Docker Images to Heroku

Hey Devs,

So I was wondering how to push my docker image to Heroku.
Turns out it wasn't that hard.
Below is a walk-through of what I did.

So for the starters, I created an express app.

mkdir express-docker-up
cd express-docker-up
git init
npm init -y
npm install --save express

Never forget the .gitignore file to keep the node_modules folder out of you git history. (If the your machine's node_modules get cloned to a different machine, errors may dial in)

/node_modules/

add the index.js

const express = require('express')
const app = express()
const port = process.env.PORT

app.get('/', (req, res) => res.send('Hello World!'))

app.listen(port, () => console.log(`Example app listening on port ${port}!`))

Create the Dockerfile

FROM node:10-alpine
WORKDIR /app
COPY package.json .
RUN npm install
COPY index.js .
CMD ["node", "index.js"]

Create the heroku.yml

build:
    docker:
      web: Dockerfile

Let's start working on heroku now

heroku login

If you don't have a pre-made app, create one

heroku create

Set the stack as container for the app

heroku stack:set container --app APP_NAME

now to commit and push

git add .
git commit

Don't forget to give a meaningful commit message
Check if heroku is present in your remote

git remote

If not, make sure you have the heroku remote set

git remote set heroku <heroku git repo(check your app settings on the web)>

OR

heroku git:remote --app APP_NAME

And now push

git push heroku master

Now you wait, and when it's done, just go to the app url.
Voila!

I've uploaded this code to my github