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If your “host servers” are known (say 4 backends) you set up the balancer and point it to the 4 host IPs.

If you are dynamically allocating host servers and needing to register them with the LB you should probably consider K8s?

This is designed for a “more stable” world:

Have some hosts. Have an LB. Deploy containers to those hosts. Avoid superfluous k8s complexity that you don’t need.

I don't think you need K8S for that. Any decent load balancer (LB) is going to have some concept of origin configuration that weights routing with various algorithms and health checks. You would just update the config in the LB when you bring a new origin online.

Load balancing isn't part of MRSK - all public clouds offer them, Digitalocean does as well. Or DIY with Haproxy, Nginx, Traefik, etc.

I’m also interested in this setup and have so far only had experience using HAProxy. Any alternatives HN can recommend? (software)

Sorry one of the key part of deploying web applications is not part of the offering.

He sets up a load balancer in his demo video? Did you watch it?