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Mastering Kubernetes
Mastering Kubernetes

Mastering Kubernetes: Master the art of container management by using the power of Kubernetes , Second Edition

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Mastering Kubernetes

Creating Kubernetes Clusters

In the previous chapter, we learned what Kubernetes is all about, how it is designed, what concepts it supports, how to use its runtime engines, and how it fits within the CI/CD pipeline.

Creating a Kubernetes cluster is a non-trivial task. There are many options and tools to select from, and there are many factors to consider. In this chapter, we'll roll up our sleeves and build some Kubernetes clusters. We will also discuss and evaluate tools such as Minikube, kubeadm, kube-spray, bootkube, and stackube. We will also look into deployment environments, such as local, cloud, and bare metal. The topics we will cover are as follows:

  • Creating a single-node cluster with Minikube
  • Creating a multi-node cluster using kubeadm
  • Creating clusters in the cloud
  • Creating bare-metal clusters from scratch
  • Reviewing other options for creating Kubernetes clusters...

A quick single-node cluster with Minikube

In this section, we will create a single-node cluster on Windows. The reason we will use Windows is that Minikube and single-node clusters are most useful for local developer machines. While Kubernetes is typically deployed on Linux in production, many developers work on Windows PCs or Macs. That said, there aren't too many differences if you do want to install Minikube on Linux:

Getting ready

There are some prerequisites to install before you can create the cluster itself. These include VirtualBox, the kubectl command-line interface for Kubernetes, and, of course, Minikube itself. Here is a list of the latest versions at the time of writing:

Creating a multinode cluster using kubeadm

In this section, I'll introduce you to kubeadm, the recommended tool for creating Kubernetes clusters on all environments. It is still under active development, but it is the way to go because it is part of Kubernetes, and will always embody best practices. To make it accessible for the entire cluster, we will base it on VMs. This section is for readers who want a hands-on experience of deploying a multi-node cluster.

Setting expectations

Before embarking on this journey, I want to make it clear that it might not be a smooth ride. kubeadm has a difficult task: It has to follow the evolution of Kubernetes itself, which is a moving target. As a result, it is not always stable...

Creating clusters in the cloud (GCP, AWS, and Azure)

Creating clusters locally is fun, and important during development and when trying to troubleshoot problems locally. But in the end, Kubernetes is designed for cloud-native applications (applications that run in the cloud). Kubernetes doesn't want to be aware of individual cloud environments because that doesn't scale. Instead, Kubernetes has the concept of a cloud-provider interface. Every cloud provider can implement this interface and then host Kubernetes. Note that, as of version 1.5, Kubernetes still maintains implementations for many cloud providers in its tree, but in the future, they will be refactored out.

The cloud-provider interface

The cloud-provider...

Creating a bare-metal cluster from scratch

In the previous section, we looked at running Kubernetes on cloud providers. This is the dominant deployment story for Kubernetes, but there are strong use cases for running Kubernetes on bare metal. I don't focus here on hosted versus on-premises; this is yet another dimension. If you already manage a lot of servers on-premises, you are in the best position to decide.

Use cases for bare metal

Bare-metal clusters are a beast especially if you manage them yourself. There are companies that provide commercial support for bare-metal Kubernetes clusters, such as Platform 9, but the offerings are not mature yet. A solid open-source option is Kubespray, which can deploy industrial...

The process

There is a lot to do. Here is a list of some of the concerns you'll have to address:

  • Implementing your own cloud provider's interface or sidestepping it
  • Choosing a networking model and how to implement it (using a CNI plugin or directly compiling)
  • Whether or not to use a network policy
  • Select images for system components
  • Security models and SSL certificates
  • Admin credentials
  • Templates for components such as an API server, replication controller, and scheduler
  • Cluster services such as DNS, logging, monitoring, and GUI

I recommend reading the guide at the Kubernetes site (http://bit.ly/1ToR9EC) to get a deeper understanding of what it takes to create a cluster from scratch.

Using virtual private cloud infrastructure

If your use case falls under the bare-metal use cases, but you don't have the necessary skilled manpower or the inclination to deal with the infrastructure challenges of bare metal, you have the option of using a private cloud such as OpenStack (for example, with stackube). If you want to aim a little higher in the abstraction ladder, then Mirantis offers a cloud platform built on top of OpenStack and Kubernetes.

In this section, we considered the option of building a bare-metal cluster Kubernetes cluster. We looked into the use cases that require it and highlighted the challenges and difficulties.

Bootkube

Bootkube is very interesting too. It can launch self-hosted Kubernetes...

Summary

In this chapter, we got into some hands-on cluster creation. We created a single-node cluster using Minikube and a multi-node cluster using kubeadm. Then we looked at the many options to create Kubernetes clusters using cloud providers. Finally, we touched on the complexities of creating Kubernetes clusters on bare metal. The current state of affairs is very dynamic. The basic components are changing rapidly, the tooling is still young, and there are different options for each environment. It's not completely trivial to set up a Kubernetes cluster, but with some effort and attention to detail, you can get it done quickly.

In the next chapter, we will explore the important topics of monitoring, logging, and troubleshooting. Once your cluster is up and running and you start deploying workloads, you need to make sure that it runs properly and satisfies requirements....

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Key benefits

  • •Explore the latest features available in Kubernetes 1.10
  • •Ensure that your clusters are always available, scalable, and up to date
  • •Master the skills of designing and deploying large clusters on various cloud platforms

Description

Kubernetes is an open source system that is used to automate the deployment, scaling, and management of containerized applications. If you are running more containers or want automated management of your containers, you need Kubernetes at your disposal. To put things into perspective, Mastering Kubernetes walks you through the advanced management of Kubernetes clusters. To start with, you will learn the fundamentals of both Kubernetes architecture and Kubernetes design in detail. You will discover how to run complex stateful microservices on Kubernetes including advanced features such as horizontal pod autoscaling, rolling updates, resource quotas, and persistent storage backend. Using real-world use cases, you will explore the options for network configuration, and understand how to set up, operate, and troubleshoot various Kubernetes networking plugins. In addition to this, you will get to grips with custom resource development and utilization in automation and maintenance workflows. To scale up your knowledge of Kubernetes, you will encounter some additional concepts based on the Kubernetes 1.10 release, such as Promethus, Role-based access control, API aggregation, and more. By the end of this book, you’ll know everything you need to graduate from intermediate to advanced level of understanding Kubernetes.

Who is this book for?

Mastering Kubernetes is for you if you are a system administrator or a developer who has an intermediate understanding of Kubernetes and wish to master its advanced features. Basic knowledge of networking would also be helpful. In all, this advanced-level book provides a smooth pathway to mastering Kubernetes.

What you will learn

  • •Architect a robust Kubernetes cluster for long-time operation
  • •Discover the advantages of running Kubernetes on GCE, AWS, Azure, and bare metal
  • •Understand the identity model of Kubernetes, along with the options for cluster federation
  • •Monitor and troubleshoot Kubernetes clusters and run a highly available Kubernetes
  • •Create and configure custom Kubernetes resources and use third-party resources in your automation workflows
  • •Enjoy the art of running complex stateful applications in your container environment
  • •Deliver applications as standard packages
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Apr 27, 2018
Length: 468 pages
Edition : 2nd
Language : English
ISBN-13 : 9781788999786
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Google
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Publication date : Apr 27, 2018
Length: 468 pages
Edition : 2nd
Language : English
ISBN-13 : 9781788999786
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Table of Contents

15 Chapters
Understanding Kubernetes Architecture Chevron down icon Chevron up icon
Creating Kubernetes Clusters Chevron down icon Chevron up icon
Monitoring, Logging, and Troubleshooting Chevron down icon Chevron up icon
High Availability and Reliability Chevron down icon Chevron up icon
Configuring Kubernetes Security, Limits, and Accounts Chevron down icon Chevron up icon
Using Critical Kubernetes Resources Chevron down icon Chevron up icon
Handling Kubernetes Storage Chevron down icon Chevron up icon
Running Stateful Applications with Kubernetes Chevron down icon Chevron up icon
Rolling Updates, Scalability, and Quotas Chevron down icon Chevron up icon
Advanced Kubernetes Networking Chevron down icon Chevron up icon
Running Kubernetes on Multiple Clouds and Cluster Federation Chevron down icon Chevron up icon
Customizing Kubernetes – API and Plugins Chevron down icon Chevron up icon
Handling the Kubernetes Package Manager Chevron down icon Chevron up icon
The Future of Kubernetes Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.6
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5 star 60%
4 star 0%
3 star 10%
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1 star 30%
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Nicholas Aug 13, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Gigi makes it easy to understand the concepts behind containerization and how Kubernetes fits into that picture. I struggled previously with understanding all the new terminology and how all the pieces fit together in container orchestration. There's a lot of new terms and new concepts, but this book gave me a strong foundation. I recommend this book to complete newcomers to containerization as well as those with some knowledge, but no practical usage.
Amazon Verified review Amazon
Hetz Ben Hamo May 30, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I liked the first edition of this book, which covered a lot of the Kubernetes features.This 2nd edition covers much more, it's up to date and still it's a really great book for people who just start with Kubernetes or those who have some experience and would like to update to the latest and greatest.5 stars, highly recommended!
Amazon Verified review Amazon
Ali Marshal May 16, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The second edition of Mastering Kubernetes is a great book. It covers a large platform like Kubernetes in great detail and clarity and is up to date to the latest release (1.10). It introduces the design principles as well as deep dives into the most advanced topics like the CRI, CSI and extensibility.The organization of the material and the many code snippets make it easy to understand the current status of different capabilities and when it is appropriate to use them. I highly recommend it.
Amazon Verified review Amazon
RR Aug 31, 2019
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This book helped me cofound my own startup. An inspirational read by an inspirational author.
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Moosa Choudhry Jun 01, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Well-written, accurate, up-to-date.
Amazon Verified review Amazon
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