My apps listed under my app service plan have disappeared

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My apps listed under my app service plan have disappeared

Marc Arlt 25

I am trying to consolidate 2 app service plans (Service Plan A has 13 apps on it and Service Plan B has 8 apps). They were on different resources so as a first step I moved Plan B onto the same resource group as plan A. Took a few minutes but it was moved successfully. My first problem: when I go onto Plan B, I see there are 8 apps on it, but when I click on apps there is nothing there? When I look at an app that is running on Plan B, it is still listed as being hosted on that app service plan which is expected since I haven't changed it. Second problem: I try and move that app to Plan A, but it is not listed under available options. I am only offered the opportunity to create a new app service plan. Plan A and Plan B are located in the same geo location, and both on the same resource. Why can't I change it? Can anyone help?

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Answer 1

@Marc Arlt TP is correct, the underlying webspaces are different so you won't be able to move them around using the default tools. In these cases, you'll need to manually deploy the web apps into a single ASP.

I would advise against this though. Trying to run 21 web apps on a single ASP could start to push the limits. Each web app requires its own overhead processes. Also, if you use deployment slots, each of those are technically a web app with their own overhead processes so you may have more than 21 web apps. Each web app is different so there is no guidance on the maximum number of web apps but when I was a support engineer 20 was a common number for an S1 tier web app to start having performance issues and requiring the customer to move a few web apps into a second ASP to avoid availability issues due to resources being stressed.

My point is that you might be taking on an expensive endeavor in terms of time only to have to undo it depending on the size of your ASP instance and your web apps resource requirements. I would ensure you do significant research to understand how both your current ASP's are behaving in terms of resources before moving forward.

I hope this adds some further insights into what TP has already shared. Please let us know if you have any further questions or concerns.

Also, we noticed that you provided a low survey rating. Please note that TP is correct and we ask that you provide surveys based on your experience on here provided by the community or Microsoft Engineers. This is not an appropriate place to provide survey ratings for product issues or shortcomings. Please consider taking a new survey that recognizes the time the community has taken to assist you and provide clarity on your matter. We are here to assist you so if you have more questions, let us know by replying to this message. Our goal is ensure all of your questions are answered.

Marc Arlt 25 Reputation points

2024-01-29T09:34:19.3366667+00:00

Hi, thanks for your explanation and for sharing your experience with it. I will definitely be giving it some extra thought before embarking on what looks like could be a lot of work.

Answer 2

TP 126.2K Volunteer Moderator

Hi Marc,

In order to consolidate you will need to create a new resource group in same region and redeploy all of apps/settings to it. When creating the first one (which will create new App Service Plan) you should select the SKU you need.

Scale up from an unsupported resource group and region combination

https://learn.microsoft.com/en-us/azure/app-service/app-service-configure-premium-tier#scale-up-from-an-unsupported-resource-group-and-region-combination

Please click Accept Answer and upvote if the above was helpful.

Thanks.

-TP

Marc Arlt 25 Reputation points

2024-01-26T10:42:36.9333333+00:00

Hi TP, Thanks for your reply. That doesn't work. When I create a new App Service Plan (C) I can move all Plan B to C but not A to C. They are all on the same resource group and the same geo location. I should also say that all of my service plans (A, B, and C) all have Premium V3 options.
TP 126.2K Reputation points Volunteer Moderator

2024-01-26T10:59:07.29+00:00

Hi Marc,

I'm not saying move. I'm saying, re-create them. In other words, I meant new resource group, new app service plan, new web apps.

When you have an App Service Plan in a resource group, moving it to a different resource group doesn't change the underlying Webspace (aka Deployment Unit) they are in.

If I understand you current configuration correctly most likely you only have to recreate all the apps of one of the two plans (leaving one plan as-is on same webspace). This would be less work than my initial suggestion.
Marc Arlt 25 Reputation points

2024-01-26T14:27:43.3766667+00:00

Hi TP,

Thanks again for your quick reply. This sound completely crazy to me. Surely there must be a way to migrate existing app services from one plan to another without having to create a bunch of resources from scratch!? There are a bunch of deploy scripts connected with each of these app services, and app secrets which will need to be re-created as well. The strange thing is that the apps (all in Plan B) I have managed to successfully migrate to the new plan (C) were created in the same Resource group as plan A, but I can't migrate the App Services in Plan A to Plan C (again, same original resource group and same geo location). I find it incredibly hard to believe that Microsoft has no way other than recreate everything...
Marc Arlt 25 Reputation points

2024-01-26T14:36:44.8933333+00:00

Hi TP, Thanks again for your quick reply. I find it very difficult to believe that the only way to move app services from one plan to another is to delete and recreate them (bear in mind that each app service has a git deploy connected to it with deploy secret which would also need to be recreated). This seems like total madness. The strange thing is the apps from plan B can be migrated to the new plan C (which was newly created in the same resource group and geo location as plan A) without a problem, but the app services from plan A - which, again, exists in exactly the same resource group and location - cannot be moved across. Why!? There must be another way other than simply delete and recreate...
TP 126.2K Reputation points Volunteer Moderator

2024-01-26T15:39:17.74+00:00

The limitations you are experiencing are due to the underlying webspace that the app service plans exist in. If app service plans are in different webspaces, there isn't a way to move their app(s) from one plan to the other. Once an App Service Plan is created, you cannot move it to a different webspace. This is similar limitation you run into for other resources in Azure. For example, say you have a VM in availability zone 1 and you would like it to be in availability zone 2 (where you have several other VMs). You can't simply go to the portal and switch it to zone 2.
Marc Arlt 25 Reputation points

2024-01-29T09:32:17.42+00:00

Hi TP, thanks for that. That makes sense, even if it is a frustrating limitation. Appreciate your assistance and explanation!

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My apps listed under my app service plan have disappeared

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