Documentation Boot Beat

From FedoraProject

(Difference between revisions)
Jump to: navigation, search
(document /run change)
Line 2: Line 2:
 
{{Docs_beat_open}}
 
{{Docs_beat_open}}
 
{{Draft| '''NEED rewrite''': insert the '''boot options''', remove or move some contents to other places, perhaps split it}}
 
{{Draft| '''NEED rewrite''': insert the '''boot options''', remove or move some contents to other places, perhaps split it}}
= systemd =
+
 
 +
== 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.  
 
'''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.  
Line 10: Line 11:
 
Refer to https://fedoraproject.org/wiki/Systemd for more complete information on systemd in Fedora.  
 
Refer to https://fedoraproject.org/wiki/Systemd for more complete information on systemd in Fedora.  
  
= 4kB Sector disk boot support =
+
== /run directory =-
 
+
Booting 4kB sector disks in UEFI environments is now supported.
+
 
+
== /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 and the change including the benefits are explained in more detail [http://lists.fedoraproject.org/pipermail/devel/2011-March/150031.html here].
 
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 and the change including the benefits are explained in more detail [http://lists.fedoraproject.org/pipermail/devel/2011-March/150031.html here].
Line 23: Line 20:
  
 
http://fedoraproject.org/wiki/Packaging:Tmpfiles.d
 
http://fedoraproject.org/wiki/Packaging:Tmpfiles.d
 +
 +
== 4kB Sector disk boot support ==
 +
 +
Booting 4kB sector disks in UEFI environments is now supported.
 +
  
  

Revision as of 12:37, 30 March 2011

DocsProject Header docTeam1.png
Note.png
Beat is open
This beat is now ready to have Fedora 21 content added by the beat writer


Warning (medium size).png
This page is a draft only
It is still under construction and content may change. Do not rely on the information on this page. NEED rewrite: insert the boot options, remove or move some contents to other places, perhaps split it

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 .service files instead of bash script; all daemons are sorted into their own Linux cgroups, which you may explore beneath /cgroup/systemd in the file system hierarchy; administrative features of the init system are considerably extended.

Refer to https://fedoraproject.org/wiki/Systemd 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 and the change including the benefits are explained in more detail here.

/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 (http://0pointer.de/public/systemd-man/tmpfiles.d.html) and the conf files in /etc/tmpfiles.d for examples of such configuration. Fedora packaging guidelines for tmpfiles.d is at

http://fedoraproject.org/wiki/Packaging:Tmpfiles.d

4kB Sector disk boot support

Booting 4kB sector disks in UEFI environments is now supported.