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== systemd ==
'''systemd''' is a system and service manager,  replacement for SysVinit and Upstart. After a six months shift, during which it has been more granularly tested, Fedora 15 brings in, by default, a new system daemon whose code is designed from scratch, with the objective to take the maximum advantage offered by modern Linux kernel.
With '''systemd''', Fedora 15 boots-up faster, particularly on SSD; native systemd service configuration files (or units) are much easier to understand and configure compared to sysvinit scripts, as systemd uses <code>.service</code> files instead of bash script; all daemons are sorted into their own Linux cgroups, which you may explore beneath <code>/cgroup/systemd</code> in the file system hierarchy; administrative features of the init system are considerably extended.
Refer to for more complete information on systemd in Fedora.
== /run directory ==
Fedora 15 has a /run directory for storing runtime data.  /run is now a tmpfs, and /var/run is bind mounted to it. /var/lock is bind mounted to /run/lock. Applications can use /run the same way as /var/run.  Several programs including udev, dracut, mdadm, mount and initscripts used used hidden directories under /dev for runtime data during early bootup before /var is mounted.  However /dev/ is supposed to be used for only device nodes and there is consensus between major distributions to shift to using /run instead.  Fedora 15 is leading this change.  Details including the benefits are explained [ here].
This change ''is'' compliant with the [ Filesystem Hierarchy Standard], which allows distributions to create new directories in the root hierarchy as long as there is careful consideration of the consequences.  Co-author of the latest FHS specification has [ expressed support] for this change.  Lennart Poettering has filed a [ request] to update the FHS standard to include this change as well. 
== /var/run and /var/lock ==
/var/run and /var/lock are now bind mounted to /run and /run/lock from tmpfs, and hence emptied on reboot. Applications must ensure to recreate their own files/dirs on startup, and cannot rely that doing this at package installation will suffice. It is possible to use systemd's tmpfiles.d mechanism to recreate directories and files beneath /var/run and /var/lock on boot, if necessary. See tmpfiles.d(5) for details ( and the conf files in /etc/tmpfiles.d for examples of such configuration.  Fedora packaging guidelines for tmpfiles.d is at
== 4kB Sector disk boot support ==
Booting 4kB sector disks in UEFI environments is now supported.

Revision as of 03:15, 2 August 2011

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