Why containers on Azure matter - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a basic Azure Container Instance.

Azure

az container create --resource-group myResourceGroup --name mycontainer --image [1] --cpu 1 --memory 1.5

Drag options to blanks, or click blank then click option'

Anginx

Bmyapp

Cazure

Dcontainer

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent or invalid image name.

Confusing resource group or container names with image names.

The nginx image is a common container image used for web servers and is valid for Azure Container Instances.

2fill in blank

medium

Complete the code to expose the container on port 80.

Azure

az container create --resource-group myResourceGroup --name mycontainer --image nginx --ports [1]

Drag options to blanks, or click blank then click option'

A443

B22

C80

D8080

Attempts:

3 left

💡 Hint

Common Mistakes

Using SSH port 22 instead of HTTP port 80.

Using HTTPS port 443 when the container is not configured for SSL.

Port 80 is the standard port for HTTP traffic and is commonly used to expose web containers.

3fill in blank

hard

Fix the error in the command to restart the container instance.

Azure

az container [1] --resource-group myResourceGroup --name mycontainer

Drag options to blanks, or click blank then click option'

Arestart

Bstop

Cdelete

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'create' which tries to make a new container.

Using 'delete' which removes the container.

Using 'stop' which only stops but does not restart.

The restart command is used to restart an existing Azure Container Instance.

4fill in blank

hard

Fill both blanks to define environment variables for the container.

Azure

az container create --resource-group myResourceGroup --name mycontainer --image nginx --environment-variables [1]=[2]

Drag options to blanks, or click blank then click option'

AENVIRONMENT

Bproduction

Cdevelopment

DVERSION

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping variable name and value.

Using unrelated variable names.

Setting environment variable ENVIRONMENT to production is a common practice to configure container behavior.

5fill in blank

hard

Fill all three blanks to create a container with a restart policy and CPU count.

Azure

az container create --resource-group myResourceGroup --name mycontainer --image nginx --restart-policy [1] --cpu [2] --memory [3]

Drag options to blanks, or click blank then click option'

AAlways

B2

C1.5

DNever

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Never' restart policy which stops automatic restarts.

Setting CPU or memory to zero or invalid values.

The Always restart policy ensures the container restarts if it stops. Setting CPU to 2 and memory to 1.5 GB allocates resources appropriately.

Practice

1. Why are containers useful when running applications on Azure?

easy

A. They only work on Windows servers.

B. They require more hardware than traditional apps.

C. They make apps easy to move and run anywhere.

D. They need manual setup for each server.

Solution

1. Step 1: Understand container portability

   Containers package apps with everything needed, so they run the same anywhere.

2. Step 2: Compare with other options

   Unlike manual setups or OS-specific apps, containers simplify moving and running apps.

3. Final Answer:

   They make apps easy to move and run anywhere. -> Option C

4. Quick Check:

   Containers = portability [OK]

Hint: Containers bundle apps for easy movement and running [OK]

Common Mistakes:

• Thinking containers need more hardware
• Believing containers only run on Windows
• Assuming manual setup is always required

2. Which Azure service is designed specifically to run containers easily?

easy

A. Azure Virtual Machines

B. Azure Kubernetes Service

C. Azure Blob Storage

D. Azure SQL Database

Solution

1. Step 1: Identify container-focused services

   Azure Kubernetes Service (AKS) is built to manage and run containers at scale.

2. Step 2: Eliminate unrelated services

   Virtual Machines run full OS, Blob Storage stores files, SQL Database manages data, none focus on containers.

3. Final Answer:

   Azure Kubernetes Service -> Option B

4. Quick Check:

   AKS = container management [OK]

Hint: AKS is Azure's container orchestration service [OK]

Common Mistakes:

• Confusing VMs with container services
• Choosing storage or database services
• Not knowing AKS purpose

3. What happens when you deploy a containerized app on Azure Container Instances (ACI)?

medium

A. Azure automatically provisions compute resources and runs the container.

B. You must manually configure virtual machines before deployment.

C. The app runs only on your local machine, not in the cloud.

D. Azure converts the container into a virtual machine image.

Solution

1. Step 1: Understand Azure Container Instances behavior

   ACI lets you run containers without managing servers; Azure handles resources automatically.

2. Step 2: Compare other options

   Manual VM setup or local-only running is not how ACI works; it does not convert containers to VM images.

3. Final Answer:

   Azure automatically provisions compute resources and runs the container. -> Option A

4. Quick Check:

   ACI = serverless container run [OK]

Hint: ACI runs containers without manual VM setup [OK]

Common Mistakes:

• Thinking manual VM setup is needed
• Believing containers run only locally
• Confusing containers with VM images

4. You tried to deploy a container on Azure but it failed. Which common mistake might cause this?

medium

A. Using too much memory in the container.

B. Deploying without an internet connection.

C. Running the container on a Windows machine.

D. Not specifying the container image name correctly.

Solution

1. Step 1: Identify common deployment errors

   Incorrect container image names cause deployment failures because Azure cannot find the image.

2. Step 2: Evaluate other options

   Memory limits cause runtime issues, not deployment failure; Windows machines can run containers; internet is needed but usually checked beforehand.

3. Final Answer:

   Not specifying the container image name correctly. -> Option D

4. Quick Check:

   Wrong image name = deployment fail [OK]

Hint: Check container image name spelling first [OK]

Common Mistakes:

• Ignoring image name typos
• Confusing runtime errors with deployment errors
• Assuming OS blocks deployment

5. How do containers on Azure help save money and time when scaling an app?

hard

A. They use resources efficiently and start quickly without full OS boot.

B. They require buying extra hardware for each container.

C. They force manual updates on every server.

D. They run only one app per server, increasing costs.

Solution

1. Step 1: Understand container resource use

   Containers share the OS kernel, so they use less memory and CPU than full virtual machines.

2. Step 2: Understand startup and scaling benefits

   Containers start fast without booting an OS, enabling quick scaling and saving time and money.

3. Final Answer:

   They use resources efficiently and start quickly without full OS boot. -> Option A

4. Quick Check:

   Containers = efficient, fast scaling [OK]

Hint: Containers share OS, start fast, save costs [OK]

Common Mistakes:

• Thinking containers need extra hardware
• Believing manual updates are required
• Assuming one app per server