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A simple database backup / rotation / prune script
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#!/bin/bash | |
# Forked from gist bendavis78/db_backup.sh | |
# Added better logging so the script can be monitored | |
# for use with cron, eg: | |
# 0 3 * * * postgres /var/db/db_backup.sh foo_db | |
if [[ -z "$1" ]]; then | |
echo "Usage: $0 <db_name> [pg_dump args]" | |
exit 1 | |
fi | |
DB="$1"; shift | |
DUMP_ARGS=$@ | |
DIR="/var/db/backups/$DB" | |
KEEP_DAILY=7 | |
KEEP_WEEKLY=5 | |
KEEP_MONTHLY=12 | |
function rotate { | |
rotation=$1 | |
fdate=`date +%Y-%m-%d -d $date` | |
file=$DIR/daily/*$fdate*.gz | |
mkdir -p $DIR/$rotation/ || abort | |
if [ -f $file ]; then | |
cp $file $DIR/$rotation/ || abort | |
else | |
echo | |
fi | |
} | |
function prune { | |
dir=$DIR/$1 | |
keep=$2 | |
ls $dir | sort -rn | awk " NR > $keep" | while read f; do rm $dir/$f; done | |
} | |
function abort { | |
echo $date " aborting..." >> $DIR/logs/logfile | |
exit 1 | |
} | |
mkdir -p $DIR/daily || abort | |
mkdir -p $DIR/weekly || abort | |
mkdir -p $DIR/monthly || abort | |
mkdir -p $DIR/yearly || abort | |
mkdir -p $DIR/logs || abort | |
if [ ! -f "$DIR/logs/logfile" ] | |
then | |
touch $DIR/logs/logfile | |
fi | |
date=`date +%Y-%m-%d` || abort | |
day=`date -d $date +%d` || abort | |
weekday=`date -d $date +%w` || abort | |
month=`date -d $date +%m` || abort | |
# Do the daily backup | |
echo $date " Performing daily dump of " $DB >> $DIR/logs/logfile | |
/usr/bin/pg_dump $DB $DUMP_ARGS | gzip > $DIR/daily/${DB}_$date.sql.gz | |
test ${PIPESTATUS[0]} -eq 0 || abort | |
# Perform rotations | |
if [[ "$weekday" == "0" ]]; then | |
rotate weekly | |
fi | |
if [[ "$day" == "01" ]]; then | |
rotate monthly | |
fi | |
if [[ "$month/$day" == "01/01" ]]; then | |
rotate yearly | |
fi | |
prune daily $KEEP_DAILY | |
prune weekly $KEEP_WEEKLY | |
prune monthly $KEEP_MONTHLY | |
echo $date " Completed daily dump of " $DB >> $DIR/logs/logfile |
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