4 # Backup up Unix-like computers
8 # This script was first checked into RCS in 2000, and has since backed up a few
9 # servers almost every day, whenever not broken.
11 # It's a bit peculiar, but quite effective. The following is worth keeping in
14 # KISS. And by that I mean really simple. Only regular Unix commands, please
15 # (but GNU extensions are used and moreutils has to be installed).
17 # Because of the way we run this script from cron, informational logging goes
18 # to stderr and warnings and errors to stdout. This way, we get mail whenever
19 # stuff fails, and other output is redirected to the log file.
21 # The script is halfway Norwegian and halfway English. Newer modifications are
22 # in English, we should probably stick to that.
26 # o $R has no proper meaning because of the forking subshell stuff. We need a
27 # more robust way of returning non-zero on errors, which we probably don't
31 # The computer to backup.
35 LOCKFILE=/home/backup/backuprun.lockfile.$computer
36 confdir=/home/backup/conf/ # Configuration files
37 storagedir=/backup # Where we keep backups
38 maksantallfulle=3 # Number of full backups
39 dagermellomfulle=30 # Days between full backups
40 dagermellomfulleforfast=32 # Days between full backups for machines with fixed
41 # full-backup date (in case the fixed day gets missed)
42 DAY_OF_MONTH=`date "+%d" | sed s/^0//` # from 1 to 31
43 DATE=`date "+%Y%m%d%H%M"` #format: touch
44 DATEs=`date "+%Y-%m-%d %H:%M"` #format: tar
47 exclude=$confdir/exclude
48 [ ! -f $exclude ] && printf "tmp\ncore\n" > $exclude
50 if [ -z "$computer" ]; then
51 echo "Usage: $0 COMPUTER"
55 # Die more or less gracefully (at least notify user)
57 echo `date`": Something nasty happened. Ending, and not deleting lockfile $LOCKFILE."
62 trap die SIGINT SIGTERM
64 # Don't start if we're already running
65 if [ -e $LOCKFILE ]; then
66 echo `date`": $LOCKFILE exists for pid `cat $LOCKFILE`, exiting."
67 echo `date`": $LOCKFILE exists for pid `cat $LOCKFILE`, exiting." >&2
73 echo `date`": Backup run starting" >&2
79 # krever at noen variabler er satt
80 # krever at vi er i rett katalog
85 printf " $computer: $computer:$filesystem $backuplevel backup\n" >&2
87 if [ "$backuplevel" = "daglig" ] || [ "$backuplevel" = "incremental" ]
90 lastcmd="--newer='$lastd'"
95 # expand the exclude-path for use with tar
96 exf=`ssh root@$computer "ls ~/.backup/exclude"`
98 # We try to run tar on the remote computer
101 # C change to directory first
102 # . where to start taring (see C)
103 # $lastcmd only files newer than this
104 # --one-file-system don't traverse file systems
105 # --exclude-from file to get exclusion pattern from
106 # Pipe the stuff over ssh to ourselves, run pee to cat the contents to a
107 # file and build a file list, respectivly.
109 TARCMD="ssh root@$computer \"nice -n 19 ionice -c3 tar --one-file-system -zcf - -C $filesystem . $lastcmd \
110 --exclude-from=$exf\" | pee \"cat > $TARFILE\" \"tar tzvf -\""
111 echo `date`" $computer: Running $TARCMD" >&2
112 eval $TARCMD > $DATE.idx
114 if [ -s $TARFILE ]; then
115 # File is >0 in size, we assume it worked.
117 # Move tar file in place
118 mv $TARFILE $DATE.tgz
121 echo $DATEs > ../.date && touch -t $DATE ../.date
123 # Make a sorted filelist as well
124 sort -k6 < $DATE.idx > $DATE.sdx
127 chmod 600 *tgz #only for us
128 chmod 644 *sdx *idx 2>/dev/null #everyone can read
130 # Let the remote computer know that we ran a successful backup (for nagios)
131 ssh root@$computer touch $filesystem/.lastbackup
134 # Something wrong happened.
136 echo `date`" $computer: $TARFILE empty. $backuplevel backup of $computer:$filesystem failed and deleted"
138 # We don't want to return 0
144 # Check that the target filesystem is mounted (actually check that it's not
145 # the root filesystem)
146 rootfilesystem=`df -P /`
147 targetfilesystem=`df -P "$storagedir/$computer"`
148 if [ "$rootfilesystem" == "$targetfilesystem" ]; then
149 echo `date`" $computer: Target filesystem ($storagedir/$computer) was mounted on /. Aborting"
153 echo `date`" $computer: Backing up $computer" >&2
155 # Try to SSH to the computer without entering a password.
156 if ! `ssh -n -o NumberOfPasswordPrompts=0 root@$computer /bin/true`; then
157 echo `date`" $computer: Could not use passwordless SSH."
159 # We don't want to return 0
165 # Check dump bit in fstab
166 filesystems=`ssh -n root@$computer "cat /etc/fstab" \
170 | awk '{ if ( $(NF-1) != "0" ) print $2}' `
172 # Clean up our dir at this client
173 if ! ssh root@$computer "rm -r ~/.backup ; mkdir -m 700 ~/.backup"; then
174 echo `date`" $computer: Could not create backup staging area at $computer:~/.backup - skipping backup of $computer"
178 # Try to copy $exclude to $computer
179 if ! scp $exclude root@$computer:~/.backup/exclude > /dev/null; then
180 echo `date`" $computer: Could not copy exclude.txt to $computer - skipping backup of $computer"
184 # Try to copy preeexec and postexec if they exist
185 if [ -f $confdir/preexec.$computer ]; then
186 if ! scp $confdir/preexec.$computer root@$computer:~/.backup/preexec >&2; then
187 echo `date`" $computer: Could not copy preexec.$computer to $computer:~/.backup/preexec - skipping backup of $computer"
191 if [ -f $confdir/postexec.$computer ]; then
192 if ! scp $confdir/postexec.$computer root@$computer:~/.backup/postexec >&2; then
193 echo `date`" $computer: Could not copy postexec.$computer to $computer:~/.backup/postexec - skipping backup of $computer"
198 # Try to run preexec if it exist
199 if ! ssh root@$computer "[ ! -f ~/.backup/preexec ] || /bin/bash -x ~/.backup/preexec" >&2; then
200 echo `date`" $computer: Could not run $computer:~/.backup/preexec - skipping backup of $computer"
205 for filesystem in $filesystems
207 # Remove / and $ (for Windows) for path names
208 sfilesystem=`echo $filesystem | tr '\/\$' '__'`
210 # Prepare storage area
211 mkdir -m 755 -p $storagedir/$computer/$sfilesystem/full 2>/dev/null
212 mkdir -m 755 -p $storagedir/$computer/$sfilesystem/daglig 2>/dev/null
213 echo $filesystem > ${storagedir}/${computer}/.${sfilesystem}.name
214 chmod 644 ${storagedir}/${computer}/.${sfilesystem}.name
216 # Default backuplevel
219 if [ ! -f $storagedir/$computer/$sfilesystem/.date ]
221 # Take the first full backup of this filesystem on this computer
223 echo $DATEs > $storagedir/$computer/$sfilesystem/.date
226 # Check if we want a full backup - Debug statement that causes noise in cron mail:
227 # printf " $computer $filesystem: $confdir/fastfullbackupdag.$computer.$sfilesystem\n"
228 if [ -f $confdir/fastfullbackupdag.$computer.$sfilesystem ]; then
229 fullbackup_min_for_this_machine=$dagermellomfulleforfast
230 if [ "$DAY_OF_MONTH" = "`cat $confdir/fastfullbackupdag.$computer.$sfilesystem`" ]; then
233 elif [ -f $confdir/fastfullbackupdag.$computer ]; then
234 fullbackup_min_for_this_machine=$dagermellomfulleforfast
235 if [ "$DAY_OF_MONTH" = "`cat $confdir/fastfullbackupdag.$computer`" ]; then
239 fullbackup_min_for_this_machine=$dagermellomfulle
242 if [ -z "`find $storagedir/$computer/$sfilesystem/full/ -name \*tgz -mtime -$fullbackup_min_for_this_machine`" ]; then
247 cd $storagedir/$computer/$sfilesystem/$backuplevel || die
249 # Perform the actual backup
252 # Check if this box has a custom number of full backups
253 if [ -f $confdir/maksfulle.$computer ] ; then
254 mf=$((`cat $confdir/maksfulle.$computer`+1))
256 mf=$(($maksantallfulle+1))
259 # Delete old full backups
260 for full in `ls -1t $storagedir/$computer/$sfilesystem/full/*tgz | tail -n +$mf`
262 prefix=`echo $full | sed "s/\.[^.]*$//"`
263 echo `date`": $computer:$filesystem Deleting full backup $prefix" >&2
267 # Delete incremental backups older than the oldest full backup
268 oldf=`ls -t1 $storagedir/$computer/$sfilesystem/full/*tgz | tail -1`
270 $storagedir/$computer/$sfilesystem/daglig \
273 -printf "`date`: $computer: Deleting old incremental backup: %p\n" \
277 # Try to run postexec if it exist
278 if ! ssh root@$computer "[ ! -f ~/.backup/postexec ] || /bin/bash -x ~/.backup/postexec" >&2; then
279 echo `date`" $computer: Could not run $computer:~/.backup/postexec"