Deploying your application to EC2 during stack creation

In this section, we will get hands-on experience with cfn-init by using it to bootstrap an application on EC2 instances.

We will begin with a simple “Hello, World!” example.

Creating a “Hello, World!” application

We’ll start by implementing a basic “Hello, World!” application, which is going to be deployed in an AutoScaling group. This is going to be an application based on Flask—a lightweight Python web framework:

1. Let’s develop our app:

   // hello-world-flask.py#!/usr/bin/env python3from flask import Flaskapp = Flask(__name__)@app.route("/")def hello():    return «Hello, World, from AWS!"if __name__ == "__main__":    app.run(host="0.0.0.0", port=80)

   Nothing really serious. We will store this application on S3 and use cfn-init to install Python and Flask, pull the code from...