Conventions used

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: "I've put together the following Vagrantfile for use in this chapter."

A block of code is set as follows:

# -*- mode: ruby -*-
# vi: set ft=ruby :

$provisionScript = <<-SCRIPT
sed -i 's#PasswordAuthentication no#PasswordAuthentication yes#g' /etc/ssh/sshd_config
systemctl restart sshd
SCRIPT

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

[vagrant@centos2 ~]$ ip a
<SNIP>
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:56:c5:a7 brd ff:ff:ff:ff:ff:ff
    inet 192.168.33.11/24 brd 192.168.33.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe56:c5a7/64 scope link 
       valid_lft forever preferred_lft forever

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

[vagrant@centos1 ~]$ ssh centos2 -X

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: "The last thing to do from the main screen is set our INSTALLATION DESTINATION."