Kubernetes Interview Questions:
1. Kubernetes Architecture
- Can you explain the architecture of Kubernetes?
- What are the key components of a Kubernetes cluster (e.g., etcd, API server, controller manager, scheduler)?
- How does the Kubernetes control plane manage the state of the cluster?
- What is the role of etcd in a Kubernetes cluster?
- How do you ensure high availability of the Kubernetes control plane?
2. Pods and Deployments
- What is a Pod in Kubernetes, and how does it differ from a container?
- How do you manage and scale applications using Deployments in Kubernetes?
- Can you explain how rolling updates work in Kubernetes?
- What strategies do you use for handling application rollbacks in Kubernetes?
- How do you optimize Pod resource requests and limits?
3. Services and Networking
- How do Kubernetes Services enable communication between Pods?
- What is the difference between ClusterIP, NodePort, and LoadBalancer Services?
- How do you implement ingress in Kubernetes, and what is its purpose?
- What is a Kubernetes NetworkPolicy, and how do you use it to secure communication between Pods?
- How do you troubleshoot networking issues in a Kubernetes cluster?
4. Storage and Persistent Volumes
- What is a PersistentVolume (PV) and PersistentVolumeClaim (PVC) in Kubernetes?
- How do you manage storage in Kubernetes for stateful applications?
- Can you explain the difference between static and dynamic provisioning of Persistent Volumes?
- How do you use StorageClasses to manage different types of storage in Kubernetes?
- What challenges have you faced with persistent storage in Kubernetes, and how did you address them?
5. ConfigMaps and Secrets
- What are ConfigMaps in Kubernetes, and how do you use them?
- How do you manage sensitive information using Kubernetes Secrets?
- What are the security best practices for handling Secrets in Kubernetes?
- How do you inject environment variables into Pods using ConfigMaps and Secrets?
- Can you explain how ConfigMaps and Secrets can be mounted as volumes in a Pod?
6. StatefulSets and DaemonSets
- What is a StatefulSet, and how does it differ from a Deployment?
- When would you use a StatefulSet over a Deployment in Kubernetes?
- How does Kubernetes manage Pod identity and storage with StatefulSets?
- What is a DaemonSet, and when would you use it in a Kubernetes cluster?
- How do you ensure that a DaemonSet runs on specific nodes within the cluster?
7. Kubernetes Security
- How do you secure a Kubernetes cluster?
- What is Role-Based Access Control (RBAC) in Kubernetes, and how do you implement it?
- How do you manage and rotate certificates in a Kubernetes cluster?
- What are Kubernetes Pod Security Policies, and how do you use them to enforce security standards?
- How do you handle image security and vulnerability scanning in Kubernetes?
8. Kubernetes Monitoring and Logging
- What tools do you use to monitor a Kubernetes cluster?
- How do you set up logging in Kubernetes, and what are the best practices?
- What is Prometheus, and how do you integrate it with Kubernetes for monitoring?
- How do you implement alerting for Kubernetes clusters?
- How do you troubleshoot performance issues in a Kubernetes cluster?
9. Kubernetes Autoscaling
- What is the Horizontal Pod Autoscaler (HPA), and how does it work?
- How do you configure Kubernetes to automatically scale based on CPU or memory usage?
- What is the Cluster Autoscaler, and how does it differ from HPA?
- How do you handle scaling for stateful applications in Kubernetes?
- What are some challenges you've encountered with autoscaling in Kubernetes, and how did you solve them?
10. CI/CD Integration with Kubernetes
- How do you integrate Kubernetes with CI/CD pipelines?
- Can you explain a typical CI/CD workflow for deploying applications to a Kubernetes cluster?
- What tools do you use for Kubernetes deployments in a CI/CD pipeline?
- How do you manage blue-green or canary deployments in Kubernetes?
- How do you handle rollback strategies in a CI/CD pipeline with Kubernetes?
11. Helm and Kubernetes
- What is Helm, and how does it help in managing Kubernetes applications?
- Can you explain how Helm charts are structured?
- How do you manage and deploy Helm releases in a Kubernetes environment?
- What are some best practices for creating and managing Helm charts?
- How do you handle versioning and upgrades with Helm?
12. Advanced Kubernetes Features
- What is a Kubernetes Operator, and how does it extend Kubernetes functionality?
- How do you create and manage custom resources (CRDs) in Kubernetes?
- Can you explain the use of service meshes like Istio in a Kubernetes environment?
- How do you manage multi-cluster Kubernetes deployments?
- What are some advanced scheduling features in Kubernetes, such as Taints, Tolerations, and Affinity?
13. Kubernetes in Production
- What are some challenges you've faced when running Kubernetes in production?
- How do you ensure Kubernetes cluster stability and reliability?
- What strategies do you use for disaster recovery in Kubernetes?
- How do you handle Kubernetes cluster upgrades with minimal downtime?
- What are some best practices for managing large-scale Kubernetes deployments?
These questions are designed to assess an experienced Kubernetes engineer's depth of knowledge, hands-on experience, and ability to handle complex scenarios in a production environment.
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