bastiaanvanassche / tf-ec2-startstop

A Terraform module to temporarily stop and restart a pre-defined set of EC2 instances in AWS in order to reduce costs.

Module ec2-startstop

This module can be used to temporarily stop and restart a pre-defined set of EC2 instances in AWS in order to reduce costs. It can be configured with the following variables:

• ec2_instance_ids (mandatory): a list of EC2 instance IDs to start and stop.
• cron_expr_start: cron expression to trigger the start of the EC2 instances.
• cron_expr_stop: cron expression to trigger the stop of the EC2 instances.
• region: the region where the EC2 instances are located. This is an optional parameter. If no region variable is specified in the calling module, the aws_region data source is used to auto-determine the current region.

The code in the module is based on this article in the AWS user guide: https://aws.amazon.com/premiumsupport/knowledge-center/start-stop-lambda-cloudwatch/

Additional notes

Pre-commit hooks

This repository contains a .pre-commit-config.yaml file. This file includes a list of git pre-commit hooks that are handy during development. In order to activate the hooks, you need to install pre-commit package manager on your machine first (one-off action).

$ pip install pre-commit

Next you need to install the hooks listed in .pre-commit-config.yaml:

$ pre-commit install

pre-commit will now run on every commit. To manually run all hooks, you can issue

$ pre-commit run --all-files

More information about the yelp pre-commit framework can be found here

IMPORTANT: There's also one repository local hook present in .pre-commit-config.yaml with the name zip_py_scripts. It is responsible for archiving the lambda_xxx.py scripts in the ec2-startstop module. Please make sure this pre-commit hook is run before tagging the repo.