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Script to create full/incremental backups with xtrabackup.
#!/bin/sh
TMPFILE="/tmp/xtrabackup-runner.$$.tmp"
USEROPTIONS="--user=${MYSQL_USER} --password=${MYSQL_PASSWORD} --host=${MYSQL_HOST}"
BACKDIR=/srv/mysql-bak
BASEBACKDIR=$BACKDIR/base
INCRBACKDIR=$BACKDIR/incr
FULLBACKUPCYCLE=604800 # Create a new full backup every X seconds
KEEP=1 # Number of additional backups cycles a backup should kept for.
START=`date +%s`
echo "----------------------------"
echo
echo " run-xtrabackup.sh: MySQL backup script"
echo "started: `date`"
echo
if test ! -d $BASEBACKDIR
then
mkdir -p $BASEBACKDIR
fi
# Check base dir exists and is writable
if test ! -d $BASEBACKDIR -o ! -w $BASEBACKDIR
then
error
echo $BASEBACKDIR 'does not exist or is not writable'; echo
exit 1
fi
if test ! -d $INCRBACKDIR
then
mkdir -p $INCRBACKDIR
fi
# check incr dir exists and is writable
if test ! -d $INCRBACKDIR -o ! -w $INCRBACKDIR
then
error
echo $INCRBACKDIR 'does not exist or is not writable'; echo
exit 1
fi
if [ -z "`mysqladmin $USEROPTIONS status | grep 'Uptime'`" ]
then
echo "HALTED: MySQL does not appear to be running."; echo
exit 1
fi
if ! `echo 'exit' | /usr/bin/mysql -s $USEROPTIONS`
then
echo "HALTED: Supplied mysql username or password appears to be incorrect (not copied here for security, see script)"; echo
exit 1
fi
echo "Check completed OK"
# Find latest backup directory
LATEST=`find $BASEBACKDIR -mindepth 1 -maxdepth 1 -type d -printf "%P\n" | sort -nr | head -1`
AGE=`stat -c %Y $BASEBACKDIR/$LATEST`
if [ "$LATEST" -a `expr $AGE + $FULLBACKUPCYCLE + 5` -ge $START ]
then
echo 'New incremental backup'
# Create an incremental backup
# Check incr sub dir exists
# try to create if not
if test ! -d $INCRBACKDIR/$LATEST
then
mkdir -p $INCRBACKDIR/$LATEST
fi
# Check incr sub dir exists and is writable
if test ! -d $INCRBACKDIR/$LATEST -o ! -w $INCRBACKDIR/$LATEST
then
echo $INCRBACKDIR/$LATEST 'does not exist or is not writable'
exit 1
fi
LATESTINCR=`find $INCRBACKDIR/$LATEST -mindepth 1 -maxdepth 1 -type d | sort -nr | head -1`
if [ ! $LATESTINCR ]
then
# This is the first incremental backup
INCRBASEDIR=$BASEBACKDIR/$LATEST
else
# This is a 2+ incremental backup
INCRBASEDIR=$LATESTINCR
fi
TARGETDIR=$INCRBACKDIR/$LATEST/`date +%F_%H-%M-%S`
# Create incremental Backup
xtrabackup --backup $USEROPTIONS --target-dir=$TARGETDIR --incremental-basedir=$INCRBASEDIR > $TMPFILE 2>&1
else
echo 'New full backup'
TARGETDIR=$BASEBACKDIR/`date +%F_%H-%M-%S`
# Create a new full backup
xtrabackup --backup $USEROPTIONS --target-dir=$TARGETDIR > $TMPFILE 2>&1
fi
if [ -z "`tail -1 $TMPFILE | grep 'completed OK!'`" ]
then
echo "xtrabackup failed:"; echo
echo "---------- ERROR OUTPUT from xtrabackup ----------"
cat $TMPFILE
rm -f $TMPFILE
exit 1
fi
THISBACKUP=`awk -- "/Backup created in directory/ { split( \\\$0, p, \"'\" ) ; print p[2] }" $TMPFILE`
echo "Databases backed up successfully to: $THISBACKUP"
echo
MINS=$(($FULLBACKUPCYCLE * ($KEEP + 1 ) / 60))
echo "Cleaning up old backups (older than $MINS minutes) and temporary files"
# Delete tmp file
rm -f $TMPFILE
# Delete old bakcups
for DEL in `find $BASEBACKDIR -mindepth 1 -maxdepth 1 -type d -mmin +$MINS -printf "%P\n"`
do
echo "deleting $DEL"
rm -rf $BASEBACKDIR/$DEL
rm -rf $INCRBACKDIR/$DEL
done
SPENT=$(((`date +%s` - $START) / 60))
echo
echo "took $SPENT minutes"
echo "completed: `date`"
exit 0
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