Conventions

In this book, you will find a number of styles of text 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: "You can find this configuration in the /etc/nova/policy.json file."

A block of code is set as follows:

<VirtualHost <ip address>:80>
  ServerName <site FQDN>
  RedirectPermanent / https://<site FQDN>/
</VirtualHost>

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

policy_module(keystonewsgi, 1.0.0)

require {
  type httpd_t;
  type keystone_var_lib_t;
}

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

$ echo "password" | md5sum
286755fad04869ca523320acce0dc6a4  -

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.