-#!/bin/bash
-
-# Author: Carl Baldwin & Alan Pippin
-# Description: This script replicates a given zfs filesystem to a given zfs pool.
-# This script will keep all snapshots in sync, removing the ones
-# that have been deleted since the last replicate was performed.
-# This script will only send the new, or missing, snapshots since
-# the last replicate was performed.
-
-# In test mode (test=1) commands are echoed, not executed
-test=0
-
-[ $test == 0 ] && exec >> /var/log/zfs/zfs-replicate.log 2>&1
-
-# Usage: zfs-backup [filesystem] [destination_pool]
-# This script has a limitation with children under a given filesystem.
-# You must initially backup the parent filesystems first using this script
-# before backing up any of the children filesystems.
-
-fs=$1
-fs=${fs%/}
-fsname=${1#*/}
-srcpool=${1%%/*}
-srcfs="${srcpool}/$fsname"
-srcfs=${srcfs%/}
-dstpool=$2
-dstfs="${dstpool}/$srcfs"
-dstfs=${dstfs%/}
-nodstsnaps=0
-common=""
-
-if [ $test == 1 ]; then
- echo "fs: $fs"
- echo "fsname: $fsname"
- echo "srcpool: $srcpool"
- echo "srcfs: $srcfs"
- echo "dstpool: $dstpool"
- echo "dstfs: $dstfs"
-fi
+#/bin/bash
+
+# Usage: replicate <hostname> <zfs filesystem>
+remote=$1
+remote_fs=$2
+remote_pool=${2%%/*}
+
+# Set this variable to '1' to use the legacy, non-marker, snapshot diff, replicate script logic
+use_legacy_replicate=0
-if ! zpool list -H "$srcpool" >/dev/null 2>&1; then
- echo >&2 "-E- The source pool, '$srcpool' doesn't seem to exist."
+# Set the name of the local pool used to store the backup of the remote
+local_pool=backups
+
+# Make sure we have valid arguments
+if [[ -z "$remote" ]] || [[ -z "$remote_fs" ]]; then
+ echo "Usage: $0 <hostname> <zfs filesystem>"
exit 1
fi
-if ! zpool list -H "$dstpool" >/dev/null 2>&1; then
- echo >&2 "-E- The destination pool, '$dstpool' doesn't seem to exist."
+# Make sure the local pool and local receiving filesystem exist, or print some errors
+if ! zpool list -H "$local_pool" >/dev/null 2>&1; then
+ echo >&2 "-E- The local pool, '$local_pool' doesn't seem to exist."
+ exit 1
+fi
+if ! zfs list "$local_pool/$remote_pool" >/dev/null 2>&1; then
+ echo >&2 "-E- The local filesystem for the remote pool, '$local_pool/$remote_pool' doesn't seem to exist."
+ echo >&2 " You will need to create this filesystem before this script can replicate your data."
+ echo >&2 " You can create this filsystem by executing this command: 'zfs create $local_pool/$remote_pool'"
exit 1
fi
-if ! zfs list -rH -t snapshot "$dstfs" 2>&1 | grep "$dstfs@" > /dev/null 2>&1; then
- echo >&2 "-W- No snapshots detected on the destination drive for this filesystem"
- nodstsnaps=1
+# Obtain the zpool guid for the local pool
+local_pool_guid=`zpool get guid $local_pool 2>&1 | grep $local_pool | awk '{ print $3 }'`
+if ! zpool get guid $local_pool > /dev/null 2>&1; then
+ echo >&2 "-E- Unable to extract the guid for the local pool: $local_pool"
+ exit 1
fi
-if [ $nodstsnaps == 0 ]; then
- zfs list -rH -t snapshot $srcfs | grep "$srcfs@" | awk '{print $1}' > /tmp/source-list
- zfs list -rH -t snapshot $dstfs | grep "$dstfs@" | sed "s,$dstpool/,," | awk '{print $1}' > /tmp/destination-list
- diff -u /tmp/source-list /tmp/destination-list | grep -v '^+++' | awk '/^\+/ {print}' | sed "s,^\+,$dstpool/," > /tmp/obsolete-snapshots
- rm -f /tmp/source-list /tmp/destination-list
-
- echo >&2 "Removing obsolete backups from the destination pool"
- for snapshot in $(cat /tmp/obsolete-snapshots); do
- echo >&2 "Removing '$snapshot' from destination."
- [ $test == 0 ] && zfs destroy "$snapshot"
- done
-
- echo >&2 "Rolling back to the most recent snapshot on the destination."
- [ $test == 0 ] && zfs rollback $(zfs list -rH -t snapshot $dstfs | grep "$dstfs@" | awk '{snap=$1} END {print snap}')
-
- echo >&2 "Calculating the most recent common snapshot between the two filesystems."
- if zfs list -H "$dstfs" > /dev/null 2>&1; then
- for snap in $(zfs list -rH -t snapshot "$dstfs" | grep "$dstfs@" |
- sed 's,.*@,,' | awk '{print$1}'); do
- if zfs list -rH -t snapshot "$fs" | grep "$fs@" | sed 's,.*@,,' | awk '{print$1}' | grep "^${snap}$" >/dev/null 2>&1; then
- common=$snap
- fi
- done
- fi
+# Turn on shell verbosity
+set -x
+
+# Setup our backup marker names
+current_backup_marker=${remote_fs}@current-backup-${local_pool_guid}
+previous_backup_marker=${remote_fs}@previous-backup-${local_pool_guid}
+
+# The ssh connection doesn't find zfs without this.
+zfs=/usr/sbin/zfs
+
+# List the snapshots on the remote machine.
+remote_list=$(mktemp /tmp/replicate.XXXXXX)
+ssh $remote \
+ $zfs list -H -t snapshot |
+ grep ^${remote_fs}@ |
+ awk '{print$1}' > $remote_list
+if [[ $? != 0 ]]; then
+ echo "-E- remote $zfs list command failed"
+ exit 1
fi
-base=$common
-foundcommon=false
-if [ -z "$common" ]; then
- foundcommon=true
+# List the snapshots on the local machine.
+local_list=$(mktemp /tmp/replicate.XXXXXX)
+$zfs list -H -t snapshot |
+ grep ^${local_pool}/${remote_fs}@ |
+ awk '{gsub(/^${local_pool}./,"",$1); print$1}' > $local_list
+if [[ $? != 0 ]]; then
+ echo "-E- local $zfs list command failed"
+ exit 1
fi
-for snap in $(zfs list -rH -t snapshot "$fs" | grep "$fs@" |
- sed 's,.*@,,' | awk '{print$1}'); do
- if [ "$snap" = "$common" ]; then
- foundcommon=true
- continue
+if [ $use_legacy_replicate == 0 ]; then
+ # Destroy the current backup marker snapshot on the remote system if it exists
+ grep -q ${current_backup_marker} $remote_list
+ if [ $? == 0 ]; then
+ ssh $remote $zfs destroy ${current_backup_marker}
+ if [[ $? != 0 ]]; then
+ echo "-E- remote $zfs destroy command failed"
+ exit 1
+ fi
+ fi
+ # Create the current backup marker snapshot on the remote system
+ ssh $remote $zfs snapshot ${current_backup_marker}
+ if [[ $? != 0 ]]; then
+ echo "-E- remote $zfs snapshot command failed"
+ exit 1
fi
- if $foundcommon; then
- if [ -z "$base" ]; then
- echo >&2 "Sending '$fs@$snap'"
- [ $test == 0 ] && zfs set readonly=on "$dstpool"
- [ $test == 0 ] && zfs set atime=off "$dstpool"
- [ $test == 0 ] && zfs set sharenfs=off "$dstpool"
- [ $test == 0 ] && zfs set mountpoint=legacy "$dstpool"
- [ $test == 0 ] && zfs send "$fs@$snap" | zfs recv -v "$dstfs"
- else
- echo >&2 "Sending '$fs@$base' -> '$fs@$snap'"
- [ $test == 0 ] && zfs send -i "$fs@$base" "$fs@$snap" | zfs recv -v "$dstfs"
+ # Check to see if the previous backup marker exists in the remote snapshot list.
+ # Check to see if the previous backup marker exists in the local snapshot list.
+ # If the previous backup markers exists, perform an incremental replicate.
+ # Otherwise, perform a full replicate.
+ grep -q ${previous_backup_marker} $remote_list
+ full=$?
+ grep -q ${previous_backup_marker} $local_list
+ full=$(($full || $?))
+
+ if [[ $full == 0 ]]; then
+ ssh $remote $zfs send -R -I${previous_backup_marker} ${current_backup_marker} |
+ $zfs receive -vF -d ${local_pool}/${remote_fs%/*}
+ if [[ $? != 0 ]]; then
+ echo "-E- remote incremental $zfs send command failed"
+ exit 1
+ fi
+ else
+ ssh $remote $zfs send -R ${current_backup_marker} |
+ $zfs receive -vF -d ${local_pool}/${remote_fs%/*}
+ if [[ $? != 0 ]]; then
+ echo "-E- remote full $zfs send command failed"
+ exit 1
fi
- base=$snap
fi
-done
+
+ # destroy the previous backup markers now that we've replicated past them
+ $zfs destroy ${local_pool}/${previous_backup_marker} > /dev/null 2>&1
+ ssh $remote $zfs destroy ${previous_backup_marker} > /dev/null 2>&1
+
+ # Rename the current backup marker to be the previous backup marker
+ $zfs rename ${local_pool}/${current_backup_marker} ${local_pool}/${previous_backup_marker}
+ if [[ $? != 0 ]]; then
+ echo "-E- local $zfs rename command failed"
+ exit 1
+ fi
+ ssh $remote $zfs rename ${current_backup_marker} ${previous_backup_marker}
+ if [[ $? != 0 ]]; then
+ echo "-E- remote $zfs rename command failed"
+ exit 1
+ fi
+
+else
+ # See what the most recent snapshot on the remote end is.
+ latest=$(tail -n 1 $remote_list)
+
+ # I did this to make sure that diff would always display the most recent common
+ # Since we're keying off the context of the diff, we need to ensure we will get context
+ # by injecting a known difference in case no others exist in the lists.
+ echo bogus.remote >> $remote_list
+ echo bogus.local >> $local_list
+ common=$(diff -u $remote_list $local_list | grep '^ ' | tail -n 1)
+
+ if [ -n "$common" ]; then
+ # We found a common snapshot
+ ssh $remote $zfs send -R -I${common/*@/@} $latest |
+ $zfs receive -vF -d ${local_pool}/${remote_fs%/*}
+ else
+ # We did not find a common snapshot, so send the entire filesystem
+ ssh $remote $zfs send -R $latest |
+ $zfs receive -vF -d ${local_pool}/${remote_fs%/*}
+ fi
+fi
+
+# Remove tmp files
+#rm -f $local_list $remote_list
-true
projects / zfs-ubuntu / .git / blobdiff