How best we can use the Rollback and RollbackAlways mechanism in Visual Studio Release Management Template

Hello All,
We need a clarification on Rollback and RollbackAlways in Release template.
We checked a scenario for Rollback and RollbackAlways:
In Release Template, we have the first activity as “Configure Application Pool” and then followed by a rollback action of “Create Application Pool”
and “Create Web Site” then followed by "Code Deployment" via TFS build.
We tested with 2 scenario’s:
With App Pool and Web Site already existing: when triggered the build, configure
app pool succeeded, then Rollback action was skipped (as previous action was successful), finally deploy the code executed (code deployed) and build got succeeded.
Deleted App Pool and Web Site: when triggered the build, configure app pool failed (as no app pool existed), Rollback action executed (as previous action failed) – created app pool and web site then finally
deploy the code executed (code deployed)
But build failed (Error: Configure app pool action failed).
Ideally the build should succeed as the roll back action got executed and code deployed successfully.
Please correct us if our understanding is wrong.
Also, Kindly let us know how best we can use the Rollback and RollbackAlways mechanism in Release Management
Looking forward for your positive response.
Thanks in advance.
Regards,

Hi Shashank,
Rollback Always runs if any of the actions in the template failed. Rollback will run if action just above rollback fails or if any of the actions below the Rollback fails.
Article here (http://www.incyclesoftware.com/2014/03/understanding-rollbacks-release-management/) clearly explains how Rollback and Rollback
Always work.
I think you come across this issue since you are using build to do the "code deployment" action. You should use the release template to do that.
As far as I know you cannot use Rollback to achieve condition check (App pool exist in your case) action.
For this you can create your own Power Shell component (which checks if the app pool exist and is not create it) and add it as a tool in RM server (RM Server Inventory).
Another option is you can follow the workaround in below thread "Answer" quoted below. That is execute Remove app pool regardless if it exist or not (which does not fail) and then create app pool.
I was able to get it working by removing the app pool which does not fail if it doesn't exist. Removing then creating seems the long way around but it works.
Flow:
Remove Application Pool
Create Application Pool
https://social.msdn.microsoft.com/Forums/en-US/43bf21c8-e233-4e58-a5a8-2592b78bc466/vs-2013-release-management-create-application-pool-fails-if-it-already-exists?forum=tfsbuild
Cheers!
Chaminda

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How best we can use the Rollback and RollbackAlways mechanism in Visual Studio Release Management Template

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