I'm preparing to move to Amazon (via RightScale) from our existing infrastructure which in short is Plesk. I'm just starting to play around with the Zimbra Open Source installer and I've got a couple questions to start...

1. First, I've used wget to get started, just wondering if there's a YUM archive I could be using instead?
2. Since this is going to be a headless install, are there command line options available to "auto-accept" the license questions, and further (I'm stuck at this point due to an issue with our /etc/hosts) if there are further questions during installation, how can I provide input values to them?

Thanks to anyone that can lend a hand here.