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  <title>Deploying a Node.js App to Docker</title>
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  <h1>Deploying a Node.js Application to Docker</h1>
  <p><em>By Alleoko</em></p>

  <p>Docker makes it easier to build, deploy, and run applications inside containers. Here's how to package a Nodejs app into a Docker container in simple steps.</p>

  <h2>1. Prepare your Node.js script</h2>
  <p>Make sure you have a <code>package.json</code> file in your project directory. If you don't have one, you can create it using bash:</p>
    <pre><code>npm init -y</code></pre>
  <p>Create a src folder for index.js, for example <code>src/index.js</code>:</p>
  <p>index.js</p>
  <pre><code>const app = require('express')();

app.get('/', (req, res ) =>
    res.json({ message: 'Welcome to Docker World 🐳' })
);

const port = process.env.PORT || 8080;

app.listen(port, () => console.log(`app listening on http://localhost:${port}`) );</code></pre>

  <h2>2. Create Dockerfile</h2>
    <p>Create a file named <code>Dockerfile</code> in the root of your project directory with the following content:</p>
  <pre><code>FROM node:12

WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
ENV PORT=8080
EXPOSE 8080
CMD [ "npm", "start" ]
</code></pre>


  <h2>4. Build the Docker Image</h2>
  <pre><code>docker build -t nodejs-docker-app .</code></pre>

  <h2>5. Run the Container</h2>
  <pre><code>docker run -p 5000:8080 nodejs-docker-app</code></pre>

  <p>You should now see your app running at <a href="http://localhost:5000" target="_blank">http://localhost:5000</a>.</p>

   <h2>3. Create Docker Compose</h2>
    <p>Optionally, you can create a <code>docker-compose.yml</code> file to simplify running your container:</p>
    <pre><code>version: '3'
services:
  web:
    build: .
    ports:
      - "8080:8080"
  db:
    image: "mysql"
    environment:
      MYSQL_ROOT_PASSWORD: password
    volumes:
      - db-data:/foo

volumes:
  db-data:
</code></pre>
    <p>Run the following command to start your application using Docker Compose:</p>
    <pre><code>docker-compose up</code></pre>
    <p>Your application should now be accessible at <a href="http://localhost:8080" target="_blank">http://localhost:8080</a>.</p>
  <h2>Wrap-up</h2>
  <p>That's it! You've created a Docker container for your Nodejs app and run it successfully. This same container can be pushed to Docker Hub or deployed to cloud platforms.</p>


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