6.2

The rollback script runs on the components whose properties are changing and the other dependent
nodes. For example, in a deployed Clustered Dukes Bank App, when you modify the configuration of the
MySQL port number from 3306 to 3307, the rollback script runs on the mysql service and
dukes_bank_app component. If this update process failed, you can rollback the configuration update to
revert to the previous port value 3306. In the Rollback wizard, you can view the Current Value as 3307
and the Rollback to value as 3306. The rollback script runs on the mysql service and dukes_bank_app
component to complete the process.
You define the ROLLBACK life cycle stage script for a dependent service or application component during
the initial application deployment. You can also add or modify the rollback scripts when you rollback an
update process to modify a configuration.
Prerequisites
n
Log in to Application Services as an application publisher and deployer.
n
Familiarize yourself with the basic concepts of defining and configuring component properties and
actions. See Chapter 12 Developing Application Services Components.
n
Verify that the initial deployment is successfully deployed to a cloud environment.
Procedure
1 On the Application Services title bar, click the drop-down menu and select Deployments.
2 Select an application deployment to rollback to a previous successful state.
3 From the Operations drop-down menu in the toolbar, select Rollback.
4 Click the blueprint image to review the highlighted dependencies between services or application
components.
Note all of the dependent components so that you can create a rollback script if one does not exist or
modify an existing one.
5 From the Service or Application Component tab, modify the applicable properties and rollback
script.
If the ROLLBACK life cycle stage is defined, then the script appears with the associated service or
application component. You must create a rollback script for the changes and rollback to component.
In the case of a clustered node, if you modify a property of a service or an application component, the
changes are applied to all the nodes of the cluster.
If you update the configuration properties of a deployment that was triggered by a change in the
external service instance, you cannot rollback these updated properties.
6 (Optional) Select the Reboot check box if the agent must restart the virtual machine after the rollback
script runs successfully and click Next.
The rollback tasks of the changed and rollback to components appear in the execution plan. The
original execution plan does not appear during an rollback process.
Using Application Services
VMware, Inc. 209