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During early boot, mount a tmpfs to /dev/.run and then bind mount it to /var/run as soon as /var is available. This makes it possible for programs involved in early boot to put runtime data in /dev/.run which later on will show up in /var/run like any other. This can be used to solve the early-boot D-Bus problem: D-Bus may start up with its socket bound to /dev/.run/dbus/system_bus_socket and after /var it will also be available under the traditional name /var/run/dbus/system_bus_socket. This also is intended to be used as a better place for systemd, mount, mdadm, blkid, plymouth, bootchart and dracut runtime data, which is currently stored in various places in /dev/.xxx.
systemd System and Session Manager
DETAILS:
http://0pointer.de/blog/projects/systemd.html
WEB SITE:
http://www.freedesktop.org/wiki/Software/systemd
GIT:
git://anongit.freedesktop.org/systemd
ssh://git.freedesktop.org/git/systemd
GITWEB:
http://cgit.freedesktop.org/systemd/
MAILING LIST:
http://lists.freedesktop.org/mailman/listinfo/systemd-devel
http://lists.freedesktop.org/mailman/listinfo/systemd-commits
IRC:
#systemd on irc.freenode.org
BUG REPORTS:
https://bugs.freedesktop.org/enter_bug.cgi?product=systemd
AUTHOR:
Lennart Poettering with major support from Kay Sievers
REQUIREMENTS:
Linux kernel >= 2.6.30 (with devtmpfs, cgroups; optional but strongly recommended: autofs4, ipv6)
libudev >= 163
dbus >= 1.4.0
libcap
gtk+ >= 2.20 (optional)
PAM >= 1.1.2 (optional)
libcryptsetup (optional)
libaudit (optional)
libselinux (optional)
tcpwrappers (optional)
libnotify (optional)
When you build from git you need the following additional dependencies:
vala >= 0.10
docbook-xsl
xsltproc
automake
autoconf
libtool
make, gcc, and similar tools
During runtime you need the following dependencies:
util-linux > v2.18 (requires fsck -l, agetty -s)
sulogin (from sysvinit-tools, optional but recommended)
plymouth (optional)
dracut (optional)
WARNINGS:
systemd will warn you during boot if /etc/mtab is not a
symlink to /proc/mounts. Please ensure that /etc/mtab is a
proper symlink.
systemd will warn you during boot if /usr is on a different
file system than /. While in systemd itself very little will
break if /usr is on a separate partition many of its
dependencies very likely will break sooner or later in one
form or another. For example udev rules tend to refer to
binaries in /usr, binaries that link to libraries in /usr or
binaries that refer to data files in /usr. Since these
breakages are not always directly visible systemd will warn
about this, since this kind of file system setup is not really
supported anymore by the basic set of Linux OS components.
For more information on this issue consult
http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken
ENGINEERING AND CONSULTING SERVICES:
ProFUSION <http://profusion.mobi> offers professional
engineering and consulting services for systemd for embedded
and other use. Please contact Gustavo Barbieri
<barbieri@profusion.mobi> for more information.
Disclaimer: This notice is not a recommendation or official
endorsement. However, ProFUSION's upstream work has been very
beneficial for the systemd project.