50 Kubernetes Interview Questions and Answers 2026

Quick Answer: This guide covers the 50 most-asked Kubernetes interview questions and answers for 2026 — Pods, Deployments, Services, Ingress, storage, networking, security, and troubleshooting. Each answer is concise and interview-ready for DevOps, SRE, and cloud-engineer roles.

Kubernetes Fundamentals

1. What is Kubernetes?
   An open-source container orchestration platform that automates deployment, scaling, self-healing, and management of containerized applications.
2. What problems does Kubernetes solve?
   It handles scheduling, scaling, load balancing, rolling updates, self-healing, and service discovery for containers at scale.
3. What is a cluster?
   A set of worker nodes managed by a control plane that runs your containerized workloads.
4. What are the main control plane components?
   kube-apiserver, etcd, kube-scheduler, kube-controller-manager, and cloud-controller-manager.
5. What runs on a worker node?
   kubelet, kube-proxy, and a container runtime (e.g., containerd).
6. What is etcd?
   A distributed key-value store that holds the entire cluster state and configuration.

Workloads (Pods, Deployments, Jobs)

7. What is a Pod?
   The smallest deployable unit — one or more containers sharing network and storage.
8. What is a ReplicaSet?
   Ensures a specified number of identical Pod replicas are running at all times.
9. What is a Deployment?
   Manages ReplicaSets to provide declarative updates, rolling deployments, and rollbacks for stateless apps.
10. What is a StatefulSet?
    Manages stateful apps with stable network identities, ordered deployment, and persistent storage per Pod.
11. What is a DaemonSet?
    Ensures a copy of a Pod runs on every (or selected) node — used for logging/monitoring agents.
12. What is the difference between a Job and a CronJob?
    A Job runs a task to completion; a CronJob runs Jobs on a schedule.
13. What is an init container?
    A container that runs and completes before the app containers start, used for setup tasks.

Networking & Services

14. What is a Service?
    A stable endpoint that exposes a set of Pods, with types ClusterIP, NodePort, and LoadBalancer.
15. What is the difference between ClusterIP, NodePort, and LoadBalancer?
    ClusterIP is internal-only; NodePort exposes a port on each node; LoadBalancer provisions an external cloud load balancer.
16. What is Ingress?
    An API object managing external HTTP/HTTPS access with routing, TLS termination, and host/path rules via an ingress controller.
17. What is kube-proxy?
    A node component that maintains network rules to route traffic to the correct Pods.
18. What is a NetworkPolicy?
    A rule set that controls allowed traffic between Pods/namespaces (a Pod-level firewall).
19. How does DNS work in Kubernetes?
    CoreDNS provides cluster DNS so Services and Pods are reachable by name.
20. What is a Gateway API?
    The modern, more expressive successor to Ingress for managing traffic routing, gaining adoption in 2026.

Configuration & Storage

21. What is a ConfigMap?
    An object for storing non-sensitive configuration as key-value pairs, injected into Pods.
22. What is a Secret?
    An object for sensitive data (passwords, tokens), base64-encoded and optionally encrypted at rest.
23. What is a PersistentVolume (PV) vs PersistentVolumeClaim (PVC)?
    A PV is provisioned storage; a PVC is a user’s request to consume that storage.
24. What is a StorageClass?
    Defines a “class” of storage enabling dynamic provisioning of PVs on demand.
25. What is a namespace?
    A virtual cluster for isolating and organizing resources within a physical cluster.

Scheduling, Scaling & Health

26. How does the scheduler decide where to place a Pod?
    Based on resource requests/limits, node affinity, taints/tolerations, and constraints.
27. What are taints and tolerations?
    Taints repel Pods from nodes; tolerations let specific Pods schedule onto tainted nodes.
28. What is node affinity?
    Rules that attract Pods to nodes with matching labels.
29. What are requests and limits?
    Requests are guaranteed resources for scheduling; limits cap how much a container can use.
30. What is the Horizontal Pod Autoscaler (HPA)?
    Automatically scales the number of Pods based on CPU, memory, or custom metrics.
31. What is the difference between HPA, VPA, and Cluster Autoscaler?
    HPA scales Pods, VPA adjusts Pod resource requests, and Cluster Autoscaler adds/removes nodes.
32. What are liveness, readiness, and startup probes?
    Liveness restarts unhealthy containers; readiness gates traffic; startup handles slow-starting apps.
33. How does Kubernetes self-heal?
    It restarts failed containers, reschedules Pods off dead nodes, and maintains the desired replica count.

Deployments, Helm & GitOps

34. What deployment strategies does Kubernetes support?
    Rolling updates and recreate natively; blue-green and canary via additional tooling.
35. How do you roll back a Deployment?
    kubectl rollout undo deployment/<name>.
36. What is Helm?
    A package manager for Kubernetes that bundles manifests into versioned, templated charts.
37. What is a Helm chart vs a release?
    A chart is the package; a release is an installed instance of that chart in a cluster.
38. What is GitOps?
    Managing clusters declaratively from Git as the source of truth, with Argo CD or Flux reconciling state.
39. What is an Operator?
    A custom controller that uses CRDs to automate management of complex stateful applications.
40. What is a CRD?
    A Custom Resource Definition extends the Kubernetes API with your own resource types.

Security, Observability & Troubleshooting

41. What is RBAC?
    Role-Based Access Control governs who can perform which actions on which resources via Roles and RoleBindings.
42. What is a ServiceAccount?
    An identity for processes running in Pods to authenticate to the API server.
43. How do you secure a Kubernetes cluster?
    Use RBAC, NetworkPolicies, Pod Security Standards, image scanning, secrets encryption, and least privilege.
44. How do you monitor a cluster?
    Prometheus and Grafana for metrics, plus OpenTelemetry and Loki/ELK for traces and logs.
45. How do you debug a Pod stuck in CrashLoopBackOff?
    Check kubectl logs, kubectl describe pod, events, probes, resource limits, and the container command.
46. What does “Pending” Pod status mean?
    The Pod can’t be scheduled — usually insufficient resources, unbound PVC, or taints.
47. What is the difference between kubectl apply and kubectl create?
    create is imperative (fails if exists); apply is declarative (creates or updates from manifests).
48. How do you get a shell inside a running Pod?
    kubectl exec -it <pod> -- /bin/sh.
49. What is a sidecar container?
    A helper container in the same Pod that augments the main app (e.g., logging, proxy).
50. What is a service mesh?
    An infrastructure layer (e.g., Istio, Linkerd) handling service-to-service traffic, security, and observability. See our Kubernetes Tutorial.

Frequently Asked Questions

Are these Kubernetes questions good for beginners?

Yes — the fundamentals and workload sections suit beginners, while scheduling, security, and troubleshooting target experienced and SRE-level candidates.

What Kubernetes topics are most asked in 2026?

Pods/Deployments, Services and Ingress, ConfigMaps/Secrets, autoscaling, RBAC, Helm, GitOps, and real-world troubleshooting (CrashLoopBackOff, Pending Pods).

How should I practice Kubernetes for interviews?

Run a local cluster (Minikube or kind), deploy real apps, break and fix them, and consider the CKA/CKAD certifications.

Related: Docker Interview Questions · Top 50 DevOps Interview Questions · Install Minikube