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Lab 12: Kubernetes ConfigMaps

Overview

In this lab, you'll delve into Kubernetes ConfigMaps, focusing on managing non-confidential data and upgrading your application for persistence. ConfigMaps provide a way to decouple configuration artifacts from image content, allowing you to manage configuration data separately from the application.

Task 1: Upgrade Application for Persistence

6 Points:

In this task, you'll enhance your application to persist data and explore ConfigMaps in Kubernetes.

  1. Upgrade Your Application:

    • Modify your application to:
      • Implement a counter logic in your application to keep track of the number of times it's accessed.
      • Save the counter number in the visits file.
      • Introduce a new endpoint /visits to display the recorded visits.
    • Test the changes:
      • Update your docker-compose.yml to include a new volume with your visits file.
      • Verify that the enhancements work as expected, you must see the updated number in the visits file on the host machine.
      • Update the README.md for your application.

  2. Create Pull Requests:

    • Submit a PR to merge your changes into the main branch of the forked repository.
    • Create a PR from the lab12 branch to the main branch in your own repository.

Task 2: ConfigMap Implementation

4 Points:

  1. Understand ConfigMaps:

  2. Mount a Config File:

    • Create a files folder with a config.json file.
    • Populate config.json with data in JSON format.
    • Use Helm to mount config.json:
      • Create a configMap manifest, extracting data from config.json using .Files.Get.
      • Update deployment.yaml with Volumes and VolumeMounts.
      • Install the updated Helm chart and verify success:
        • Retrieve the list of pods: kubectl get po.
        • Use the pod name as proof of successful deployment.
        • Check the ConfigMap inside the pod, e.g., kubectl exec demo-758cc4d7c4-cxnrn -- cat /config.json.

  3. Documentation:

    • Create 12.md in the k8s folder and include the output of relevant commands.

List of Requirements:

  • config.json in the files folder.
  • configMap retrieving data from config.json using .Files.Get.
  • Volumes and VolumeMounts in deployments.yml.
  • 12.md documenting the results of commands.

Bonus

2.5 Points:

  1. Upgrade Bonus App:

    • Implement persistence logic in your bonus app.

  2. ConfigMap via Environment Variables:

    • Utilize ConfigMap via environment variables in a running container using the envFrom property.
    • Provide proof with the output of the env command inside your container.

Guidelines:

  • Maintain clear and organized documentation.
  • Use appropriate naming conventions for files and folders.
  • For your repository PR, ensure it's from the lab12 branch to the main branch.

Note: Clear documentation is crucial to demonstrate successful data persistence and ConfigMap utilization in Kubernetes. Explore the bonus tasks to further enhance your skills.