From Basics to Advanced: Kubernetes Interview Questions Explained

 

🟢 Basic Kubernetes Interview Questions

What is Kubernetes?

Why do we use Kubernetes?

Difference between Docker and Kubernetes?

What is a Pod in Kubernetes?

What is a Node in Kubernetes?

What is a Namespace?

What is a Deployment in Kubernetes?

What is a Service in Kubernetes?

Types of Services in Kubernetes?

What is a Kubelet?

What is a Kubernetes Master Node?

What are Labels and Selectors?

What is ReplicaSet?

What is the difference between ReplicaSet and Deployment?

What is kubectl? (common commands)

What are ConfigMaps?

What are Secrets? Difference between Secret and ConfigMap?

What is ETCD?

What is Scheduler?

What is Container Runtime in Kubernetes?

🟡 Intermediate Kubernetes Questions

Difference between NodePort, ClusterIP, LoadBalancer?

What is Ingress and Ingress Controller?

What is Horizontal Pod Autoscaler (HPA)?

What are taints and tolerations?

What is Node Affinity vs Pod Affinity?

What is DaemonSet?

What is StatefulSet? Difference between StatefulSet and Deployment?

What is Persistent Volume (PV) and Persistent Volume Claim (PVC)?

What is StorageClass?

What happens if the kube-apiserver goes down?

How does Kubernetes handle scaling?

Explain Control Plane vs Worker Node components.

What is kube-proxy?

How does rolling update work in Kubernetes?

How does rollback work in Kubernetes?

What is RBAC in Kubernetes?

What is ServiceAccount?

How do you expose a deployment externally?

What is kubeadm?

How do you check logs of a pod?

🔵 Advanced Kubernetes Questions

What is Custom Resource Definition (CRD)?

What is Operator in Kubernetes?

What is a Mutating / Validating Admission Webhook?

How does Kubernetes perform self-healing?

Can we schedule pods manually without scheduler?

How does Kubernetes handle networking internally?

Difference between CNI, CSI, CRI?

What is Helm and why is it used?

What is Kubernetes API Server and how does it work?

What is Pod Disruption Budget (PDB)?

What is Cluster Autoscaler?

What is Ephemeral Container?

How does Kubernetes perform health checks? (liveness & readiness probe)

What is multi-tenancy in Kubernetes?

What are static pods?

What is kube-controller-manager?

How does Kubernetes maintain desired state?

What are finalizers in Kubernetes?

How to upgrade Kubernetes cluster?

What is HA (High Availability) Kubernetes cluster?

🔥 Scenario-Based / Real-World Questions

Your pod is stuck in Pending state — how will you troubleshoot?

Your pod is crashing repeatedly — how will you debug?

A deployment is not updating — what will you check?

ETCD got corrupted — what will you do?

Kubernetes scheduler is not assigning pods — how will you fix it?

Node is in NotReady state — how to troubleshoot?

You want to deploy a pod on only 1 specific node — how will you do it?

How to restart Kubernetes control plane components?

How do you take ETCD backup and restore?

How to troubleshoot cluster DNS issue?

Application needs persistent storage — how will you set it up?

How to debug network issues between pods?

How to secure Kubernetes Secrets?

A pod is not able to pull image — how will you fix imagePullBackOff?

How to find what scheduled a pod? (scheduler logs/event logs)

🚀 Bonus: HR-Friendly Questions

Why did you learn Kubernetes?

How have you used Kubernetes in your projects?

What are the challenges you faced while working with Kubernetes?

Compare Kubernetes with ECS, Nomad, or OpenShift.

How do you stay updated with Kubernetes changes?

Thank You 😊😎𝒯ĦȺƝƝ𝓚ᶊ