Question

A CloudOps engineer manages a fleet of EC2 instances running a legacy monolithic application that stores state on the instance's local root volume. Occasionally, an underlying host experiences a hardware failure, causing the instance to become unreachable. The team wants an automated way to recover the affected instance while preserving its instance ID, private IP address, Elastic IP, and attached EBS volumes, without launching a replacement instance. What should the engineer configure?

Accepted Answer

Create a CloudWatch alarm on the StatusCheckFailed_System metric with an EC2 action to recover the instance.

Answer

Create an Auto Scaling group with a minimum and maximum capacity of one so that a failed instance is replaced automatically.

Answer

Create a CloudWatch alarm on the StatusCheckFailed_Instance metric with an EC2 action to reboot the instance.

Answer

Create an EventBridge rule matching EC2 instance state-change events that triggers a Lambda function to launch a new instance from an AMI.