docker.mdx

title	sidebarTitle	description	icon
Using Subtrace with Docker	Docker	Track requests in your Dockerized app with Subtrace.	docker

If your app runs in a Docker container, you can use Subtrace to monitor all its requests. Here's how you can get started:

Make the following change to your `Dockerfile` to install and use Subtrace in your app's Docker image:

- CMD ["node", "./app.js"]
+ RUN curl -fsSLO https://subtrace.dev/download/latest/$(uname -s)/$(uname -m)/subtrace && chmod +x ./subtrace
+ CMD ["./subtrace", "run", "--", "node", "./app.js"]

Run your Docker container as you normally would, but add `--cap-add=SYS_PTRACE`:

- docker run -t -p 3000:3000 node-app
+ docker run -t -p 3000:3000 --cap-add=SYS_PTRACE node-app

That's it! Open the `subt.link` URL in your browser to see your app's requests show up in real time: