sample basic docker-compose.yml

ReadMe.md

Docker Compose Getting Started

Built from the "getting started" guide on docs.docker.com: https://docs.docker.com/compose/gettingstarted/

Required

1. Docker
2. Docker Compose (should come with Docker CE for macOS and Windows, if you're using toolbox, install it)

Adapted

Adapted from the original docker compose getting started guide to use Node w/ the Express framework in place of python.

Create from Scratch

1. Create Docker image, build Dockerfile
2. Build the image, docker build -t web .
3. Define services, port bindings, in docker-compose.yml
4. Build and run w/ compose, docker-compose up (add -d for it to run 'detatched', in background)

* To remove the container(s) defined by the docker-compose.yml, run docker-compose rm from cwd.

Clone and Run

1. git clone https://github.com/edm00se/simple-docker-compose-node-redis-demo.git
2. cd simple-docker-compose-node-redis-demo
3. docker-compose up (first time run will perform build, can force a fresh build with --build)
4. (optional) observe magic via Kitematic

License

The MIT License (MIT).

app.js

const express = require('express');
const app = express();
const session = require('express-session');
const RedisStore = require('connect-redis')(session);

const options = {
  host: 'redis',
  port: 6379,
  logErrors: true
};

app.use(
  session({
    store: new RedisStore(options),
    secret: 'amazing stuff',
    resave: true,
    saveUninitialized: true
  })
);

RedisStore['hits'] = 0;

app.get('/', (req, res) => {
  RedisStore['hits']++;
  const num = RedisStore['hits'];
  res.send(`Hello World!<br><p>I have been loaded ${num} times.</p>`);
});

app.listen(3000, () => {
  console.log('Example app listening on port 3000!');
});

docker-compose.yml

version: '3.1'
services:
  web:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
     - "3000:3000"
    volumes:
     - .:/app
    depends_on:
     - redis
  redis:
    image: redis:alpine

Dockerfile

FROM node:alpine
RUN mkdir -p /code
COPY . /code
WORKDIR /code
RUN npm install
CMD ["npm", "start"]

package.json

{
    "name": "simple-docker-compose-node-redis-demo",
    "version": "1.0.0",
    "description": "simple hello world, with a configured redis db in Docker compose",
    "main": "app.js",
    "scripts": {
        "test": "echo \"Error: no test specified\" && exit 1",
        "start": "node app.js"
    },
    "repository": {
        "type": "git",
        "url": "git+ssh://git@github.com:edm00se/simple-docker-compose-node-redis-demo.git"
    },
    "author": "Eric McCormick (https://github.com/edm00se)",
    "license": "MIT",
    "homepage": "https://github.com/edm00se/simple-docker-compose-node-redis-demo#readme",
    "dependencies": {
        "connect-redis": "3.3.0",
        "express": "4.15.3",
        "express-session": "1.15.4"
    }
}