Some basic Linux knowledge is needed, as this book does not explain the basics of Linux management.

The examples given in this book can be implemented either in the cloud or on-premises. Some of the setups were deployed on Microsoft's cloud platform, Azure, so having an account with Azure to follow the examples is recommended. Azure does offer a free trial to evaluate and test deployments before committing—more information can be found at https://azure.microsoft.com/free/.
Additionally, more information on Azure's offerings can be found at: https://azure.microsoft.com.

Since the book entirely revolves around Linux, having a way to connect to the internet is a requirement. This can be done from a Linux desktop (or laptop), a macOS Terminal, or Windows Subsystem for Linux (WSL).

All of the examples illustrated in this book make use of open source software that can be easily obtained from either the available repositories or from their respective sources, without the need of a paying license.

Be sure to drop by the projects pages to show some love—a lot of effort goes into developing them:

• https://github.com/gluster/glusterfs
• https://github.com/zfsonlinux/zfs
• https://github.com/kubernetes/kubernetes
• https://github.com/elastic/elasticsearch
• https://github.com/saltstack/salt

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packt.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.packt.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/-Hands-On-Linux-for-Architects. 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/9781789534108_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: "The two key points in this command are the address-prefix flag and the subnet-prefix flag."

A block of code is set as follows:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
 name: gluster-pvc  
spec:
 accessModes:
 - ReadWriteMany      
 resources:
    requests:
      storage: 1Gi  

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

 SHELL ["/bin/bash", "-c"]
 RUN echo "Hello I'm using bash" 

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

yum install -y zfs

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: "To confirm that data is being sent to the cluster, go to Discover on the kibana screen"