Throughout the book, we use at least three servers with a Linux-based OS to build all of the components in Kubernetes. At the beginning of the book, you could use one machine, whether it is Linux or Windows, to learn about the concepts and basic deployment. From a scalability point of view, we recommend you start with three servers in order to scale out the components independently and push your cluster to the production level.

You can download the example code files for this book from your account at www.packtpub.com. If you purchased this book elsewhere, you can visit www.packtpub.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packtpub.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Kubernetes-Cookbook-Second-Edition. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://www.packtpub.com/sites/default/files/downloads/KubernetesCookbookSecondEdition_ColorImages.pdf.

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "Prepare the following YAML file, which is a simple Deployment that launches two nginx containers."

A block of code is set as follows:

# cat 3-1-1_deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

Annotations:            deployment.kubernetes.io/revision=1
Selector:               env=test,project=My-Happy-Web,role=frontend
Replicas:               5 desired | 5 updated | 5 total | 5 available | 0 unavailable
StrategyType:           RollingUpdate

Any command-line input or output is written as follows:

//install kubectl command by "kubernetes-cli" package
$ brew install kubernetes-cli

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Installation is straightforward, so we can just choose the default options and click Next."