KUBERNETES INTERVIEW HANDBOOK

1. What is Kubernetes?

Answer:

Kubernetes is a container orchestration platform that automates deployment, scaling, load balancing, and self-healing of containerized applications.

2. Why do we need Kubernetes when we already have Docker?

Answer:

Docker runs containers. Kubernetes manages containers at scale with auto-healing, scaling, and orchestration.

3. What problems does Kubernetes solve?

Answer:

Manual container management, downtime, scaling issues, load distribution, and infrastructure abstraction.

4. What are the main components of Kubernetes?

Answer:

Control Plane: kube-apiserver, etcd, scheduler, controller-manager

Worker Node: kubelet, kube-proxy, container runtime

5. What is a Pod?

Answer:

Smallest deployable unit with one or more containers sharing network and storage.

6. What is CrashLoopBackOff?

Answer:

Container repeatedly crashes and Kubernetes applies exponential backoff before restarting.

7. Common causes of CrashLoopBackOff?

Answer:

Bad config, missing env vars, wrong command, dependency failure, OOMKilled.

8. How to debug CrashLoopBackOff?

Answer:

kubectl describe pod, logs, logs –previous, check configs and dependencies.