Snapshot-RSync

Ich sichere 3x täglich per Snapshot meine Daten mit folgendem Script. Zusätzlich führe ich 2x die Woche einen Filesystemcheck auf /backup aus (cronjobs).

Installation

Der Cronjob:

### Daten-Server Backup
4 6,16,19 * * * /usr/local/sbin/snapshot-rsync >/dev/null
### fsck -n
0 5 * * 0 fsck -s -A -N | cut -d] -f2 | cut -d\  -f3 | grep '^/dev/' | xargs fsck -n

Konfiguration

Das Backup-Skript archiviert die Backups wie folgt:

# number of snapshots to archive
savehours=3
savedays=6
saveweeks=4
savemonths=12
saveyears=10

Folgende Verzeichnisse werden gesichert:

# list directories to backup
allsrcdir="
/home/
/srv/
"

#!/bin/bash
# snapshot
# make a snapshot from directories
# an create hourly/daily/monthly/yearly archieves
# ---------
# neobiker (2011)
# originally based on mirror Version 3.11 By Stu Sheldon stu@actusa.net
# ...
# ...
# The directories are named 'snapshot-<year>-<month>-<day>__<hour>'
#
# Each time snapshot runs, it date stamps a file in the <snapshot> directory called
# 'lastrun.time'. This file's date when listing it using ls -laF shows the last
# date and time snapshot ran on that host.
#
# The last thing you need to do is add snapshot in your crontab with the proper
# times and switches.
#
# If you are going for hourly sync's, add the following to your crontab:
# 0 * * * *    /usr/local/sbin/snapshot
#
# Every four hours would be:
# 0 0,4,8,12,16,20  * * *    /usr/local/sbin/snapshot
#
# you get the idea
# ...

#########################################################################
# Start User Config Stuff

# This is the local root of the backup directories. (where to backup to)
# backuproot must be the mount point and will be mounted ro/rw
backuproot=/srv/backup

# root directory for snapshots $backuproot/$snaproot
snaproot="srv-data"

# [remote] host to backup or ""
snaphost=""

# archivehour: hour (2 digits) when the snapshot will be moved to archive dirs
# daily, weekly, monthly, yearly
archivehour=04

# number of snapshots to archive
savehours=3
savedays=6
saveweeks=4
savemonths=12
saveyears=10

# list directories to backup
allsrcdir="
/home/
/srv/
"

# list directories to skip during in backup
# or leave blank
# EXCLUDES=""

EXCLUDES="--filter=. /tmp/excludes-${snaproot}"

cat > /tmp/excludes-${snaproot} << EOF
- lost+found
- /srv/backup
- /srv/snapshot
- /srv/daten/client-backups
- /srv/devel
- /var/spool/squid
- /var/spool/samba
+ *
EOF

# End User Config Stuff
############################################################################
# Start Static Code
PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin

cmdline=$1
lockfile=${backuproot}/${snaproot}/syncing-now

# Typical Unix saving localhost
rsync="rsync -a -R -q --delete"
[ -n "${snaphost}" ] && rsync="${rsync} --numeric-ids -e ssh"

cmonth=`date +'%m'`
doweek=`date +'%w'`
cday=`date +'%d'`

 yeardir=${backuproot}/${snaproot}/yearly
monthdir=${backuproot}/${snaproot}/monthly
 weekdir=${backuproot}/${snaproot}/weekly
  daydir=${backuproot}/${snaproot}/daily
 hourdir=${backuproot}/${snaproot}/hourly

for dir in ${hourdir} ${daydir} ${weekdir} ${monthdir} ${yeardir}; do
  [ -d ${dir} ] || mkdir -p ${dir}
done

snap=`date +'snapshot-%Y-%m-%d__%H'`
snapdir=${hourdir}/${snap}

dosync ()
{
    # search a snapshot-base for rsync
    for dir in ${hourdir} ${daydir} ${weekdir} ${monthdir} ${yeardir}; do
      sync=`/bin/ls -1 ${dir} | tail -1`
      if [ -n "${sync}" ]; then
        rsync="${rsync} --link-dest=${dir}/${sync}"
        break
      fi
    done

    touch $lockfile

    for srcdir in ${allsrcdir}; do
      if [ -n "${snaphost}" ]; then
        srcdir=${snaphost}:${srcdir}
      fi
      ${rsync} "${EXCLUDES}" ${srcdir} ${snapdir}.rsync
    done
    mv ${snapdir}.rsync ${snapdir}

    rm -f $lockfile
}

movesnap ()
{
    case "$1" in
        d)
           dir=$daydir
           nr=$savedays
           from=$hourdir
           ;;
        w)
           dir=$weekdir
           nr=$saveweeks
           from=$daydir
           if [ -e "${from}/`date +'snapshot-%Y-%m-%d__' -d '1 day ago'`${archivehour}" ]; then
               snap=`date +'snapshot-%Y-%m-%d__' -d '1 day ago'`${archivehour}
           else
               snap=`/bin/ls -1 ${from} | tail -1`
           fi
           ;;
        m)
           dir=$monthdir
           nr=$savemonths
           from=$weekdir
           if [ -e "${from}/`date +'snapshot-%Y-%m-%d__' -d '1 week ago'`${archivehour}" ]; then
               snap=`date +'snapshot-%Y-%m-%d__' -d '1 week ago'`${archivehour}
           else
               snap=`/bin/ls -1 ${from} | tail -1`
           fi
           ;;
        y)
           dir=$yeardir
           nr=$saveyears
           from=$monthdir
           if [ -e "${from}/`date +'snapshot-%Y-%m-%d__' -d '1 month ago'`${archivehour}" ]; then
               snap=`date +'snapshot-%Y-%m-%d__' -d '1 month ago'`${archivehour}
           else
               snap=`/bin/ls -1 ${from} | tail -1`
           fi
           ;;
        *)
           echo >&2 "movesnap: unknow option $1, aborting..."
           rm -f ${lockfile}
           rm -f /tmp/excludes-${snaproot}
           umounting
           exit 1
           ;;
    esac

    [ ${nr} -eq 0 ] && return

    if [ -d ${from}/${snap} ]; then
      mv ${from}/${snap} ${dir}
      ln -s ${dir}/${snap} ${from}
    else
      echo >&2 "I can't find snapshot ${from}/${snap}..."
    fi
}

docleanup ()
{
    [ ${savehours} -lt 1 ] && savehours=1
    count=0
    for i in `/bin/ls -r ${hourdir}`; do
      ((count++))
      if [ ${count} -gt ${savehours} ]; then
        rm -Rf ${hourdir}/${i}
      fi
    done

    count=0
    for i in `/bin/ls -r ${daydir}`; do
      ((count++))
      if [ ${count} -gt ${savedays} ]; then
        rm -Rf ${daydir}/${i}
      fi
    done

    count=0
    for i in `/bin/ls -r ${weekdir}`; do
      ((count++))
      if [ ${count} -gt ${saveweeks} ]; then
        rm -Rf ${weekdir}/${i}
      fi
    done

    count=0
    for i in `/bin/ls -r ${monthdir}`; do
      ((count++))
      if [ ${count} -gt ${savemonths} ]; then
        rm -Rf ${monthdir}/${i}
      fi
    done

    count=0
    for i in `/bin/ls -r ${yeardir}`; do
      ((count++))
      if [ ${count} -gt ${saveyears} ]; then
        rm -Rf ${yeardir}/${i}
      fi
    done
}

inuse ()
{
  echo >&2 "I am already syncing snapshot ${snaproot}"
  exit 1
}

mountfail ()
{
  echo >&2 "I can't mount filesystem ${backuproot}"
  exit 1
}

umountfail ()
{
  echo >&2 "I can't unmount filesystem ${backuproot}"
  exit 1
}

mounting ()
{
    mount -o remount,rw ${backuproot} || mountfail
}

umounting ()
{
    mount -o remount,ro ${backuproot} || umountfail
}

####
#### Programm starts here ... ###########################
####

[ -f ${lockfile} ] && inuse
mounting

case ${cmdline} in
  --scalix)        # backup Scalix Mailserver
    ombackup       # start remote-Backup
    ;;
  -y)
    dosync
    movesnap "y"
    docleanup
    ;;
  -m)
    dosync
    movesnap "m"
    docleanup
    ;;
  -w)
    dosync
    movesnap "w"
    docleanup
    ;;
  -d)
    dosync
    movesnap "d"
    docleanup
    ;;
   *)
    dosync
    if [ ${archivehour} -eq `date +'%H'` ]; then
      movesnap "d"
      if [ ${doweek} -eq 0 ]; then
        movesnap "w"
      fi
      if [ ${cday} -eq 01 ]; then
        movesnap "m"
        if [ ${cmonth} -eq 01 ]; then
          movesnap "y"
        fi
      fi
    fi
    docleanup
    ;;
esac

touch ${backuproot}/${snaproot}/lastrun.time
rm -f /tmp/excludes-${snaproot}

umounting
echo "Backup for ${snaproot} is complete..."