How to set intellij remote debug?

Question

I am trying to debug my app in testing environment, my app is running in pod, I said 'pod' because I am not familiar with Kubernetes , its manage client looks like this: app running schematic diagram . I have learn I should set idea like this idea RUN/Debug Configurations schematic diagram . And should restart and redeploy my app, I changed Dockfile firstly. the origin instruction is FROM xxx/java:alpine VOLUME /tmp ADD recruitment.jar app.jar ENTRYPOINT ["java","-Xmx2048m","-jar","/app.jar"] and I changed this to FROM xxx/java:alpine VOLUME /tmp ADD recruitment.jar app.jar ENTRYPOINT ["java","-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005","-jar","/app.jar"] but it always show error like this Error running 'face_remote': Unable to open debugger port (888.88.888.888[not real]:5005): java.io.IOException "handshake timeout" . I am not sure with this ip,sicne I use 'ping 888.88.888.888' instruction can not success. I use this ip because Swagger request url's domain name's ip is this.this main enter image description here . and I guess if the app is running in docker or k8s and it will have a different Interactive mode. not same like just running in linux

Answer 1

most of the attached image are not visible.

• IP address should be accessible from your local system [888.88.888.888] note sure this is correct.
• debug port also need to be mapped from your local system -use port forwarding ex:kubectl port-forward 5005:5005

If you have configure port forwarding then you can use localhost:5005 for debugging

Answer 2

I see three things that you can check:

Check the IP address: The jar file runs inside a Docker container, which runs inside a pod. To access the pod you usually go through a service and an ingress. The ip you are using is most likely hitting the ingress/service or any other higher layer.

To attach a remote debugger, you will need to connect directly to the PodIP . One way of doing this is to first connect to your kubernetes cluster using the tool kubectl (some configuration required) and make a port forward from your pod: kubectl port-forward my-pod-c93b8b6df-8c4aa 5005:5005 pod (as an example, the pod instance name is my-pod-c93b8b6df-8c4aa).

This will open a connection from your local computer into the pod. Then you will need to identify the PodIP by kubectl describe pods my-pod-c93b8b6df-8c4aa and use that in IntelliJ

Check if the port is exposed: Make sure you expose the port 5005 from the pod in your test environment (similar to exposing a port when you run the container locally).

How to do this depends a bit on how you are running your Kubernetes cluster. If you use Helm chart, you can just add a configuration like this in the port section of your deployment yaml:

- containerPort: 5005
  name: debug
  protocol: TCP

Check debug-command address: Last thing is to make sure you are adding the correct address in the command line option. As IntelliJ suggest in the debug editor: for JDK9+ use …suspend=n,address=*:5005 and for JDK8 and below use …suspend=n,address=5005