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:

1. 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"]
   

2. 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

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