Container services comparison in Azure - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Differences between Azure Container Instances and Azure Kubernetes Service

Which statement correctly describes a key difference between Azure Container Instances (ACI) and Azure Kubernetes Service (AKS)?

A AKS is serverless and does not require cluster management, while ACI requires manual server setup.

B Both ACI and AKS require manual scaling of container instances.

C ACI is a serverless container service that runs containers without managing servers, while AKS requires managing a Kubernetes cluster.

D ACI supports complex orchestration features like automatic load balancing, while AKS does not.

💡 Hint

Think about which service abstracts infrastructure management.

Azure Container Instances (ACI) lets you run containers without managing servers or clusters, making it serverless. Azure Kubernetes Service (AKS) provides managed Kubernetes clusters, so you manage the cluster but not the underlying servers.

❓ Architecture

intermediate

Choosing container service for microservices architecture

You want to deploy a microservices application with multiple containers that need to communicate, scale independently, and have rolling updates. Which Azure container service is best suited?

A Azure Kubernetes Service (AKS) because it supports orchestration, scaling, and rolling updates.

B Azure Container Instances (ACI) because it supports complex orchestration and rolling updates.

C Azure App Service because it is designed for container orchestration.

D Azure Functions because it runs containers with microservices support.

💡 Hint

Consider which service supports container orchestration and scaling features.

AKS supports container orchestration, allowing multiple containers to communicate, scale independently, and perform rolling updates. ACI is for simple container runs without orchestration.

❓ service_behavior

advanced

Behavior of Azure Container Instances on resource limits

What happens when an Azure Container Instance exceeds its allocated CPU or memory limits during runtime?

A The container continues running without any impact despite exceeding limits.

B The container is automatically restarted by ACI to recover from resource exhaustion.

C ACI automatically scales up resources to meet container demand.

D The container is throttled or terminated by the platform, causing possible failure.

💡 Hint

Think about how resource limits protect the host environment.

When a container exceeds its CPU or memory limits in ACI, the platform throttles or terminates the container to protect resources. It does not auto-scale or restart containers automatically.

❓ security

advanced

Securing container images in Azure container services

Which option best describes a recommended practice to secure container images used in Azure Container Instances or AKS?

A Store container images in Azure Container Registry with image scanning and access control.

B Use public container registries without authentication for faster deployment.

C Build container images directly on the production cluster to avoid image transfer.

D Use unverified third-party images to save time on development.

💡 Hint

Consider how to protect images from vulnerabilities and unauthorized access.

Storing images in Azure Container Registry allows you to control access and scan images for vulnerabilities, improving security. Public registries without authentication or unverified images increase risk.

✅ Best Practice

expert

Optimizing cost and performance for container workloads in Azure

You have a variable workload with unpredictable spikes running containerized apps. Which approach best balances cost efficiency and performance using Azure container services?

A Use AKS with manual scaling to adjust nodes once per month.

B Use Azure Container Instances for burst workloads and AKS for steady workloads, combining both.

C Use only Azure Container Instances for all workloads regardless of size or duration.

D Use Azure Kubernetes Service with a fixed number of nodes to handle peak load at all times.

💡 Hint

Think about combining services to optimize cost and handle spikes.

Combining ACI for burst workloads and AKS for steady workloads allows cost savings by avoiding over-provisioning while maintaining performance during spikes.

Practice

1. Which Azure container service is best for quickly running a single container without managing servers?

easy

A. Azure Container Apps

B. Azure Kubernetes Service (AKS)

C. Azure App Service for Containers

D. Azure Container Instances (ACI)

Solution

1. Step 1: Understand the purpose of Azure Container Instances

   ACI is designed for running containers quickly without managing servers or clusters.

2. Step 2: Compare with other services

   AKS is for orchestrating many containers, App Service is for web apps, and Container Apps are for serverless microservices.

3. Final Answer:

   Azure Container Instances (ACI) -> Option D

4. Quick Check:

   Quick single container without servers = ACI [OK]

Hint: Quick single container? Pick ACI for no server hassle [OK]

Common Mistakes:

• Confusing AKS with ACI for simple container runs
• Choosing App Service for non-web app containers
• Thinking Container Apps are for quick single containers

2. Which syntax correctly describes Azure Kubernetes Service (AKS)?

easy

A. Simple web app hosting with container support

B. Managed Kubernetes cluster for container orchestration

C. Serverless container hosting without cluster management

D. Event-driven microservices with automatic scaling

Solution

1. Step 1: Identify AKS features

   AKS provides managed Kubernetes clusters to orchestrate many containers.

2. Step 2: Match features to options

   Managed Kubernetes cluster for container orchestration matches AKS; A describes App Service, B describes ACI, D describes Container Apps.

3. Final Answer:

   Managed Kubernetes cluster for container orchestration -> Option B

4. Quick Check:

   AKS = Managed Kubernetes cluster [OK]

Hint: AKS means managed Kubernetes cluster orchestration [OK]

Common Mistakes:

• Mixing AKS with serverless container hosting
• Confusing App Service with AKS
• Thinking Container Apps are AKS

3. Given this scenario: You want to deploy a web app using containers with minimal infrastructure management. Which Azure service will you use?

medium

A. Azure App Service for Containers

B. Azure Kubernetes Service

C. Azure Container Instances

D. Azure Container Apps

Solution

1. Step 1: Understand the scenario requirements

   The need is for a web app using containers with minimal infrastructure management.

2. Step 2: Match service to scenario

   App Service for Containers is designed for easy web app deployment with container support and minimal management.

3. Final Answer:

   Azure App Service for Containers -> Option A

4. Quick Check:

   Web app + containers + minimal management = App Service [OK]

Hint: Web app + containers + easy = App Service for Containers [OK]

Common Mistakes:

• Choosing AKS for simple web app deployment
• Using ACI for web apps needing scaling
• Confusing Container Apps with App Service

4. You deployed a container app but it does not scale automatically on events. Which Azure container service should you check if you want serverless event-driven scaling?

medium

A. Azure Container Instances

B. Azure App Service for Containers

C. Azure Container Apps

D. Azure Kubernetes Service

Solution

1. Step 1: Identify the scaling requirement

   The app needs automatic scaling triggered by events (serverless event-driven).

2. Step 2: Match service with event-driven scaling

   Azure Container Apps supports serverless microservices with event-driven automatic scaling.

3. Final Answer:

   Azure Container Apps -> Option C

4. Quick Check:

   Event-driven serverless scaling = Container Apps [OK]

Hint: Event-driven auto scale? Use Container Apps [OK]

Common Mistakes:

• Expecting ACI to auto scale on events
• Using AKS without configuring autoscaling
• Confusing App Service with event-driven scaling

5. You need to run multiple microservices that must communicate securely, scale automatically on demand, and you want to avoid managing Kubernetes clusters. Which Azure container service fits best?

hard

A. Azure Container Apps

B. Azure Container Instances (ACI)

C. Azure Kubernetes Service (AKS)

D. Azure App Service for Containers

Solution

1. Step 1: Analyze requirements

   Multiple microservices need secure communication and automatic scaling without managing Kubernetes clusters.

2. Step 2: Evaluate service options

   AKS requires cluster management, ACI is for single containers, App Service is for web apps. Container Apps provide serverless microservices with secure communication and auto scaling without cluster management.

3. Final Answer:

   Azure Container Apps -> Option A

4. Quick Check:

   Microservices + secure + auto scale + no cluster = Container Apps [OK]

Hint: Microservices + no cluster + auto scale = Container Apps [OK]

Common Mistakes:

• Choosing AKS despite cluster management requirement
• Using ACI for multiple microservices
• Confusing App Service with microservices orchestration