--- #YAML start syntax (optional) 

centos8:
    hosts:
       www8.dmz.nausch.org:
           ansible_ssh_host: 10.0.0.90
           ansible_ssh_port: 22
           #ansible_ssh_user: ansible
           ansible_ssh_private_key_file: /home/django/.ssh/id_ed25519_ansible

centos7:
    hosts:
       www7.dmz.nausch.org:
           ansible_ssh_host: 10.0.0.97
           ansible_ssh_port: 22
           #ansible_ssh_user: ansible
           ansible_ssh_private_key_file: /home/django/.ssh/id_rsa_ansible

... #YAML end syntax