``ws01.example.com`` is meant to run *Debian 9 Stretch* (althogh, Debian

   Jessie should function as well).

10. Add the SSH host fingerprints to your ``known_hosts`` file (don't forget to

    remove old entries if you are redoing the process). You can easily obtain all

    the necessary fingerprints with command (don't forget to modify domain if you

    need to):

    .. code-block:: shell

      ssh-keyscan -t ed25519 mail.example.com ldap.example.com xmpp.example.com web.example.com backup.example.com ws01.example.com $(resolveip -s mail.example.com) $(resolveip -s ldap.example.com) $(resolveip -s xmpp.example.com) $(resolveip -s web.example.com) $(resolveip -s backup.example.com) $(resolveip -s ws01.example.com)

11. Invoke the ``bootstrap.yml`` playbook in order to set-up some basic

    environment for Ansible runs on all servers:

    .. code-block:: shell

       ansible-playbook playbooks/bootstrap.yml

12. Finally, apply configuration on all servers:

    .. code-block:: shell

       ansible-playbook playbooks/site.yml