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This also allows the system to create all sockets early in the boot process, making it possible to boot the associated services in parallel. This provides a number of advantages, such as delaying the start of a service until the associated socket is first accessed.

socket-based activation: Sockets associated with a service are best broken out of the daemon itself in order to be handled separately.

Some features that units are able implement easily are: This organizes by function and allows you to easily enable, disable, or extend functionality without modifying the core behavior of a unit. Ideas that in other init systems may be handled with one unified service definition can be broken out into component units according to their focus. However, a unit has a much broader definition, as these can be used to abstract services, network resources, devices, filesystem mounts, and isolated resource pools. Units can be said to be similar to services or jobs in other init systems. These are basically a standardized representation of system resources that can be managed by the suite of daemons and manipulated by the provided utilities.

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Units are the objects that systemd knows how to manage.

We will also be covering some of the many directives that can be used in unit files in order to shape the way these resources are handled on your system. In this guide, we will introduce you to the different units that systemd can handle. These resources are defined using configuration files called unit files. This is the primary object that the systemd tools know how to deal with. In systemd, a unit refers to any resource that the system knows how to operate on and manage. This powerful suite of software can manage many aspects of your server, from services to mounted devices and system states. Increasingly, Linux distributions are adopting the systemd init system.