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.
24 # The computer to backup.
28 LOCKFILE=/home/backup/backuprun.lockfile.$computer
29 confdir=/home/backup/conf/ # Configuration files
30 storagedir=/backup # Where we keep backups
31 maksantallfulle=3 # Number of full backups
32 dagermellomfulle=30 # Days between full backups
33 dagermellomfulleforfast=32 # Days between full backups for machines with fixed
34 # full-backup date (in case the fixed day gets missed)
35 DAY_OF_MONTH=`date "+%d" | sed s/^0//` # from 1 to 31
36 DATE=`date "+%Y%m%d%H%M"` #format: touch
37 DATEs=`date "+%Y-%m-%d %H:%M"` #format: tar
40 exclude=$confdir/exclude
41 [ ! -f $exclude ] && printf "tmp\ncore\n" > $exclude
43 if [ -z "$computer" ]; then
44 echo "Usage: $0 COMPUTER"
48 # Die more or less gracefully (at least notify user)
50 echo `date`": Something nasty happened. Ending, and not deleting lockfile $LOCKFILE."
55 trap die SIGINT SIGTERM
57 # Don't start if we're already running
58 if [ -e $LOCKFILE ]; then
59 echo `date`": $LOCKFILE exists for pid `cat $LOCKFILE`, exiting."
60 echo `date`": $LOCKFILE exists for pid `cat $LOCKFILE`, exiting." >&2
66 echo `date`": Backup run starting" >&2
72 # krever at noen variabler er satt
73 # krever at vi er i rett katalog
78 printf " $computer: $computer:$filesystem $backuplevel backup\n" >&2
80 if [ "$backuplevel" = "daglig" ] || [ "$backuplevel" = "incremental" ]
83 lastcmd="--newer='$lastd'"
88 # expand the exclude-path for use with tar
89 exf=`ssh root@$computer "ls ~/.backup/exclude"`
91 # We try to run tar on the remote computer
93 # C change to directory first
94 # . where to start taring (see C)
95 # $lastcmd only files newer than this
96 # --one-file-system don't traverse file systems
97 # --use-compress-program compress it using gzip or pigz
98 # --exclude-from file to get exclusion pattern from
99 # Pipe the stuff over ssh to ourselves, run pee to cat the contents to a
100 # file and build a file list, respectivly.
102 TARCMD="ssh root@$computer \"nice -n 19 ionice -c3 tar --one-file-system --use-compress-program $compressor -cf - -C $filesystem . $lastcmd \
103 --exclude-from=$exf\" | pee \"cat > $TARFILE\" \"tar tzvf -\""
104 echo `date`" $computer: Running $TARCMD" >&2
105 eval $TARCMD > $DATE.idx
107 if [ $? -eq 0 ] && [ -s $TARFILE ]; then
108 # File is >0 in size and neither cat or tar tzvf failed; we assume it worked.
110 # Move tar file in place
111 mv $TARFILE $DATE.tgz
114 echo $DATEs > ../.date && touch -t $DATE ../.date
116 # Make a sorted filelist as well
117 sort -k6 < $DATE.idx > $DATE.sdx
120 chmod 600 *tgz #only for us
121 chmod 644 *sdx *idx 2>/dev/null #everyone can read
123 # Let the remote computer know that we ran a successful backup (for nagios)
124 ssh root@$computer touch $filesystem/.lastbackup
127 # Something wrong happened.
129 echo `date`" $computer: $TARFILE empty. $backuplevel backup of $computer:$filesystem failed and deleted"
131 # We don't want to return 0
137 # Check that the target filesystem is mounted (actually check that it's not
138 # the root filesystem)
139 if [ ! -d "$storagedir/$computer" ]; then
140 echo `date`" $computer: Target filesystem ($storagedir/$computer) does not exist. Aborting"
143 rootfilesystem=`df -P /`
144 targetfilesystem=`df -P "$storagedir/$computer"`
145 if [ "$rootfilesystem" == "$targetfilesystem" ]; then
146 echo `date`" $computer: Target filesystem ($storagedir/$computer) was mounted on /. Aborting"
150 echo `date`" $computer: Backing up $computer" >&2
152 # Try to SSH to the computer without entering a password.
153 if ! `ssh -n -o NumberOfPasswordPrompts=0 root@$computer /bin/true`; then
154 echo `date`" $computer: Could not use passwordless SSH."
156 # We don't want to return 0
160 # Check if pigz is available
161 if ssh -n root@$computer "pigz -V 2>/dev/null"; then
164 echo `date`" $computer: pigz missing; falling back to gzip."
170 # Check dump bit in fstab
171 filesystems=`ssh -n root@$computer "cat /etc/fstab" \
175 | awk '{ if ( $(NF-1) != "0" ) print $2}' `
177 # Clean up our dir at this client
178 if ! ssh root@$computer "rm -r ~/.backup ; mkdir -m 700 ~/.backup"; then
179 echo `date`" $computer: Could not create backup staging area at $computer:~/.backup - skipping backup of $computer"
183 # Try to copy $exclude to $computer
184 if ! scp $exclude root@$computer:~/.backup/exclude > /dev/null; then
185 echo `date`" $computer: Could not copy exclude.txt to $computer - skipping backup of $computer"
189 # Try to copy preeexec and postexec if they exist
190 if [ -f $confdir/preexec.$computer ]; then
191 if ! scp $confdir/preexec.$computer root@$computer:~/.backup/preexec >&2; then
192 echo `date`" $computer: Could not copy preexec.$computer to $computer:~/.backup/preexec - skipping backup of $computer"
196 if [ -f $confdir/postexec.$computer ]; then
197 if ! scp $confdir/postexec.$computer root@$computer:~/.backup/postexec >&2; then
198 echo `date`" $computer: Could not copy postexec.$computer to $computer:~/.backup/postexec - skipping backup of $computer"
203 # Try to run preexec if it exist
204 if ! ssh root@$computer "[ ! -f ~/.backup/preexec ] || /bin/bash -x ~/.backup/preexec" >&2; then
205 echo `date`" $computer: Could not run $computer:~/.backup/preexec - skipping backup of $computer"
210 for filesystem in $filesystems
212 # Remove / and $ (for Windows) for path names
213 sfilesystem=`echo $filesystem | tr '\/\$' '__'`
215 # Prepare storage area
216 mkdir -m 755 -p $storagedir/$computer/$sfilesystem/full 2>/dev/null
217 mkdir -m 755 -p $storagedir/$computer/$sfilesystem/daglig 2>/dev/null
218 echo $filesystem > ${storagedir}/${computer}/.${sfilesystem}.name
219 chmod 644 ${storagedir}/${computer}/.${sfilesystem}.name
221 # Default backuplevel
224 if [ ! -f $storagedir/$computer/$sfilesystem/.date ]
226 # Take the first full backup of this filesystem on this computer
228 echo $DATEs > $storagedir/$computer/$sfilesystem/.date
231 # Check if we want a full backup - Debug statement that causes noise in cron mail:
232 # printf " $computer $filesystem: $confdir/fastfullbackupdag.$computer.$sfilesystem\n"
233 if [ -f $confdir/fastfullbackupdag.$computer.$sfilesystem ]; then
234 fullbackup_min_for_this_machine=$dagermellomfulleforfast
235 if [ "$DAY_OF_MONTH" = "`cat $confdir/fastfullbackupdag.$computer.$sfilesystem`" ]; then
238 elif [ -f $confdir/fastfullbackupdag.$computer ]; then
239 fullbackup_min_for_this_machine=$dagermellomfulleforfast
240 if [ "$DAY_OF_MONTH" = "`cat $confdir/fastfullbackupdag.$computer`" ]; then
244 fullbackup_min_for_this_machine=$dagermellomfulle
247 if [ -z "`find $storagedir/$computer/$sfilesystem/full/ -name \*tgz -mtime -$fullbackup_min_for_this_machine`" ]; then
252 cd $storagedir/$computer/$sfilesystem/$backuplevel || die
254 # Perform the actual backup
257 # Check if this box has a custom number of full backups
258 if [ -f $confdir/maksfulle.$computer ] ; then
259 mf=$((`cat $confdir/maksfulle.$computer`+1))
261 mf=$(($maksantallfulle+1))
264 # Delete old full backups
265 for full in `ls -1t $storagedir/$computer/$sfilesystem/full/*tgz | tail -n +$mf`
267 prefix=`echo $full | sed "s/\.[^.]*$//"`
268 echo `date`": $computer:$filesystem Deleting full backup $prefix" >&2
272 # Delete incremental backups older than the oldest full backup
273 oldf=`ls -t1 $storagedir/$computer/$sfilesystem/full/*tgz | tail -1`
275 $storagedir/$computer/$sfilesystem/daglig \
278 -printf "`date`: $computer: Deleting old incremental backup: %p\n" \
282 # Try to run postexec if it exist
283 if ! ssh root@$computer "[ ! -f ~/.backup/postexec ] || /bin/bash -x ~/.backup/postexec" >&2; then
284 echo `date`" $computer: Could not run $computer:~/.backup/postexec"