Updates the parameter values for stack instances for the specified accounts, within the specified Amazon Web Services Regions. A stack instance refers to a stack in a specific account and Region.
You can only update stack instances in Amazon Web Services Regions and accounts where they already exist; to create additional stack instances, use
CreateStackInstances.
During StackSet updates, any parameters overridden for a stack instance aren't updated, but retain their overridden value.
You can only update the parameter
values that are specified in the StackSet. To add or delete a parameter itself, use
UpdateStackSet to update the StackSet template. If you add a parameter to a template, before you can override the parameter value specified in the StackSet you must first use
UpdateStackSet to update all stack instances with the updated template and parameter value specified in the StackSet. Once a stack instance has been updated with the new parameter, you can then override the parameter value using
UpdateStackInstances.
The maximum number of organizational unit (OUs) supported by a
UpdateStackInstances operation is 50.
If you need more than 50, consider the following options:
- Batch processing: If you don't want to expose your OU hierarchy, split up the operations into multiple calls with less than 50 OUs each.
- Parent OU strategy: If you don't mind exposing the OU hierarchy, target a parent OU that contains all desired child OUs.