Session affinity for the Controller service

[adrianmo]

By default, Kubernetes services load balance incoming requests to all backend pods in a round robin fashion. However, there's an option to enable session affinity to services to forward traffic from a particular source IP to the same backend pod. This option is ideal to achieve better performance in the client-controller communication, where a particular client would always contact to the same controller instance and avoid extra communication between controller instances.

[adrianmo]

Related blog post: https://medium.com/@diegomrtnzg/redirect-your-users-to-the-same-pod-by-using-session-affinity-on-kubernetes-baebf6a1733b

[adrianmo]

Let's be careful about source IP affinity because external clients might get their original IP translated and that might invalidate this approach. Need to explore the application-level cookie affinity approach.