Amazon ECS Interview Questions and Answers for 10 years experience

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100 Amazon ECS Interview Questions & Answers (10+ Years Experience)

  1. What is Amazon ECS and how does it differ from other container orchestration platforms like Kubernetes?

    • Answer: Amazon ECS (Elastic Container Service) is a fully managed container orchestration service offered by AWS. It allows you to run, manage, and scale containerized applications without needing to manage the underlying infrastructure. Unlike Kubernetes, which requires significant operational overhead and expertise, ECS is simpler to manage and integrate with other AWS services. ECS offers two deployment models: Fargate (serverless) and EC2 Launch Type (managing your own EC2 instances). Kubernetes, on the other hand, offers more granular control and customization but demands deeper expertise in cluster management and networking. The choice depends on your technical expertise, scalability needs, and level of control desired.

  2. Explain the difference between ECS Fargate and EC2 Launch Type.

    • Answer: ECS Fargate is a serverless compute engine for containers. You don't manage servers; AWS handles the underlying infrastructure. It's simpler to operate and scales automatically. EC2 Launch Type, conversely, requires you to manage your own EC2 instances where your containers run. You have more control over the infrastructure but bear responsibility for instance sizing, patching, and maintenance. Fargate is generally preferred for its ease of use and scalability, while EC2 Launch Type offers more control and cost optimization potential for specific use cases.

  3. Describe the ECS architecture and its key components.

    • Answer: The ECS architecture consists of several key components: The ECS Agent (running on each EC2 instance in EC2 Launch Type), responsible for communicating with the ECS Cluster and managing containers. The ECS Cluster, a logical grouping of container instances. The ECS Task, a unit of execution comprising one or more containers. The ECS Service, a long-running process that manages the desired state of a set of tasks. The ECS API, used to interact with the service programmatically. Finally, there's the underlying EC2 infrastructure (in EC2 Launch type) or AWS Fargate (in Fargate Launch type), providing the compute resources.

  4. How do you deploy and manage your ECS tasks?

    • Answer: Deploying and managing ECS tasks involves defining task definitions (specifying containers, resources, and dependencies), registering them with ECS, creating services (to manage desired task count), and using strategies like rolling updates or blue/green deployments to minimize downtime during updates. Monitoring tools like CloudWatch are crucial for tracking task health, resource utilization, and identifying potential issues. Automated CI/CD pipelines are commonly integrated to streamline deployments.

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