Hello,
the problem was not DNS related, it was the hostname of my machines that 
were too long.
He did solve the problem by adding this to my ansible.cfg:

control_path = %(directory)s/%%h-%%r
#control_path = %(directory)s/ansible-ssh-%%h-%%p-%%r


Hope this will help!


Le vendredi 17 juin 2016 16:58:50 UTC+2, J Hawkesworth a écrit :
>
> I doubt ansible has its own dns cache.  
> I forget which distro it was now but a while back i used to have to 
> occasionally restart nscd service when I had dns problems like this.
>
> Hope this helps,
>
> Jon
>
> On Friday, June 17, 2016 at 2:20:55 PM UTC+1, Julien Deloubes wrote:
>>
>> Problem disappeared but finally reappeared after a few successful runs!
>> I can always ssh on the impacted hosts.
>> Don't know where to search? Is Ansible has some sort of dns cache or 
>> something?
>>
>> Le dimanche 12 juin 2016 16:57:59 UTC+2, Julien Deloubes a écrit :
>>>
>>> Hello,
>>> i have a strange problem on Ansible 2.0, my playbook couldn't resolve 
>>> anymore the fqdn of my inventory.
>>> I can ssh to the machines in my inventory.
>>> I tried using an inventory file or specify the hosts with the -i option.
>>> I can run the playbook using the ip @.
>>> I'm scratching my head about what is happening, do you have any clues?
>>>
>>

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