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AWS Certified Solutions Architect study material · question 175 of 500

An application process hangs but the EC2 instance still passes its system checks. What lets Auto Scaling replace it?

  1. Attaching a second security group
  2. A custom health check that verifies the application is responding
  3. Raising the group's minimum size
  4. Enabling cross-zone load balancing
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Answer: B. A custom health check that verifies the application is responding

Custom health checks test application-level behaviour, and an instance failing one is replaced automatically to hold the desired capacity.

Source: What is Amazon EC2 Auto Scaling? (Amazon Web Services) — Custom health checks

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