Nodejs "Hello world"

Based on Dockerizing a Node.js web app For others version of the Node.js container used here, got to Docker Hub

Prepare your app

There must be a package.json file containing the start command. Your app needs to be able to start with the port set in an environment variable.

const express = require('express');
const PORT = process.env.NODE_PORT || 3000;
app.listen(PORT, HOST);

Start the container for development

docker run --name hello-node -v $(pwd):/usr/src/app -d wicastr/node:latest-onbuild

$ docker ps
CONTAINER ID        IMAGE                 COMMAND             CREATED             STATUS              PORTS                    NAMES
5df7d2377e5c        wicastr/node:latest-onbuild   "npm start"        1 minute ago         Up 1 minute          0.0.0.0:8080->80/tcp   hello-node

Go to localhost:8080 on your browser

Build

Once your app is ready Stop the development container and build docker stop hello-node docker build -t <your username>/hello-node .

$ docker images
REPOSITORY                      TAG        ID              CREATED
<your username>/hello-node    latest     d64d3505b0d2    1 minute ago

Test

docker run -p 8080:3000 -d <your username>/hello-node

$ docker ps
ID            IMAGE                                COMMAND    ...   PORTS
ecce33b30ebf  <your username>/hello-node  npm start ...   8080->3000

Go to localhost:8080 on your browser

Publish

Tag the image for WICASTR's registry

docker tag hub.wicastr.net/<your username>/hello-node

Push the image to the registry

docker push hub.wicastr.net/<your username>/hello-node