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Getting Started with Kubernetes, Second Edition
Getting Started with Kubernetes, Second Edition

Getting Started with Kubernetes, Second Edition: Orchestrate and manage large-scale Docker deployments , Second Edition

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Getting Started with Kubernetes, Second Edition

Introduction to Kubernetes

In this book, we will help you learn to build and manage Kubernetes clusters. You will be given some of the basic container concepts and the operational context, wherever possible. Throughout the book, you'll be given examples that you can apply as you progress through the book. By the end of the book, you should have a solid foundation and even dabble in some of the more advance topics such as federation and security. 

This chapter will give a brief overview of containers and how they work as well as why management and orchestration is important to your business and/or project team. The chapter will also give a brief overview of how Kubernetes orchestration can enhance our container management strategy and how we can get a basic Kubernetes cluster up, running, and ready for container deployments.

This chapter will include the following topics:

  • Introducing container operations and management
  • Why container management is important?
  • The advantages of Kubernetes
  • Downloading the latest Kubernetes
  • Installing and starting up a new Kubernetes cluster
  • The components of a Kubernetes cluster

A brief overview of containers

Over the past three years, containers have grown in popularity like wildfire. You would be hard-pressed to attend an IT conference without finding popular sessions on Docker or containers in general.

Docker lies at the heart of the mass adoption and the excitement in the container space. As Malcom McLean revolutionized the physical shipping world in the 1950s by creating a standardized shipping container, which is used today for everything from ice cube trays to automobiles (you can refer to more details about this in point 1 in the References section at the end of the chapter), Linux containers are revolutionizing the software development world by making application environments portable and consistent across the infrastructure landscape. As an organization, Docker has taken the existing container technology to a new level by making it easy to implement and replicate across environments and providers.

What is a container?

At the core of container technology are control groups (cgroups) and namespaces. Additionally, Docker uses union filesystems for added benefits to the container development process.

Cgroups work by allowing the host to share and also limit the resources each process or container can consume. This is important for both, resource utilization and security, as it prevents denial-of-service attacks on the host's hardware resources. Several containers can share CPU and memory while staying within the predefined constraints.

Namespaces offer another form of isolation for process interaction within operating systems. Namespaces limit the visibility a process has on other processes, networking, filesystems, and user ID components. Container processes are limited to see only what is in the same namespace. Processes from containers or the host processes are not directly accessible from within this container process. Additionally, Docker gives each container its own networking stack that protects the sockets and interfaces in a similar fashion.

Composition of a container

Union filesystems are also a key advantage of using Docker containers. Containers run from an image. Much like an image in the VM or Cloud world, it represents state at a particular point in time. Container images snapshot the filesystem, but tend to be much smaller than a VM. The container shares the host kernel and generally runs a much smaller set of processes, so the filesystem and boot strap period tend to be much smaller. Though those constraints are not strictly enforced. Second, the union filesystem allows for efficient storage, download, and execution of these images.

The easiest way to understand union filesystems is to think of them like a layer cake with each layer baked independently. The Linux kernel is our base layer; then, we might add an OS such as Red Hat Linux or Ubuntu. Next, we might add an application such as Nginx or Apache. Every change creates a new layer. Finally, as you make changes and new layers are added, you'll always have a top layer (think frosting) that is a writable layer.

Layered filesystem

What makes this truly efficient is that Docker caches the layers the first time we build them. So, let's say that we have an image with Ubuntu and then add Apache and build the image. Next, we build MySQL with Ubuntu as the base. The second build will be much faster because the Ubuntu layer is already cached. Essentially, our chocolate and vanilla layers, from the preceding Layered filesystem figure, are already baked. We simply need to bake the pistachio (MySQL) layer, assemble, and add the icing (the writable layer).

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Key benefits

  • Get well-versed with the fundamentals of Kubernetes and get it production-ready for deployments
  • Confidently manage your container clusters and networks using Kubernetes
  • This practical guide will show you container application examples throughout to illustrate the concepts and features of Kubernetes

Description

Kubernetes has continued to grow and achieve broad adoption across various industries, helping you to orchestrate and automate container deployments on a massive scale. This book will give you a complete understanding of Kubernetes and how to get a cluster up and running. You will develop an understanding of the installation and configuration process. The book will then focus on the core Kubernetes constructs such as pods, services, replica sets, replication controllers, and labels. You will also understand how cluster level networking is done in Kubernetes. The book will also show you how to manage deployments and perform updates with minimal downtime. Additionally, you will learn about operational aspects of Kubernetes such as monitoring and logging. Advanced concepts such as container security and cluster federation will also be covered. Finally, you will learn about the wider Kubernetes ecosystem with OCP, CoreOS, and Tectonic and explore the third-party extensions and tools that can be used with Kubernetes. By the end of the book, you will have a complete understanding of the Kubernetes platform and will start deploying applications on it.

Who is this book for?

This book is for developers, sys admins, and DevOps engineers who want to automate the deployment process and scale their applications. You do not need any knowledge about Kubernetes.

What you will learn

  • Download, install, and configure the Kubernetes codebase
  • Understand the core concepts of a Kubernetes cluster
  • Be able to set up and access monitoring and logging for Kubernetes clusters
  • Set up external access to applications running in the cluster
  • Understand how CoreOS and Kubernetes can help you achieve greater performance and container implementation agility
  • Run multiple clusters and manage from a single control plane
  • Explore container security as well as securing Kubernetes clusters
  • Work with third-party extensions and tools

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : May 31, 2017
Length: 286 pages
Edition : 2nd
Language : English
ISBN-13 : 9781787284135
Vendor :
Google
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Product Details

Publication date : May 31, 2017
Length: 286 pages
Edition : 2nd
Language : English
ISBN-13 : 9781787284135
Vendor :
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Table of Contents

12 Chapters
Introduction to Kubernetes Chevron down icon Chevron up icon
Pods, Services, Replication Controllers, and Labels Chevron down icon Chevron up icon
Networking, Load Balancers, and Ingress Chevron down icon Chevron up icon
Updates, Gradual Rollouts, and Autoscaling Chevron down icon Chevron up icon
Deployments, Jobs, and DaemonSets Chevron down icon Chevron up icon
Storage and Running Stateful Applications Chevron down icon Chevron up icon
Continuous Delivery Chevron down icon Chevron up icon
Monitoring and Logging Chevron down icon Chevron up icon
Cluster Federation Chevron down icon Chevron up icon
Container Security Chevron down icon Chevron up icon
Extending Kubernetes with OCP, CoreOS, and Tectonic Chevron down icon Chevron up icon
Towards Production Ready Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.7
(3 Ratings)
5 star 66.7%
4 star 33.3%
3 star 0%
2 star 0%
1 star 0%
KPaddy Aug 30, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
First things first, do not expect to use this book for installation and maintenance of a K8s cluster or from IT perspective. That affair changes too fast to be addressed in a book. Unfortunately the first chapter gives a hint of that and that is where I kept down the book once. And then it took me another week to give it another go.This book is more for all the post-installation tasks including cluster configuration, understanding the netwrking, service-discovery, storage configuration, application deployment etc. And the book does a good job of that.Relating K8s to DevOps is something I had hard time doing, looking at the documentation and online blogs. Networking documentation online are either too abstract or too detailed. Both these concerns are addressed adequately in the book.Overall a good read for devops and developers. Especially with the lack of another good and "current" book.As for installations of the cluster, if you are new to K8s, try a installation template from a cloud platform, based on their "current" documentation. Azure, GCP, Bluemix all provide cluster service natively, though Bluemix trial cluster has limitations on storage and networking. And it is not hard to get started on AWS. This book will help you while creating a cluster on premise, but again, you are better off following the documentation.
Amazon Verified review Amazon
f. e. nar Feb 06, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
It is a good starter book for Kubernetes but do not expect more than "Start" for details.
Amazon Verified review Amazon
Makros Sep 29, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
This particular book emphasizes using Kubernetes with Google's cloud service, with fewer references to AWS. Actually unsurprising, given that Kubernetes was invented by Google, but something you should know.
Amazon Verified review Amazon
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