See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create the 'initcontainer':
- Add a new container definition within the 'spec.template.spec.initContainerS section of the 'web-app' Deployment.
- Name the container as 'db-checker'
- Specify an image that will be used to perform the database health check. You can use a simple image like 'busybox' and install 'curl' in the 'initContainer' to perform the health check.
- The 'command' for the 'initcontainer' should run a 'while' loop that keeps checking the database service's health endpoint until it returns a successful status code.
- You can define the health endpoint in the 'db-service' Deployment's service definition.

2. Update the 'db-service' Deployment - Ensure that the 'db-servjce' Deployment includes a health cneck endpoint in its service definition. - For example, you can expose a health endpoint at 'http://db-service:5432/health' in your database service's configuration. - The health endpoint should return a successful status code (e.g., 200) if the database is running and ready. - If the database is not reachable, the endpoint should return an error code.

3. Apply the changes: - Apply the updated 'web-app' and 'db-service' Deployment YAML files to your Kubernetes cluster using 'kubectl apply' 4. Verify the implementation: - Once the Deployment iS updated, verity that the 'web-app' pods only start atter the 'db-service' pods are ready. - You can observe the 'initcontainer' logs tor the 'db-checker' container to confirm that the health checks are being performed. - You can also monitor the 'db-service' pods to ensure they are in a 'Running' state. This setup will ensure that the 'web-app' containers will not start until the 'db-service' is reachable and healthy. This ensures that the web application has access to the database and can function properly.,