AWS Certified Solutions Architect – Professional SAP-C01 – Question318 - AWS Certified Solutions Architect

A user is using CloudFormation to launch an EC2 instance and then configure an application after the instance is launched. The user wants the stack creation of ELB and AutoScaling to wait until the EC2 instance is launched and configured properly.
How can the user configure this?

A. The user can use the DependentCondition resource to hold the creation of the other dependent resources.
B. It is not possible that the stack creation will wait until one service is created and launched.
C. The user can use the HoldCondition resource to wait for the creation of the other dependent resources.
D. The user can use the WaitCondition resource to hold the creation of the other dependent resources.

Correct Answer: D

Explanation:

Explanation: AWS CloudFormation is an application management tool that provides application modeling, deployment, configuration, management, and related activities. AWS CloudFormation provides a WaitCondition resource that acts as a barrier and blocks the creation of other resources until a completion signal is received from an external source, such as a user application or
management system.
Reference:
http://aws.amazon.com/cloudformation/faqs