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# Automated AMI Backups
# @author Robert Kozora <> [I made some changes.]
# This script will search for all instances from all region and
# as soon as we have the instances list, we loop through each instance
# and create an AMI of it. Also, it will look for a "Retention" tag key which
# will be used as a retention policy number in days. If there is no tag with
# that name, it will use a 7 days default value for each AMI.
# After creating the AMI it creates a "DeleteOn" tag on the AMI indicating when
# it will be deleted using the Retention value and another Lambda function
import boto3
import collections
import datetime
import sys
import pprint
ec = boto3.client('ec2')
#image = ec.Image('id')
def lambda_handler(event, context):
reservations = ec.describe_instances(
'Reservations', []
instances = sum(
[i for i in r['Instances']]
for r in reservations
], [])
print "Found %d instances that need backing up" % len(instances)
to_tag = collections.defaultdict(list)
for instance in instances:
retention_days = [
int(t.get('Value')) for t in instance['Tags']
if t['Key'] == 'Retention'][0]
except IndexError:
retention_days = 3
#for dev in instance['BlockDeviceMappings']:
# if dev.get('Ebs', None) is None:
# continue
# vol_id = dev['Ebs']['VolumeId']
# print "Found EBS volume %s on instance %s" % (
# vol_id, instance['InstanceId'])
#snap = ec.create_snapshot(
# VolumeId=vol_id,
#create_image(instance_id, name, description=None, no_reboot=False, block_device_mapping=None, dry_run=False)
# DryRun, InstanceId, Name, Description, NoReboot, BlockDeviceMappings
create_time =
create_fmt = create_time.strftime('%Y-%m-%d--%H-%M-%S')
AMIid = ec.create_image(InstanceId=instance['InstanceId'], Name="Lambda - " + instance['InstanceId'] + " from " + create_fmt, Description="Lambda created AMI of instance " + instance['InstanceId'] + " from " + create_fmt, NoReboot=True, DryRun=False)
print "Retaining AMI %s of instance %s for %d days" % (
print to_tag.keys()
for retention_days in to_tag.keys():
delete_date = + datetime.timedelta(days=retention_days)
delete_fmt = delete_date.strftime('%m-%d-%Y')
print "Will delete %d AMIs on %s" % (len(to_tag[retention_days]), delete_fmt)
{'Key': 'DeleteOn', 'Value': delete_fmt},
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