1Z0-1072-25 Question 42
Single answerYou are the lead architect for a 24/7 online retail platform running on Oracle Cloud Infrastructure (OCI). You must schedule a maintenance window to patch the operating systems on your pool of Compute instances, all of which are behind an OCI Load Balancer. To ensure minimal disruption to customer traffic, which approach should you use?
- A
Take all instances offline at once, apply patches, and then bring them back online simultaneously
- B
Patch one instance at a time, removing each instance from the load balancer� backend set before patching it
- C
Terminate existing instances, launch new patched instances, and rely on automatic traffic rerouting
- D
Configure the instances to automatically reboot after the patch without removing them from the load balancer
Show answer and explanation
Correct answer: B
Explanation
The key principle in OCI infrastructure maintenance is to minimize downtime by using rolling or phased maintenance. By removing one Compute instance at a time from the load balancer, patching it, and then returning it to service, you significantly reduce the impact on your end users. This approach aligns with Oracle Cloud Infrastructure best practices outlined in official documentation for maintenance of highly available environments.
- A. Incorrect.
Option 1: Taking all instances down at once creates a full outage, which is not optimal for a 24/7 platform. While this might minimize the number of maintenance events, it fails to minimize downtime.
- B. Correct.
Option 2: This is correct. By patching one instance at a time and removing it from the load balancer� backend set during patching, you keep the remaining instances running and serving user traffic. Once patched, you can place the instance back in service without incurring significant downtime.
- C. Incorrect.
Option 3: While replacing instances can be a valid strategy for certain deployments (especially when using autoscaling or immutable infrastructure), completely terminating all existing instances at once introduces unnecessary risk and downtime in a continuous-availability scenario. Patching them in place is more controlled and less disruptive for such a 24/7 operation.
- D. Incorrect.
Option 4: Automatically rebooting instances mid-traffic without removing them from the load balancer poses a high risk of interrupting active sessions. This approach could lead to dropped connections and service disruption.