title: Define `become=yes' per role with Ansible
body: <p>In my system provisioning with Ansible, I don't want to specify <code>become=yes</code> in every task, so I created the following <em>ansible.cfg</em> in the project main directory, and Ansible automatically runs everything as root:</p>
  
  <pre><code>[privilege_escalation]
  become = True
  </code></pre>
  
  <p>But as the project kept growing, some new roles should not be run as root. I would like to know if it is possible to have some instruction inside the role that all tasks whithin that role should be run as root (eg. something in vars/), instead of the global <em>ansible.cfg</em> solution above!</p>