Using Subtrace with 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 -fsSL https://subtrace.dev/install.sh | sh
+ 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

Show example output

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