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R

Red/Black deployment:
- a lot like Blue/Green deployment, but only one of the versions ever gets traffic at any point in time.
- Compare Rolling updates
RIS = Resilient IT Strategy
Role: in IAM, the object of a policy
- is a collection of permissions
- Compare Principal
Rolling updates:
- A subset of application instances, instead of all of them, is upgraded at the same time.
- This method requires no downtime.
- Compare: Blue/Green deployment, Red/Black deployment
RPO = Recovery Point Objective.
- The quantity of data that can be acceptably lost during an incident
- Compare: RTO
RTO = Recovery Time Objective
- The maximum unavailability duration for an application, not necessarily meaning data loss, but also including time to restore
- Compare: RPO