Overnight shutdown module

About#

To save cost on running EC2 Instances in Dev and Staging environments, there's a need to power down instances during Out of Office hours (19:00-7:00 Monday-Friday and Saturday and Sunday). This account-wide code seeks to address this.

What it does#

1) Creates an IAM policy that allows the following actions:

  • a) Stop an EC2 Instance
  • b) Start an EC2 Instance
  • c) List EC2 Instance in the AWS accounnt 2) Creates an IAM role to stop/start the Instance. Attached to this role is the policy defined in step 1 above 3) Defines a Lambda function that handles the stop/start of the Instance. This uses a Python script (boto3). The script uses AWS tags to identify the Instance. Any EC2 Instance with a tag OOOShutdown with true value will be stopped/started at the time defined within the Cloudwatch rules 4) Defines Cloudwatch rules and grants permission to trigger the execution of the Lambda function at the following times:
  • Stop EC2 at 7pm
  • Start EC2 at 7am

How can I use it?#

Ensure your instance has a tag OOOShutdown with a value of true.

TODO#

Possibly extend this to RDS Instances

The module for overnight shutdown can be found here: https://github.com/LBHackney-IT/infrastructure/tree/master/platform/instance-scheduler

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