Merge pull request #60 from bcachet/tarsnap

add(tarsnap): Script to rotate backups

roles/tarsnap/files/tarsnap.sh

@@ -0,0 +1,91 @@
+#!/bin/sh
+
+# Tarsnap backup script
+# Written by Tim Bishop, 2009.
+
+# Directories to backup
+DIRS="/home /root /decrypted /var/www /var/lib/mysql"
+
+# Number of daily backups to keep
+DAILY=7
+
+# Number of weekly backups to keep
+WEEKLY=3
+# Which day to do weekly backups on
+# 1-7, Monday = 1
+WEEKLY_DAY=5
+
+# Number of monthly backups to keep
+MONTHLY=1
+# Which day to do monthly backups on
+# 01-31 (leading 0 is important)
+MONTHLY_DAY=01
+
+# Path to tarsnap
+#TARSNAP="/home/tdb/tarsnap/tarsnap.pl"
+TARSNAP="/usr/local/bin/tarsnap"
+
+# end of config
+
+# day of week: 1-7, monday = 1
+DOW=`date +%u`
+# day of month: 01-31
+DOM=`date +%d`
+# month of year: 01-12
+MOY=`date +%m`
+# year
+YEAR=`date +%Y`
+# time
+TIME=`date +%H%M%S`
+
+# Backup name
+if [ X"$DOM" = X"$MONTHLY_DAY" ]; then
+	# monthly backup
+	BACKUP="$YEAR$MOY$DOM-$TIME-monthly"
+elif [ X"$DOW" = X"$WEEKLY_DAY" ]; then
+	# weekly backup
+	BACKUP="$YEAR$MOY$DOM-$TIME-weekly"
+else
+	# daily backup
+	BACKUP="$YEAR$MOY$DOM-$TIME-daily"
+fi
+
+# Do backups
+for dir in $DIRS; do
+	# nasty bodge for my large /home :-)
+	EXTRA_FLAGS=
+	if [ X"$dir" = X"/home" ]; then
+		EXTRA_FLAGS="--lowmem"
+	fi
+
+	echo "==> create $BACKUP-$dir"
+	$TARSNAP $EXTRA_FLAGS -c -f $BACKUP-$dir $dir
+done
+
+# Backups done, time for cleaning up old archives
+
+# using tail to find archives to delete, but its
+# +n syntax is out by one from what we want to do
+# (also +0 == +1, so we're safe :-)
+DAILY=`expr $DAILY + 1`
+WEEKLY=`expr $WEEKLY + 1`
+MONTHLY=`expr $MONTHLY + 1`
+
+# Do deletes
+TMPFILE=/tmp/tarsnap.archives.$$
+$TARSNAP --list-archives > $TMPFILE
+for dir in $DIRS; do
+	for i in `grep -E "^[[:digit:]]{8}-[[:digit:]]{6}-daily-$dir" $TMPFILE | sort -rn | tail -n +$DAILY`; do
+		echo "==> delete $i"
+		$TARSNAP -d -f $i
+	done
+	for i in `grep -E "^[[:digit:]]{8}-[[:digit:]]{6}-weekly-$dir" $TMPFILE | sort -rn | tail -n +$WEEKLY`; do
+		echo "==> delete $i"
+		$TARSNAP -d -f $i
+	done
+	for i in `grep -E "^[[:digit:]]{8}-[[:digit:]]{6}-monthly-$dir" $TMPFILE | sort -rn | tail -n +$MONTHLY`; do
+		echo "==> delete $i"
+		$TARSNAP -d -f $i
+	done
+done
+rm $TMPFILE

roles/tarsnap/files/tarsnaprc

@@ -0,0 +1,5 @@
+keyfile /root/tarsnap.key
+cachedir /usr/tarsnap-cache
+exclude /usr/tarsnap-cache
+humanize-numbers
+

roles/tarsnap/tasks/tarsnap.yml

@@ -24,5 +24,11 @@
 - name: Create Tarsnap cache directory
   file: state=directory path=/usr/tarsnap-cache
 
-- name: Install nightly Tarsnap cronjob
-  cron: name="Tarsnap backup" hour="3" minute="0" job="/usr/local/bin/tarsnap --cachedir /usr/tarsnap-cache --keyfile /root/tarsnap.key -c -f backup-`date +\%Y\%m\%d` -C / home root decrypted var/www var/log var/lib/mysql > /dev/null"
+- name: Install Tarsnap configuration file
+  copy: src=tarsnaprc dest=/root/.tarsnaprc mode="644"
+
+- name: Install Tarsnap backup handler script
+  copy: src=tarsnap.sh dest=/root/tarsnap.sh mode="755"
+
+- name: Install nightly Tarsnap-generations cronjob
+  cron: name="Tarsnap backup" hour="23" minute="0" job="sh /root/tarsnap.sh >> /var/log/tarsnap.log"