Dear yeayu,
Perfect! You are right...
I waste my time to read many documentation over internet.
But, I think that I found the right interlocutors now.
Our infrastructure is based on virtualisation.
We have 85% Linux VMs and 15% Windows.
We already use an automation tool which is Bladelogic.
I have earlier done some comparison between Puppet and Bladelogic and found that the last one is powerful than Puppet.
But we are oblige to change bladelogic for Group security raison.
They proposed us 3 software (Chef, spacewalk and Puppet) .
We have two distant Datacenter.
We want to continue our Deployment, automatic OS installation, dashboard, Group VM creation and so one...
We have to take ownership on this automation tool and give limited right to our partner.
Best Regards !