ISC2 Certified Cloud Security Professional (CCSP) Practice Question
Your organization hosts a mission-critical patient-records system in a private IaaS cloud. Compliance rules mandate that when a new application version is released, the existing production environment must stay intact until the upgrade is fully validated, and if problems arise the rollback must be immediate, with only a few seconds of user interruption. As the cloud security professional responsible for deployment management under ITIL, which deployment strategy best satisfies these requirements?
In-place rolling update across the existing production cluster
Canary release by gradually enabling new features behind feature flags on the same servers
Big-bang deployment during a scheduled maintenance window
Blue/Green deployment with traffic cutover via load balancer switch
A blue/green deployment keeps two identical production environments (blue and green). The new release is installed in the idle (green) environment while users continue to access the active (blue) one. After validation is complete, traffic is switched-often by updating a load balancer or DNS record-so users move almost instantaneously to the green environment. Because the original blue environment is left unchanged, reverting is as simple as directing traffic back, providing near-instant rollback and minimal downtime.
By contrast, an in-place rolling update replaces software on the live servers sequentially, so the old version is partially overwritten and rapid rollback is more complex. A big-bang cut-over requires a complete outage and offers no quick fallback. Canary releases use the same production fleet, so problems can still impact a subset of users and rollback involves redeploying code, which takes longer than a blue/green traffic switch.
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ISC2 Certified Cloud Security Professional (CCSP)
Cloud Security Operations
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