Microsoft Azure Essentials Fundamentals of Azure Second Edition e-optimized 5x11 pdf



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9781509302963 Microsoft Azure Essentials Fundamentals of Azure 2nd ed pdf

Scaling by CPU Percentage 
Let’s take a look at the CPU Percentage scale settings, shown in Figure 2-35. 


64 
CHAPTER 2 |  Azure App Service and Web Apps 
 
 
Figure 2-35  Scale by CPU Percentage.  
This will allow you to scale up or down depending on the CPU Percentage. You can set the lowest 
number of instances and the highest number of instances as well as the CPU Percentage value where 
you want the autoscaling to occur. In the case displayed in Figure 2-35, the web app will run on a 
minimum of two instances and a maximum of six instances. The autoscaling uses standard Microsoft 
Insights autoscaling, creating an upper and lower bound rule that you can view using the Resource 
Explorer in the Microsoft.Insights resource for the App Service. It waits 10 minutes between each 
scaling action.  
In our case here, when the CPU Percentage reaches 80 percent and stays there for at least 10 minutes, 
it will start scaling up the instances until the CPU Percentage is below the limit or it reaches the 
maximum number of instances. When the CPU Percentage is below the limit, it will scale down until it 
reaches the minimum number of instances.  
Note  When talking about autoscaling, the average CPU percentage used to scale up or down is 
the average across all of the VMs running in that App Service plan. This is also true for the other 
metrics you can use. 
You can also set up notifications so it will email you when it starts scaling up and configure a 
webhook to be run. Webhooks allow you to route the notification to other systems. For example, you 
could have a service that sends you an SMS message when the scaling begins.  


65 
CHAPTER 2 |  Azure App Service and Web Apps 
 

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