Multiple Azure Function App inside same app service plan

Abhay Gupta 71

Hello

We have a premium app service plan and we are planning to create multiple function app under it with each function app consisting of only 1 function.

I am not able to figure out all the scaling works and how the computing for resources happens. If I have want to scale 1 function app regardless of other can this happen or they will all scale.

If someone can provide guidance what is best way to identify how many function app we can have within an app service plan and how to scale each function app independently of others, it would really be helpful.

Thanks

1 answer

MayankBargali-MSFT 70,126 Reputation points

2021-05-17T13:23:23.283+00:00

Hi @Abhay Gupta

Welcome to Microsoft Q&A! Thanks for posting the question.

The functions scale document covers different scaling as per your hosting plan. If you create a function on the existing app service plan then the azure function will use the app service plan allocated resources to serve the request. If you are using Dedicated Plan then you can manual/autoscale scale-out as mentioned in the document. For consumption/premium plan it is an event-driven scale-out.

You should set autoscale on your app service plan based on different available metrics as per your requirement.
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Abhay Gupta 71 Reputation points

2021-05-19T01:06:13.69+00:00

Thank @MayankBargali-MSFT for the kind reply.

The point I am stuck and not able to clearly understand that If I have an

P1v1 app service plan and i put multiple function app under it , how does scaling happens that is if 1 function app is highly used and the other is low used if the scale the app service plan will it be applicable to both the function app and also does each of those function will have there own set of resources which app service plan provided?

If a take an elastic premium plan and have multiple function app under it how in this scenario it will work?

Also when we say instance it means complete resources of the plan? E.g if my plan is 2 cpu and 3.5 gb , 1 instance is 2 cpu and 3.5 gb?

Thanks for your help.

MayankBargali-MSFT 70,126 Reputation points

2021-05-21T10:55:48.827+00:00

@Abhay Gupta All the functions under the web app and premium plan will share the same set of resources and the function doesn't scale independently. In the case of a web app you define the scaling in azure app service. In elastic premium plan, the scaling works based on triggers please refer to this example mentioned here.

Instance means the dedicated Virtual machine (i.e. core, ram, storage). Web apps plan can have multiple instances running based on your configuration.

Ravi 1 Reputation point

2022-02-10T20:14:44.743+00:00

you need to create separate app service plan for each azure function app to scale independently. But this going to bit costly and you cannot stop or pause app service plan for cost saving, you simply need to delete it and to delete service plan you should not have function app in it. Though you have option for manually or automatic scale up and you can also change plan but in same tier.
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