Ansible: deploy on multiple hosts in the same time

Question

Is it possible to run ansible playbook, which looks like this (it is an example from this site: http://docs.ansible.com/playbooks_roles.html):

- name: this is a play at the top level of a file   hosts: all   remote_user: root   tasks:   - name: say hi     tags: foo     shell: echo "hi..."  - include: load_balancers.yml - include: webservers.yml - include: dbservers.yml 

in multithread mode?

I want to run three "includes" in the same time (it is deploying to different hosts anyway), like in this diagram:

http://www.gliffy.com/go/publish/5267618

Is it possible?

Answer 1

As of Ansible 2.0 there seems to be an option called strategy on a playbook. When setting the strategy to free, the playbook plays tasks on each host without waiting to the others. See http://docs.ansible.com/ansible/playbooks_strategies.html.

It looks something like this (taken from the above link):

- hosts: all   strategy: free   tasks:   ... 

Please note that I didn't check this and I'm very new to Ansible. I was just curious about doing what you described and happened to come acroess this strategy thing.

EDIT:

It seems like this is not exactly what you're trying to do. Maybe "async tasks" is more appropriate as described here: http://docs.ansible.com/ansible/playbooks_async.html.

This includes specifying async and poll on a task. The following is taken from the 2nd link I mentioned:

- name: simulate long running op, allow to run for 45 sec, fire and forget   command: /bin/sleep 15   async: 45   poll: 0 

I guess you can specify longer async times if your task is lengthy. You can probably define your three concurrent task this way.