Merge c62ffcdc52 into 18f59bdb09

nodejs-postgres/README.md

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+# NodeJS with Postgres Connection
+
+This is a sample project that demonstrates how to connect a NodeJS app using Express to a Postgres database using Docker Compose. The project includes the following components:
+
+1. NodeJS app using Express
+2. Postgres database
+3. Docker Compose file to set up the environment 
+
+## Project Structure
+The project consists of the following files:
+
+1. _docker-compose.yml_: The Docker Compose file that defines the services for the NodeJS app and Postgres database, and the network connections between them.
+2. _nodejs directory_: Contains the NodeJS code, including index.js and Dockerfile for building the NodeJS app image.
+3. _postgres directory_: Contains the Dockerfile for building the Postgres database image.
+
+## Getting Started
+To run this project, follow these steps:
+
+1. Clone the repository.
+2. From the root of the directory, run docker-compose up to start the environment.
+3. The NodeJS app will be available at http://localhost:3000 and the Postgres database can be accessed at postgres://myuser:mypassword@localhost:5432/mydb.
+Expected Results
+When you access the NodeJS app at http://localhost:3000, you should see the message "Hello World!" displayed in the browser.
+
+## Conclusion
+This project provides a simple example of how to connect a NodeJS app to a Postgres database using Docker Compose. The project structure follows a standard naming convention and separates the code for the two services into separate directories. By using Docker Compose, it's easy to set up a development environment that can be used to test and debug your NodeJS and Postgres applications.

nodejs-postgres/docker-compose.yml

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+version: '3'
+services:
+  db:
+    build:
+      context: ./postgres
+    ports:
+      - "5432:5432"
+  app:
+    build:
+      context: ./nodejs
+    ports:
+      - "3000:3000"
+    depends_on:
+      - db
+    networks:
+      - backend
+
+networks:
+  backend:

nodejs-postgres/nodejs/Dockerfile

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+FROM node:14
+
+WORKDIR /app
+
+COPY package*.json ./
+
+RUN npm install
+
+COPY . .
+
+EXPOSE 3000
+
+CMD [ "npm", "start" ]

nodejs-postgres/nodejs/index.js

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+const express = require('express');
+const app = express();
+const port = 3000;
+
+app.get('/', (req, res) => {
+  res.send('Hello World!');
+});
+
+app.listen(port, () => {
+  console.log(`Example app listening at http://localhost:${port}`);
+});

nodejs-postgres/nodejs/package.json

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+{
+  "name": "nodejs-express-example",
+  "version": "1.0.0",
+  "description": "A simple NodeJS app using Express",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "dependencies": {
+    "express": "^4.17.1"
+  }
+}

nodejs-postgres/postgres/Dockerfile

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+FROM postgres:12
+
+ENV POSTGRES_DB mydb
+ENV POSTGRES_USER myuser
+ENV POSTGRES_PASSWORD mypassword