I have a cluster in AWS which is set up as Topology=Private and has an Internal Loadbalancer. Now I'm trying to deploy an Nginx Ingress Loadbalancer for it to expose the application pods to the internet.
I am trying to understand that in such a setting what will be the role of my internal loadbalancer (which I believe is a Elastic Loadbalancer). And could I have this setup even without the internal loadbalancer? In fact, what functionality would the cluster lose without the internal loadbalancer?
It is good to have the load balancer (ELB) for HA purpose, But place public facing ELB before the nginx controller instead of behind it. You can also do custom path routing in ALB (Layer7). Ideal setup would be
ELB(Public with SSL termination) --> 2 Nginx Ingress Loadbalancer(for HA have 2 instances in diff subnet) --> Application Pods.
Apart from ELB, remaining can be placed in private subnets.