Can I specify regions with Ansible "serial" param?

Question

I am running a server deployment in ec2 through Ansible. I start deployment on several servers at a time using a parameter serial, for example:

- name: run update
  hosts: tag_app_servers:&tag_active_servers
  serial: 7
  sudo: True
  pre_tasks:
  - name: Gathering ec2 facts
    action: ec2_facts
  # do the deregistration here
  roles:
  - some_role
  - some_other_role
  post_tasks:
  # re-register boxes here.

Thing is, Ansible believes that all my servers are the same (as it should be) and do not distinguish between servers in different regions. Therefore, although I would like it to take one server from each of the 7 regions I was in and run updates on parallel servers, Ansible can instead take 7 servers from only one region and completely cripple it. This is not a huge problem, because traffic is simply redirected to other regions, but it is far from ideal. What would be a good way to get it to capture servers from different regions when running multiple server updates in parallel?

Answer 1

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