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: "We have the dpkg dependency management tool for installing RabbitMQ."

A block of code is set as follows:

tcp {
  upstream cluster {
    # simple round-robin
    server 192.168.1.1:5672;
    server 192.168.1.2:5672;
    check interval=3000 rise=2 fall=5 timeout=1000;
  }
  server {
    listen 5672;
    proxy_pass cluster;
  }
}

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

mastering-rabbitmq1$ rabbitmqctl cluster_status
Cluster status of node rabbit@mastering-rabbitmq1 ...
[{nodes,[{disc,[rabbit@mastering-rabbitmq1]}]},
 {running_nodes,[rabbit@mastering-rabbitmq1]},
 {partitions,[]}]
...done.

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: "In Windows, we should use the environment variables of the System Properties for modifying the environment variables of RabbitMQ."