Lambda function for Route53 cleanup

Main logic is forked from fsalum/scripts, reworked a bit.

This Lambda will get the list of all HostedZones per account, iterate over them and clean up stale Route53 entries. The stale state is defined by:

• correlating IP addresses (private and public) of running EC2 instances with A entries in Route53
• correlating public and private DNS of EC2 intances with CNAME entries in Route53

USAGE (as Lambda):

1. Clone the repo
2. Initialize Virtualenv (highly advised)

virtualenv .

3. Install requirements

pip install -r requirements.txt

4. Put dependencies into deployment ZIP

cd ./lib/python2.7/site-packages
zip -ur10 ~/<path_to_zip>/<name.zip> *

5. Put main.py into deployment ZIP

zip -u ~/<path_to_zip>/<name.zip> main.py

6. Register Lambda function:

aws lambda create-function \
--region <aws_region> \
--function-name <lambda_function_name> \
--zip-file fileb://<path_to_zip>/<name.zip> \
--role arn:aws:iam:<role_name> \
--handler main.lambda_handler \
--runtime python2.7 \
--timeout 60 \
--memory-size 128 \
--profile <profile-name>

7. Additionally, I'd advise setting up CloudWatch event, that will trigger Lambda on schedule.

TODO: move to boto3 or better Golang.