In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: " In addition to the client package, you will also need the overcloudrc file from the undercloud."

A block of code is set as follows:

define service {
check_command check_nrpe!check_ovs_tunnel
host_name compute
service_description OVS tunnel connectivity
use generic-service
}

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

myhost# sudo ip addr add 192.0.2.222/24 dev bridget
myhost# sudo ip link set up dev bridget

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Click on Create User, and you're ready to start using the user's login and the new project."