HomeAwsAWS ECS(Elastic Container Service) Interview Questions

AWS ECS(Elastic Container Service) Interview Questions

AWS ECS Interview Questions:

1. AWS ECS Fundamentals

  • Can you explain the architecture of AWS ECS?
  • What are the main components of ECS, such as Task Definitions, Services, Clusters, and Tasks?
  • What is the difference between ECS and EKS (Elastic Kubernetes Service)?
  • How does ECS differ from Docker Swarm or Kubernetes?
  • What are the differences between the Fargate and EC2 launch types in ECS?

2. Task Definitions and Services

  • What is a Task Definition in ECS, and what role does it play?
  • How do you configure and manage environment variables in ECS Task Definitions?
  • Can you explain the difference between a Task and a Service in ECS?
  • How do you handle updating or rolling back Task Definitions in ECS?
  • What is the purpose of the Service Scheduler in ECS, and how does it manage tasks?

3. ECS Clusters

  • How do you create and manage ECS Clusters?
  • What are the key differences between using a dedicated EC2 instance cluster versus Fargate?
  • How do you manage resource allocation and scaling within an ECS Cluster?
  • What are ECS Container Instances, and how do they relate to Clusters?
  • How do you handle cluster scaling and resource optimization in ECS?

4. Networking in ECS

  • How do you configure networking for ECS tasks?
  • What is the role of an ECS Service with an Application Load Balancer (ALB)?
  • Can you explain how to set up and manage VPC networking for ECS tasks?
  • How do you handle service discovery and DNS resolution in ECS?
  • What is the difference between awsvpc, bridge, and host networking modes in ECS?

5. ECS Security

  • How do you secure ECS tasks and services?
  • What are the best practices for managing IAM roles and policies with ECS?
  • How do you handle secrets management in ECS?
  • Can you explain the concept of ECS Task Role and how it differs from an EC2 Instance Role?
  • How do you ensure network security within an ECS environment, such as managing security groups and network ACLs?

6. ECS Scaling

  • How do you implement auto-scaling for ECS services?
  • What are the key metrics you monitor to scale ECS tasks and services?
  • How do you configure ECS Service Auto Scaling based on custom CloudWatch metrics?
  • What strategies do you use to handle scaling for applications with unpredictable traffic patterns?
  • Can you explain how Cluster Auto Scaling works with ECS on EC2?

7. ECS and CI/CD

  • How do you integrate ECS with CI/CD pipelines?
  • What tools and practices do you use for deploying applications to ECS through CI/CD?
  • Can you explain a typical CI/CD workflow for ECS, including code build, image build, and deployment?
  • How do you manage blue-green or canary deployments in ECS?
  • What are some challenges you’ve faced while integrating ECS with CI/CD, and how did you overcome them?

8. ECS with Fargate

  • What is AWS Fargate, and how does it simplify ECS management?
  • How do you decide whether to use Fargate or EC2 launch types for your ECS tasks?
  • Can you explain the pricing model for ECS tasks running on Fargate?
  • What are the limitations of using Fargate compared to EC2-backed ECS?
  • How do you monitor and troubleshoot Fargate tasks?

9. Monitoring and Logging

  • How do you monitor ECS tasks and services?
  • What tools do you use for logging and monitoring ECS?
  • Can you explain how to set up CloudWatch for ECS task and service monitoring?
  • How do you handle log aggregation for ECS containers?
  • What are the best practices for setting up alerts and monitoring dashboards for ECS?

10. Advanced ECS Concepts

  • How do you manage ECS with AWS CDK or Terraform?
  • What is the role of Service Discovery in ECS, and how do you set it up?
  • Can you explain the concept of ECS Task Placement Strategies and Constraints?
  • How do you manage multi-region deployments with ECS?
  • What are the benefits and challenges of using ECS in a microservices architecture?

11. Troubleshooting

  • How do you troubleshoot failing ECS tasks?
  • What steps do you take when an ECS service is not scaling as expected?
  • How do you diagnose and fix networking issues in ECS tasks?
  • What tools and methods do you use to investigate performance issues in ECS?
  • Can you describe a challenging issue you’ve faced with ECS and how you resolved it?

12. Best Practices

  • What are some best practices for deploying applications on ECS?
  • How do you ensure high availability and fault tolerance for applications running on ECS?
  • What strategies do you use for optimizing cost when using ECS?
  • How do you handle application updates and versioning in ECS?
  • What are the best practices for securing ECS containers and tasks?

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