Microsoft DevOps Engineer Expert AZ-400 Practice Question

You operate a mission-critical Azure App Service web app that uses a production slot and a staging slot named "green". A multi-stage Azure Pipelines YAML pipeline already builds and deploys the new version to the green slot. Compliance rules state that:

traffic must be shifted to the new version without any measurable downtime,
an automated health-check endpoint (/health) must be called before live traffic is routed,
if the health check fails, the swap must be cancelled automatically.

You need to add a job to the pipeline that performs the slot swap while meeting the compliance rules. Which pipeline task and configuration should you use?

Add an AzureAppServiceManage task, set its action to Swap Slots, and enable the Swap with preview option.
Add an AzureCLI@2 task that runs az webapp deployment slot swap --slot green --target-slot production.
Add an AzureTrafficManager task that gradually shifts 100% of traffic from the green slot to the production slot.
Add an AzureAppServiceDeploy task configured for the production slot and set the deployToSlotOrASE input to true.

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Answer Description

The AzureAppServiceManage task's 'Swap Slots' action includes a 'Swap with preview' option. When this option is enabled, the task first applies the production slot's configuration to the staging slot and warms up the application. It then automatically calls the health check endpoint. If the health check is successful, it completes the swap by redirecting production traffic. If the health check fails, the task automatically cancels the swap, reverting the staging slot's configuration. This process ensures zero downtime and meets the compliance requirements for an automated health check and rollback. The standard 'Azure App Service deploy' task does not include this integrated swap logic. Using the Azure CLI would require custom scripting for the health check and rollback, which is less efficient than the built-in task functionality.

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