Performing a Deployment Rollback with BuildMaster
We don't have a special "rollback plan" that's used only in
emergencies. Since such a plan would only get tested in rare cases (i.e. when something
went wrong), chances are it will be out of date and likely make things even worse.
But what we do have is a "Re-execute promotion", which can effectively be be used
to rollback changes. Assuming you have your deployment plan configured correctly. Let's consider the state of a given application.
You'll note below that Release 3.5 (Build 16) was deployed to Production.
Step 1: Navigate to Promotion Details
To go back to Release 3.4 in production, navigate to the promotion
details of the production-promoted build for that release.
Step 2: Click Re-execute Promotion
You'll notice there's a big button called "Re-execute Promotion". Clicking on that
will run the production deployment plan using 3.4 Build 2's context. Here's what
the plan looks like.
Step 3: Deploy the Artifact
The actions "Deploy Artifact" and "Deploy config files" are both designed to look
at the execution context to determine what to do. In this case, "Deploy
Artifact" will deploy the artifact associated with 3.4 Build 2. This will ensure
that whatever files were deployed with 3.4 Build 2 will always be deployed with 3.4
Once the build has been re-deployed, the appropriate status is reflected in BuildMaster.
And like that, your changes are rolled back. Of course, this isn't a time machine
and nothing (not even a time machine) can reliably and perfectly rollback all changes
while keeping existing data.
So, be careful using re-executions / rollbacks.