https://tecadmin.net/how-to-enable-ssh-as-root-on-aws-ubuntu-instance/
sudo service ssh reload
/etc/ssh/sshd_config
authorized_keys
no-port-forwarding,no-agent-forwarding,no-X11-forwarding,command="echo 'Please login as the user "admin" rather than the user "root".';echo;sleep 10" ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC7cyhhhowluDtBnq3cw6opWeuD/AtwFWguGzwKwRZdlGjsNEv7hrsYeee6Cd82B8/pYdXX/e1Lg02hrmBnunvaB/BZD1Kb7IGvzplOjeJiaFqQvW6QMyWd1pt7ZiHmzyZ0uEBgBsgnblBink+25xqAb8gJD5fHVdzT8aEP8M3gs3dMScfhbxWIPC/a8cyzQ/8khNPdyQtaC0eEmXUHGhNsWnDmQv47lDaKjMi+AsoRxrtceGokWg6a9D/IGsxtKFMkMB/RM83UH/Yjcw9HxQPcKDUWEnnhMPGGGuPwQmikDdsipOT7RzFQZhF2MgNp7dwcnpxzp/sT1KW54L6ZjELP id_rsa