ECS cluster concept in AWS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an ECS cluster in AWS?

An ECS cluster is a group of servers (called container instances) where your Docker containers run. It helps organize and manage your containers easily.

beginner

How does an ECS cluster relate to container instances?

Container instances are the servers registered to an ECS cluster. They provide the computing resources where containers run.

beginner

Why use an ECS cluster instead of running containers on a single server?

An ECS cluster lets you run containers on many servers, so your app can handle more users and stay running even if one server stops working.

intermediate

What role does the ECS control plane play in a cluster?

The ECS control plane manages the cluster by scheduling containers on instances and monitoring their health, so you don’t have to do it manually.

intermediate

Can an ECS cluster run both EC2 and Fargate tasks?

Yes, an ECS cluster can run tasks on EC2 instances you manage or on Fargate, which is a serverless option where AWS manages the servers.

What is the main purpose of an ECS cluster?

A To group servers that run containers

B To store container images

C To monitor network traffic

D To create databases

An ECS cluster groups servers (container instances) where containers run.

Which component provides computing resources in an ECS cluster?

A ECS control plane

B S3 bucket

C Container instances

D Load balancer

Container instances are the servers that provide resources to run containers.

What happens if one container instance in a cluster fails?

A Other instances keep running containers

B The cluster automatically stops

C All containers stop running

D You lose all data permanently

Other instances in the cluster continue running containers, keeping the app available.

Which AWS service manages the scheduling of containers in an ECS cluster?

A EC2 Auto Scaling

B Route 53

C CloudWatch

D ECS control plane

The ECS control plane schedules containers on the cluster's instances.

Can you run serverless containers in an ECS cluster?

A No, ECS only supports EC2 instances

B Yes, using Fargate

C Only with Lambda functions

D Only with Elastic Beanstalk

ECS supports running serverless containers using Fargate.

Explain what an ECS cluster is and why it is useful for running containers.

Think about how grouping servers helps manage many containers.

Describe the difference between container instances and the ECS control plane in a cluster.

One provides resources, the other manages tasks.