Amazon Linux 2 10/31/2018 release notes
These are release notes for Amazon Linux 2.
Major updates
The OpenSSH daemon configuration file /etc/ssh/sshd_config has been updated. The AuthorizedKeysCommand value is configured to point to a customized script, /opt/aws/bin/curl_authorized_keys to support an upcoming feature to read SSH public keys; from the EC2 instance metadata during the SSH connection process.