-#!/bin/sh
+#!/bin/bash
# backup.sh
#
# Backup up Unix-like computers
# mind when hacking:
#
# KISS. And by that I mean really simple. Only regular Unix commands, please
-# (but GNU extensions are used).
+# (but GNU extensions are used and moreutils has to be installed).
#
# Because of the way we run this script from cron, informational logging goes
# to stderr and warnings and errors to stdout. This way, we get mail whenever
# stuff fails, and other output is redirected to the log file.
#
-# The computers are backed up in parallell (but the filesystems on each
-# computer in serial). This is implemented highly simplistic, with forking
-# subshells. The script has no concept about threads, and stuff might go wrong,
-# which usually requires manual cleanups.
-#
# The script is halfway Norwegian and halfway English. Newer modifications are
# in English, we should probably stick to that.
-#
-# Known issues:
-#
-# o $R has no proper meaning because of the forking subshell stuff. We need a
-# more robust way of returning non-zero on errors, which we probably don't
-# right now.
-#
+
+# The computer to backup.
+computer=$1
# Configuration
-LOCKFILE=/home/backup/backuprun.lockfile
+LOCKFILE=/home/backup/backuprun.lockfile.$computer
confdir=/home/backup/conf/ # Configuration files
storagedir=/backup # Where we keep backups
maksantallfulle=3 # Number of full backups
exclude=$confdir/exclude
[ ! -f $exclude ] && printf "tmp\ncore\n" > $exclude
-# Initially, we consider everything to be just fine.
-R=0
+if [ -z "$computer" ]; then
+ echo "Usage: $0 COMPUTER"
+ exit 1
+fi
# Die more or less gracefully (at least notify user)
die() {
- echo `date`": Something nasty happened, and since I fork a lot:"
- echo `date`": I CANNOT CLEAN UP THE MESS MYSELF."
- echo `date`": You need to get rid of lost process named stuff like $0, tar and ssh."
- exit 255
+ echo `date`": Something nasty happened. Ending, and not deleting lockfile $LOCKFILE."
+ exit 1
}
# Trap C-c and kill
touch $LOCKFILE
echo $$ > $LOCKFILE
-#syntax of remotestat:
-#hostname:/directory/
-remotestatf=$confdir/remotestat
-[ -f $remotestatf ] && remotestat=`cat $remotestatf`
-###
-
-PATH=/local/bin:$PATH:/store/bin
-export PATH
-
echo `date`": Backup run starting" >&2
umask 027
-# The computers we want to back up
-unixcomputers=`cat $confdir/computers.unix \
- | grep -v "^#" \
- | grep -v "^$" `
-# Backup only one computer, from command line?
-if [ $1 ] ; then
- unixcomputers=$1
-fi;
-
-
-#selve backupen
-# krever at noen variabler er satt
-# krever at vi er i rett katalog
backup()
{
echo -n `date` >&2
printf " $computer: $computer:$filesystem $backuplevel backup\n" >&2
- if [ "$backuplevel" = "daglig" ] || [ "$backuplevel" = "incremental" ]
+ SNARFILE="${storagedir}/${computer}/${sfilesystem}/.incremental.snar"
+ incrementalsnar="/root/.backup/${sfilesystem}.snar"
+ if [ "$backuplevel" = "daglig" ]
then
- lastd=`cat ../.date`
- lastcmd="--newer='$lastd'"
+ # If incremental backup, we need to copy the incremental status to $computer.
+ # If it does not exist, whine a bit and then run date-based instead.
+ if [ -s "$SNARFILE" ]; then
+ if ! scp $SNARFILE root@$computer:$incrementalsnar; then
+ echo `date`" $computer: Could not copy .incremental.snar to $computer"
+ die
+ fi
+ lastcmd="--listed-incremental=$incrementalsnar --no-check-device"
+ else
+ echo `date`" $computer: Missing incremental.snar for $filesystem, doing date-based backup instead until next full backup" >&2
+ incrementalsnar=""
+ lastd=`cat ../.date`
+ lastcmd="--newer='$lastd'"
+ fi
else
- lastcmd=""
- fi
-
- #if this client has a special tar
- #we need to find a better solution to this conf-issue
- if [ -f $confdir/tar.$computer ] ; then
- tar=`cat $confdir/tar.$computer`
- else
- tar=tar
+ lastcmd="--listed-incremental=$incrementalsnar"
fi
# expand the exclude-path for use with tar
exf=`ssh root@$computer "ls ~/.backup/exclude"`
# We try to run tar on the remote computer
- # z gzip it
# c create archive
# C change to directory first
# . where to start taring (see C)
# $lastcmd only files newer than this
# --one-file-system don't traverse file systems
+ # --use-compress-program compress it using gzip or pigz
# --exclude-from file to get exclusion pattern from
# Pipe the stuff over ssh to ourselves, run pee to cat the contents to a
# file and build a file list, respectivly.
TARFILE=$DATE.tmp
- TARCMD="ssh root@$computer \"$tar --one-file-system -zcf - -C $filesystem . $lastcmd \
+ TARCMD="ssh root@$computer \"nice -n 19 ionice -c3 tar --one-file-system --use-compress-program $compressor -cf - -C $filesystem . $lastcmd \
--exclude-from=$exf\" | pee \"cat > $TARFILE\" \"tar tzvf -\""
echo `date`" $computer: Running $TARCMD" >&2
eval $TARCMD > $DATE.idx
- if [ -s $TARFILE ]; then
- # File is >0 in size, we assume it worked.
+ if [ $? -eq 0 ] && [ -s $TARFILE ]; then
+ # File is >0 in size and neither cat or tar tzvf failed; we assume it worked.
+
+ if ! scp root@$computer:$incrementalsnar $SNARFILE.tmp; then
+ echo `date`" $computer: Could not copy .incremental.snar from $computer"
+ die
+ fi
# Move tar file in place
mv $TARFILE $DATE.tgz
+ mv $SNARFILE.tmp $SNARFILE
# Update timestamp
echo $DATEs > ../.date && touch -t $DATE ../.date
- # Make a sorted filelist as well
+ # Make a sorted file list as well
sort -k6 < $DATE.idx > $DATE.sdx
# Fix permissions
chmod 600 *tgz #only for us
chmod 644 *sdx *idx 2>/dev/null #everyone can read
+ # Let the remote computer know that we ran a successful backup (for nagios)
+ ssh root@$computer touch $filesystem/.lastbackup
+
else
# Something wrong happened.
rm $TARFILE
echo `date`" $computer: $TARFILE empty. $backuplevel backup of $computer:$filesystem failed and deleted"
-
- # We don't want to return 0
- R=1
+ die
fi
}
-for computer in $unixcomputers
-do
-(
# Check that the target filesystem is mounted (actually check that it's not
# the root filesystem)
+ if [ ! -d "$storagedir/$computer" ]; then
+ echo `date`" $computer: Target filesystem ($storagedir/$computer) does not exist. Aborting"
+ die
+ fi
rootfilesystem=`df -P /`
targetfilesystem=`df -P "$storagedir/$computer"`
if [ "$rootfilesystem" == "$targetfilesystem" ]; then
echo `date`" $computer: Target filesystem ($storagedir/$computer) was mounted on /. Aborting"
- continue
+ die
fi
echo `date`" $computer: Backing up $computer" >&2
# Try to SSH to the computer without entering a password.
if ! `ssh -n -o NumberOfPasswordPrompts=0 root@$computer /bin/true`; then
echo `date`" $computer: Could not use passwordless SSH."
+ die
+ fi
- # We don't want to return 0
- R=1
- # Do next computer
- continue;
+ # Check if pigz is available
+ if ssh -n root@$computer "pigz -V 2>/dev/null"; then
+ compressor=pigz
+ else
+ echo `date`" $computer: pigz missing; falling back to gzip."
+ compressor=gzip
fi
- filesystems=""
-
# Check dump bit in fstab
filesystems=`ssh -n root@$computer "cat /etc/fstab" \
| grep -v nfs \
# Clean up our dir at this client
if ! ssh root@$computer "rm -r ~/.backup ; mkdir -m 700 ~/.backup"; then
- echo `date`" $computer: Could not create backup staging area at $computer:~/.backup - skipping backup of $computer"
- R=1
- continue;
+ echo `date`" $computer: Could not create backup staging area at $computer:~/.backup"
+ die
fi
# Try to copy $exclude to $computer
if ! scp $exclude root@$computer:~/.backup/exclude > /dev/null; then
- echo `date`" $computer: Could not copy exclude.txt to $computer - skipping backup of $computer"
- R=1
- continue;
+ echo `date`" $computer: Could not copy exclude.txt to $computer"
+ die
fi
# Try to copy preeexec and postexec if they exist
if [ -f $confdir/preexec.$computer ]; then
if ! scp $confdir/preexec.$computer root@$computer:~/.backup/preexec >&2; then
- echo `date`" $computer: Could not copy preexec.$computer to $computer:~/.backup/preexec - skipping backup of $computer"
- R=1
- continue
+ echo `date`" $computer: Could not copy preexec.$computer to $computer:~/.backup/preexec"
+ die
fi
fi
if [ -f $confdir/postexec.$computer ]; then
if ! scp $confdir/postexec.$computer root@$computer:~/.backup/postexec >&2; then
- echo `date`" $computer: Could not copy postexec.$computer to $computer:~/.backup/postexec - skipping backup of $computer"
- R=1
- continue
+ echo `date`" $computer: Could not copy postexec.$computer to $computer:~/.backup/postexec"
+ die
fi
fi
- # Try to run preexec if it exist
+ # Try to run preexec if it exists
if ! ssh root@$computer "[ ! -f ~/.backup/preexec ] || /bin/bash -x ~/.backup/preexec" >&2; then
- echo `date`" $computer: Could not run $computer:~/.backup/preexec - skipping backup of $computer"
- R=1
- continue
+ echo `date`" $computer: Could not run $computer:~/.backup/preexec"
+ die
fi
sfilesystem=`echo $filesystem | tr '\/\$' '__'`
# Prepare storage area
- mkdir -m 755 -p $storagedir/$computer/$sfilesystem/{full,daglig} 2>/dev/null
- echo $filesystem > ${storagedir}/${computer}/.${sfilesystem}.name
- chmod 644 ${storagedir}/${computer}/.${sfilesystem}.name
+ mkdir -m 755 -p $storagedir/$computer/$sfilesystem/full 2>/dev/null
+ mkdir -m 755 -p $storagedir/$computer/$sfilesystem/daglig 2>/dev/null
# Default backuplevel
backuplevel=daglig
fi
# Check if we want a full backup
- printf " $computer $filesystem: $confdir/fastfullbackupdag.$computer.$sfilesystem\n"
if [ -f $confdir/fastfullbackupdag.$computer.$sfilesystem ]; then
fullbackup_min_for_this_machine=$dagermellomfulleforfast
if [ "$DAY_OF_MONTH" = "`cat $confdir/fastfullbackupdag.$computer.$sfilesystem`" ]; then
# Try to run postexec if it exist
if ! ssh root@$computer "[ ! -f ~/.backup/postexec ] || /bin/bash -x ~/.backup/postexec" >&2; then
echo `date`" $computer: Could not run $computer:~/.backup/postexec"
- R=1
+ die
fi
-) &
-done
-
-wait
-
# Remove lockfile
rm $LOCKFILE
-
-# Did anything go wrong?
-# (IMPORTANT NOTE: The R-business does not work as expected, since this script
-# forks itself).
-if [ $R != 0 ]; then
- echo `date`": Backup run ended with errors, check logs."
- exit 1
-else
- echo `date`": Backup run ended" >&2
-fi
projects / backup.sh / blobdiff