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:
- Let's develop our app:
hello-world-flask.py
#!/usr/bin/env python3 from flask import Flask app = 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-initto install Python and Flask, pull the code from S3, create a SystemD unit, and start a service that...