How the Aggregated Apiserver Works

Overview

Before diving into the implementation of the aggregated apiserver, let’s take a tour of how the aggregated apiserver works in a Kubernetes cluster.

We’ll start with a high-level view on the aggregated apiserver. What is it made of?

A high-level view

An aggregated apiserver works in a similar way to the kube-apiserver. It resembles most parts of the kube-apiserver. This leads to nearly the same architecture (as shown below). However, the aggregated apiserver does not have an embedded kube-aggregator and an embedded apiextension-apiserver (which serves CRDs).