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While kube-proxy is a tool to generate the IP tables magic which let you connect to any of the pod(using servics) in kubernetes no matter on which node that pod exist. In short, overlay networks define the underlying network which can be used for communicating the various component of kubernetes. So when you make a request to .local, it resolves to 10.23.1.2, and then iptables rules on your local host (generated by kube-proxy) redirect it to one of 10.1.0.3 or 10.2.3.5 or 10.3.5.6 at random. kube-proxy sets up iptables rules in order to do random load balancing between them.kube-dns resolves Kubernetes service DNS names to IP addresses (so .local might map to 10.23.1.2).Every Kubernetes service gets an IP address (like 10.23.1.2).Just to understand kube-proxy, Here’s how Kubernetes services work! A service is a collection of pods, which each have their own IP address (like 10.1.0.3, 10.2.3.5, 10.3.5.6) Do the right thing when nodes are added & removed. Keep a stable mapping of nodes to subnets and keep every node in your cluster updated with that mapping.Make sure your pods can send network requests outside your cluster.But as far as I’m concerned an overlay network has 2 responsibilities: There are a lot of overlay network backends (calico, flannel, weave) and the landscape is pretty confusing. When I say “overlay network” this is what I mean (“the system that lets you refer to a pod by its IP address”).Īll other Kubernetes networking stuff relies on the overlay networking working correctly. Kubernetes assumes that every pod has an IP address and that you can communicate with services inside that pod by using that IP address.
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