I have a patch locally that enables pre and post processing for roles.
The directory names are pre_tasks and post_tasks, of course. The flow is:
- hosts: targets
roles:
- role-1
- role-2
pre_tasks:
- name: one
tasks:
- name: two
post_tasks:
- name: three
and evaluates as:
role-1:pre_tasks
role-2:pre_tasks
play:pre_tasks
role-1:tasks
role-2:tasks
play:tasks
role-1:post_tasks
role-2:post_tasks
play:post-tasks
I use it to have a role nginx-frontend, then then wants to know about
ofbiz-backend and php-backend, and other hosts that then have those
roles. I then have the backend role notify a handler, that then updates
/etc/hosts with the address found in $hostvars.
I'm wondering if this makes sense to anyone else, and if it would be
wanted? I haven't yet modified docsite, because I'm asking here first.
The following examples show a complex backend registration system; I hit
some snags with ordering, so I added the pre/post support for roles,
which should allow the main-line tasks to then query for the list of
backend mappings. I haven't yet modified my backend role(shown below)
with this new feature.
== examples:playbook.yml
- hosts: targets
accelerate: true
gather_facts: true
roles:
- etckeeper
- { role: nginx-frontend, when: "inventory_hostname in
(groups['frontend'] | default([]))" }
- { role: php-backend, when: "inventory_hostname in
(groups['php-backend'] | default([]))" }
- { role: mysql-backend, when: "inventory_hostname in
(groups['mysql-backend'] | default([]))" }
- { role: postgresql-backend, when: "inventory_hostname in
(groups['postgresql-backend'] | default([]))" }
- { role: ofbiz-backend, when: "inventory_hostname in
(groups['ofbiz-backend'] | default([]))" }
- { role: image-processor, when: "inventory_hostname in
(groups['image-processor'] | default([]))" }
== examples: nginx-frontend/meta.yml
dependencies:
- role: backend
tags: ['nginx']
args:
role: nginx-frontend
roles: ['ofbiz-backend', 'php-backend']
== examples: php-backend/meta.yml
dependencies:
- role: backend
tags: ['php']
args:
role: php-backend
roles: ['mysql-backend']
== examples: backend/tasks.yml
- set_fact:
host_roles: "{{host_roles is defined and
(host_roles.append(args.role) or host_roles) or [args.role]}}"
when: args.roles is defined
- set_fact:
wanted_roles: "{{wanted_roles is defined and
(wanted_roles.extend(args.roles) or wanted_roles) or args.roles}}"
notify:
- roles-scan {{ args.role }}
== examples: backend/handlers.yml
- name: roles-scan {{ args.role }}
when: item[1] in wanted_roles
lineinfile:
dest=/etc/hosts
regexp='^\S+\s+.*?{{item[1]}}.universe'
line='{{item[0].ansible_eth0.ipv4.address}} {{item[1]}}.universe'
notify:
- etckeeper commit
register: roles_scan_result
with_subelements:
- hostvars.values() | selectattr('host_roles', 'defined') | list
- 'host_roles'
==
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