETO} 2>&1 >> ${LOGFILE}
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# if replication is unsuccessful, omit the aging check so as to prevent data loss
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if [ $? -eq 0 ]
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if [ ${MODE:-backup} == "backup" ]
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then
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THRESHOLD=$(( $KEEP * 24 * 3600 ))
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for SNAPSHOT in ${SNAPSHOTS[*]}
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do
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TIMESTAMP=$(zfs get -pHo value creation "${SNAPSHOT}")
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AGE=$(( $NOW - $TIMESTAMP ))
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if [ $AGE -ge $THRESHOLD ]
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then
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zfs destroy -r ${SNAPSHOT} 2>&1 >> ${LOGFILE}
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${RMOD:-$R_RMOD} zfs destroy -r ${SAVETO}/$(basename ${SNAPSHOT}) 2>&1 >> ${LOGFILE}
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fi
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done
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else
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MY_EXIT_CODE=$?
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logger -t $(basename ${0%.sh}) -p user.notice "failed to replicate ${NEWSNAP} (rc: $MY_EXIT_CODE) to ${TARGET:-local}:${SAVETO}, no aging"
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# send backup
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zfs send -Rcv${RAW_MOD}${SNAPMODIFIER} ${NEWSNAP} | ${RMOD:-$R_RMOD} zfs recv -Feu${RESUME_MOD}v ${SAVETO} 2>&1 >> ${LOGFILE}
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# if replication is unsuccessful, omit the aging check so as to prevent data loss
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if [[ ! ${PIPESTATUS[*]} =~ [1-9]+ ]]
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then
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let CHANGES++
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THRESHOLD=$(( $KEEP * 24 * 3600 ))
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for SNAPSHOT in ${SNAPSHOTS[*]}
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do
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TIMESTAMP=$(zfs get -pHo value creation "${SNAPSHOT}")
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AGE=$(( $NOW - $TIMESTAMP ))
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if [ $AGE -ge $THRESHOLD ]
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then
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zfs destroy -r ${SNAPSHOT} 2>&1 >> ${LOGFILE}
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${RMOD:-$R_RMOD} zfs destroy -r ${SAVETO}/$(basename ${SNAPSHOT}) 2>&1 >> ${LOGFILE}
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fi
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done
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else
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logger -t $(basename ${0%.sh}) -p user.notice "failed to replicate ${NEWSNAP} to ${TARGET:-local}:${SAVETO}, no aging"
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fi
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fi
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# re-evaluate snapshot data usage
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@ -148,34 +161,38 @@ function backup() {
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R_RMOD="ssh ${USER}@${TARGET}"
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fi
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R_USED_AFTER=$(snapuse ${SAVETO}/$( basename ${DATASET}))
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L_DELTA=$(( $L_USED_AFTER - $L_USED_BEFORE ))
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R_DELTA=$(( $R_USED_AFTER - ${R_USED_BEFORE:-0} ))
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if [ ${CHANGES:-0} -gt 0 ]
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then
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# calculate data volume change
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R_USED_AFTER=$(snapuse ${SAVETO}/$( basename ${DATASET}))
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L_DELTA=$(( $L_USED_AFTER - $L_USED_BEFORE ))
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R_DELTA=$(( $R_USED_AFTER - ${R_USED_BEFORE:-0} ))
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for DELTA in L_DELTA R_DELTA
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do
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unset WHAT WHERE
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eval _DELTA=\$$DELTA
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for DELTA in L_DELTA R_DELTA
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do
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unset WHAT WHERE
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eval _DELTA=\$$DELTA
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if [ $_DELTA -lt 0 ]
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then
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_DELTA=$(( $_DELTA * -1 ))
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WHAT="freed"
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fi
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if [ $_DELTA -lt 0 ]
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then
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_DELTA=$(( $_DELTA * -1 ))
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WHAT="freed"
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fi
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if [[ $DELTA =~ ^L ]]
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then
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WHERE="$(dirname ${DATASET})"
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else
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WHERE="${SAVETO}"
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fi
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if [[ $DELTA =~ ^L ]]
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then
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WHERE="$(dirname ${DATASET})"
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else
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WHERE="${SAVETO}"
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fi
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if [ $_DELTA -ne 0 ]
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then
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_DELTA=$(human $_DELTA)
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logger -t $(basename ${0%.sh}) -p user.notice "$_DELTA ${WHAT:-allocated} in \"${WHERE}\" by backing up \"${DATASET}\""
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fi
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done
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if [ $_DELTA -ne 0 ]
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then
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_DELTA=$(human $_DELTA)
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logger -t $(basename ${0%.sh}) -p user.notice "$_DELTA ${WHAT:-allocated} in \"${WHERE}\" by backing up \"${DATASET}\""
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fi
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done
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fi
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# reset remote configuration
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unset R_RMOD RMOD RAW_MOD
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@ -185,7 +202,7 @@ function backup() {
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#### BEGIN LOGIC ####
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while getopts hf:m: OPTION
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while getopts hf:m:s OPTION
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do
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case "$OPTION" in
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f)
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@ -198,6 +215,11 @@ while getopts hf:m: OPTION
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RECIPIENT="$OPTARG"
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;;
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s)
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# sync mode | this could also be a per-target setting to mitigate the need to call multiple jobs
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MODE="sync"
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;;
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h|\?)
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# display help
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usage
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@ -280,6 +302,7 @@ while read -u 4 DATASET SAVETO KEEP ENABLED
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let COUNTER++
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if [ ${ENABLED} == "Y" ]
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then
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# split this function -> snapshot(), sync(), age() ? -> a new backup() would call all three
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backup
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fi
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done 4<<< "$(egrep -v '^(#|$)' "${CFGFILE}")" # graciously overlook any comments or blank lines
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