January 2019
Intermediate to advanced
170 pages
3h 23m
English
Content preview from Kubernetes in the Enterprise
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Chapter 2. Fundamental Kubernetes Topics
In this chapter, we provide an introduction to the basic foundations of Kubernetes. We begin with an overview of the Kubernetes architecture and its deployment models. Next, we describe a few options for running Kubernetes and describe a variety of deployment environments. We then describe and provide examples of several fundamental Kubernetes concepts including Pods, labels, annotations, ReplicaSets, and Deployments.
Kubernetes Architecture
Kubernetes architecture at a high level is relatively straightforward. It is composed of a master node and a set of worker nodes. The nodes can be either physical servers or virtual machines (VMs). Users of the Kubernetes environment interact with the master node using either a command-line interface (kubectl), an application programming interface (API), or a graphical user interface (GUI). The master node is responsible for scheduling work across the worker nodes. In Kubernetes, the unit of work that is scheduled is called a Pod, and a Pod can hold one or more container. The primary components that exist on the master node are the kube-apiserver, kube-scheduler, etcd, and the kube-controller-manager:
- kube-apiserver
The kube-apiserver makes available the Kubernetes API that is used to operate the Kubernetes environment.
- kube-scheduler
The kube-scheduler component is responsible for selecting the nodes on which Pods should be created.
- kube-controller-manager
Kubernetes provides several high-level abstractions ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.