I am looking at a lot of docs and tutorials, but I am not sure yet how this exactly works. Lets say I do want to setup a:
Where Wordpress1 is a server with like 15 Wordpress websites on it.
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Would you mind giving a little bit more information on why you need a load balancer with this setup? I believe that with the setup that you’ve described, there is not really a need for a layer 4 load balancer.
You would add a load balancer to a setup where server 1 and server 2 are copies of each other so that the layer 4 load balancer would distribute the traffic between the two servers, eg:
That way, if web server 1 goes down, the load balancer would distribute the traffic to the healthy web server.
However in your case if you only have some sites on server 1 and some sites on server 2, this would still be a single point of failure.
For a quick introduction on what the benefits of a load balancer are, I could suggest the following tutorial:
Hope that this helps and let me know if you have any questions!