Stop the instance. Detach the root volume. Generate a new key pair.

Keep the instance running. Detach the root volume. Generate a new key pair.

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.

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.

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.