I'd like for roles which configure Node apps, to generate some snippets for
an HAProxy config. I'd like to be able to call the same role dependency,*
app_snippet*, in a generalized way, across many apps (app1, app2, etc.).
However, the dependency executes once, even though I am using the
*allow_duplicates:
yes* in the *meta/main.yml* for each app.
In short, I'd like role *app_snippet* to be completely data-driven and
called as a dependency of each *app*, and executed once for each *app*,
using *vars* from the calling *app* role.
Am I missing something fundamental with Variable scoping? Or is this an
anti-pattern in Ansible? The *allow_duplicates: yes* boolean seems to only
be in the scope of the calling app role, not global across roles.
PLAYBOOK: *apps.yml*
- name: install apps
hosts: webservers
roles:
- { role: app1 }
- { role: app2 }
ROLES:
roles/app1/
roles/app2/
roles/app_snippet/
ROLE appN: (i.e. app1 and app2 are mostly the same, for the purposes of
role dependency)
*roles/appN/vars/main.yml*
---
app: appN
install_dir: /opt/{{app}}
*roles/appN/meta/main.yml*
---
allow_duplicates: yes
dependencies:
- { role: app_snippet }
*roles/app_snippet/tasks/main.yml*
---
- name: HAProxy Backend Snippet {{app}}
template: src=haproxy_backend.cfg.j2
dest=/etc/haproxy/conf/backend.d/{{app}}.cfg
I only see the task *app_snippet | HAProxy Backend Snippet app1* execute. I
don't see it execute for *app2*.
The same is true (runs once) if I assign a static parameter to the
*app_snippet* role dependency for each app:
*roles/app1/meta/main.yml*
---
allow_duplicates: yes
dependencies:
- { role: app_snippet, app: app1 }
*roles/app2/meta/main.yml*
---
allow_duplicates: yes
dependencies:
- { role: app_snippet, app: app2 }
This suggests that it is not a variable scoping issue. But it does suggest
that late interpolation of variables causes the *app_snippet* tasks in both
calls to be considered "the same", and subsequently executed once.
Any help/pointers are appreciated! Thanks!
Robb
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