Avoid running pre/post tasks without roles/tasks

[Hagai Kariti]

Hi all.

I have a master deployment playbook that more or less includes all of my servers, which I use with tags to deploy only the apps/configs I want at the time. Hosts are grouped into hostgroups by roles and each hostgroup has it's own pre/post tasks for handling load-balancers, etc. It looks something like this:

- hosts: tag_role_hostgroup1

  serial: 1

  pre_tasks:

    - name: Remove from lb

       ...

       tags: pre_tasks

  roles:

     - { role: app1, tags: app1 }

     - { role: app2, tags: app2 }

  post_tasks:

    - name: Register to lb

      ...

      tags: post_tasks

- hosts: tag_role_hostgroup2

  serial: 1

  pre_tasks:

    - name: Some preps

       ...

       tags: pre_tasks

  roles:

     - { role: app2, tags: app2 }

     - { role: app3, tags: app3 }

  post_tasks:

    - name: Cleanup

      ...

      tags: post_tasks

So far so good. It works pretty well as I can think about applications when deploying, and each hostgroup will take care of itself regarding load-balancers and all. Problem is when deploying for example app1 or app3. In this case one play will have no roles selected, but since I'm including "pre_tasks,post_tasks" as tags its pre/post tasks will still run, bringing machines down and up again with no work done.

Do you have an idea of how to tackle this? I prefer to not create a playbook per app as it's a lot less powerful and flexible. I was thinking of making ansible run pre/post tasks only if some task in roles/tasks is going to run, but that's kind of a last resort.

Thanks for Ansible, btw!

[Michael DeHaan]

You could possibly consider passing ansible-playbook a --limit to only run on the servers you want to run on.

Others may have better suggestions.

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