Documentation

As of majority cases, documentation is poor or missing.

Requirements:

• In order to get it working, EC2 should be tagged with backupEnabled tag which has value yes || Yes || YES

• retention tag should have integer value how long backups are preserved

• Create IAM policy and attach policy to Role. Policy must have next values:

• DescribeInstances

• CreateSnapshot

• CreateSnapshots

• CreateTags

• DescribeSnapshots

• DeleteSnapshot

Create Lambda:

• pick Author from scratch on right upper side
• give it a name
• and choose previously created role
• select Python 2.7 interpreter and paste ebsSnapshot.py content. Please, copy it from RAW page to be sure you will not have issues with execution.
• increase timeout to 3 mins
• add environment variables
• name: region
• value: eg. us-east-1
• only for ebsCleanup function add account_id environment variable with account id of your account
• click on Triggers
• add new trigger clicking on CloudWatch Events
• select schedule and set up cron expression, eg. 0 12 * * ? *

Repeat the process for deleting snapshots with DeleteOn flag.

Note:

Additionally, you can set SNS to send notification whenever Lambda reported an error. With CloudWatch you can create dashboard with Invocations, Duration, Throttles and Errors.