If I understand your question correctly, then why not just have two 
playbooks? We have an infrastructure.yml playbook which provisions a server 
for us. We also have another playbook which makes alterations to that 
server dependent on its role. For example, in our case when we provision a 
Jenkins server, I run the infrastructure.yml playbook which targets all 
servers (qa-machines in your case) in its host specification (remember that 
you can use ansible's limit 
<http://docs.ansible.com/ansible/playbooks_best_practices.html#top-level-playbooks-are-separated-by-role>
 
attribute to narrow the scope of the playbook from the command line) and 
then I run jenkins.yml afterwards which targets just the jenkins server 
(jenkins-slaves in your example).

On Wednesday, 26 October 2016 16:28:45 UTC+1, [email protected] wrote:
>
> Hello, 
> How to best model the following scenario:
>
> I have a set of hosts in one playbook.
>
> [qa-machines]
> HostA
> HostB
> HostC
>
> I have a subset of these hosts that should receive additional roles.
>
> [jenkins-slaves]
> HostC
>
> I have a Vagrantfile that I would like to use to set up one host of each 
> category.
>
> Including first playbook from the second one does not work, because I 
> cannot parameterize the hosts when including a playbook.
>
> What I would like to achieve is, when the "setup-qa-machine" playbook is 
> changed, it does not require to change in the "setup-jenkins-slave" 
> playbook, which would be the case if I repeated the common roles.
>
> it feels a bit like I was not seeing the obvious right now, so any help is 
> appreciated. Thanks!
>

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