Sync gateway install

Hi, I have a requirement to setup sync gateway.

  1. How many nodes I should setup and is there any HA required?
    I have a 7 node CB database server (3 Data, 2 Index and 2 Rest)

  2. How can I get setup files> What I have is rpm but I want to setup different user and automate the install with that user only.

  3. I need to know about kernel parameters and RPMs I should have for this.

  4. How the staging bucket get synched with data bucket? I see your documentation that sync gateway connects to staging bucket.