How do I troubleshoot my Node.js application in Docker?

I'm having issues with my Node.js application running in Docker. What should I check first?

First, check the Docker logs for your container. You can do this by running docker logs <container_id>. What errors do you see?

I see a lot of 'ECONNREFUSED' errors. What does that mean?

'ECONNREFUSED' usually means that your application is trying to connect to a service that isn't running or isn't reachable. Are you sure the service is up?

Yes, the service is running. I can access it from my host machine.

In that case, check your Docker network settings. Make sure your container is on the same network as the service. You can inspect the network with docker network inspect <network_name>.