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On the Ansible best practices page: http://docs.ansible.com/ansible/playbooks_best_practices.html#top-level-playbooks-are-separated-by-role it shows an example where the master playbook site.yml includes a couple of other top-level playbooks webservers.yml and dbservers.yml. Within those playbooks they each include the common role. Some inventory files I have all my groups run on one single host. Another inventory file I have a host per group. For the case where ever group is on one host, if I run site.yml you can see that the common role is getting played twice, one for webservers.yml and one for dbservers.yml.
What is a solution to avoid this? I guess you can take out the common role from webservers.yml and dbservers.yml and instead within site.yml have a task that targets both with the common role. But then I can not individually provision a webserver or dbserver with common.
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The host_vars is a similar folder to group_vars in the repository structure. It contains data models that apply to individual hosts/devices in the hosts. ini file. Hence, there is a YAML file created per device containing specific information about that device.
Ansible will look here when we want to use our new role in a playbook later in this tutorial. Within this directory we will define roles that can be reused across multiple playbooks and different servers. Each role that we will create requires its own directory.
I determine role dependencies using meta files in my role directory. Role dependencies allow you to automatically pull in other roles when using a role. Role dependencies are stored in the meta/main.yml file contained within the role directory.
Roles dependencies are always executed before the role that includes them, and are recursive. By default, roles can also only be added as a dependency once - if another role also lists it as a dependency it will not be run again. This behavior can be overridden by adding allow_duplicates: yes to the meta/main.yml file.
See an example in the Ansible documentation.
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