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Difficulty: MediumConfigure Azure App Services

An administrator manages an Azure App Service web app named WebApp1 that runs on a Standard S1 App Service plan. You need to configure WebApp1 to scale out to a maximum of 15 instances based on CPU utilization. What should you do first?

  1. Scale up the App Service plan to a Premium tier.Answer
  2. B
    Configure an autoscale rule to scale out the App Service plan to 15 instances.
  3. C
    Scale up the App Service plan to the Basic B3 tier.
  4. D
    Configure a deployment slot and distribute the traffic using a traffic routing rule.

Answer

Scale up the App Service plan to a Premium tier.
Scaling up the App Service plan to a Premium tier is correct because the Standard tier enforces a maximum limit of 10 instances. To scale out to 15 instances, the App Service plan must first be scaled up to a Premium tier, which supports up to 20 or 30 instances.

Step-by-Step Solution

1
Determine the scale-out instance capacity requirements.
The target configuration requires scaling out to a maximum of 15 instances.
This establishes the minimum scale-out capacity requirement.
2
Identify the instance limit of the current App Service plan tier.
The current Standard S1 plan has a maximum limit of 10 instances.
This shows that the current tier cannot support the required 15 instances.
3
Determine the first configuration change required to meet the capacity.
Scale up the App Service plan to a Premium tier, which supports 20 or 30 instances.
Changing the pricing tier (scaling up) must occur first to raise the instance limit before the scale-out rule can function.

Key Concept

Azure App Service plan scaling limits and the difference between scaling up (changing the pricing tier) and scaling out (increasing the instance count).
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Topics

Configure Azure App Services

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