• The material in the book is designed to enable a hands-on approach. Throughout the book, a conscious effort has been made to provide all the relevant information to the reader beforehand so that, if the reader chooses, they can try to solve the problem on their own and then refer to the solution provided in the book.
• The code in the book does not have any Go dependencies beyond the standard library. This is done in order to ensure that the code examples provided in the book never change, and this also allows us to explore the standard library.
• The source code in the book should be placed at $GOPATH/src/distributed-go. The source code for examples given will be located inside the $GOPATH/src/distributed-go/chapterX folder, where X stands for the chapter number.
• Download and install Go from https://golang.org/ and Docker from https://www.docker.com/community-edition website

You can download the example code files for this book from your account at http://www.packtpub.com. If you purchased this book elsewhere, you can visit http://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 http://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 on-screen 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/Distributed-Computing-with-Go. 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/DistributedComputingwithGo_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. For example, "Now that we have all the code in place, let's build the Docker image using the Dockerfile file."

A block of code is set as follows:

// addInt.go 
 
package main 
 
func addInt(numbers ...int) int { 
    sum := 0 
    for _, num := range numbers { 
        sum += num 
    } 
    return sum 
} 

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

// addInt.go 
 
package main 
 
func addInt(numbers ...int) int { 
    sum := 0 
    for _, num := range numbers { 
        sum += num 
    } 
    return sum 
} 

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

$ cd docker

Bold: Indicates a new term, an important word, or words that you see on the screen, for example, in menus or dialog boxes, also appear in the text like this. For example, "Select System info from the Administration panel."