Thanks JYL. Looks promising. Will have a closer look.

On Thursday, June 9, 2016 at 12:55:07 AM UTC+10, Jean-Yves LENHOF wrote:
>
> Le 2016-06-08 16:27, [email protected] <javascript:> a écrit : 
> > New to Ansible. Looking for help with orchestrating actions which 
> > depend on the state of applications on other servers. Can this be done 
> > in Ansible? 
> > 
> > Scenario: 
> > 
> > server 1 running app 1 
> > server 2 running app 2 
> > server 3 running app 3 
> > 
> > Need to stop app2 on server 2 but app 2 must not be stopped if either 
> > app 1 or app 3 is up - app1 and app 3 are client apps which would 
> > crash if app2 was brought down 
> > i.e. need to know the state of app 1 and app 3 at the time a stop of 
> > app 2 is attempted to make a decision whether to proceed or not 
> > 
> > In other words can the state of multiple components on various servers 
> > be maintained and tested before an action is performed. Essentialy a 
> > state machine paradigm. 
> > 
> > Any help appreciated. 
>
> Hi, 
>
> Perhaps you should have a look at this page : 
>
> http://docs.ansible.com/ansible/playbooks_delegation.html 
>
> I think you should use serial & max_fail_percentage... 
>
> But that does'nt change your organisation : you should test all changes 
> on qualification servers before production ones... 
>
> Regards, 
>
> JYL 
>

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