CV0-004 Operations and Support Practice Question
A cloud engineer is configuring an auto-scaling group with a lifecycle hook to run a custom script when instances are launched. The script installs software and registers the instance with a load balancer. The engineer wants to ensure the instance does not receive traffic until the script completes successfully. What should the engineer do?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a lifecycle hook with a 'pending:wait' state and then send a 'complete-lifecycle-action' signal after the script succeeds.
Lifecycle hooks pause the instance launch process until you complete an action and notify the auto-scaling group to continue. By setting the hook to 'pending:wait', the instance remains in a pending state and does not become healthy until you send a 'complete-lifecycle-action' signal.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set the lifecycle hook to 'terminating:wait' to delay termination.
Why it's wrong here
Terminating hooks are for instance termination, not launch.
- ✓
Use a lifecycle hook with a 'pending:wait' state and then send a 'complete-lifecycle-action' signal after the script succeeds.
Why this is correct
This pauses the instance in a pending state until the custom action completes, preventing traffic until ready.
- ✗
Configure the load balancer health check to fail until the script runs.
Why it's wrong here
While this could work, it is not a best practice; lifecycle hooks provide a more reliable mechanism.
- ✗
Configure the launch configuration with a user-data script that runs after the instance is in service.
Why it's wrong here
User data scripts run after the instance starts, but the instance may be marked healthy and receive traffic before the script completes.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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