Understanding Systemd Units and Unit Files

**Understanding Systemd Units and Unit Files**

Introduction Linux distributions widely use the systemd init system to manage services, devices, mounts, and boot states. In systemd, a unit is any resource the system knows how to operate on and manage. Units are defined by configuration files called unit files. This guide explains what systemd units and unit files are, where they live, how to author and customize them, and how to manage and troubleshoot them using systemctl, journalctl, and systemd-analyze. For day-to-day service control, see How To Use systemctl to Manage systemd Services and Units...

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