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: "The innodb_buffer_pool_size parameter is one of the most important parameters in MySQL."

A block of code is set as follows:

...
vm.swappiness = 5
...

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

[root]# zabbix_get -s localhost -k kernel.maxfiles
1512039

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "Choose the group that the hosts belong to, search for your host, and click on the Graphs link."