20 Essential AWS ECS Interview Questions with Answers

here are the top 20 AWS ECS (Elastic Container Service) interview questions and answers:

  1. What is AWS ECS?
    AWS ECS is a fully managed container orchestration service that enables you to run and scale Docker containers on a cluster of Amazon EC2 instances.

  2. What is a container in ECS?
    A container is a lightweight, standalone executable package that includes everything needed to run an application, including code, runtime, system tools, libraries, and settings.

  3. What is a task definition in ECS?
    A task definition is a blueprint that describes how a container should be run. It includes information about the container image, CPU and memory requirements, network settings, and other parameters.

  4. What is a service in ECS?
    A service is a long-running task that ensures that a specified number of instances of a task definition are running and healthy at any given time.

  5. What is a cluster in ECS?
    A cluster is a group of container instances that are managed together as a single unit.

  6. What is the difference between a task and a service in ECS?
    A task is a single instance of a container that runs on an ECS cluster, while a service ensures that a specified number of instances of a task definition are running and healthy at any given time.

  7. How does ECS manage container instances?
    ECS manages container instances by automatically deploying, scaling, and scheduling containers across a cluster of Amazon EC2 instances.

  8. How does ECS handle load balancing?
    ECS supports load balancing through the use of an Application Load Balancer or a Network Load Balancer. Load balancing ensures that traffic is distributed evenly across the instances in a cluster.

  9. How does ECS handle auto scaling?
    ECS supports auto scaling through the use of Amazon EC2 Auto Scaling. Auto scaling enables you to automatically adjust the number of container instances in a cluster based on CPU utilization, memory utilization, or custom metrics.

  10. How does ECS integrate with other AWS services?
    ECS integrates with other AWS services such as Amazon ECR for container image management, AWS CloudFormation for infrastructure management, AWS IAM for authentication and access control, and Amazon CloudWatch for monitoring and logging.

  11. What is the difference between ECS and Kubernetes?
    ECS is a fully managed container orchestration service provided by AWS, while Kubernetes is an open-source container orchestration platform that can be run on any cloud or on-premises infrastructure.

  12. What is Fargate in ECS?
    Fargate is a serverless compute engine for containers that allows you to run containers without having to manage the underlying infrastructure. With Fargate, you only pay for the resources your containers use.

  13. What is the difference between ECS and Fargate?
    ECS is a container orchestration service that allows you to manage and run containers on a cluster of Amazon EC2 instances, while Fargate is a serverless compute engine that allows you to run containers without having to manage the underlying infrastructure.

  14. How does ECS handle container networking?
    ECS supports container networking through the use of the Amazon VPC (Virtual Private Cloud) network. Containers can be attached to one or more VPCs, and network traffic can be controlled using security groups and network ACLs.

  15. How does ECS handle container storage?
    ECS supports container storage through the use of Amazon EBS (Elastic Block Store) volumes or Amazon EFS (Elastic File System) file systems. Containers can access storage volumes through mount points.

  16. How does ECS handle container security?
    ECS provides container security through the use of AWS IAM (Identity and Access Management), AWS KMS (Key Management Service), and security groups. Containers can also be configured with custom security settings.

  17. How does ECS handle container logging?
    ECS supports container logging through the use of Amazon CloudWatch Logs. Logs can be collected from multiple containers and stored centrally in CloudWatch Logs for analysis and troubleshooting.

  18. What is the maximum number of tasks that can be run in an ECS cluster?
    The maximum number of tasks that can be run in an ECS cluster depends on the instance types and the configuration of the cluster. However, AWS recommends limiting the number of tasks to 10 per CPU core.

  19. What is the difference between a public and a private subnet in ECS?
    A public subnet is a subnet that has a route to the Internet Gateway, while a private subnet does not. In ECS, containers can be deployed in either a public or a private subnet, depending on the requirements of the application.

  20. What is the cost of using ECS?
    The cost of using ECS depends on several factors, including the number of container instances, the amount of CPU and memory used, and the network traffic generated by the application. AWS provides a pricing calculator that can be used to estimate the cost of using ECS.

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