I have 3 Nginx servers and each of them should handle about 2k users (concurrent connections). In front of them I have Nginx load balancer.
That's 4 Virtual machines, sharing same subnet and same physical machine. I would like to know, what VM specifications should I use for load balancer?
I have no experience with load balancing and have never done any tests, so I while I know what specs I need for my App Servers, I have no idea what should I use for nginx load balancer. Right now I'm thinking about 4 cores / 4GB RAM / 4GB HDD. What that be enough for load balancer?
Offtopic queston: Is it possible to configure mysql so that when one mysql DB is updated, so is another. Sort of like master/slave configuration or something like that?