#cloud-config
users:
  - name: root
    ssh_authorized_keys:
      - ${SSH_RSA}
bootcmd:
  - sed -i -E 's/#?PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config
  - sed -i -E 's/#?PermitEmptyPasswords no/PermitEmptyPasswords yes/' /etc/ssh/sshd_config