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Deploying a Keystone.js Application using Docker

Keystone.js is a popular Node.js framework for building database-driven applications. Docker is a containerization platform that allows you to package, ship, and run applications in containers. In this article, we will explore how to deploy a Keystone.js application using Docker.

Prerequisites

To follow along with this tutorial, you will 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 Keystone.js Project

If you haven't already, create a new Keystone.js project using the following command:

npm init keystone-app my-app

This will create a new Keystone.js project in a directory called `my-app`. Follow the prompts to set up your project.

Step 2: Create a Dockerfile

Create a new file called `Dockerfile` in the root of your project directory. This file will contain the instructions for building your Docker image.

FROM node:14

WORKDIR /app

COPY package*.json ./

RUN npm install

COPY . .

RUN npm run build

EXPOSE 3000

CMD ["npm", "start"]

This Dockerfile uses the official Node.js 14 image as its base. It then sets up the working directory, copies the `package.json` file, installs the dependencies, copies the rest of the code, builds the application, exposes port 3000, and sets the default command to start the application.

Step 3: Create a Docker Compose File

Create a new file called `docker-compose.yml` in the root of your project directory. This file will contain the instructions for running your Docker containers.

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 defines two services: `app` and `db`. The `app` service builds the Docker image from the current directory, maps port 3000 on the host machine to port 3000 in the container, and sets the `DATABASE_URL` environment variable. The `db` service uses the official Postgres image and sets the `POSTGRES_USER`, `POSTGRES_PASSWORD`, and `POSTGRES_DB` environment variables.

Step 4: Build and Run the Containers

Run the following command to build and run the containers:

docker-compose up -d

This command builds the Docker image, creates the containers, and starts them in detached mode.

Step 5: Verify the Application

Open a web browser and navigate to `http://localhost:3000`. You should see your Keystone.js application running.

Conclusion

In this article, we explored how to deploy a Keystone.js application using Docker. We created a Dockerfile to build the Docker image, a Docker Compose file to run the containers, and verified that the application is running.

Frequently Asked Questions

Q: What is Docker?

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

Q: What is Keystone.js?

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

Q: How do I build the Docker image?

A: You can build the Docker image by running the command `docker-compose build`.

Q: How do I run the containers?

A: You can run the containers by running the command `docker-compose up -d`.

Q: How do I verify the application?

A: You can verify the application by opening a web browser and navigating to `http://localhost:3000`.

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