Thanks for the reply. I can see varnish was there already.
I want WordPress easily imstallable with redis enabled or with cache plugins configured. VPSSIM is a tool which does that. I have the conf files which do the setup. I can share it you if you want. It's important for proper caching in pure nginx server for WordPress because without that, it's not under control. I will be using Webuzo if it solves this issue ASAP. I'm ready to provide full help from my side provided the feature is implemented. Let me know how can I help.