To get the most out of this book, you should have access to a Linux or macOS machine, have an internet connection, and have Amazon AWS, Google, and Microsoft Azure accounts. These are all necessary to run the examples.

Some basic IT knowledge is necessary to read this book. The subjects you need experience in are as follows:

• Linux
• Shell scripting
• Basic programming skills in Ruby and JavaScript
• A basic understanding of Docker containers
• A basic understanding of using Terraform to create infrastructure as code
• A basic understanding of Ansible

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.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.packt.com.
2. Select the Support tab.
3. Click on Code Downloads.
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/Mastering-GitLab-12. 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!

Visit the following link to see the code being executed:

http://bit.ly/2KirIoO

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://static.packt-cdn.com/downloads/9781789531282_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: "Let's continue with installing web documents in /usr/local/www."

A block of code is set as follows:

server {
listen 8080;
server_name localhost;

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

server {
listen 8080;
server_name localhost;

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

$mkdir /usr/local/www
$chmod 755 /usr/local/www
$cd /usr/local/www

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: "You can do this by clicking the Choose File button near the Logo section."