Stops postgresql for tarsnap backup

Data loss will occur if backing up postgresql while it runs. A simple
fix is to stop it during the backup. I've moved the backup to early
morning to reduce possible downtime.

A better approach would be to use pg_dump.

roles/tarsnap/files/tarsnap.sh

 	BACKUP="$YEAR$MOY$DOM-$TIME-daily"
 fi
 
+# Stop postgres
+service postgresql stop
+
 # Do backups
 for dir in $DIRS; do
 	echo "==> create $BACKUP-$dir"
 	$TARSNAP $EXTRA_FLAGS -c -f $BACKUP-$dir $dir
 done
 
+# Start postgres
+service postgresql start
+
 # Backups done, time for cleaning up old archives
 
 # using tail to find archives to delete, but its

roles/tarsnap/tasks/tarsnap.yml

   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"
+  cron: name="Tarsnap backup" hour="3" minute="0" job="sh /root/tarsnap.sh >> /var/log/tarsnap.log"