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Top Kubernetes Interview Questions and Answers

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Kubernetes or K8s is an open-source container orchestration system designed by Google. It is used for automating software deployment, scaling, and management. While Google designed it initially, the Cloud Native Computing Foundation maintains the project now. This article discusses Kubernetes interview questions to help you with your interview preparation.

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In this article, we’ll cover:

  • Kubernetes Interview Questions and Answers
  • Basic Kubernetes Interview Questions
  • Kubernetes Interview Questions for Experienced Developers
  • Kubernetes Interview Questions for DevOps
  • FAQs on Kubernetes Interview Questions

Kubernetes Interview Questions and Answers

Here are some Kubernetes interview questions and answers to give you an idea of what to expect:

1. Name the different types of controller managers.

The five types of controller managers are endpoints, service accounts, node, namespace, replication, and token controller manager.

2. What is the need for namespaces in Kubernetes?

Namespaces divide cluster resources between users, provide a scope of resources, and help the environment where multiple users spread teams or projects.

3. What are daemon sets, and what’s Kubernetes controller manager?

Daemon sets refer to a set of pods that runs on a host and are used for host layers attributes like simple or monitoring network. The Kubernetes controller manager refers to a daemon that helps with garbage collection, namespace creation, and core control loops. It allows multiple processes to run on the master node.

4. What is a Heapster in Kubernetes?

A Heapster in Kubernetes refers to a metrics collection and performance monitoring system for data the Kublet collects.

5. What does a Kube-scheduler do?

Kube-scheduler works as the default scheduler for Kubernetes. It works by assigning nodes to newly created pods.

Basic Kubernetes Interview Questions

Here are some basic Kubernetes interview questions to get you started:

  1. What is an Operator? Why do we need Operators?
  2. What is Google Kubernetes Engine or GKE?
  3. What is Ingress Default Backend?
  4. List various services available in Kubernetes.
  5. Define Cluster IP.
  6. What is Kubernetes Load Balancing?
  7. Explain Kubernetes Architecture.
  8. What is PDB (Pod Disruption Budget)?
  9. Define node port.
  10. What is Kubelet?
  11. What is Kube-proxy?
  12. What are the disadvantages of Kubernetes?
  13. What are the features of Kubernetes?
  14. What’s the init container, and when can it be used?
  15. Why use Kubernetes?

Kubernetes Interview Questions for Experienced Developers

Now, check these Kubernetes interview questions to gauge your preparation level:

  1. Differentiate between Kubernetes and Docker Swarm?
  2. What is Kubectl used for?
  3. How to run Kubernetes locally?
  4. Name and describe the tools used for container monitoring.
  5. How to run Kubernetes locally?
  6. List components of Kubernetes.
  7. What are federated clusters?
  8. Mention the list of objects of Kubernetes?
  9. Describe the key components of node status?
  10. What is Minikube?
  11. Define orchestration in Kubernetes List tools for container orchestration.
  12. Explain Prometheus in Kubernetes.
  13. Define Stateful sets  Replica set in Kubernetes.
  14. Differentiate between Docker volumes and Kubernetes Volumes.
  15. List out some important Kubectl commands.
  16. Why use the Kube-API server?
  17. Explain the types of Kubernetes pods.
  18. What is the use of the replication controller?
  19. What do you mean by persistent volume?
  20. What are the types of Kubernetes Volume?

Kubernetes Interview Questions for DevOps

Lastly, here are some Kubernetes DevOps interview questions for your interview prep:

  1. What is the issue with using the default namespace, and why do we use namespaces?
  2. Why use Daemon sets?
  3. What is Sematext Docker Agent?
  4. Describe the ways we can provide API-Security on Kubernetes.
  5. What is ContainerCreating pod?
  6. What is the Kubernetes Network Policy?
  7. What is the Kubernetes proxy service?
  8. What are the different K8 services running on nodes, and describe the role of each service?
  9. Describe the use of Load Balance in Kubernetes.
  10. What can we do to increase Kubernetes security?
  11. How would you monitor the Kubernetes cluster?
  12. How would you get the central logs from POD?
  13. How would you do maintenance activity on the K8 node?
  14. How would you configure TLS with Ingress?
  15. How to control the resource usage of POD?

FAQs on Kubernetes Interview Questions

Q1. What are some key components of Kubernetes?

The Control plane, Kubelet, Kube-proxy, Kube controller manager, Etcd, and cloud controller manager are some of the key components of Kubernetes.

Q2. What is responsible for assigning a node to newly created pods in Kubernetes?

The Kube-scheduler is responsible for assigning a node to newly created pods in Kubernetes.

Q3. What task is Kubeproxy responsible for in Kubernetes?

Kube-proxy helps in maintaining the network rules on nodes.

Q4. What are objects used for in Kubernetes?

Objects are used in Kubernetes to represent the state of a cluster. Objects in Kubernetes are persistent entities in the cluster and represent the state of the cluster.

Q5. Where are Kubernetes objects stored?

Kubernetes objects are stored in the Kubernetes cluster storage, usually in Etcd.

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