Exam AZ-400 topic 7 question 19 discussion

HOTSPOT -
You are designing YAML-based Azure pipelines for the apps shown in the following table.

You need to configure the YAML strategy value for each app. The solution must minimize app downtime.
Which value should you configure for each app? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:

Suggested Answer:
App1: rolling -
A rolling deployment replaces instances of the previous version of an application with instances of the new version of the application on a fixed set of virtual machines (rolling set) in each iteration.

App2: canary -
Canary deployment strategy is an advanced deployment strategy that helps mitigate the risk involved in rolling out new versions of applications. By using this strategy, you can roll out the changes to a small subset of servers first. As you gain more confidence in the new version, you can release it to more servers in your infrastructure and route more traffic to it.
Incorrect Answers:
runonce:
runOnce is the simplest deployment strategy wherein all the lifecycle hooks, namely preDeploy deploy, routeTraffic, and postRouteTraffic, are executed once.
Then, either on: success or on: failure is executed.
Reference:
https://docs.microsoft.com/en-us/azure/devops/pipelines/process/deployment-jobs