9512fe850e98fdd448c638ca63fdd92a8a510255ahlsystemd System and Service Manager

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahlDETAILS:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl http://0pointer.de/blog/projects/systemd.html

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahlWEB SITE:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl http://www.freedesktop.org/wiki/Software/systemd

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahlGIT:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl git://anongit.freedesktop.org/systemd/systemd

9512fe850e98fdd448c638ca63fdd92a8a510255ahl ssh://git.freedesktop.org/git/systemd/systemd

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahlGITWEB:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl http://cgit.freedesktop.org/systemd/systemd

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahlMAILING LIST:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl http://lists.freedesktop.org/mailman/listinfo/systemd-devel

9512fe850e98fdd448c638ca63fdd92a8a510255ahl http://lists.freedesktop.org/mailman/listinfo/systemd-commits

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahlIRC:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl #systemd on irc.freenode.org

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahlBUG REPORTS:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl https://bugs.freedesktop.org/enter_bug.cgi?product=systemd

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahlAUTHOR:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl Lennart Poettering

9512fe850e98fdd448c638ca63fdd92a8a510255ahl Kay Sievers

9512fe850e98fdd448c638ca63fdd92a8a510255ahl ...and many others

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahlLICENSE:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl LGPLv2.1+ for all code

9512fe850e98fdd448c638ca63fdd92a8a510255ahl - except sd-readahead.[ch] which is MIT

9512fe850e98fdd448c638ca63fdd92a8a510255ahl - except src/shared/MurmurHash2.c which is Public Domain

9512fe850e98fdd448c638ca63fdd92a8a510255ahl - except src/shared/siphash24.c which is CC0 Public Domain

9512fe850e98fdd448c638ca63fdd92a8a510255ahl - except src/journal/lookup3.c which is Public Domain

9512fe850e98fdd448c638ca63fdd92a8a510255ahl - except src/udev/* which is (currently still) GPLv2, GPLv2+

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahlREQUIREMENTS:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl Linux kernel >= 3.0

9512fe850e98fdd448c638ca63fdd92a8a510255ahl Linux kernel >= 3.3 for loop device partition support features with nspawn

9512fe850e98fdd448c638ca63fdd92a8a510255ahl Linux kernel >= 3.8 for Smack support

9512fe850e98fdd448c638ca63fdd92a8a510255ahl

9512fe850e98fdd448c638ca63fdd92a8a510255ahl Kernel Config Options:

9512fe850e98fdd448c638ca63fdd92a8a510255ahl CONFIG_DEVTMPFS

CONFIG_CGROUPS (it is OK to disable all controllers)

CONFIG_INOTIFY_USER

CONFIG_SIGNALFD

CONFIG_TIMERFD

CONFIG_EPOLL

CONFIG_NET

CONFIG_SYSFS

CONFIG_PROC_FS

CONFIG_FHANDLE (libudev, mount and bind mount handling)

Udev will fail to work with the legacy layout:

CONFIG_SYSFS_DEPRECATED=n

Legacy hotplug slows down the system and confuses udev:

CONFIG_UEVENT_HELPER_PATH=""

Userspace firmware loading is deprecated, will go away, and

sometimes causes problems:

CONFIG_FW_LOADER_USER_HELPER=n

Some udev rules and virtualization detection relies on it:

CONFIG_DMIID

Support for some SCSI devices serial number retrieval, to

create additional symlinks in /dev/disk/ and /dev/tape:

CONFIG_BLK_DEV_BSG

Required for PrivateNetwork in service units:

CONFIG_NET_NS

Optional but strongly recommended:

CONFIG_IPV6

CONFIG_AUTOFS4_FS

CONFIG_TMPFS_POSIX_ACL

CONFIG_TMPFS_XATTR

CONFIG_SECCOMP

For systemd-bootchart, several proc debug interfaces are required:

CONFIG_SCHEDSTATS

CONFIG_SCHED_DEBUG

For UEFI systems:

CONFIG_EFIVAR_FS

CONFIG_EFI_PARTITION

Note that kernel auditing is broken when used with systemd's

container code. When using systemd in conjunction with

containers, please make sure to either turn off auditing at

runtime using the kernel command line option "audit=0", or

turn it off at kernel compile time using:

CONFIG_AUDIT=n

If systemd is compiled with libseccomp support on

architectures which do not use socketcall() and where seccomp

is supported (this effectively means x86-64 and ARM, but

excludes 32bit x86!), then nspawn will now install a

work-around seccomp filter that makes containers boot even

with audit being enabled. This works correctly only on kernels

3.14 and newer though. TL;DR: turn audit off, still.

glibc >= 2.14

libcap

libseccomp >= 1.0.0 (optional)

libblkid >= 2.20 (from util-linux) (optional)

libkmod >= 15 (optional)

PAM >= 1.1.2 (optional)

libcryptsetup (optional)

libaudit (optional)

libacl (optional)

libattr (optional)

libselinux (optional)

liblzma (optional)

libgcrypt (optional)

libqrencode (optional)

libmicrohttpd (optional)

libpython (optional)

make, gcc, and similar tools

During runtime, you need the following additional

dependencies:

util-linux >= v2.19 (requires fsck -l, agetty -s),

v2.21 required for tests in test/

dbus >= 1.4.0 (strictly speaking optional, but recommended)

sulogin (from util-linux >= 2.22 or sysvinit-tools, optional but recommended,

required for tests in test/)

dracut (optional)

PolicyKit (optional)

When building from git, you need the following additional

dependencies:

docbook-xsl

xsltproc

automake

autoconf

libtool

intltool

gperf

gtkdocize (optional)

python (optional)

python-lxml (optional, but required to build the indices)

sphinx (optional)

When systemd-hostnamed is used, it is strongly recommended to

install nss-myhostname to ensure that, in a world of

dynamically changing hostnames, the hostname stays resolvable

under all circumstances. In fact, systemd-hostnamed will warn

if nss-myhostname is not installed.

To build HTML documentation for python-systemd using sphinx,

please first install systemd (using 'make install'), and then

invoke sphinx-build with 'make sphinx-<target>', with <target>

being 'html' or 'latexpdf'. If using DESTDIR for installation,

pass the same DESTDIR to 'make sphinx-html' invocation.

USERS AND GROUPS:

Default udev rules use the following standard system group

names, which need to be resolvable by getgrnam() at any time,

even in the very early boot stages, where no other databases

and network are available:

tty, dialout, kmem, video, audio, lp, floppy, cdrom, tape, disk

During runtime, the journal daemon requires the

"systemd-journal" system group to exist. New journal files will

be readable by this group (but not writable), which may be used

to grant specific users read access.

It is also recommended to grant read access to all journal

files to the system groups "wheel" and "adm" with a command

like the following in the post installation script of the

package:

# setfacl -nm g:wheel:rx,d:g:wheel:rx,g:adm:rx,d:g:adm:rx /var/log/journal/

The journal gateway daemon requires the

"systemd-journal-gateway" system user and group to

exist. During execution this network facing service will drop

privileges and assume this uid/gid for security reasons.

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.

systemd requires that the /run mount point exists. systemd also

requires that /var/run is a a symlink → /run.

For more information on this issue consult

http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken

To run systemd under valgrind, compile with VALGRIND defined

(e.g. ./configure CPPFLAGS='... -DVALGRIND=1'). Otherwise,

false positives will be triggered by code which violates

some rules but is actually safe.