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Containerizing applications has become a standard practice in modern software development, enabling consistency, portability, and ease of deployment. Deno, a secure runtime for JavaScript and TypeScript, can also benefit from containerization using Docker. This tutorial provides a step-by-step guide to containerize your Deno applications with Docker.
Prerequisites
- Basic knowledge of Deno and JavaScript/TypeScript
- Docker installed on your machine
- A simple Deno application to containerize
Step 1: Prepare Your Deno Application
Create a simple Deno application or use an existing one. For example, save the following code as app.ts:
import { serve } from "https://deno.land/[email protected]/http/server.ts";
const server = serve({ port: 8000 });
console.log("HTTP server running on http://localhost:8000/");
for await (const req of server) {
req.respond({ body: "Hello from Deno inside Docker!" });
}
Step 2: Create a Dockerfile
In the same directory as your app.ts, create a file named Dockerfile with the following content:
FROM denoland/deno:latest
WORKDIR /app
COPY app.ts .
CMD ["run", "--allow-net", "app.ts"]
Step 3: Build the Docker Image
Open your terminal, navigate to the directory containing your Dockerfile, and run the following command to build your Docker image:
docker build -t deno-app .Step 4: Run the Container
Start a container from your image with the command:
docker run -d -p 8000:8000 --name my-deno-app deno-appVisit http://localhost:8000 in your browser to see your Deno application running inside Docker.
Step 5: Managing Your Container
To stop and remove the container, use:
docker stop my-deno-app
docker rm my-deno-appYou can also view logs with:
docker logs my-deno-appConclusion
Containerizing Deno applications with Docker simplifies deployment and ensures consistency across environments. By following this tutorial, you can quickly set up, run, and manage your Deno projects inside Docker containers, making development and production workflows more efficient.