GCP Professional Cloud Architect Practice Question
You need to introduce chaos engineering into a mission-critical retail platform that runs on managed instance groups in two regions and receives thousands of orders per minute. Leadership insists that the first experiment be run in production but must not cause customer-visible disruption. Which approach best follows accepted chaos engineering principles while still providing useful resilience data?
Simulate a full outage by disabling all resources in one production region simultaneously.
Inject 30% packet loss into one backend service of the global HTTP(S) load balancer during peak sales traffic.
Randomly cordon and shut down every node in a Kubernetes node pool that spans multiple regions.
Terminate a single non-critical VM in a zonal managed instance group with an automated script during a planned maintenance window.
A sound chaos engineering experiment begins by forming a hypothesis about normal behaviour, limiting the blast radius, and injecting a small, well-understood failure so that the team can observe the system's response and improve it safely. Terminating a single, non-critical zonal VM that is part of an autoscaled managed instance group during a maintenance window keeps the scope minimal and contains any impact, yet still validates that auto-healing, load balancing, and retry mechanisms work as expected. Injecting network faults at peak load, shutting down an entire node pool, or disabling a whole region ignores the guideline to start small and creates an unacceptably high risk of customer impact.
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