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README

systemd System and Service Manager

DETAILS:
http://0pointer.de/blog/projects/systemd.html

WEB SITE:
http://www.freedesktop.org/wiki/Software/systemd

GIT:
git://anongit.freedesktop.org/systemd/systemd
ssh://git.freedesktop.org/git/systemd/systemd

GITWEB:
http://cgit.freedesktop.org/systemd/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
Kay Sievers
...and many others

LICENSE:
LGPLv2.1+ for all code
- except sd-readahead.[ch] which is MIT
- except src/shared/MurmurHash2.c which is Public Domain
- except src/shared/siphash24.c which is CC0 Public Domain
- except src/journal/lookup3.c which is Public Domain
- except src/udev/* which is (currently still) GPLv2, GPLv2+

REQUIREMENTS:
Linux kernel >= 3.0
Linux kernel >= 3.3 for loop device partition support features with nspawn
Linux kernel >= 3.8 for Smack support

Kernel Config Options:
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

Required for CPUShares in resource control unit settings
CONFIG_CGROUP_SCHED
CONFIG_FAIR_GROUP_SCHED

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 32-bit 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)
libselinux (optional)
liblzma (optional)
liblz4 >= 119 (optional)
libgcrypt (optional)
libqrencode (optional)
libmicrohttpd (optional)
libpython (optional)
gobject-introspection > 1.40.0 (optional)
elfutils >= 158 (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:

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

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.

Similarly, the NTP daemon requires the "systemd-timesync" system
user and group to exist.

Similarly, the network management daemon requires the
"systemd-network" system user and group to exist.

Similarly, the name resolution daemon requires the
"systemd-resolve" system user and group to exist.

Similarly, the kdbus dbus1 proxy daemon requires the
"systemd-bus-proxy" system user and group to exist.

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 to /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.