Dockerでnginx + Node.js + MongoDBの環境を用意する

❯ docker -v                      
Docker version 20.10.10, build b485636

❯ docker-compose -v              
docker-compose version 1.29.2, build 5becea4c

.
├── docker-compose.yml
├── mongo
│   ├── init.js # DB初期化用スクリプト
│   └── mongo-data # データ保存用ディレクトリ（バインドマウント）
├── nginx
│   ├── Dockerfile
│   └── conf
│       └── proxy.conf
└── server
    ├── Dockerfile
    ├── node_modules
    ├── package-lock.json
    ├── package.json
    └── src # アプリケーションコード

  mongo:
    image: mongo
    container_name: mongo
    environment:
      MONGO_INITDB_DATABASE: admin
    volumes:
      - ./mongo/init.js:/docker-entrypoint-initdb.d/init.js:ro
      - ./mongo/mongo-data:/data/db
    # Start mongo with authentication enabled
    command: [mongod, --auth]

db.createUser({
  user: 'echizen',
  pwd: 'password',
  roles: [
    {
      role: 'readWrite',
      db: 'nginx-node-mongo-docker-example',
    },
  ],
})

npm init -y
npm install express
npm install mongodb

{
  "name": "server",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "express": "^4.17.3",
    "mongodb": "^4.5.0"
  }
}

import express from 'express'
import { MongoClient } from 'mongodb'

const PORT = 8080
const HOST = '0.0.0.0'

const app = express()

app.get('/', async (req, res) => {
  const result = await collection.find({}).toArray()
  res.json(result)
})

app.listen(8080, HOST, () => {
  console.log(`Listening on port ${PORT}`)
})

const URL = 'mongodb://echizen:password@mongo/nginx-node-mongo-docker-example?authSource=admin'
const client = new MongoClient(URL)

try {
  await client.connect()
  console.log('Succesfully connected to mongo')
} catch (e) {
  console.error(e)
}
const db = client.db()

// Prepare initial data
const doc1 = { name: 'Echizen', age: 24 }
const doc2 = { name: 'Bob', age: 32 }

const collection = db.collection('test-collection')
await collection.insertMany([doc1, doc2])

FROM node:16

# アプリケーションディレクトリを作成する
WORKDIR /usr/src/app

# キャッシュを利用するために、package.jsonとpackage-lock.jsonのみをコピーし、
# 依存関係を先にインストール
COPY package*.json ./
RUN npm install

# アプリケーションコードをコンテナにコピー
COPY . .

EXPOSE 8080
CMD [ "node", "src/app.js" ]

node_modules
npm-debug.log

server {
  listen 80;
  location / {
    proxy_pass http://server:8080/;
  }
}

FROM nginx:1.21

# デフォルトの設定を削除
RUN rm /etc/nginx/conf.d/default.conf

# 作成した設定ファイルをコピー
COPY conf/proxy.conf /etc/nginx/conf.d

services:
  nginx:
    build: ./nginx
    container_name: nginx
    depends_on:
      - server
    ports:
      - 8080:80

  server:
    build: ./server
    container_name: server
    depends_on:
      - mongo

  mongo:
    image: mongo
    container_name: mongo
    environment:
      MONGO_INITDB_DATABASE: admin
    volumes:
      - ./mongo/init.js:/docker-entrypoint-initdb.d/init.js:ro
      - ./mongo/mongo-data:/data/db
    # Start mongo with authentication enabled
    command: [mongod, --auth]

❯ docker-compose up -d

❯ curl http://localhost:8080/ | jq .
[
  {
    "_id": "625103c4f9d2309deaad919e",
    "name": "Echizen",
    "age": 24
  },
  {
    "_id": "625103c4f9d2309deaad919f",
    "name": "Bob",
    "age": 32
  },
]