where does kubernetes from docker on mac store state

When it comes to managing Docker containers on a Mac using Kubernetes, understanding how networking works is crucial. One of the fundamental questions many users ask is where Kubernetes stores its state information. In this article, we will explore the inner workings of Kubernetes networking and provide answers to this question.

Before diving into the details, let's clarify what Kubernetes requires from its network architecture. Unlike Docker, which provides a single solution for container networking, Kubernetes describes the properties of its cluster network in general terms. This means that there is no restriction on how Kubernetes implements its networking requirements.

One of the key features of Kubernetes networking is the ability to assign each pod a unique IP address (IP-per-Pod). This allows every other pod in the cluster to reach it at that same address. Additionally, any program running on a cluster node should be able to communicate with any pod on the same node without using Network Address Translation (NAT).

The Kubernetes networking model defines a set of fundamental rules that govern how packets flow inside and outside the cluster. These rules include intercepting and rewriting traffic using Netfilter and Iptables, tracing pod-to-pod communication on different nodes, tracing pod-to-pod traffic on the same node, and inspecting pod-to-pod traffic in the cluster.

But where does Kubernetes store its state information? The answer lies in the way that pods are networked together. Each pod has its own network namespace, which is connected to an Ethernet bridge. This allows pods to communicate with each other directly without the need for NAT.

When a pod is created, it is assigned a single IP address and a network namespace is created. Inside this namespace, a pause container creates a new network namespace for the pod. This process is managed by Linux network namespaces, which provide isolation between different networking environments.

In summary, Kubernetes stores its state information in the network namespaces of each pod. By assigning unique IP addresses to each pod and connecting them together using Ethernet bridges, Kubernetes provides a robust and scalable networking architecture for managing Docker containers on a Mac.

Where does kubernetes from docker on mac store state