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 -fsSLO https://subtrace.dev/download/latest/$(uname -s)/$(uname -m)/subtrace && chmod +x ./subtrace
+ 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
3

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

macOSDocker Compose