You are a Devops Engineer for your company. Your company is using Opswork stack to rollout a collection of web instances. When the instances are launched , a configuration file need to be setup prior to the launching of the web application hosted on these instances. Which of the following steps would you carry out to ensure this requirement gets fulfilled. Choose 2 answers from the options given below

Answer options:

A.Ensure that the Opswork stack is changed to use the AWS specific cookbooks
B.Ensure that the Opswork stack is changed to use custom cookbooks
C.Configure a recipe which sets the configuration file and add it to the Configure LifeCycle Event of the specific web layer.
D.Configure a recipe which sets the configuration file and add it to the Deploy LifeCycle Event of the specific web layer.

Answer - B and C
This is mentioned in the AWS documentation
Configure
This event occurs on all of the stack`s instances when one of the following occurs:
An instance enters or leaves the online state.
You associate an Elastic IP address with an instance or disassociate one from an instance.
You attach an Elastic Load Balancing load balancer to a layer, or detach one from a layer.
For example, suppose that your stack has instances A, B, and C, and you start a new instance,
D. After D has finished running its setup recipes, AWS OpsWorks Stacks triggers the Configure event on A, B, C, and
D. If you subsequently stop A, AWS OpsWorks Stacks triggers the Configure event on B, C, and
D. AWS OpsWorks Stacks responds to the Configure event by running each layer`s Configure recipes, which update the instances` configuration to reflect the current set of online instances. The Configure event is therefore a good time to regenerate configuration files. For example, the HAProxy Configure recipes reconfigure the load balancer to accommodate any changes in the set of online application server instances.
You can also manually trigger the Configure event by using the Configure stack command.
For more information on Opswork lifecycle events, please refer to the below URL:
http://docs.aws.amazon.com/opsworks/latest/userguide/workingcookbook-events.html