EKS vs ECS decision in AWS - Practice Questions

Challenge - 5 Problems

🧠 Conceptual

intermediate

Choosing between EKS and ECS for Kubernetes workloads

You want to run containerized applications using Kubernetes on AWS. Which service should you choose to get a fully managed Kubernetes control plane?

A Amazon EKS (Elastic Kubernetes Service)

B Amazon ECS (Elastic Container Service)

C AWS Lambda

D Amazon EC2

💡 Hint

Think about which service is specifically designed to manage Kubernetes clusters.

Amazon EKS provides a fully managed Kubernetes control plane, making it easier to run Kubernetes clusters without managing the control plane yourself. ECS is AWS's own container orchestration service but does not provide Kubernetes.

❓ Architecture

intermediate

Selecting a container orchestration service for minimal management

Your team wants to deploy containers on AWS with minimal cluster management and no need to manage Kubernetes components. Which service fits best?

A Amazon ECS with Fargate launch type

B Amazon EKS with self-managed nodes

C Amazon EC2 instances running Docker manually

D Amazon EKS with managed node groups

💡 Hint

Consider which option removes the need to manage servers or nodes entirely.

Amazon ECS with Fargate lets you run containers without managing servers or clusters. EKS requires managing Kubernetes nodes, even with managed node groups. Running Docker on EC2 requires full management.

❓ security

advanced

IAM roles and permissions in EKS vs ECS

Which service allows assigning IAM roles directly to individual containers for fine-grained permissions?

A Amazon EKS with Kubernetes RBAC only

B AWS Lambda functions

C Amazon EC2 instances with instance profiles

D Amazon ECS with IAM Roles for Tasks

💡 Hint

Think about which service integrates IAM roles at the container task level.

Amazon ECS supports IAM Roles for Tasks, allowing each container task to have its own IAM role. EKS uses Kubernetes RBAC for permissions inside the cluster but does not assign IAM roles per container natively.

✅ Best Practice

advanced

Cost optimization when choosing between EKS and ECS

You want to minimize operational costs for running container workloads on AWS. Which approach generally reduces costs related to cluster management?

A Use Amazon EKS with self-managed EC2 nodes

B Use Amazon EKS with managed node groups

C Use Amazon ECS with Fargate launch type

D Use Amazon ECS with EC2 launch type

💡 Hint

Consider which option reduces the need to pay for and manage EC2 instances.

Amazon ECS with Fargate removes the need to manage EC2 instances, reducing operational overhead and potentially lowering costs. EKS requires paying for the control plane and managing nodes, which can increase costs.

❓ service_behavior

expert

Behavior of service discovery in EKS vs ECS

Which service natively integrates with AWS Cloud Map for service discovery, allowing automatic registration and DNS resolution of container tasks?

A Amazon EKS

B Amazon ECS

C Amazon EC2 with manual DNS setup

D AWS Lambda

💡 Hint

Think about which service has built-in integration with AWS Cloud Map for service discovery.

Amazon ECS integrates natively with AWS Cloud Map, enabling automatic service discovery and DNS resolution for container tasks. EKS requires additional setup for service discovery.

Practice

1. Which AWS service is best if you want to use Kubernetes features and have more control over container orchestration?

easy

A. Amazon S3

B. Amazon ECS

C. AWS Lambda

D. Amazon EKS

Solution

1. Step 1: Understand Kubernetes and AWS services

   Kubernetes is a popular container orchestration system. Amazon EKS is AWS's managed Kubernetes service.

2. Step 2: Match service to requirement

   Since the question asks for Kubernetes features and control, Amazon EKS fits best.

3. Final Answer:

   Amazon EKS -> Option D

4. Quick Check:

   Kubernetes features = Amazon EKS [OK]

Hint: EKS = Kubernetes control; ECS = simpler AWS container [OK]

Common Mistakes:

• Confusing ECS as Kubernetes service
• Choosing Lambda or S3 which are unrelated
• Thinking ECS offers full Kubernetes features

2. Which of the following is the correct way to describe Amazon ECS?

easy

A. A managed Kubernetes service

B. An object storage service

C. A simple AWS-native container orchestration service

D. A serverless function service

Solution

1. Step 1: Identify ECS service type

   Amazon ECS is AWS's own container orchestration service, simpler than Kubernetes.

2. Step 2: Match description

   It is AWS-native and simpler, not Kubernetes or serverless or storage.

3. Final Answer:

   A simple AWS-native container orchestration service -> Option C

4. Quick Check:

   ECS = simple AWS container service [OK]

Hint: ECS = simple AWS container service, not Kubernetes [OK]

Common Mistakes:

• Calling ECS a Kubernetes service
• Confusing ECS with Lambda or S3
• Mixing up service types

3. You have a team with no Kubernetes experience and want to deploy containers quickly using AWS services. Which service will likely result in faster setup and simpler management?

medium

A. Amazon ECS

B. Amazon EC2 without containers

C. Amazon EKS

D. AWS Elastic Beanstalk

Solution

1. Step 1: Consider team skills and service complexity

   Without Kubernetes experience, simpler AWS-native services are easier to manage.

2. Step 2: Compare ECS and EKS for ease

   ECS is simpler and faster to set up than EKS, which requires Kubernetes knowledge.

3. Final Answer:

   Amazon ECS -> Option A

4. Quick Check:

   No Kubernetes skill = ECS faster setup [OK]

Hint: No Kubernetes skill? Choose ECS for simplicity [OK]

Common Mistakes:

• Choosing EKS despite no Kubernetes experience
• Confusing Elastic Beanstalk with container orchestration
• Ignoring team skill impact

4. A developer tries to deploy a containerized app using Amazon EKS but faces complex setup issues. What is a likely cause?

medium

A. EKS requires Kubernetes knowledge and setup complexity

B. ECS does not support containers

C. EKS does not allow container orchestration

D. ECS is only for serverless functions

Solution

1. Step 1: Understand EKS complexity

   EKS is a managed Kubernetes service, which needs Kubernetes knowledge and setup steps.

2. Step 2: Identify cause of deployment issues

   Complex setup issues usually come from Kubernetes learning curve and configuration.

3. Final Answer:

   EKS requires Kubernetes knowledge and setup complexity -> Option A

4. Quick Check:

   EKS complexity = Kubernetes knowledge needed [OK]

Hint: EKS needs Kubernetes skills; complexity causes issues [OK]

Common Mistakes:

• Thinking ECS can't run containers
• Believing EKS disallows orchestration
• Confusing ECS with serverless only

5. Your project requires running containers with advanced Kubernetes features like custom scheduling and network policies, but your team has limited Kubernetes experience. What is the best approach?

hard

A. Use Amazon ECS for simplicity and skip advanced Kubernetes features

B. Use Amazon EKS and invest in Kubernetes training for your team

C. Use AWS Lambda to run containers without orchestration

D. Use Amazon EC2 instances manually without container orchestration

Solution

1. Step 1: Identify feature needs

   Advanced Kubernetes features require Kubernetes orchestration, which only EKS provides.

2. Step 2: Consider team skills and project needs

   Since the team lacks Kubernetes experience, investing in training is needed to use EKS effectively.

3. Step 3: Evaluate alternatives

   ECS is simpler but lacks advanced Kubernetes features; Lambda and EC2 do not provide needed orchestration.

4. Final Answer:

   Use Amazon EKS and invest in Kubernetes training for your team -> Option B

5. Quick Check:

   Advanced Kubernetes features = EKS + training [OK]

Hint: Advanced Kubernetes needs EKS plus team training [OK]

Common Mistakes:

• Choosing ECS despite missing features
• Using Lambda or EC2 without orchestration
• Ignoring team skill development