to build k8s cluster on-perm after cloud based implementation of k8s service. On cloud they managed master nodes for you so you don’t need to worrie about HA of master components.
But on-perm they said that you need to have LB outside of cluster to manage HA of your API Server controls. Which is adding additional overhead in on-perm solution as you need to spin another VMs to handle this part.
Question is - is it in theory possible to use ingress to have cluster API management inside of cluster rather than outside LB?
I don't have the answer, but you can try to explore OKD, which is the upstream OpenShift. see how they implement or require the load balancer: https://www.okd.io/
example: https://docs.okd.io/latest/install_config/router/index.html
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