Using Keystone.js with Containerization (Docker)

Keystone.js is a popular Node.js framework for building database-driven applications. It provides a simple and intuitive way to create RESTful APIs, manage data models, and handle authentication. Containerization using Docker is a great way to deploy Keystone.js applications, as it provides a consistent and reliable environment for your application to run in. In this article, we'll explore how to use Keystone.js with containerization using Docker.

Prerequisites

To follow along with this article, you'll need to have the following installed on your machine:

• Node.js (version 14 or higher)
• Docker (version 20.10 or higher)
• Docker Compose (version 2.0 or higher)
• A code editor or IDE of your choice

Step 1: Create a new Keystone.js project

To create a new Keystone.js project, run the following command in your terminal:

npm init keystone-app my-app

This will create a new directory called `my-app` with a basic Keystone.js project setup.

Step 2: Install dependencies

Change into the `my-app` directory and install the required dependencies:

cd my-app
npm install

Step 3: Create a Dockerfile

Create a new file called `Dockerfile` in the root of your project directory:

FROM node:14

WORKDIR /app

COPY package*.json ./

RUN npm install

COPY . .

RUN npm run build

EXPOSE 3000

CMD ["npm", "start"]

This Dockerfile tells Docker to:

• Use the official Node.js 14 image as a base
• Set the working directory to `/app`
• Copy the `package.json` file into the container
• Install the dependencies using `npm install`
• Copy the rest of the code into the container
• Run the `build` script using `npm run build`
• Expose port 3000
• Set the default command to `npm start`

Step 4: Create a docker-compose.yml file

Create a new file called `docker-compose.yml` in the root of your project directory:

version: '3'
services:
  app:
    build: .
    ports:
      - "3000:3000"
    depends_on:
      - db
    environment:
      - DATABASE_URL=postgres://user:password@db:5432/database
  db:
    image: postgres
    environment:
      - POSTGRES_USER=user
      - POSTGRES_PASSWORD=password
      - POSTGRES_DB=database
    volumes:
      - db-data:/var/lib/postgresql/data

volumes:
  db-data:

This docker-compose file tells Docker to:

• Build the `app` service using the Dockerfile in the current directory
• Map port 3000 on the host machine to port 3000 in the container
• Depend on the `db` service
• Set the `DATABASE_URL` environment variable
• Use the official Postgres image for the `db` service
• Set the Postgres environment variables
• Persist the Postgres data using a named volume

Step 5: Start the application

Run the following command to start the application:

docker-compose up

This will start the `app` and `db` services, and make the application available at http://localhost:3000.

Conclusion

In this article, we've explored how to use Keystone.js with containerization using Docker. We've created a new Keystone.js project, installed dependencies, created a Dockerfile, and created a docker-compose file. We've also started the application using Docker Compose.

FAQs

Q: What is Keystone.js?

A: Keystone.js is a popular Node.js framework for building database-driven applications.

Q: What is Docker?

A: Docker is a containerization platform that allows you to package, ship, and run applications in containers.

Q: What is Docker Compose?

A: Docker Compose is a tool for defining and running multi-container Docker applications.

Q: How do I start the application?

A: Run the command `docker-compose up` to start the application.

Q: How do I access the application?

A: The application is available at http://localhost:3000.