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71 lines
2.6 KiB
71 lines
2.6 KiB
# in Ansible 1.2 and later, roles allow easy best-practices organization of content
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# and maximize shareability of ansible building blocks.
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#
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# suppose a playbook applied to a group of hosts includes two roles, foo and bar.
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#
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# what do roles do in this case?
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#
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# listing the roles as foo and bar will auto include the following:
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#
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# tasks from ./roles/foo/tasks/main.yml, then ./roles/bar/tasks/main.yml
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# handlers from ./roles/foo/handlers/main.yml, then ./roles/bar/handlers/main.yml
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# vars from ./roles/foo/vars/main.yml, then ./roles/bar/vars/main.yml
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#
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# should any of these files not exist, that is ok, and they will simply not be loaded.
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#
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# should the task file in foo/tasks/main.yml want to include subtasks in other files, that
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# is also permitted.
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#
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# templates and copy operations also get smarter about where to look for content when using
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# roles.
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#
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# as an example, a task in foo/tasks/main.yml could copy or template a file by
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# referencing a "src=foo.j2" rather than having to explicitly path src=roles/foo/templates/foo.j2.
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---
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- hosts: all
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pre_tasks:
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# these tasks are executed prior to roles.
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# this might be a good time to signal an outage window or take a host out of a load balanced pool
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- local_action: shell echo "hi this is a pre_task step about {{ inventory_hostname }}"
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roles:
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# a role can be listed flat like this:
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#
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# - common
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# - webservers
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# but you can also pass variables to them, so they can be parameterized. You can call
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# a role more than once with different parameters too. It might look like the section
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# below. Note I can also declare tags at this time.
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- { role: foo, param1: 1000, param2: 2000, tags: [ 'foo', 'bar' ] }
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- { role: foo, param1: 8000, param2: 9000, tags: [ 'baz' ] }
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# add as many roles as you like, roles takes a list of roles names
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# these paths can be qualified, but if bare, it will look from them in
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# roles/{{rolename}} relative to the playbook
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# explicit tasks and handlers can be used, but are not required.
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# they will run after the roles if present.
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tasks:
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# you can still have loose tasks/handlers and they will execute after roles are applied
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- shell: echo 'this is a loose task'
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post_tasks:
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# just to provide a syntactic mirroring to 'pre_tasks', these run absolute last in the play.
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# this might be a good time to put a host back in a load balanced pool or end an outage window
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- local_action: shell echo 'this is a post_task about {{ inventory_hostname }}'
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