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: "To do this, we need to edit /etc/nova/nova.conf on the OpenStack node and add the following perform the steps that are given in the following section."

A block of code is set as follows:

inject_partition=-2
images_type=rbd
images_rbd_pool=vms
images_rbd_ceph_conf=/etc/ceph/ceph.conf

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

inject_partition=-2
images_type=rbd
images_rbd_pool=vms
images_rbd_ceph_conf=/etc/ceph/ceph.conf

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

# rados -p cache-pool ls

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: "Navigate to the Options defined in nova.virt.libvirt.volume section and add the following lines of code:"