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ECS Clusters

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An Amazon ECS cluster is a logical grouping of resources, such as tasks, services, and container instances working together within an AWS environment. Clusters provide a unified way to manage and orchestrate your containerized applications and the underlying infrastructure. They offer the ability t…

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AWS Certified Solutions Architect - ECS Clusters Example Questions

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Question 1

You are deploying an ECS service with variable traffic. Your top priority is to avoid managing EC2 instances and have AWS automatically provision and scale container compute, paying only for the vCPU and memory your tasks use. Which ECS launch type should you choose?

Correct Answer: Fargate

Fargate is the serverless launch type for Amazon ECS that removes the need to provision, scale, patch, or manage EC2 instances. It automatically provisions the right amount of compute for your tasks and charges based on the vCPU and memory resources you request, making it well-suited for variable workloads when you want to minimize operational overhead. The EC2 launch type requires you to manage the underlying instances and scaling. Options labeled as On-Demand Capacity or Spot Instances refer to EC2 purchasing strategies via capacity providers, not ECS launch types, and they still require managing EC2 infrastructure (Spot also introduces interruption risk).

Question 2

You have several applications running on an ECS cluster which consumes messages from an Amazon SQS queue. One of the applications experiences a sudden increase in load. How do you ensure the application scales automatically?

Correct Answer: Configure Auto Scaling based on SQS queue length.

Configuring Auto Scaling based on SQS queue length allows you to scale the application based on the actual workload. Other options like increasing tasks, CPU, or memory, or manually monitoring the queue won't provide an automatic scaling solution.

Question 3

You have an existing ECS cluster that supports your web application. The application receives traffic through an Application Load Balancer (ALB). You need to deploy a new version of the application with zero downtime. How would you achieve this?

Correct Answer: Create a new task definition for the updated application, update the service with the new task definition, and use a rolling update deployment.

By creating a new task definition with the updated application, updating the service with the new task definition, and using a rolling update deployment, you can ensure zero downtime. The other options involve stopping or replacing the cluster, which can cause downtime and disrupt the application.

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