Creating an overlay network

Kubernetes abstracts the networking to enable communication between containers across nodes. The basic unit to make it possible is named pod, which is the smallest deployment unit in Kubernetes with a shared context in a containerized environment. Containers within a pod can communicate with others by port with the localhost. Kubernetes will deploy the pods across the nodes.

Then, how do pods talk to each other?

Kubernetes allocates each pod an IP address in a shared networking namespace so that pods can communicate with other pods across the network. There are a couple of ways to achieve the implementation. The easiest and across the platform way will be using flannel.

Flannel gives each host an IP subnet, which can be ...

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