https://serversforhackers.com/an-ansible-tutorial
http://allican.be/assets/client-server-presentation/client-server%20model.pdf
http://docs.ansible.com/ansible/intro_inventory.html
https://devops.com/provisioning-vs-configuration/
https://blog.xebialabs.com/2010/12/20/deployment-automation-vs-server-provisioning/