This document describes the guidelines for systemd services, for use and inclusion in Fedora packages.

  == Overview

  tmpfiles.d is a service for managing temporary files and runtime directories for daemons. In this guideline we mainly concentrate on how it is used to populate `+/run+` and `+/run/lock+`. Since `+/run+` is a `+tmpfs+` filesystem, it and its contents must be recreated on every reboot. For files intended to be created there, this should normally not pose any problems. However, directories will often need to be created ahead of time. This is best done using the tmpfiles.d mechanism.