This project is aimed at outlining a small AWS project in which a simple NodeJS application is deployed to a Lambda function. An API Gateway will forward requests to the Lambda, which will then do a sanity check that it can access a Redis database in the private subnet. Additionally, it will check that it can initiate an HTTP request out to the public internet to verify the networking is correctly configured.

The application code that is deployed to Lambda lives in the ./app directory in the index.js file. Currently, this code does two checks:

• Test whether connections over the private AWS subnet are successful to talk to the Redis database
• Test whether public HTTP requests on the public internet can be initiated from the Lambda successfully

This repository is configured to use VSCode's devcontainer support to allow for local, containerized testing a development. Once VSCode has started the container, exectute the following commands on the container CLI to start Redis:

apt-get update
apt-get install redis
redis-server

In VSCode, you can now press F5 to launch the application or run cd app && npm start from a separate CLI window.

The infrastructure that manages the AWS Cloud Resources lives in the ./terraform directory. This infrastructure can be deployed in the Actions tab of the repository. If it is the first time the infrastructure is being provisioned, a dummy Hello World application will be deployed to AWS as a placeholder.

All subsequent infrastructure changes can be deployed in the same way.

This repository has two main ways to facilitate CI/CD built-in to GitHub-native workflows:

• Deploy Application: this workflow will package up the application code into a .zip file and deploy it to the running Lambda function via the AWS CLI
• Deploy Infrastructure: this workflow will utilize Terraform to apply the latest version of the infrastructure to the AWS Cloud