Deployment slots for staging in Azure - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a deployment slot named 'staging'.

Azure

az webapp deployment slot create --name myApp --resource-group myResourceGroup --slot [1]

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

Astaging

Bproduction

Ctest

Ddev

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'production' instead of 'staging' as the slot name.

The deployment slot name for staging is usually 'staging'.

2fill in blank

medium

Complete the code to swap the 'staging' slot with the production slot.

Azure

az webapp deployment slot swap --name myApp --resource-group myResourceGroup --slot [1]

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

Astaging

Btest

Cproduction

Ddev

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the 'production' slot with itself.

Swapping the 'staging' slot with production promotes the staged version to live.

3fill in blank

hard

Fix the error in the command to list all deployment slots for 'myApp'.

Azure

az webapp deployment slot [1] --name myApp --resource-group myResourceGroup

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

Acreate

Bshow

Clist

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'show' which displays a single slot, not all slots.

The correct command to list deployment slots is 'list'.

4fill in blank

hard

Fill both blanks to set the configuration source to 'staging' slot when creating a new slot.

Azure

az webapp deployment slot create --name myApp --resource-group myResourceGroup --slot [1] --configuration-source [2]

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

Astaging

Bproduction

CmyApp

Ddev

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'production' as configuration source when creating a 'staging' slot with staging config.

The new slot is named 'staging' and its configuration is copied from the 'staging' slot.

5fill in blank

hard

Fill all three blanks to update app settings for the 'staging' slot.

Azure

az webapp config appsettings set --name myApp --resource-group myResourceGroup --slot [1] --settings [2]=[3]

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

Astaging

Bproduction

CDEBUG

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Updating the 'production' slot by mistake.

We update the 'staging' slot's app setting 'DEBUG' to 'True'.

Practice

1. What is the main purpose of using deployment slots in Azure App Service?

easy

A. To create multiple independent apps with separate resources

B. To test new app versions safely before making them live

C. To increase the storage capacity of the app

D. To backup the app data automatically

Solution

1. Step 1: Understand deployment slots purpose

   Deployment slots allow you to deploy a new version of your app in a separate slot to test it without affecting the live app.

2. Step 2: Compare options with deployment slots function

   Options A, B, and D describe unrelated features like independent apps, storage, or backups, which are not the main purpose of deployment slots.

3. Final Answer:

   To test new app versions safely before making them live -> Option B

4. Quick Check:

   Deployment slots = safe testing before live [OK]

Hint: Deployment slots = safe app version testing before live [OK]

Common Mistakes:

• Thinking slots increase storage
• Confusing slots with separate apps
• Assuming slots are for backups

2. Which of the following is the correct way to swap a staging slot with the production slot in Azure CLI?

easy

A. az webapp deployment swap --name MyApp --resource-group MyGroup --slot staging

B. az webapp slot swap --name MyApp --resource-group MyGroup --slot production

C. az webapp deployment slot swap --name MyApp --resource-group MyGroup --slot staging

D. az webapp deployment slot switch --name MyApp --resource-group MyGroup --slot staging

Solution

1. Step 1: Identify correct Azure CLI command syntax

   The correct command to swap deployment slots is az webapp deployment slot swap with parameters for app name, resource group, and slot.

2. Step 2: Check each option's command correctness

   az webapp deployment slot swap --name MyApp --resource-group MyGroup --slot staging matches the correct syntax exactly. Options B, C, and D have incorrect command names or parameters.

3. Final Answer:

   az webapp deployment slot swap --name MyApp --resource-group MyGroup --slot staging -> Option C

4. Quick Check:

   Correct CLI swap command = az webapp deployment slot swap --name MyApp --resource-group MyGroup --slot staging [OK]

Hint: Use 'az webapp deployment slot swap' with --slot staging [OK]

Common Mistakes:

• Using 'slot swap' instead of 'deployment slot swap'
• Swapping with production slot explicitly
• Misspelling 'deployment' or 'swap'

3. Given the following Azure App Service slots setup:

Production slot URL: https://myapp.azurewebsites.net
Staging slot URL: https://myapp-staging.azurewebsites.net

If you deploy a new version to the staging slot and then swap slots, what will be the URL of the new live app?

medium

A. https://myapp-staging.azurewebsites.net

B. https://myapp-live.azurewebsites.net

C. https://myapp-staging-live.azurewebsites.net

D. https://myapp.azurewebsites.net

Solution

1. Step 1: Understand slot URLs and swapping behavior

   Each slot has its own URL. When you swap staging with production, the staging app becomes live at the production URL.

2. Step 2: Identify the live app URL after swap

   After swapping, the new live app runs at the production slot URL https://myapp.azurewebsites.net. The staging URL remains for the old production app now in staging.

3. Final Answer:

   https://myapp.azurewebsites.net -> Option D

4. Quick Check:

   Swap keeps live URL as production slot URL [OK]

Hint: Live app URL stays production slot URL after swap [OK]

Common Mistakes:

• Assuming staging URL becomes live URL
• Thinking swap creates new URLs
• Confusing slot names with URLs

4. You tried to swap your staging slot with production but received an error saying the swap failed due to configuration conflicts. What is the most likely cause?

medium

A. The staging slot has app settings marked as 'slot setting' that differ from production

B. The staging slot is using a different Azure subscription

C. The production slot is stopped and cannot be swapped

D. The staging slot has no deployment

Solution

1. Step 1: Understand slot setting behavior during swap

   App settings marked as 'slot setting' stay with their slot and do not swap. Conflicts arise if these settings differ between slots.

2. Step 2: Analyze error cause possibilities

   The staging slot has app settings marked as 'slot setting' that differ from production explains configuration conflicts due to slot settings. Options B, C, and D do not cause swap configuration conflicts.

3. Final Answer:

   The staging slot has app settings marked as 'slot setting' that differ from production -> Option A

4. Quick Check:

   Slot setting conflicts cause swap errors [OK]

Hint: Check 'slot setting' app settings for conflicts before swap [OK]

Common Mistakes:

• Ignoring slot setting app configuration
• Assuming subscription mismatch causes swap errors
• Trying to swap when production is stopped

5. You want to minimize downtime during a major app update using deployment slots. Which strategy best achieves this?

hard

A. Deploy the new version to a staging slot, test it, then swap with production slot

B. Deploy directly to production slot during off-hours without staging

C. Create a new app service and switch DNS to it after deployment

D. Stop the production slot, deploy update, then start it again

Solution

1. Step 1: Understand deployment slots for zero downtime

   Deployment slots allow deploying and testing new versions without affecting live traffic, then swapping instantly to minimize downtime.

2. Step 2: Evaluate each strategy for downtime impact

   Deploy the new version to a staging slot, test it, then swap with production slot uses deployment slots correctly. Options A, B, and C cause downtime or complex DNS changes.

3. Final Answer:

   Deploy the new version to a staging slot, test it, then swap with production slot -> Option A

4. Quick Check:

   Use staging slot deployment and swap for minimal downtime [OK]

Hint: Deploy to staging slot, test, then swap to production [OK]

Common Mistakes:

• Deploying directly to production causing downtime
• Using DNS switch instead of slot swap
• Stopping production slot during update