# Snap_and_Tag Lambda function
#
# This function is triggered when Auto Scaling launches a new instance.
# A snapshot of EBS volumes will be created and a tag will be added.
from __future__ import print_function
import json, boto3
def lambda_handler(event, context):
print("Received event: " + json.dumps(event, indent=2))
# Extract the EC2 instance ID from the Auto Scaling event notification
message = event['Records'][0]['Sns']['Message']
autoscalingInfo = json.loads(message)
ec2InstanceId = autoscalingInfo['EC2InstanceId']
# Snapshot all EBS volumes attached to the instance
ec2 = boto3.resource('ec2')
for v in ec2.volumes.filter(Filters=[{'Name': 'attachment.instance-id', 'Values':
[ec2InstanceId]}]):
description = 'Autosnap-%s-%s' % ( ec2InstanceId, v.volume_id )
if v.create_snapshot(Description = description):
print("\t\tSnapshot created with description [%s]" % description)
# Add a tag to the EC2 instance: Key = Snapshots, Value = Created
ec2 = boto3.client('ec2')
response = ec2.create_tags(
Resources=[ec2InstanceId],
Tags=[{'Key': 'Snapshots', 'Value': 'Created'}]
)
print ("***Tag added to EC2 instance with id: " + ec2InstanceId)
# Finished!
return ec2InstanceId
