aws-autosnap.py

#/usr/bin/python

#
# AWS auto snapshot script - 2013-08-17
# https://github.com/viyh/aws-scripts
#
# cron script to snapshot all EC2 volumes and delete snapshots older than retention time
#

import boto
import datetime

# number of days to retain snapshots for
retention_days = 2

# AWS access/secret keys
aws_access = None
aws_secret = None

######

print("AWS snapshot backups stated at %s...\n" % datetime.datetime.now())

ec2 = boto.connect_ec2(aws_access_key_id=aws_access, aws_secret_access_key=aws_secret)

reservations = ec2.get_all_instances(filters={'instance-state-name': 'running'})

# look through each instance for EBS volumes
for i in [i for r in reservations for i in r.instances]:

    print("%s - %s" % (i.tags.get('Name'), i.id))

    # loop through volumes and create snapshots
    for v in ec2.get_all_volumes(filters={'attachment.instance-id': i.id}):
        print("\t%s" % v.id)
        description = 'autosnap-%s.%s-%s' % ( i.tags.get('Name'), v.id, datetime.datetime.now().strftime("%Y%m%d-%H%M%S") )

        # create snapshot
        if v.create_snapshot(description):
            print("\t\tSnapshot created with description [%s]" % description)

        # find and delete snapshots older than retention_days
        for s in v.snapshots():
            print("\t\tsnapshot found: [%s - %s] created [%s]" % ( s.id, s.description, str( boto.utils.parse_ts(s.start_time) ) ))
            if not s.description.startswith('autosnap-') or ( datetime.datetime.now() - boto.utils.parse_ts(s.start_time) ) <= datetime.timedelta(days=retention_days):
                continue

            print("\t\tDeleting snapshot [%s - %s]" % ( s.id, s.description ))
            try:
                s.delete()
                print("yep.")
            except EC2ResponseError as e:
                print("%s" % str(e))

print("\n\nAWS snapshot backups completed at %s\n" % datetime.datetime.now())