Does ansible-pull also provide the level of orchestration like the "ansible" push model?

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1

Hi,

I am wondering if “ansible-pull” also provides the orchestration like what ansible does in push model.
For example I have a site.yml that dictates all DB nodes have to be provisioned first, then web nodes can be provisioned. If I run ansible from the central machine, this order can be guaranteed.
But for ansible-pull, does such kind of mechanism exist?

Thanks,
Xicheng

2

you can setup your web playbooks to check if the db hosts have been
provisioned first and fail if they have not.

3

Thanks for the reply, I think that definitely works. But if I have to write the check-db-nodes code in web playbooks, I am not using the orchestration mechanism provided by ansible. This would probably make ansible no different from chef or puppet.

4

In pull mode, no, if you want something different you would need a
system that supports callback, like tower (http://ansible.com/tower).

5

Thanks Brian. Looks like push would be a better answer if orchestration is needed. I am trying to integrate ansible with cobbler without 2nd touch(trigger ansible-playbook on the central machine when os installation completes). I also would like to use the orchestration mechanism provided by ansible. What I have in mind right now is to write a playbook that holds ansible from running on host until its port 22 is up, which means cobbler has done its job on this particular host. if, in this case, a web host(from my original question) gets installed first and the port 22 is up, will ansible ignore it until all db hosts get installed?

6

There are several ways to do it, I think the easiest is to run a
playbook with at least 2 plays, the first against the db hosts, the
second against the web hosts, since the 2nd won't start until the
first one is done, you should have what you want.