Update README.md

nodejs-app/Dockerfile

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+# Use the official Node.js image
+FROM node:14
+
+# Create and change to the app directory
+WORKDIR /usr/src/app
+
+# Copy application dependency manifests to the container image
+COPY package*.json ./
+
+# Install production dependencies
+RUN npm install
+
+# Copy local code to the container image
+COPY . .
+
+# Run the web service on container startup
+CMD [ "node", "index.js" ]

nodejs-app/index.js

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+const express = require('express');
+const mysql = require('mysql');
+
+const app = express();
+const port = 3000;
+
+// Create a MySQL connection
+const connection = mysql.createConnection({
+  host: 'mysql-container',
+  user: 'myuser',
+  password: 'mypassword',
+  database: 'mydatabase'
+});
+
+// Connect to MySQL
+connection.connect((err) => {
+  if (err) {
+    console.error('Error connecting to MySQL:', err);
+    return;
+  }
+  console.log('Connected to MySQL');
+});
+
+// Define a route to get a random row
+app.get('/random', (req, res) => {
+  const query = 'SELECT * FROM mytable ORDER BY RAND() LIMIT 1';
+  connection.query(query, (err, results) => {
+    if (err) {
+      console.error('Error executing query:', err);
+      res.status(500).send('Server Error');
+      return;
+    }
+    res.json(results[0]);
+  });
+});
+
+// Start the server
+app.listen(port, () => {
+  console.log(`Server running at http://localhost:${port}`);
+});