Azure Container Registry (ACR) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Azure Container Registry (ACR)?

Azure Container Registry (ACR) is a private cloud service to store and manage container images securely, similar to a personal library for your app containers.

beginner

How does ACR help in application deployment?

ACR stores container images close to your Azure services, making app deployment faster and more reliable by pulling images from a nearby source.

beginner

What is a container image in the context of ACR?

A container image is a packaged version of an app with everything it needs to run, like a ready-to-go meal stored in ACR for quick use.

intermediate

Name one security feature of Azure Container Registry.

ACR supports Azure Active Directory authentication and role-based access control to keep your container images safe and accessible only to authorized users.

intermediate

What is the benefit of geo-replication in ACR?

Geo-replication copies your container images to multiple Azure regions, so your apps can access images faster and stay available even if one region has issues.

What type of service is Azure Container Registry?

A A private container image storage service

B A virtual machine hosting service

C A database service

D A serverless compute service

Azure Container Registry is a private service to store container images securely.

Which authentication method does ACR support for secure access?

A Basic HTTP authentication

B FTP login

C Azure Active Directory

D Anonymous access

ACR uses Azure Active Directory for secure and managed access.

What is the main purpose of geo-replication in ACR?

A To convert images to virtual machines

B To reduce image size

C To encrypt container images

D To increase image availability across regions

Geo-replication copies images to multiple regions to improve availability and speed.

Which of these is NOT a benefit of using ACR?

A Automatic app code compilation

B Faster container image deployment

C Centralized container image management

D Secure storage of container images

ACR manages container images but does not compile app code automatically.

How does ACR improve deployment speed?

A By compressing images on the fly

B By storing images close to Azure services

C By running containers directly

D By converting images to scripts

Storing images near Azure services reduces download time during deployment.

Explain what Azure Container Registry is and why it is useful.

Think about how you keep your app containers ready and safe.

Describe how geo-replication in ACR benefits application availability and performance.

Imagine having backup copies of your app's containers in different places.

Practice

1. What is the main purpose of Azure Container Registry (ACR)?

easy

A. To securely store and manage container images in Azure

B. To create virtual machines in Azure

C. To monitor network traffic in Azure

D. To manage Azure user permissions

Solution

1. Step 1: Understand what ACR is designed for

   Azure Container Registry is a service to store container images securely in Azure.

2. Step 2: Compare options with ACR's purpose

   Only To securely store and manage container images in Azure describes storing and managing container images, which matches ACR's main use.

3. Final Answer:

   To securely store and manage container images in Azure -> Option A

4. Quick Check:

   ACR purpose = store container images [OK]

Hint: ACR is for container images, not VMs or users [OK]

Common Mistakes:

• Confusing ACR with Azure VM services
• Thinking ACR manages user permissions
• Assuming ACR monitors network traffic

2. Which of the following is the correct Azure CLI command to create an Azure Container Registry named myRegistry in resource group myGroup with the Basic SKU?

easy

A. az acr new --group myGroup --registry myRegistry --tier Basic

B. az acr create --resource-group myGroup --registry-name myRegistry --sku Basic

C. az container registry create --group myGroup --name myRegistry --sku Basic

D. az acr create --resource-group myGroup --name myRegistry --sku Basic

Solution

1. Step 1: Recall the correct Azure CLI syntax for ACR creation

   The correct command uses az acr create with parameters --resource-group, --name, and --sku.

2. Step 2: Match options to correct syntax

   az acr create --resource-group myGroup --name myRegistry --sku Basic matches the exact syntax. Options A, C, and D use incorrect commands or parameter names.

3. Final Answer:

   az acr create --resource-group myGroup --name myRegistry --sku Basic -> Option D

4. Quick Check:

   Correct CLI syntax = az acr create --resource-group myGroup --name myRegistry --sku Basic [OK]

Hint: Use 'az acr create' with --resource-group and --name [OK]

Common Mistakes:

• Using wrong command like 'az acr new'
• Incorrect parameter names like --registry-name
• Confusing 'az container registry' with 'az acr'

3. Given this Azure CLI command sequence, what will be the output of the last command?

az acr create --resource-group myGroup --name myRegistry --sku Standard
az acr login --name myRegistry
az acr repository list --name myRegistry --output json

medium

A. A JSON list of repositories stored in myRegistry, initially empty

B. An error saying the registry does not exist

C. A list of running containers in myRegistry

D. A JSON list of all Azure resource groups

Solution

1. Step 1: Understand the commands run

   The first command creates the registry. The second logs into it. The third lists repositories in JSON format.

2. Step 2: Predict output of repository list on new registry

   Since the registry is new, it has no repositories yet, so the output is an empty JSON list.

3. Final Answer:

   A JSON list of repositories stored in myRegistry, initially empty -> Option A

4. Quick Check:

   New registry repo list = empty JSON list [OK]

Hint: New ACR has empty repo list JSON output [OK]

Common Mistakes:

• Expecting error when registry exists
• Confusing repositories with running containers
• Thinking it lists resource groups

4. You run this command but get an error:

az acr create --resource-group myGroup --name myRegistry --sku Basic --location eastus

What is the most likely cause of the error?

medium

A. The command syntax is incorrect

B. The SKU Basic is not supported in eastus

C. The resource group myGroup does not exist

D. The registry name myRegistry is already in use globally

Solution

1. Step 1: Check command syntax and parameters

   The syntax is correct and Basic SKU is supported in eastus.

2. Step 2: Identify common causes of creation errors

   If the resource group does not exist, creation fails with an error.

3. Final Answer:

   The resource group myGroup does not exist -> Option C

4. Quick Check:

   Missing resource group causes create error [OK]

Hint: Ensure resource group exists before creating ACR [OK]

Common Mistakes:

• Assuming SKU is unsupported without checking
• Ignoring resource group existence
• Thinking registry name conflict causes this error

5. You want to speed up your app deployment by sharing container images across multiple Azure regions. Which ACR feature should you enable to replicate your registry automatically to other regions?

hard

A. Configure Azure Traffic Manager for your registry

B. Enable geo-replication on your Azure Container Registry

C. Use Azure Blob Storage replication instead

D. Create multiple separate registries manually in each region

Solution

1. Step 1: Understand the need for multi-region image availability

   To share images across regions and speed deployment, the registry must replicate images automatically.

2. Step 2: Identify ACR feature for automatic replication

   Geo-replication is the ACR feature that replicates container images across regions automatically.

3. Step 3: Evaluate other options

   Creating registries manually is manual and error-prone. Blob Storage replication is unrelated to container images. Traffic Manager manages traffic, not image replication.

4. Final Answer:

   Enable geo-replication on your Azure Container Registry -> Option B

5. Quick Check:

   Multi-region image sharing = geo-replication [OK]

Hint: Use geo-replication to sync images across regions [OK]

Common Mistakes:

• Manually creating registries instead of replicating
• Confusing storage replication with ACR replication
• Using Traffic Manager for image replication