High Availability and DR

Question 1

What is a pilot light DR scenario?

Answer 1

A minimal always on environment running in the cloud

Question 2

What is a blue/green deployment and what AWS service uses it by default? How does this differ from an in place deployment? What must a blue/green deployment be run on conjunction with? (hint: Registration)

Answer 2

CodeBuild: In a blue/green deployment AWS Codebuild creates new instances and deploys the application on those. This must be done in conjunction with an ELB (any form of ELB). Old instances are deregistered with the ELB and new instances are registered.
An in place deployment deploys the application on to existing instances by stopping the application on each instance, deploying it and restarting.