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  umount /mnt/backup
 
  umount /mnt/backup
−
== LVM Shadowcopy ==
+
== LVM Shadowcopy[https://wiki.samba.org/index.php/Rotating_LVM_snapshots_for_shadow_copy] ==
 +
* Script smbsnap
 +
#!/bin/bash
 +
#
 +
# written by Christian Schwamborn
 +
# bugs and suggestions to:
 +
# christian.schwamborn[you-know-what-comes-here]nswit.de
 +
#
 +
# published under GNU General Public License v.2
 +
# version 1.0.3 (2007-12-13)
 +
#
 +
# Authors: Christian Schwamborn [CS]
 +
#          Schlomo Schapiro [GSS] sschapiro[you-know-what-comes-here]probusiness.de
 +
#
 +
# History:
 +
# 1.0.1 (2006-11-21) CS  initial release
 +
# 1.0.2 (2007-01-08) CS  snapshottime now in GMT
 +
# 1.0.3 (2007-12-13) GSS added support for extra mount options (for XFS)
 +
#
 +
# You are using this scrip at your own risk, the author is not responsible
 +
# for data damage or losses in any way.
 +
#
 +
# What this is:
 +
# You can use this script to create and manage snapshots for the Samba
 +
# VFS module shadow_copy.
 +
#
 +
# How to use:
 +
# The script provides some commanline parameters which are usefull for
 +
# start/stop scrips (i.e. mount and unmount). Other parameters are usefull
 +
# for cronjobs - add this, for a usual snapshot scenario (without trailing #)
 +
# to your crontab:
 +
#
 +
# 0 12 * * 1-5 root /usr/local/sbin/smbsnap autosnap 0 0
 +
# 0 7 * * 2-5 root /usr/local/sbin/smbsnap autosnap 0 1
 +
# 0 7 * * 1 root /usr/local/sbin/smbsnap autosnap 0 2
 +
# 3,33 * * * * root /usr/local/sbin/smbsnap autoresize all
 +
#
 +
# This takes snapshots at 7:00 and 12:00 every workday and checks every hour
 +
# if a snapshot needs to be resized.
 +
#
 +
# The script has some flaws:
 +
#  -This script currently works only with LVM2, no EVMS support yet
 +
#  -XFS should be easy to implement, but it isn't yet
 +
#  -You must not use dashes in your volumegroups or logical volumes
 +
#  -Be carefull with the configuration, the parameters are not completely
 +
#    checked right now, as the same for the command line parameters
 +
#  -You have to keep track of the freespace of your volumegroups
 +
#  -Be aware, that if your snapshots grow faster than you assumed, they will
 +
#    become unusable. With the configuration shown above, this script checks
 +
#    every 30 minutes if the snapshots are in the need of a resize. If
 +
#    someone has a better idea how to check the snapshots than periodical,
 +
#    let me know plaese.
 +
#
 +
# This script is written for the bash, other shells might work, it also uses
 +
# some external commands: mount, umount, grep, date, bc, logger, lvcreate,
 +
# lvremove, lvresize
 +
#
 +
# There are currently three variables that have to be configured:
 +
#  -SnapVolumes is an array, every element of that array represents a logical
 +
#    volume that is configured for snapshots. Each element is a comma seperated
 +
#    list, which consists of the logical volume itself (i.e. /dev/GROUP1/foo),
 +
#    the start size of the snapshot (in megabytes), the freespace which should
 +
#    be maintained (in megabytes), the space added, when a snapshot is
 +
#    resized (also in megabytes) and optionally additional mount options required
 +
#    for mounting the snapshot, like ",nouuid" for XFS. Please add the leading ","
 +
#    because this parameter will be appended to "mount -o ro" *verbatim*.
 +
#    The number of an element is used as a reference when calling the script
 +
#  -SnapSets is also an array, currently every element just represents the
 +
#    age (in days) of a snapshot of the specific snapshot-set.
 +
#  -OffDays is a simple string with the none work days.
 +
#
 +
# The script will figure out by itself where to mount the snapshots, but the
 +
# original logical volumes has to be mounted fist.
 +
#
 +
# Copy and adjust the following three variables (without #) to a blank file in
 +
# /etc/samba and name it smbsnap.conf. If you place the configuration file
 +
# elsewhere, make sure to adjust the path below.
 +
#
 +
# SnapVolumes=('/dev/GROUP/foo;2000;500;1000;,nouuid' '/dev/GROUP/bar;3000;1000;2000')
 +
# SnapSets=(2 5 20)
 +
# OffDays="Sat Sun"
 +
#
 +
# NOTE TO USERS OF PREVIOUS VERSION !!
 +
#
 +
# The delimiter changed from , to ; to support adding multiple mount options
 +
#
 +
# please convert your smbsnap.conf with sed -e 's/,/;/g' -i /etc/samba/smbsnap.conf
 +
#
 +
# Sorry for the invonvenience ...
 +
#
 +
###############################################################################
 +
 +
        . /etc/samba/smbsnap.conf
 +
 +
        export LANG=en_US.UTF-8
 +
        export LANGUAGE=en_US:en
 +
        SnapDate=$(date -u +%Y.%m.%d-%H.%M).00
 +
        logFile=/var/log/backup.log
 +
        [ -z "${1}" ] || Command=${1}
 +
        [ -z "${2}" ] || LVolume=${2}
 +
        [ -z "${3}" ] || SnapSet=${3}
 +
 +
 +
        ExtraMountOptions=
 +
 +
        # process a single snapshot
 +
        # arguments: Command
 +
        # needs:    SnapShot, VolumePath, SnapSets, OffDays, FreeSize, ReSize
 +
        # provides:  na.
 +
        # local:    cmd, SnapShotPath, CurrSnapSets, Count, Expire, Parameters, SnapState, CurrSize, FillPercet, CurrFreeSize
 +
        function DoSnap()
 +
        {
 +
                cmd=${1}
 +
                SnapShotPath=${VolumePath}/@GMT-$(echo ${SnapShot##*/} | cut -f3-4 -d\-)
 +
 +
                case ${cmd} in
 +
                        # to mount snapshots
 +
                        mount)
 +
                                [ -d ${SnapShotPath} ] || mkdir ${SnapShotPath} || \
 +
                                        logger "${0}: ***error*** - unable to create mountpoint for ${SnapShot}"
 +
                                if mount | grep -q ${SnapShotPath}; then
 +
                                        logger "${0}: ***error*** - snapshot ${SnapShot} is allready mounted to ${SnapShotPath}"
 +
                                else
 +
                                        mount ${SnapShot} ${SnapShotPath} -o ro$ExtraMountOptions >> $logFile 2>&1 || \
 +
                                                logger "${0}: ***error*** - can not mount ${SnapShot} to ${SnapShotPath}"
 +
                                fi
 +
                        ;;
 +
 +
                        # to unmount a snapshots
 +
                        umount)
 +
                                if mount | grep -q ${SnapShotPath}; then
 +
                                        umount -f -l ${SnapShotPath} >> $logFile 2>&1 || \
 +
                                                logger "${0}: ***error*** - can not unmount ${SnapShot} mounted to ${SnapShotPath}"
 +
                                else
 +
                                        logger "${0}: ***error*** - snapshot ${SnapShot} is not mounted to ${SnapShotPath}"
 +
                                fi
 +
                        ;;
 +
 +
                        # to remove expired snapshots
 +
                        clean)
 +
                                CurrSnapSet=$(echo ${SnapShot##*/} | cut -f2 -d\-)
 +
                                if [ ${CurrSnapSet} -ge 0 ] && [ ${CurrSnapSet} -lt ${#SnapSets[@]} ]; then
 +
                                        Expire=$(echo ${SnapSets[${CurrSnapSet}]} | cut -f1 -d,)
 +
 +
                                        # add off-days, if any, to the expire time; we just count work-days
 +
                                        declare -i Count=1
 +
                                        while [ ${Expire} -ge ${Count} ];do
 +
                                                echo ${OffDays} | grep -q $(date -d "-${Count} day" +%a) && Expire=$((${Expire} + 1))
 +
                                                Count=$((${Count} + 1))
 +
                                        done
 +
 +
                                        # compare date now minus expire-time with the snapshot-date
 +
                                        if [ $(( $(date +%s) - ${Expire}*24*60*60 - 12*60*60)) -gt \
 +
                                                        $(date -d "$(echo ${SnapShot##*/} | cut -f3 -d\- |  tr \. \-) \
 +
                                                        $(echo ${SnapShot##*/} | cut -f4 -d\- |  tr \. \:)" +%s) ]; then
 +
                                                # unmount snapshot
 +
                                                if mount | grep -q ${SnapShotPath}; then
 +
                                                        umount -f ${SnapShotPath} >> $logFile 2>&1 || \
 +
                                                                logger "${0}: ***error*** - can not unmount ${SnapShot} mounted to ${SnapShotPath}"
 +
                                                fi
 +
                                                if ! mount | grep -q ${SnapShotPath}; then
 +
                                                        # remove mount-directory
 +
                                                        if [ -d ${SnapShotPath} ]; then
 +
                                                                rmdir ${SnapShotPath} || \
 +
                                                                        logger "${0}: ***error*** - unable to remove mountpoint for ${SnapShot}"
 +
                                                        fi
 +
                                                        # finally remove snapshot
 +
                                                        if /sbin/lvremove -f ${SnapShot} >> $logFile 2>&1;then
 +
                                                                logger "${0}: successfully removed outdated snapshot ${SnapShot}"
 +
                                                        else
 +
                                                                logger "${0}: ***error*** - can not remove logical volume ${SnapShot}"
 +
                                                        fi
 +
                                                fi
 +
                                        fi
 +
                                else
 +
                                        logger "${0}: ***error*** - snapshot-set #${CurrSnapSet} of snaphot ${SnapShot} is not configured"
 +
                                fi
 +
                        ;;
 +
 +
                        # to check periodical if the snapshots have to be resized
 +
                        autoresize)
 +
                                Parameters="--options lv_size,snap_percent --noheadings --nosuffix --separator , --unbuffered --units m"
 +
                                SnapState=$(lvs ${Parameters} ${SnapShot})
 +
                                CurrSize=$(echo ${SnapState} | cut -f1 -d,)
 +
                                FillPercet=$(echo ${SnapState} | cut -f2 -d,)
 +
                                CurrFreeSize=$(echo "${CurrSize}-${CurrSize}/100*${FillPercet}" | bc)
 +
 +
                                if ! [ $(echo "${CurrFreeSize} > ${FreeSize}" | bc) -eq 1 ]; then
 +
                                        if /sbin/lvresize -L +${ReSize}M ${SnapShot} >> $logFile 2>&1; then
 +
                                                logger "${0}: successfully resized snapshot ${SnapShot}"
 +
                                        else
 +
                                                logger "${0}: ***error*** - an error occurred while resizing ${SnapShot}"
 +
                                        fi
 +
                                fi
 +
                        ;;
 +
                esac
 +
        }
 +
 +
 +
        # invoked if all snapshots of a volume are processed
 +
        # arguments: Command
 +
        # needs:    VolumeDevice, VolumePath, SnapSet & functions: DoSnap
 +
        # provides:  SnapShot
 +
        # local:    snapset_tmp, cmd
 +
        function DoAllSnaps()
 +
        {
 +
                cmd=${1}
 +
                [ -z "${SnapSet}" ] || snapset_tmp="${SnapSet}-"
 +
                # checkout if the configured volume exists and is mounted
 +
                if [ -b ${VolumeDevice} ]; then
 +
                        if mount | grep -q "${VolumePath} "; then
 +
                                # process all snapshots of the volume and, if given, of a specific snapshot-set
 +
                                for SnapShot in ${VolumeDevice}-${snapset_tmp}*; do
 +
                                        if [ ${SnapShot} = "${VolumeDevice}-${snapset_tmp}*" ]; then
 +
                                                logger "${0}: ***error*** - no backupset #${SnapSet} found for ${VolumeDevice}"
 +
                                        else
 +
                                                DoSnap ${cmd}
 +
                                        fi
 +
                                done
 +
                        else
 +
                                logger "${0}: ***error*** - logical volume ${VolumeDevice} not mounted to ${VolumePath}"
 +
                        fi
 +
                else
 +
                        logger "${0}: ***error*** - logical volume ${VolumeDevice} does not exist"
 +
                fi
 +
        }
 +
 +
 +
        # creates a new snapshot and mounts it
 +
        # arguments: na.
 +
        # needs:    VolumeDevice, VolumePath, SnapSet, SnapSize, SnapDate & functions: DoAllSnaps, DoSnap
 +
        # provides:  SnapShot
 +
        # local:    na.
 +
  function MakeSnap ()
 +
        {
 +
                case ${SnapSet} in
 +
 +
                        [0-9])
 +
                                if [ "${Command}" = "autosnap" ]; then DoAllSnaps "clean"; fi
 +
                                SnapShot=${VolumeDevice}-${SnapSet}-${SnapDate}
 +
                                if /sbin/lvcreate -L${SnapSize}M -s -n ${SnapShot##*/} ${VolumeDevice} >> $logFile 2>&1; then
 +
                                        logger "${0}: successfully created new snapshot ${SnapShot}"
 +
                                else
 +
                                        logger "${0}: ***error*** - an error occurred while creating snapshot ${SnapShot}"
 +
                                fi
 +
                                DoSnap "mount"
 +
                        ;;
 +
 +
                        *)
 +
                                echo "usage: ${0} snap|autosnap <LV number | all> <Snap-Set Number>"
 +
                        ;;
 +
                esac
 +
        }
 +
 +
 +
        # sets some variables and splits the way for certain commands
 +
        # arguments: one object of the array SnapVolumes
 +
        # needs:    Command, & functions: DoAllSnaps MakeSnap
 +
        # provides:  SnapVolume, VolumeDevice, PVGroupName, LVolumeName, VolumePath, SnapSize, FreeSize, ReSize
 +
        # local:    na.
 +
        function SecondChoice ()
 +
        {
 +
                SnapVolume=${1}
 +
                VolumeDevice=$(echo ${SnapVolume} | cut -f1 -d\;)
 +
                PVGroupName=$(echo ${VolumeDevice} | cut -f3 -d/)
 +
                LVolumeName=$(echo ${VolumeDevice} | cut -f4 -d/)
 +
                VolumePath=$(mount | grep  ^/dev[[:alnum:]/]*${PVGroupName}.${LVolumeName}[\ ] | cut -f3 -d' ')
 +
                SnapSize=$(echo ${SnapVolume} | cut -f2 -d\;)
 +
                FreeSize=$(echo ${SnapVolume} | cut -f3 -d\;)
 +
                ReSize=$(echo ${SnapVolume} | cut -f4 -d\;)
 +
                ExtraMountOptions=$(echo  ${SnapVolume} | cut -f5 -d\;)
 +
 +
                case ${Command} in
 +
 +
                        mount|umount|clean|autoresize)
 +
                                DoAllSnaps ${Command}
 +
                        ;;
 +
 +
                        snap|autosnap)
 +
                                MakeSnap
 +
                        ;;
 +
                esac
 +
        }
 +
 +
 +
# decides if all configured volumes are processed or just a specific one
 +
# arguments: na.
 +
# needs:    Command, LVolume, SnapVolumes & functions: SecondChoice
 +
# provides:  na.
 +
# local:    snp
 +
case ${Command} in
 +
 +
        mount|umount|snap|clean|autosnap|autoresize)
 +
                case ${LVolume} in
 +
 +
                        all)
 +
                                for snp in ${SnapVolumes[@]}; do
 +
                                        SecondChoice ${snp}
 +
                                done
 +
                        ;;
 +
 +
                        [0-9])
 +
                                if [ ${LVolume} -ge 0 ] && [ ${LVolume} -lt ${#SnapVolumes[@]} ]; then
 +
                                        SecondChoice ${SnapVolumes[LVolume]}
 +
                                else
 +
                                        logger "${0}: ***error*** - there is no configured logical volume #${LVolume} for snapshots"
 +
                                fi
 +
                        ;;
 +
 +
                        *)
 +
                        echo "usage: ${0} <command> <LV number | all> [<Snap-Set Number>]"
 +
                        ;;
 +
                esac
 +
        ;;
 +
 +
        *)
 +
                echo "usage: ${0} <command> <LV number | all> [<Snap-Set Number>]"
 +
                echo
 +
                echo "      valid commands are:"
 +
                echo "      mount      - to mount snapshots"
 +
                echo "      umount    - to unmount snapshots"
 +
                echo "      snap      - to make a new snapshot"
 +
                echo "      clean      - to cleanup outdated snapshots"
 +
                echo "      autosnap  - normally used for cronjobs to cleanup"
 +
                echo "                    outdates snapshots an create a new one"
 +
                echo "      autoresize - for a periodical check if snapshots"
 +
                echo "                    needs to be resized"
 +
                echo
 +
                echo "      <LV number> is the number of a logical volume, configured for"
 +
                echo "        snapshots in SnapVolumes, or simply 'all' for all volumes"
 +
                echo "      <Snap-Set Number> is the number of the snapshot-set, configured"
 +
                echo "        in SnapSet. It is optional, except for the commands 'snap' and"
 +
                echo "        'autosnap'"
 +
                echo
 +
        ;;
 +
esac
 +
*Konfiguration /etc/samba/smbsnap.conf
 +
SnapVolumes=('/dev/volg1/lvdaten1;200;50;1000;,nouuid')
 +
SnapSets=(2 5 20)
 +
OffDays="Sat Sun"
 +
 
 +
*Scheduler
 +
0 12 * * 1-5 /root/bin/smbsnap autosnap all 0
 +
0 19 * * 2-5 /root/bin/smbsnap autosnap all 1
 +
0 19 * * 1 /root/bin/smbsnap autosnap all 2
 +
0 20 * * * /root/bin/smbsnap clean all
 +
# 3,33 * * * * /root/bin/smbsnap autoresize all

Aktuelle Version vom 25. September 2015, 14:13 Uhr

tar Backup

Backup erstellen

tar -zcvf name.tar.gz /source

Backup wiederherstellen

tar -C /destination -xzvf name.tar.gz

Rdiff Backup

Backup erstellen

rdiff-backup /source /destination
  • Backup ohne symbolische Links
rdiff-backup --exclude-symbolic-links  /source /destination

Backups anzeigen

rdiff-backup -l /destination

Backup Statistik anzeigen

rdiff-backup-statistics /destination
rdiff-backup --list-increment-sizes /destination

Restore

  • letzte Sicherung
cp /destination / source
  • ältere Sicherungen 
rdiff-backup -l /destination
rdiff-backup /destination/rdiff-backup-data/increments/... /source
  • Wiederhrstellung mittels rdiff-backup-fs
rdiff-backup-fs /mnt/ /destination/rdiff-backup-data/

Entfernen ältere Backups

rdiff-backup --remove-older-than "Datum/Tage(5D)" /destination

Script

#!/bin/bash
logPath1=/var/log/backup/
logFile1=backup$(date "+%y%m%d").log
fileWrite1=$logPath1$logFile1

mount -t cifs -o username="USERNAME",password="PAASWORT" //172.30.4.12/backup /mnt/backup

if [ -f /mnt/backup/mount ]; then
        echo $(date "+%y%m%d-%H%M%S")' Start Backup' >> $fileWrite1
        rdiff-backup --exclude-symbolic-links /mnt/daten1/bereich/ /mnt/backup/daten1/bereich/ >> $fileWrite1
        rdiff-backup --exclude-symbolic-links /mnt/daten1/home/ /mnt/backup/daten1/home >> $fileWrite1
        rdiff-backup --exclude-symbolic-links /mnt/daten1/profile /mnt/backup/daten1/profile >> $fileWrite1
        rdiff-backup --exclude-symbolic-links /mnt/daten1/exchange /mnt/backup/daten1/exchange >> $fileWrite1
        /etc/init.d/postgresql stop
        rdiff-backup --exclude-symbolic-links /var/lib/postgresql/9.3/main /mnt/backup/var >> $fileWrite1
        /etc/init.d/postgresql start
        logger "Externes Backup Erfolgreich"
        echo $(date "+%y%m%d-%H%M%S")' Stop Backup' >> $fileWrite1
else
        echo $(date "+%y%m%d-%H%M%S")' Error Backup' >> $fileWrite1
        logger "Fehler externes Backup"
fi

umount /mnt/backup

LVM Shadowcopy[1]

  • Script smbsnap 
#!/bin/bash
#
# written by Christian Schwamborn
# bugs and suggestions to:
# christian.schwamborn[you-know-what-comes-here]nswit.de
#
# published under GNU General Public License v.2
# version 1.0.3 (2007-12-13)
#
# Authors: Christian Schwamborn [CS]
#          Schlomo Schapiro [GSS] sschapiro[you-know-what-comes-here]probusiness.de
#
# History:
# 1.0.1 (2006-11-21) CS  initial release
# 1.0.2 (2007-01-08) CS  snapshottime now in GMT
# 1.0.3 (2007-12-13) GSS added support for extra mount options (for XFS)
#
# You are using this scrip at your own risk, the author is not responsible
# for data damage or losses in any way.
#
# What this is:
# You can use this script to create and manage snapshots for the Samba
# VFS module shadow_copy.
#
# How to use:
# The script provides some commanline parameters which are usefull for
# start/stop scrips (i.e. mount and unmount). Other parameters are usefull
# for cronjobs - add this, for a usual snapshot scenario (without trailing #)
# to your crontab:
#
# 0 12 * * 1-5 root /usr/local/sbin/smbsnap autosnap 0 0
# 0 7 * * 2-5 root /usr/local/sbin/smbsnap autosnap 0 1
# 0 7 * * 1 root /usr/local/sbin/smbsnap autosnap 0 2
# 3,33 * * * * root /usr/local/sbin/smbsnap autoresize all
#
# This takes snapshots at 7:00 and 12:00 every workday and checks every hour
# if a snapshot needs to be resized.
#
# The script has some flaws:
#   -This script currently works only with LVM2, no EVMS support yet
#   -XFS should be easy to implement, but it isn't yet
#   -You must not use dashes in your volumegroups or logical volumes
#   -Be carefull with the configuration, the parameters are not completely
#    checked right now, as the same for the command line parameters
#   -You have to keep track of the freespace of your volumegroups
#   -Be aware, that if your snapshots grow faster than you assumed, they will
#    become unusable. With the configuration shown above, this script checks
#    every 30 minutes if the snapshots are in the need of a resize. If
#    someone has a better idea how to check the snapshots than periodical,
#    let me know plaese.
#
# This script is written for the bash, other shells might work, it also uses
# some external commands: mount, umount, grep, date, bc, logger, lvcreate,
# lvremove, lvresize
#
# There are currently three variables that have to be configured:
#   -SnapVolumes is an array, every element of that array represents a logical
#    volume that is configured for snapshots. Each element is a comma seperated
#    list, which consists of the logical volume itself (i.e. /dev/GROUP1/foo),
#    the start size of the snapshot (in megabytes), the freespace which should
#    be maintained (in megabytes), the space added, when a snapshot is
#    resized (also in megabytes) and optionally additional mount options required
#    for mounting the snapshot, like ",nouuid" for XFS. Please add the leading ","
#    because this parameter will be appended to "mount -o ro" *verbatim*.
#    The number of an element is used as a reference when calling the script
#   -SnapSets is also an array, currently every element just represents the
#    age (in days) of a snapshot of the specific snapshot-set.
#   -OffDays is a simple string with the none work days.
#
# The script will figure out by itself where to mount the snapshots, but the
# original logical volumes has to be mounted fist.
#
# Copy and adjust the following three variables (without #) to a blank file in
# /etc/samba and name it smbsnap.conf. If you place the configuration file
# elsewhere, make sure to adjust the path below.
#
# SnapVolumes=('/dev/GROUP/foo;2000;500;1000;,nouuid' '/dev/GROUP/bar;3000;1000;2000')
# SnapSets=(2 5 20)
# OffDays="Sat Sun"
#
# NOTE TO USERS OF PREVIOUS VERSION !!
#
# The delimiter changed from , to ; to support adding multiple mount options
#
# please convert your smbsnap.conf with sed -e 's/,/;/g' -i /etc/samba/smbsnap.conf
#
# Sorry for the invonvenience ...
#
###############################################################################

        . /etc/samba/smbsnap.conf

        export LANG=en_US.UTF-8
        export LANGUAGE=en_US:en
        SnapDate=$(date -u +%Y.%m.%d-%H.%M).00
        logFile=/var/log/backup.log
        [ -z "${1}" ] || Command=${1}
        [ -z "${2}" ] || LVolume=${2}
        [ -z "${3}" ] || SnapSet=${3}


        ExtraMountOptions=

        # process a single snapshot
        # arguments: Command
        # needs:     SnapShot, VolumePath, SnapSets, OffDays, FreeSize, ReSize
        # provides:  na.
        # local:     cmd, SnapShotPath, CurrSnapSets, Count, Expire, Parameters, SnapState, CurrSize, FillPercet, CurrFreeSize
        function DoSnap()
        {
                cmd=${1}
                SnapShotPath=${VolumePath}/@GMT-$(echo ${SnapShot##*/} | cut -f3-4 -d\-)

                case ${cmd} in
                        # to mount snapshots
                        mount)
                                [ -d ${SnapShotPath} ] || mkdir ${SnapShotPath} || \
                                        logger "${0}: ***error*** - unable to create mountpoint for ${SnapShot}"
                                if mount | grep -q ${SnapShotPath}; then
                                        logger "${0}: ***error*** - snapshot ${SnapShot} is allready mounted to ${SnapShotPath}"
                                else
                                        mount ${SnapShot} ${SnapShotPath} -o ro$ExtraMountOptions >> $logFile 2>&1 || \
                                                logger "${0}: ***error*** - can not mount ${SnapShot} to ${SnapShotPath}"
                                fi
                        ;;

                        # to unmount a snapshots
                        umount)
                                if mount | grep -q ${SnapShotPath}; then
                                        umount -f -l ${SnapShotPath} >> $logFile 2>&1 || \
                                                logger "${0}: ***error*** - can not unmount ${SnapShot} mounted to ${SnapShotPath}"
                                else
                                        logger "${0}: ***error*** - snapshot ${SnapShot} is not mounted to ${SnapShotPath}"
                                fi
                        ;;

                        # to remove expired snapshots
                        clean)
                                CurrSnapSet=$(echo ${SnapShot##*/} | cut -f2 -d\-)
                                if [ ${CurrSnapSet} -ge 0 ] && [ ${CurrSnapSet} -lt ${#SnapSets[@]} ]; then
                                        Expire=$(echo ${SnapSets[${CurrSnapSet}]} | cut -f1 -d,)

                                        # add off-days, if any, to the expire time; we just count work-days
                                        declare -i Count=1
                                        while [ ${Expire} -ge ${Count} ];do
                                                echo ${OffDays} | grep -q $(date -d "-${Count} day" +%a) && Expire=$((${Expire} + 1))
                                                Count=$((${Count} + 1))
                                        done

                                        # compare date now minus expire-time with the snapshot-date
                                        if [ $(( $(date +%s) - ${Expire}*24*60*60 - 12*60*60)) -gt \
                                                        $(date -d "$(echo ${SnapShot##*/} | cut -f3 -d\- |  tr \. \-) \
                                                        $(echo ${SnapShot##*/} | cut -f4 -d\- |  tr \. \:)" +%s) ]; then
                                                # unmount snapshot
                                                if mount | grep -q ${SnapShotPath}; then
                                                        umount -f ${SnapShotPath} >> $logFile 2>&1 || \
                                                                logger "${0}: ***error*** - can not unmount ${SnapShot} mounted to ${SnapShotPath}"
                                                fi
                                                if ! mount | grep -q ${SnapShotPath}; then
                                                        # remove mount-directory
                                                        if [ -d ${SnapShotPath} ]; then
                                                                rmdir ${SnapShotPath} || \
                                                                        logger "${0}: ***error*** - unable to remove mountpoint for ${SnapShot}"
                                                        fi
                                                        # finally remove snapshot
                                                        if /sbin/lvremove -f ${SnapShot} >> $logFile 2>&1;then
                                                                logger "${0}: successfully removed outdated snapshot ${SnapShot}"
                                                        else
                                                                logger "${0}: ***error*** - can not remove logical volume ${SnapShot}"
                                                        fi
                                                fi
                                        fi
                                else
                                        logger "${0}: ***error*** - snapshot-set #${CurrSnapSet} of snaphot ${SnapShot} is not configured"
                                fi
                        ;;

                        # to check periodical if the snapshots have to be resized
                        autoresize)
                                Parameters="--options lv_size,snap_percent --noheadings --nosuffix --separator , --unbuffered --units m"
                                SnapState=$(lvs ${Parameters} ${SnapShot})
                                CurrSize=$(echo ${SnapState} | cut -f1 -d,)
                                FillPercet=$(echo ${SnapState} | cut -f2 -d,)
                                CurrFreeSize=$(echo "${CurrSize}-${CurrSize}/100*${FillPercet}" | bc)

                                if ! [ $(echo "${CurrFreeSize} > ${FreeSize}" | bc) -eq 1 ]; then
                                        if /sbin/lvresize -L +${ReSize}M ${SnapShot} >> $logFile 2>&1; then
                                                logger "${0}: successfully resized snapshot ${SnapShot}"
                                        else
                                                logger "${0}: ***error*** - an error occurred while resizing ${SnapShot}"
                                        fi
                                fi
                        ;;
                esac
        }


        # invoked if all snapshots of a volume are processed
        # arguments: Command
        # needs:     VolumeDevice, VolumePath, SnapSet & functions: DoSnap
        # provides:  SnapShot
        # local:     snapset_tmp, cmd
        function DoAllSnaps()
        {
                cmd=${1}
                [ -z "${SnapSet}" ] || snapset_tmp="${SnapSet}-"
                # checkout if the configured volume exists and is mounted
                if [ -b ${VolumeDevice} ]; then
                        if mount | grep -q "${VolumePath} "; then
                                # process all snapshots of the volume and, if given, of a specific snapshot-set
                                for SnapShot in ${VolumeDevice}-${snapset_tmp}*; do
                                        if [ ${SnapShot} = "${VolumeDevice}-${snapset_tmp}*" ]; then
                                                logger "${0}: ***error*** - no backupset #${SnapSet} found for ${VolumeDevice}"
                                        else
                                                DoSnap ${cmd}
                                        fi
                                done
                        else
                                logger "${0}: ***error*** - logical volume ${VolumeDevice} not mounted to ${VolumePath}"
                        fi
                else
                        logger "${0}: ***error*** - logical volume ${VolumeDevice} does not exist"
                fi
        }


        # creates a new snapshot and mounts it
        # arguments: na.
        # needs:     VolumeDevice, VolumePath, SnapSet, SnapSize, SnapDate & functions: DoAllSnaps, DoSnap
        # provides:  SnapShot
        # local:     na.
 function MakeSnap ()
        {
                case ${SnapSet} in

                        [0-9])
                                if [ "${Command}" = "autosnap" ]; then DoAllSnaps "clean"; fi
                                SnapShot=${VolumeDevice}-${SnapSet}-${SnapDate}
                                if /sbin/lvcreate -L${SnapSize}M -s -n ${SnapShot##*/} ${VolumeDevice} >> $logFile 2>&1; then
                                        logger "${0}: successfully created new snapshot ${SnapShot}"
                                else
                                        logger "${0}: ***error*** - an error occurred while creating snapshot ${SnapShot}"
                                fi
                                DoSnap "mount"
                        ;;

                        *)
                                echo "usage: ${0} snap|autosnap <LV number | all> <Snap-Set Number>"
                        ;;
                esac
        }


        # sets some variables and splits the way for certain commands
        # arguments: one object of the array SnapVolumes
        # needs:     Command, & functions: DoAllSnaps MakeSnap
        # provides:  SnapVolume, VolumeDevice, PVGroupName, LVolumeName, VolumePath, SnapSize, FreeSize, ReSize
        # local:     na.
        function SecondChoice ()
        {
                SnapVolume=${1}
                VolumeDevice=$(echo ${SnapVolume} | cut -f1 -d\;)
                PVGroupName=$(echo ${VolumeDevice} | cut -f3 -d/)
                LVolumeName=$(echo ${VolumeDevice} | cut -f4 -d/)
                VolumePath=$(mount | grep  ^/dev[[:alnum:]/]*${PVGroupName}.${LVolumeName}[\ ] | cut -f3 -d' ')
                SnapSize=$(echo ${SnapVolume} | cut -f2 -d\;)
                FreeSize=$(echo ${SnapVolume} | cut -f3 -d\;)
                ReSize=$(echo ${SnapVolume} | cut -f4 -d\;)
                ExtraMountOptions=$(echo  ${SnapVolume} | cut -f5 -d\;)

                case ${Command} in

                        mount|umount|clean|autoresize)
                                DoAllSnaps ${Command}
                        ;;

                        snap|autosnap)
                                MakeSnap
                        ;;
                esac
        }


# decides if all configured volumes are processed or just a specific one
# arguments: na.
# needs:     Command, LVolume, SnapVolumes & functions: SecondChoice
# provides:  na.
# local:     snp
case ${Command} in

        mount|umount|snap|clean|autosnap|autoresize)
                case ${LVolume} in

                        all)
                                for snp in ${SnapVolumes[@]}; do
                                        SecondChoice ${snp}
                                done
                        ;;

                        [0-9])
                                if [ ${LVolume} -ge 0 ] && [ ${LVolume} -lt ${#SnapVolumes[@]} ]; then
                                        SecondChoice ${SnapVolumes[LVolume]}
                                else
                                        logger "${0}: ***error*** - there is no configured logical volume #${LVolume} for snapshots"
                                fi
                        ;;

                        *)
                        echo "usage: ${0} <command> <LV number | all> [<Snap-Set Number>]"
                        ;;
                esac
        ;;

        *)
                echo "usage: ${0} <command> <LV number | all> [<Snap-Set Number>]"
                echo
                echo "       valid commands are:"
                echo "       mount      - to mount snapshots"
                echo "       umount     - to unmount snapshots"
                echo "       snap       - to make a new snapshot"
                echo "       clean      - to cleanup outdated snapshots"
                echo "       autosnap   - normally used for cronjobs to cleanup"
                echo "                    outdates snapshots an create a new one"
                echo "       autoresize - for a periodical check if snapshots"
                echo "                    needs to be resized"
                echo
                echo "       <LV number> is the number of a logical volume, configured for"
                echo "         snapshots in SnapVolumes, or simply 'all' for all volumes"
                echo "       <Snap-Set Number> is the number of the snapshot-set, configured"
                echo "         in SnapSet. It is optional, except for the commands 'snap' and"
                echo "         'autosnap'"
                echo
        ;;
esac
  • Konfiguration /etc/samba/smbsnap.conf
SnapVolumes=('/dev/volg1/lvdaten1;200;50;1000;,nouuid')
SnapSets=(2 5 20)
OffDays="Sat Sun"
  • Scheduler
0 12 * * 1-5 /root/bin/smbsnap autosnap all 0
0 19 * * 2-5 /root/bin/smbsnap autosnap all 1
0 19 * * 1 /root/bin/smbsnap autosnap all 2
0 20 * * * /root/bin/smbsnap clean all
# 3,33 * * * * /root/bin/smbsnap autoresize all
Abgerufen von „http://www.puenzel.de/w/index.php?title=Backup&oldid=272“