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You develop and deploy an Azure App Service API app to a Windows-hosted deployment slot named Development.
You create additional deployment slots named Testing and Production.
You enable auto swap on the Production deployment slot.
You need to ensure that scripts run and resources are available before a swap operation occurs.
Solution: Disable auto swap.
Update the app with a method named statuscheck to run the scripts.
Re-enable auto swap and deploy the app to the Production slot.
Does the solution meet the goal?
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A. B.B.
Instead update the web.config file to include the applicationInitialization configuration element.
Specify custom initialization actions to run the scripts.
Note: Some apps might require custom warm-up actions before the swap.
The applicationInitialization configuration element in web.config lets you specify custom initialization actions.
The swap operation waits for this custom warm-up to finish before swapping with the target slot.
Here's a sample web.config fragment.
<system.webServer> <applicationInitialization> <add initializationPage="/" hostName="[app hostname]" /> <add initializationPage="/Home/About" hostName="[app hostname]" /> </applicationInitialization> </system.webServer> Reference: https://docs.microsoft.com/en-us/azure/app-service/deploy-staging-slots#troubleshoot-swaps.
The proposed solution seems to be incorrect and does not meet the goal of ensuring that scripts run and resources are available before a swap operation occurs.
Disabling auto swap will prevent automatic swapping of the slots when a new deployment is made. However, this does not guarantee that scripts will run or that resources will be available before the swap operation. Disabling auto swap also means that manual intervention will be required to perform the swap, which may not be desirable.
Updating the app with a method named statuscheck to run the scripts is a good step, as it will allow you to check the status of the resources and scripts before the swap operation. However, simply updating the app with this method is not enough. You also need to ensure that this method is executed before the swap operation occurs.
To accomplish this, you can use deployment slots' pre-swap and post-swap hooks. The pre-swap hook allows you to execute a script or method before the swap occurs, while the post-swap hook allows you to execute a script or method after the swap occurs. By using these hooks, you can ensure that the statuscheck method is executed before the swap occurs.
Therefore, the correct solution should be to:
This solution will ensure that the statuscheck method is executed before the swap operation, which will help to prevent any issues that may arise due to incomplete or unavailable resources or scripts.