EC2 Instance Status Checks and Auto Recovery Flashcards
What are EC2 Instance Status Checks?
EC2 Instance Status Checks are automated checks that monitor and evaluate the underlying hardware and software of your running EC2 instances to ensure they are operating as expected.
How many types of status checks are there?
There are two types of status checks: System Status Checks and Instance Status Checks. System Status Checks monitor the AWS infrastructure hosting your instance, while Instance Status Checks monitor the software and network configuration of your individual instance.
What actions can be taken if an instance fails a status check?
If an instance fails a status check, you can stop and start the instance, which migrates it to a new host in the case of System Status Checks, or you can troubleshoot the instance’s software or network configuration for Instance Status Checks.
What is Auto Recovery for EC2 Instances?
Auto Recovery is an Amazon EC2 feature designed to increase instance availability. When an instance becomes impaired due to an underlying hardware failure, Auto Recovery can automatically recover the instance on a new host with minimal disruption.
How is Auto Recovery set up for an EC2 instance?
Auto Recovery can be set up by creating an Amazon CloudWatch alarm. This alarm monitors an EC2 instance and automatically triggers the recovery action if the instance becomes impaired due to hardware issues.
What are the prerequisites for an instance to be eligible for Auto Recovery?
Instances must be in an Auto Recovery supported instance family, use EBS-backed volumes, and be within an Auto Recovery-supported Availability Zone. Also, there must be sufficient capacity and the instance type must be supported.
What are the benefits of using Auto Recovery for instances?
Auto Recovery helps reduce downtime for your critical applications by automatically recovering from underlying hardware failures, thus improving resilience and availability without manual intervention.
Can Auto Recovery move an instance to a different Availability Zone?
No, Auto Recovery will attempt to recover the instance in the same Availability Zone. It does not migrate instances across Availability Zones.
What happens to the instance’s public IP address during Auto Recovery?
During Auto Recovery, the instance’s public IP address will change unless it has an Elastic IP address associated with it. Elastic IP addresses are reassociated with the instance post recovery.
How can you monitor the Auto Recovery process?
You can monitor the Auto Recovery process through Amazon CloudWatch alarms. CloudWatch will send notifications when the recovery process is triggered and when it completes.
