The company runs a complex customer system and consists of 10 different software components all backed up by RDS. You adopted Opswork to simplify management and deployment of that application and created a stack and layers for each component. A security policy requires that all instances should run on the latest AMI and that instances must be replaced within one month after the latest AMI has been released. AMI replacements should be done without incurring application downtime or capacity problems. You decide to write a script to be run as soon as the new AMI is released. Choose 2 options which meet your requirements:
A. Assign a custom recipe to each layer which replaces the underlying AMI. Use OpsWorks life-cycle events to incrementally execute this custom recipe and update the instances with the new AMI.
B. Specify the latest AMI as the custom AMI at the stack level terminates instances of the stack and let OpsWork launch new instances with the new AMI.
C. Identify all EC2 instances of your OpsWork stack, stop each instance, replace the AMI ID property with the latest AMI ID, and restart the instance. To avoid down time, make sure no more than one instance is stopped at the same time.
D. Create a new stack and layers with identical configuration, add instances with the latest AMI specified as a custom AMI to the new layers, switch DNS to the new stack, and tear down the old stack.
E. Add new instances with the latest Amazon AMI as a custom AMI to all OpsWork layers of your stack and terminate the old ones.
