Each room (a Pod) in this hotel is equipped with a guest room phone (a network interface). Your company is sponsoring your participation in this conference, so you’ll all stay in the same hotel (a Kubernetes node). To illustrate this, imagine you go to a conference in Vegas with your coworkers. This also means each Pod has its own netns and thus we have a Network Namespace segregated by network interfaces. Looking closely, we can see that each Pod also has its own eth interface, meaning each Pod has its own network configuration (IP, Route, etc). This is illustrated as eth0 in the image above. These can be either virtual or physical machines, or indeed anything else that is able to run Kubernetes - are also able to communicate with all the Pods, without the need for NAT.Įach Pod will see itself with the same IP that other Pods see it as having.Įvery Kubernetes node (a Master or Worker) is a Linux machine (VM or Bare Metal) that has a Network Namespace - netns - having a network interface as its main interface. Nodes - the machines that run the Kubernetes cluster.
Pods are all able to communicate with one another without the need to make use of Network Address Translation (NAT). The official documentation says the Kubernetes Network Model requires that: There are a few basic assumptions that the Kubernetes Network Model follows.
In this section, we will focus primarily on understanding how Pod-to-Pod communication works. “Networking is a central part of Kubernetes, but it can be challenging to understand exactly how it is expected to work.”īefore we talk about flannel and how it fits here it is important to understand the network characteristics of a cluster.
View on GitHub Flannel Cluster Networking
#WHAT IS KUBERNETES FLANNEL INSTALL#
Flannel This tutorial is someone planning to install a Kubernetes cluster and wants to understand how everything fits together. Flannel | kubernetes-under-the-hood Skip to the content.
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