HA infrastructure

I would like to create VPS infrastructure like some from these variants Cloud Computing System Architecture Diagrams
I have some questions?

  1. Which variant you using?
  2. What about when IW master cluster node will shut down?
  3. Do you recommend another VPS infrastructure?

Hello

Our clustering solution is not HA. The cluster manager is always a single point of failure–if it goes down, everything will.

Thanks,
-Jenna