ebs

import boto3
import collections
import datetime

ec = boto3.client('ec2', region_name='eu-west-1')

#begins lambda function
def lambda_handler(event, context):
# mention your tag values below example "Backup-snap"
reservations = ec.describe_instances(
Filters=[
{'Name': 'tag:Backup', 'Values': ['True']},
]
).get(
'Reservations', []
)
instances = sum(
[
[i for i in r['Instances']]
for r in reservations
], [])

print "Number of the Instances : %d" % len(instances)

to_tag = collections.defaultdict(list)

for instance in instances:
try:
retention_days = [
int(t.get('Value')) for t in instance['Tags']
if t['Key'] == 'Retention'][0]
except IndexError:
# Please give your retention period day
retention_days = 3

for dev in instance['BlockDeviceMappings']:
if dev.get('Ebs', None) is None:
continue
vol_id = dev['Ebs']['VolumeId']
for name in instance['Tags']:
# To store the instance tag value
Instancename= name['Value']
# To store the instance key value
key= name['Key']
# Below the code is create Snapshot name as instance Name
if key == 'Name' :
ins_name = Instancename
print "Found EBS volume %s on instance %s" % (
vol_id, instance['InstanceId'])

#To get all the instance tags deatils
for name in instance['Tags']:
# To store the instance tag value
Instancename= name['Value']
# To store the instance key value
key= name['Key']
# Below the code is create Snapshot name as instance Name
if key == 'Name' :
snap = ec.create_snapshot(
VolumeId=vol_id,
Description=Instancename,
)
print "snap %s" %snap

to_tag[retention_days].append(snap['SnapshotId'])

print "Retaining snapshot %s of volume %s from instance %s for
%d days" % (
snap['SnapshotId'],
vol_id,
instance['InstanceId'],
retention_days,

)
for retention_days in to_tag.keys():
delete_date = datetime.date.today() +
datetime.timedelta(days=retention_days)
snap = snap['Description'] + str('_')
# Here to get current date
snapshot = snap + str(datetime.date.today())
# to mention the current date formet
delete_fmt = delete_date.strftime('%Y-%m-%d')
print "Will delete %d snapshots on %s" %
(len(to_tag[retention_days]), delete_fmt)
# below code is create the name and current date as
instance name
ec.create_tags(
Resources=to_tag[retention_days],
Tags=[
{'Key': 'DeleteOn', 'Value': delete_fmt},
{'Key': 'Name', 'Value': snapshot },
]
)
to_tag.clear()