The /etc/haproxy/haproxy.cfg configuration file is divided into the following sections:

global

Defines global settings, such as the syslog facility and level to use for logging, the maximum number of concurrent connections that are allowed, and how many processes to start in daemon mode.

defaults

Defines the default settings for the other sections.

listen

Defines a complete proxy, which implicitly includes the frontend and backend components.

frontend

Defines the ports that accept client connections.

backend

Defines the servers to which the proxy forwards client connections.