EKS Interview Questions:
AWS Elastic Kubernetes Service (EKS) is a managed Kubernetes service that simplifies running Kubernetes on AWS without needing to install and operate your own Kubernetes control plane or nodes. For experienced DevOps engineers, interview questions on EKS often focus on architecture, best practices, security, integration, and troubleshooting. Below are some advanced AWS EKS interview questions:
1. EKS Architecture and Setup
- Can you explain the architecture of AWS EKS?
- What are the key differences between running Kubernetes on EKS and on-premises?
- How do you set up an EKS cluster from scratch?
- What are the different types of nodes in an EKS cluster, and how do you manage them?
- How do you manage Kubernetes versions in EKS, and what are the implications of upgrading?
2. EKS Networking
- How does networking work in an EKS cluster?
- Can you explain the role of VPC, subnets, and security groups in EKS?
- How do you set up and manage CNI (Container Network Interface) plugins in EKS?
- What is the difference between the amazon-vpc-cni-k8s and other CNI plugins?
- How do you handle inter-cluster and intra-cluster communication in EKS?
3. EKS Security
- How do you manage security in an EKS environment?
- What is the difference between IAM roles for service accounts and IAM roles for nodes in EKS?
- How do you implement Role-Based Access Control (RBAC) in an EKS cluster?
- What are the best practices for securing your EKS clusters?
- How do you manage secrets in EKS, and what tools do you use?
4. EKS Storage
- What storage options are available for EKS, and how do you choose between them?
- How do you provision Persistent Volumes (PVs) in EKS?
- Can you explain how to use Amazon EFS, EBS, and S3 with EKS?
- How do you handle data persistence and backups in EKS?
- What are the challenges of managing stateful applications in EKS, and how do you address them?
5. EKS Scaling
- How do you implement scaling in an EKS cluster?
- What is the role of the Cluster Autoscaler, and how does it work with EKS?
- How do you set up Horizontal Pod Autoscaling (HPA) in EKS?
- What are the key metrics to monitor for scaling EKS nodes and workloads?
- Can you explain how to use Fargate with EKS for scaling workloads?
6. CI/CD Integration with EKS
- How do you integrate EKS with CI/CD pipelines?
- What tools do you use for automating deployments to EKS?
- Can you describe a typical CI/CD workflow for Kubernetes deployments in EKS?
- How do you handle blue-green or canary deployments in EKS?
- What strategies do you use for managing application rollbacks in EKS?
7. EKS Monitoring and Logging
- What tools do you use to monitor EKS clusters and workloads?
- How do you set up and configure CloudWatch for monitoring EKS?
- Can you explain how to integrate Prometheus and Grafana with EKS?
- How do you manage logging in EKS, and what are the best practices?
- What are the challenges of monitoring and logging in a large EKS environment?
8. EKS Troubleshooting
- How do you troubleshoot networking issues in an EKS cluster?
- What steps do you take to diagnose and fix failing Pods in EKS?
- How do you handle performance issues in EKS?
- What tools and methods do you use for debugging Kubernetes applications in EKS?
- Can you describe a challenging issue you’ve encountered in EKS and how you resolved it?
9. EKS Best Practices
- What are some best practices for deploying applications on EKS?
- How do you ensure high availability and fault tolerance in EKS?
- What strategies do you use for cost optimization in EKS?
- How do you manage multiple environments (e.g., dev, staging, prod) in EKS?
- What are the considerations for running multi-tenant workloads in EKS?
10. EKS with Other AWS Services
- How do you integrate EKS with AWS IAM for authentication and authorization?
- Can you explain the use of AWS ALB Ingress Controller with EKS?
- How do you use AWS App Mesh with EKS for service mesh capabilities?
- What role does AWS Systems Manager play in managing EKS clusters?
- How do you use AWS CodePipeline and CodeBuild for deploying applications to EKS?
11. Advanced EKS Features
- What is the role of AWS Fargate in EKS, and how does it differ from EC2-backed nodes?
- How do you use custom resource definitions (CRDs) in EKS?
- Can you explain the concept of service meshes and how Istio or Linkerd can be used with EKS?
- How do you manage multi-region deployments in EKS?
- What are the advantages of using Bottlerocket OS for EKS worker nodes?
12. Kubernetes Operators in EKS
- What are Kubernetes Operators, and how do they work in EKS?
- Can you explain how to deploy and manage a Kubernetes Operator in an EKS cluster?
- What are the use cases for using Operators in EKS?
- How do you handle versioning and upgrades of Operators in EKS?
- What are the challenges of using Operators in EKS, and how do you overcome them?
These questions are intended to gauge a candidate’s expertise in managing, deploying, and troubleshooting Kubernetes workloads in AWS EKS, as well as their ability to leverage AWS services and best practices to optimize their Kubernetes deployments.
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