Amazon EC2 EBS Backup

readme

Simple python script to take snapshots of ebs volumes daily/monthly and allow delete expired (10 days for daily, 120 days for monthly)

Ex:

python snapshot.py -m [daily|monthly] -v [vol-XXXXXX] -d 'description'

snapshot.py

#!/usr/bin/env python
# 2010-12-2, murat@invokemedia.com

import boto.ec2
import os, sys
from optparse import OptionParser
from datetime import datetime, timedelta

aws_access_key_id = ''
aws_secret_access_key = ''
region = 'us-east-1'

class SnapshotManager:
        def __init__(self, _aws_access_key_id, _aws_secret_access_key, region='us-east-1'):
                os.environ['AWS_ACCESS_KEY_ID'] = _aws_access_key_id
                os.environ['AWS_SECRET_ACCESS_KEY'] = _aws_secret_access_key
                self.region = region
                self.ec2 = boto.ec2.connect_to_region(self.region)

        def parse_date(self, snapshot_date):
                # date format: 2010-01-30T16:55:03.000Z
                return datetime.strptime(snapshot_date, "%Y-%m-%dT%H:%M:%S.000Z")

        def check_volume_exists(self, volume_id):
                try:
                        self.ec2.get_all_volumes(volume_id)
                        return True
                except Exception:
                        return False

        def get_snapshots_for_volume(self, volume_id):
                snapshots_by_volume = []
                for snapshot in self.ec2.get_all_snapshots():
                        if(snapshot.volume_id==volume_id):
                                snapshots_by_volume.append(snapshot)
                return snapshots_by_volume

        def delete_expired(self, rotate_volume_id):
                num_deleted = 0
                for snapshot in self.get_snapshots_for_volume(rotate_volume_id):
                        snap_time = self.parse_date(snapshot.start_time)
                        current_time = datetime.now()
                        if "(daily)" in snapshot.description:
                                if snap_time < current_time - timedelta(days=10): # snapshot older than 10 days
                                        self.ec2.delete_snapshot(snapshot.id)
                                        num_deleted += 1
                        if "(monthly)" in snapshot.description:
                                if snap_time < current_time - timedelta(days=120): # snapshot 4 months or older
                                        self.ec2.delete_snapshot(snapshot.id)
                                        num_deleted += 1
                return num_deleted

        def create_daily_snapshot(self, volume_id, description):
                return self.ec2.create_snapshot(volume_id, "(daily) "+description)

        def create_monthly_snapshot(self, volume_id, description):
                return self.ec2.create_snapshot(volume_id, "(monthly) "+description)


if __name__ == "__main__":
        parser = OptionParser(description='Amazon EBS volume snapshot rotations. This script has three use cases: take daily snapshot, take monthly snapshot, and remove expired snapshots (rotate).')
        parser.add_option('-m', '--snapshot-mode', dest='mode', help="Set the snapshot to be created as 'daily' or 'monthly'.")
        parser.add_option('-v', '--volume', dest='volume', help='EBS Volume id (e.g. vol-995849f2)')
        parser.add_option('--delete', dest='delete', action='store_true', help='Delete expired snapshots')
        parser.add_option('-d', '--description', dest='description', help='Snapshot description')
        (options, args) = parser.parse_args()

        print "----- " + __file__ + " " + datetime.now().strftime("%Y-%m-%d, %H:%M:%S") + " ----- use option [-h] for help"
        sm = SnapshotManager(aws_access_key_id, aws_secret_access_key, region)

        description = options.description
        if options.volume:
                volume_id = options.volume
                if not sm.check_volume_exists(volume_id):
                        print "Volume ID " + volume_id + " does not exist in your account. (region: " + sm.region + ")"
                        sys.exit(-1)
                else:
                        print "Using volume "+volume_id
        if options.mode:
                if not description:
                        print "Please enter a description [-d]"
                        sys.exit(-1)
                mode = options.mode
                if mode == 'daily':
                        daily_snapshot = sm.create_daily_snapshot(volume_id, description)
                        if daily_snapshot:
                                print "Created new daily snapshot: " + daily_snapshot.id + " (" + description + ")"
                        else:
                                print "Failed to create daily snapshot for volume " + volume_id
                elif mode == 'monthly':
                        monthly_snapshot = sm.create_monthly_snapshot(volume_id, description)
                        if monthly_snapshot:
                                print "Created new monthly snapshot: " + monthly_snapshot.id + " (" + description + ")"
                        else:
                                print "Failed to create monthly snapshot for volume " + volume_id
                else:
                        print "Snapshot mode must be set to 'daily' or 'monthly'."
                        sys.exit(-1)
        if options.delete:
                num_deleted = sm.delete_expired(volume_id)
                print "Deleted {0} snapshots during rotation".format(num_deleted)