Top 10 Kubernetes Interview Questions You Must Know in 2026
Kubernetes (K8s) has become the industry standard for container orchestration, and it’s a must-know for any DevOps engineer. Whether you’re a beginner or a seasoned engineer, these questions will sharpen your understanding and help you ace your next interview.
1. What is Kubernetes and what problem does it solve?
Kubernetes is an open-source container orchestration platform originally developed by Google. It automates the deployment, scaling, and management of containerized applications. Before Kubernetes, teams managed containers manually — a task that quickly became unmanageable at scale.
2. Explain the Kubernetes architecture
Kubernetes follows a master-worker architecture. The Control Plane (master) consists of the API Server, etcd, Scheduler, and Controller Manager. Worker Nodes run the actual application pods and include the kubelet, kube-proxy, and a container runtime like containerd.
3. What is a Pod?
A Pod is the smallest deployable unit in Kubernetes. It encapsulates one or more containers that share the same network namespace and storage volumes. Pods are ephemeral — they are created, run, and destroyed by controllers.
4. What is the difference between a Deployment and a StatefulSet?
A Deployment is used for stateless applications. It manages pods that are interchangeable. A StatefulSet is for stateful applications (like databases) where each pod has a unique identity and stable storage.
5. How does Kubernetes handle service discovery?
Kubernetes uses Services as an abstraction to expose pods. DNS-based service discovery allows pods to reach each other by service name. kube-proxy manages network rules for traffic routing.
6. What is a ConfigMap and a Secret?
A ConfigMap stores non-sensitive configuration data as key-value pairs. A Secret stores sensitive data like passwords and API keys, encoded in base64. Both are injected into pods as environment variables or mounted as files.
7. Explain Kubernetes Ingress
Ingress is an API object that manages external access to services, typically HTTP/HTTPS. It provides load balancing, SSL termination, and name-based virtual hosting — acting as a reverse proxy for your services.
8. What is a Namespace?
Namespaces provide a mechanism for isolating groups of resources within a cluster. They are useful for multi-team environments, separating dev/staging/prod workloads, and applying resource quotas.
9. How does Kubernetes handle auto-scaling?
Kubernetes supports Horizontal Pod Autoscaler (HPA) which scales pod replicas based on CPU/memory metrics, Vertical Pod Autoscaler (VPA) which adjusts resource requests/limits, and Cluster Autoscaler which scales the number of nodes.
10. What is a DaemonSet?
A DaemonSet ensures that a copy of a specific pod runs on every (or selected) node in the cluster. Common use cases include log collectors (Fluentd), monitoring agents (Datadog), and network plugins.
Ready to Practice?
Head over to our Kubernetes Interview Questions section to practice these concepts with real interview scenarios.