Explore real-world Kubernetes challenges and solutions across deployment, scaling, and management in production environments. This quiz is designed for users seeking to evaluate their understanding of Kubernetes best practices and common scenarios in real-life applications.
A web application running on Kubernetes experiences sudden traffic spikes during a marketing campaign. Which approach best ensures automatic scaling to handle increased load efficiently?
Explanation: Configuring a Horizontal Pod Autoscaler based on CPU utilization is the most effective way to automatically scale Pods in response to increased load. Manually adding new worker nodes lacks automation and is slower. Simply increasing memory limits of each Pod does not address scaling; it only impacts resource allocation per Pod. Restarting the cluster is disruptive and does not manage scaling appropriately.
A retail company wants to update its online shopping platform without interrupting user access. Which Kubernetes deployment strategy is best suited to achieve zero downtime during updates?
Explanation: Rolling Update gradually replaces old Pods with new ones, ensuring the application remains available throughout the update process. The Recreate Strategy stops all old Pods before creating new ones, causing downtime. Blue-Grean Deployment is misspelled (should be Blue-Green Deployment), and Immediate Termination is not a recognized deployment method in Kubernetes and would cause service interruption.
An engineering team needs to securely store database credentials used by their microservices on Kubernetes. Which resource type should they use to handle this sensitive information?
Explanation: A Secret is specifically designed to store sensitive data, such as credentials, in a secure and encoded format within the Kubernetes cluster. Configmap is intended for non-sensitive configuration data. Labels and Annotations are metadata used for organizing and describing resources, not for storing sensitive information.
After a node in the Kubernetes cluster unexpectedly fails, which feature ensures that affected application workloads are automatically redeployed on healthy nodes?
Explanation: ReplicaSet maintains the desired number of Pod replicas, ensuring Pods are rescheduled to available nodes when failures occur. DaemonSet ensures one Pod per node and is not intended for general workload rescheduling. StatfulSet (misspelled; correct is StatefulSet) is used for stateful workloads with unique identities. Job runs Pods to completion and is not designed for high availability or rescheduling.
A company is deploying a multi-tier application with separate frontend and backend components in Kubernetes. What built-in resource allows the frontend to locate and communicate with backend Pods reliably?
Explanation: A Service provides a stable endpoint (virtual IP) and manages traffic routing to backend Pods, enabling reliable communication between application tiers. Volume is used for storage needs, not networking. Ingress manages external access to services, not internal service discovery. Namespace helps organize resources, but does not handle communication between Pods.