Debugging a Kubernetes deployment using IntelliJ IDEA

Category : Kubernetes | Sub Category : Kubernetes With Java | By Prasad Bonam Last updated: 2023-11-21 13:40:07 Viewed : 222

Debugging a Kubernetes deployment using IntelliJ IDEA involves attaching the debugger to the running Java process inside a container. Here are the general steps to debug a Java application running in a Kubernetes pod using IntelliJ IDEA:

Prerequisites:

1. Java Application with Debugging Enabled:

   • Ensure that your Java application is configured to run with debugging enabled. This usually involves adding the JVM options -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005 to your applications startup command.

2. Dockerized Application:

   • Your Java application should be packaged into a Docker image, and the Docker image should be pushed to a registry accessible to your Kubernetes cluster.

3. IntelliJ IDEA with Kubernetes Plugin:

   • Install the "Kubernetes and OpenShift" plugin in IntelliJ IDEA. You can install it from the IntelliJ IDEA marketplace.

Debugging Steps:

1. Open the Project in IntelliJ IDEA:

   • Open your Java project in IntelliJ IDEA.

2. Configure Kubernetes Context:

   • In IntelliJ IDEA, open the "Services" view (View > Tool Windows > Services or Alt + 8).
   • Right-click on "Kubernetes" and select "Add Kubernetes Account."
   • Configure the Kubernetes context with the necessary information for your cluster.

3. Configure Kubernetes Deployment:

   • Open the "Run/Debug Configurations" window (Run > Edit Configurations).
   • Add a new "Kubernetes Deployment" configuration.
   • Configure the deployment settings, specifying the Docker image, container ports, and any environment variables.
   • Ensure that the "Enable JMX" option is disabled.

4. Start the Kubernetes Deployment:

   • Run the Kubernetes deployment configuration to start your application in a Kubernetes pod.

5. Attach Debugger:

   • In the "Services" view, navigate to the "Pods" section under your Kubernetes context.
   • Find the pod running your application.
   • Right-click on the pod and select "Attach Debugger."

6. Configure Remote Debugger:

   • IntelliJ IDEA will prompt you to configure the remote debugger.
   • Ensure that the debugger settings match the JVM options specified in your application for remote debugging.
   • The default port is usually 5005.

7. Start Debugging:

   • Click "OK" to start debugging. IntelliJ IDEA will attach the debugger to the Java process inside the running container.

8. Set Breakpoints and Debug:

   • Set breakpoints in your code as needed.
   • Trigger the part of your application you want to debug.

9. Review Debug Output:

   • Review the debug output in IntelliJ IDEAs debugger console.

10. Stop Debugging:

• When you are done debugging, stop the debugging session in IntelliJ IDEA.

Notes:

• Ensure that the firewall or security groups allow traffic on the specified debugger port (5005 by default).
• If you encounter issues, check the logs of your Kubernetes pod to see if the debugger successfully attached.
• Make sure that your Java application is configured to run in non-suspend mode (suspend=n in the JVM options) to avoid waiting for the debugger to attach before starting.

By following these steps, you should be able to debug your Java application running in a Kubernetes pod using IntelliJ IDEA.