00-heroku.md

Heroku Experience

Let's start with a Hello World application deployed on Heroku to see the experience we're trying to build.

Create a new folder with two files.

mkdir -p /tmp/heroku-test

Content of /tmp/heroku-test/package.json

{
  "name": "hello-world",
  "version": "1.0.0",
  "description": "Kubecon NA 2022 - Cloud Native Heroku",
  "author": "First Last <[email protected]>",
  "main": "server.js",
  "scripts": {
    "start": "node server.js"
  }
}

Content of /tmp/heroku-test/server.js

const http = require('http');
const port = process.env.PORT || 8080

const requestListener = function (req, res) {
  res.writeHead(200);
  res.end('Hello World!');
}

const server = http.createServer(requestListener);
server.listen(port);

Initialize a git repo in the folder.

# We are in /tmp/heroku-test
git init
git add .
git commit -s -m "initial commit"

Go to https://heroku.com and create a new application. Let's name it kubecon-na-2022. It should give you a command to add a git remote and push your code.

heroku git:remote -a kubecon-na-2022
git push heroku main

You should see your server up and running when you visit your URL!

https://kubecon-na-2022.herokuapp.com/

If you want to add cloud infrastructure like a bucket, you need to add an addon and use the given environment variable in your application. However, you don't get to have it in your cloud account so how you can configure it is limited depending on which plugin you choose to use.

Let's see how we can build it in cloud native way! Jump to the next tutorial that will get you started.