A company accidentally deleted the private key for an Amazon Elastic Block Store (Amazon EBS)-backed Amazon EC2 instance. A security engineer needs to regain access to the instance.
Which combination of steps will meet this requirement? (Choose two.)
A . Stop the instance. Detach the root volume. Generate a new key pair.
B . Keep the instance running. Detach the root volume. Generate a new key pair.
C . When the volume is detached from the original instance, attach the volume to another instance as a data volume. Modify the authorized_keys file with a new public key. Move the volume back to the original instance. Start the instance.
D . When the volume is detached from the original instance, attach the volume to another instance as a data volume. Modify the authorized_keys file with a new private key. Move the volume back to the original instance. Start the instance.
E . When the volume is detached from the original instance, attach the volume to another instance as a data volume. Modify the authorized_keys file with a new public key. Move the volume back to the original instance that is running.
Answer: A C
Explanation:
If you lose the private key for an EBS-backed instance, you can regain access to your instance. You must stop the instance, detach its root volume and attach it to another instance as a data volume, modify the authorized_keys file with a new public key, move the volume back to the original instance, and restart the instance.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstancesConnecting.html#replacing-l
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