Question

A SysOps administrator manages a fleet of standalone EC2 instances that run a legacy application not part of any Auto Scaling group. Occasionally an instance becomes unreachable due to a loss of network connectivity or a hardware issue on the underlying host, causing the instance system status check to fail. The administrator wants an automated action that recovers the affected instance while preserving its instance ID, private IP address, and any attached EBS volumes, with no additional custom code to maintain. Which solution meets these requirements?

Accepted Answer

Create a CloudWatch alarm on the StatusCheckFailed_System metric for each instance and configure the alarm to trigger the EC2 recover action.

Answer

Create a CloudWatch alarm on the StatusCheckFailed_Instance metric and configure the alarm to trigger the EC2 reboot action.

Answer

Create an EventBridge rule that invokes a Lambda function to terminate the instance and launch a replacement from an AMI.

Answer

Place the instances in an Auto Scaling group with a minimum and maximum capacity of one so unhealthy instances are replaced automatically.