Top 50 Kubernetes Interview Questions and Answers

Updated 7 Jul 2025

Asked in CtrlS

4d ago

Q. How do you deploy a web application into Kubernetes?

Ans.

Deploy webapp into k8s by creating a deployment YAML file and applying it using kubectl command.

  • Create a Docker image of the webapp

  • Create a deployment YAML file with necessary specifications like image, replicas, ports, etc.

  • Apply the deployment YAML ...read more

Asked in Capgemini

6d ago

Q. Explain the concepts of Docker and Kubernetes.

Ans.

Docker is a platform for developing, shipping, and running applications in containers. Kubernetes is a container orchestration tool for managing containerized applications across a cluster of nodes.

  • Docker allows developers to package applications and...read more

Asked in Infosys

6d ago

Q. What is an ingress controller and how is it used in Kubernetes networking?

Ans.

Ingress controller is a Kubernetes resource that manages external access to services within a cluster.

  • Ingress controller acts as a traffic manager, routing incoming traffic to the appropriate services based on rules defined in the Ingress resource.

  • It...read more

Asked in BitCot

2d ago

Q. Why use Kubernetes instead of Docker?

Ans.

Kubernetes offers more advanced orchestration capabilities compared to Docker.

  • Kubernetes provides automated scaling, load balancing, and self-healing for containers.

  • Kubernetes allows for easier management of complex containerized applications across ...read more

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Q. What are the steps to deploy an application to Kubernetes?

Ans.

Steps to deploy an application to Kubernetes

  • Create a Kubernetes deployment file with specifications for the application

  • Apply the deployment file using kubectl apply command

  • Monitor the deployment using kubectl get pods command

  • Expose the application us...read more

Asked in Dover India

4d ago

Q. How will you ensure the Kubernetes cluster is up and running?

Ans.

To ensure Kubernetes cluster is up and running, monitoring tools, automated alerts, and regular health checks are essential.

  • Set up monitoring tools like Prometheus and Grafana to track cluster health and performance metrics

  • Implement automated alerts ...read more

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Asked in Infosys

5d ago

Q. How have you implemented Docker and Kubernetes?

Ans.

I implemented Docker and Kubernetes to containerize and orchestrate my NodeJS applications.

  • I used Docker to create containers for my NodeJS applications, ensuring consistency and portability.

  • I wrote Dockerfiles to define the environment and dependenc...read more

5d ago

Q. Explain the components in Kubernetes.

Ans.

Kubernetes components are essential building blocks that enable containerized applications to run and scale efficiently.

  • Master components: control plane components that manage the cluster

  • Node components: run on each node and manage containers

  • Networki...read more

3d ago

Q. How fluent are you in AWS/Kubernetes?

Ans.

I am highly fluent in AWS and Kubernetes, with extensive experience in designing, implementing, and managing cloud infrastructure.

  • Extensive experience in designing and implementing AWS solutions such as EC2, S3, RDS, Lambda, and VPC

  • Proficient in mana...read more

4d ago

Q. How do you monitor a Kubernetes production instance?

Ans.

To monitor k8s Prod instance, use monitoring tools like Prometheus, Grafana, and Kubernetes Dashboard.

  • Use Prometheus to collect metrics from Kubernetes API server and nodes

  • Visualize the collected data using Grafana dashboards

  • Use Kubernetes Dashboard ...read more

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Asked in Mimecast

1d ago

Q. How do you troubleshoot Kubernetes issues?

Ans.

Troubleshooting Kubernetes issues involves identifying the root cause, checking logs, examining configurations, and using monitoring tools.

  • Identify the specific issue by checking logs and error messages.

  • Examine the Kubernetes configurations to ensure...read more

Asked in TCS

6d ago

Q. Tell me about the Kubernetes architecture.

Ans.

Kubernetes architecture is a container orchestration platform that manages containerized applications across a cluster of nodes.

  • Kubernetes follows a master-slave architecture with a master node and multiple worker nodes.

  • Master node components include...read more

Asked in Dover India

6d ago

Q. What errors have you encountered while working with Kubernetes?

Ans.

Common errors encountered in Kubernetes

  • Pod errors (CrashLoopBackOff, ImagePullBackOff)

  • Node errors (NodeNotReady, NodeOutOfDisk)

  • Service errors (ServiceUnavailable, EndpointsNotFound)

  • PersistentVolume errors (VolumeNotFound, VolumeInUse)

  • Network errors (...read more

Asked in Pitney Bowes

6d ago

Q. What are the services in Kubernetes?

Ans.

Services in Kubernetes are a way to expose a set of pods as a network service.

  • Services provide a stable IP address and DNS name for pods.

  • They can load balance traffic across multiple pods.

  • There are four types of services: ClusterIP, NodePort, LoadBal...read more

1d ago

Q. How do you implement load balancing in Kubernetes?

Ans.

Load balancing in Kubernetes is achieved using a service called Kubernetes Service.

  • Create a Kubernetes Service object with a type of 'LoadBalancer'

  • The Service will automatically create an external load balancer that will distribute traffic to the pod...read more

1d ago

Q. How would you approach capacity planning for a Kubernetes cluster?

Ans.

Capacity planning for a Kubernetes cluster involves analyzing resource usage, predicting future needs, and scaling infrastructure accordingly.

  • Monitor resource usage of pods and nodes using tools like Prometheus and Grafana

  • Analyze historical data to i...read more

2d ago

Q. What would you recommend a junior engineer learn first: Kubernetes or Lambda?

Ans.

It depends on the specific use case and requirements of the project.

  • Consider the complexity and scale of the project - Kubernetes is better suited for large, complex applications with multiple services, while Lambda is more suitable for smaller, even...read more

6d ago

Q. How do you use deployment strategies in Kubernetes?

Ans.

Deployment strategies in Kubernetes help manage the rollout of new versions of applications.

  • Use Rolling Update strategy to gradually replace old Pods with new ones

  • Use Blue-Green Deployment strategy to switch traffic between two identical environments...read more

Asked in LTIMindtree

6d ago

Q. What is kubelet?

Ans.

Kubelet is the primary node agent that runs on each node in a Kubernetes cluster.

  • Kubelet is responsible for managing the pods on the node, ensuring they are running and healthy.

  • It communicates with the Kubernetes API server to receive instructions an...read more

Asked in Capgemini

3d ago

Q. What is a pod in K8s?

Ans.

A pod in K8s is the smallest deployable unit in Kubernetes, consisting of one or more containers that share resources.

  • Pods are used to group containers that need to work together, such as a web server and a database.

  • Pods share the same network namesp...read more

Asked in Carta

6d ago

Q. How can you determine if an image can be deployed in Kubernetes?

Ans.

Images that can be deployed in Kubernetes must be containerized and have a corresponding Kubernetes deployment configuration.

  • Images must be containerized using Docker or another containerization tool.

  • A Kubernetes deployment configuration file must be...read more

Q. How does Kubernetes differ from Docker Swarm?

Ans.

K8s is a container orchestration tool while Docker Swarm is a clustering and scheduling tool for Docker containers.

  • K8s is more widely used and has a larger community support compared to Docker Swarm.

  • K8s supports more advanced features like auto-scali...read more

Asked in Dover India

2d ago

Q. Why does a Pod get restarted automatically?

Ans.

Pods may get restarted automatically due to various reasons such as resource constraints, failures, or updates.

  • Resource constraints like memory or CPU limits being exceeded can trigger a pod restart.

  • Pods may be restarted if they fail health checks de...read more

Q. Write a Kubernetes manifest.

Ans.

A Kubernetes manifest defines the desired state of a cluster

  • Use YAML syntax to define resources like pods, services, deployments, etc.

  • Include metadata like name, labels, and annotations

  • Specify the desired state of the resource, such as replicas, imag...read more

Asked in Lummo

6d ago

Q. Design an algorithm for VPA in Kubernetes.

Ans.

Design algorithm for VPA in Kubernetes

  • Implement a controller that monitors resource usage and adjusts the number of replicas based on demand

  • Utilize Kubernetes Horizontal Pod Autoscaler (HPA) to automatically scale the number of pods in a deployment

  • Co...read more

Asked in Lytx

1d ago

Q. Explain your Kubernetes and Openshift experience

Ans.

I have extensive experience with Kubernetes and Openshift in managing containerized applications and orchestrating deployments.

  • Managed Kubernetes clusters for deploying and scaling microservices

  • Implemented CI/CD pipelines using Jenkins and GitLab for...read more

5d ago

Q. Explain the core features of Kubernetes.

Ans.

Kubernetes is a container orchestration platform that automates deployment, scaling, and management of containerized applications.

  • Automated deployment and scaling of containerized applications

  • Load balancing and service discovery

  • Self-healing and auto-...read more

Asked in Pactap

5d ago

Q. How do you check the status of a Kubernetes pod that is in a pending state?

Ans.

Use kubectl command to check the status of a pending k8s pod.

  • Use 'kubectl get pods' command to list all pods and their statuses

  • Look for the pod in 'Pending' state

  • Check the reason for pending state using 'kubectl describe pod '

Asked in Mphasis

2d ago

Q. What factors would you consider before deploying services to Kubernetes?

Ans.

Factors to consider before deploying services to Kubernetes

  • Resource requirements of the services

  • Networking considerations

  • Security measures

  • Monitoring and logging capabilities

  • High availability and scalability needs

2d ago

Q. Explain the Role and Functionality of the Control Plane Components in Kubernetes.

Ans.

Control plane components in Kubernetes manage the cluster and make decisions about the state of the cluster.

  • Control Manager: Ensures that the desired state of the cluster matches the actual state.

  • Scheduler: Assigns workloads to nodes based on resourc...read more

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