How to migrate an App Service to an availability zone

[simone-cw]

I could not find any information on how to migrate an existing App Service to take advantage of availability zones.
The only documentation I've found - Migrate App Service to availability zone support
- does not mention Azure PowerShell.
Is this not supported at all in the Azure PowerShell module? If not do you have any advice/workaround on how to automate this operation through PowerShell scripts?

[Alex-wdy]

Will involve app service to follow up on this issue.

[simone-cw]

Hi @Alex-wdy

Would you be able to clarify if I have to provide further information and what details are needed?

[seligj95]

@simone-cw - At this time, an existing App Service can not be migrated from single zone to Availability Zones. You will need to re-create your App Service plans and select Availability Zones during creation. This is a deployment time decision and can't be changed. To redeploy, you can use the clone feature (for Windows apps), backup and restore, or one of the manual options.

https://learn.microsoft.com/azure/app-service/app-service-web-app-cloning
https://learn.microsoft.com/azure/app-service/manage-backup?tabs=portal

[simone-cw]

@seligj95 as an alternative approach, is it feasible to create a new App Service Plan with Availability Zones enabled and then migrate an existing App Service to that plan without having to create a new App Service?

[seligj95]

If you're using the clone feature (which means your have a Windows App Service), then you don't need to pre-create the App Service in the zone redundant App Service plan. The backup and restore feature requires the new App Service to be created before restoring, but if you're using the portal, you can create the new App Service during the restore experience. Since it looks like you want to script this process, unless you're using Windows apps and the clone feature, you will need to pre-create the App Services in the new plan before migrating.

[simone-cw]

Hi @seligj95,

Is there a way to create a completely new zone redundant App Service Plan?
I suspect the answer is no as I coulnd't find any relevant parameter on the New-AzAppServicePlan command, but I would highly appreciate a confirm from the Az PowerShell team.
As we've sucessfully scripted every other step of our infrastructure setup, it would be great if we could also find a way to create a zone redundant App Service Plan without relying on the az cli or the Azure Portal.

[seligj95]

@simone-cw - I'll have to look into getting the zone redundant parameter added to New-AzAppServicePlan. In the meantime however, you can use the generic New-AzResource command and input the zoneRedundant property like below.

New-AzResource -Location "East US" -Properties @{zoneRedundant="true"} -ResourceName myAzAsp -ResourceType microsoft.web/serverfarms -ResourceGroupName myResourceGroup -Sku @{name="P1V2"} -Force

[simone-cw]

Thanks @seligj95 - much appreciated all your help.