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Debugging Applications

Kubernetes provides tools to help troubleshoot and debug problems with applications.

Usually is getting familiar with how primitives objects interact with each other, checking the status of objects, and finally checking logs for any last resource clues.

Resources

  • Debugging ODO

    OpenShift Toolkit is an IDE plugin available on VS Code and JetBrains IDEs, that allows you to do all things that odo does, i.e. create, test, debug and deploy cloud-native applications on a cloud-native environment in simple steps.

    Getting started

  • Debugging Applications

    Read about how to debug applications that are deployed into Kubernetes and not behaving correctly.

    Learn more

  • Debugging Services

    You've run your Pods through a Deployment and created a Service, but you get no response when you try to access it. What do you do?

    Learn more

  • Debugging Replication Controllers

    Read about how to debug replication controllers that are deployed into Kubernetes and not behaving correctly.

    Learn more

References

MacOS/Linux/Windows command: 

oc apply -f https://gist.githubusercontent.com/csantanapr/e823b1bfab24186a26ae4f9ec1ff6091/raw/1e2a0cca964c7b54ce3df2fc3fbf33a232511877/debugk8s-bad.yaml

Expose the service using port-forward 

oc port-forward service/my-service 8080:80 -n debug

Try to access the service 

curl http://localhost:8080

Try Out these Commands to Debug 

oc get pods --all-namespaces

oc project debug

oc get deployments

oc describe pod

oc explain Pod.spec.containers.resources.requests

oc explain Pod.spec.containers.livenessProbe

oc edit deployment

oc logs

oc get service

oc get ep

oc describe service

oc get pods --show-labels

oc get deployment --show-labels

MacOS/Linux/Windows command: 

kubectl apply -f https://gist.githubusercontent.com/csantanapr/e823b1bfab24186a26ae4f9ec1ff6091/raw/1e2a0cca964c7b54ce3df2fc3fbf33a232511877/debugk8s-bad.yaml

Expose the service using port-forward 

kubectl port-forward service/my-service 8080:80 -n debug

Try to access the service 

curl http://localhost:8080

Try Out these Commands to Debug 

kubectl get pods --all-namespaces

kubectl config set-context --current --namespace=debug

kubectl get deployments

kubectl describe pod

kubectl explain Pod.spec.containers.resources.requests

kubectl explain Pod.spec.containers.livenessProbe

kubectl edit deployment

kubectl logs

kubectl get service

kubectl get ep

kubectl describe service

kubectl get pods --show-labels

kubectl get deployment --show-labels

Activities

The continuous integration activities focus around Tekton the integration platform. These labs will show you how to build pipelines and test your code before deployment.

Task Description Link Est. Time
Try It Yourself
Debugging Find which service is breaking in your cluster and find out why. Debugging 30 min