README

   1 systemd System and Service Manager
   2
   3 DETAILS:
   4         http://0pointer.de/blog/projects/systemd.html
   5
   6 WEB SITE:
   7         http://www.freedesktop.org/wiki/Software/systemd
   8
   9 GIT:
  10         git://anongit.freedesktop.org/systemd/systemd
  11         ssh://git.freedesktop.org/git/systemd/systemd
  12
  13 GITWEB:
  14         http://cgit.freedesktop.org/systemd/systemd
  15
  16 MAILING LIST:
  17         http://lists.freedesktop.org/mailman/listinfo/systemd-devel
  18         http://lists.freedesktop.org/mailman/listinfo/systemd-commits
  19
  20 IRC:
  21         #systemd on irc.freenode.org
  22
  23 BUG REPORTS:
  24         https://bugs.freedesktop.org/enter_bug.cgi?product=systemd
  25
  26 AUTHOR:
  27         Lennart Poettering
  28         Kay Sievers
  29         ...and many others
  30
  31 LICENSE:
  32         LGPLv2.1+ for all code
  33         - except sd-daemon.[ch] and sd-readahead.[ch] which are MIT
  34         - except src/udev/ which is (currently still) GPLv2+
  35
  36 REQUIREMENTS:
  37         Linux kernel >= 2.6.39
  38           CONFIG_DEVTMPFS
  39           CONFIG_CGROUPS (it's OK to disable all controllers)
  40           CONFIG_INOTIFY_USER
  41           CONFIG_SIGNALFD
  42           CONFIG_TIMERFD
  43           CONFIG_EPOLL
  44           CONFIG_NET
  45           CONFIG_SYSFS
  46
  47         Linux kernel >= 3.8 for Smack support
  48
  49         Udev will fail to work with the legacy layout:
  50           CONFIG_SYSFS_DEPRECATED=n
  51
  52         Legacy hotplug slows down the system and confuses udev:
  53           CONFIG_UEVENT_HELPER_PATH=""
  54
  55         Userspace firmware loading is deprecated, will go away, and
  56         sometimes causes problems:
  57           CONFIG_FW_LOADER_USER_HELPER=n
  58
  59         Some udev rules and virtualization detection relies on it:
  60           CONFIG_DMIID
  61
  62         Mount and bind mount handling might require it:
  63           CONFIG_FHANDLE
  64
  65         Optional but strongly recommended:
  66           CONFIG_IPV6
  67           CONFIG_AUTOFS4_FS
  68           CONFIG_TMPFS_POSIX_ACL
  69           CONFIG_TMPFS_XATTR
  70           CONFIG_SECCOMP
  71
  72         For systemd-bootchart a kernel with procfs support and several
  73         proc output options enabled is required:
  74           CONFIG_PROC_FS
  75           CONFIG_SCHEDSTATS
  76           CONFIG_SCHED_DEBUG
  77
  78         For UEFI systems:
  79           CONFIG_EFI_VARS
  80           CONFIG_EFI_PARTITION
  81
  82         dbus >= 1.4.0
  83         libcap
  84         libblkid >= 2.20 (from util-linux) (optional)
  85         libkmod >= 5 (optional)
  86         PAM >= 1.1.2 (optional)
  87         libcryptsetup (optional)
  88         libaudit (optional)
  89         libacl (optional)
  90         libattr (optional)
  91         libselinux (optional)
  92         liblzma (optional)
  93         tcpwrappers (optional)
  94         libgcrypt (optional)
  95         libqrencode (optional)
  96         libmicrohttpd (optional)
  97         libpython (optional)
  98         make, gcc, and similar tools
  99
 100         During runtime you need the following additional dependencies:
 101
 102         util-linux >= v2.19 (requires fsck -l, agetty -s)
 103         sulogin (from util-linux >= 2.22 or sysvinit-tools, optional but recommended)
 104         dracut (optional)
 105         PolicyKit (optional)
 106
 107         When building from git you need the following additional dependencies:
 108
 109         docbook-xsl
 110         xsltproc
 111         automake
 112         autoconf
 113         libtool
 114         intltool
 115         gperf
 116         gtkdocize (optional)
 117         python (optional)
 118         sphinx (optional)
 119         python-lxml (entirely optional)
 120
 121         When systemd-hostnamed is used it is strongly recommended to
 122         install nss-myhostname to ensure that in a world of
 123         dynamically changing hostnames the hostname stays resolvable
 124         under all circumstances. In fact, systemd-hostnamed will warn
 125         if nss-myhostname is not installed.
 126
 127         Note that D-Bus can link against libsystemd-login.so, which
 128         results in a cyclic build dependency. To accommodate for this
 129         please build D-Bus without systemd first, then build systemd,
 130         then rebuild D-Bus with systemd support.
 131
 132         To build HTML documentation for python-systemd using sphinx,
 133         please first install systemd (using 'make install'), and then
 134         invoke sphinx-build with 'make sphinx-<target>', with <target>
 135         being 'html' or 'latexpdf'. If using DESTDIR for installation,
 136         pass the same DESTDIR to 'make sphinx-html' invocation.
 137
 138 USERS AND GROUPS:
 139         Default udev rules use the following standard system group
 140         names, which need to be resolvable by getgrnam() at any time,
 141         even in the very early boot stages, where no other databases
 142         and network are available:
 143
 144         tty, dialout, kmem, video, audio, lp, floppy, cdrom, tape, disk
 145
 146         During runtime the journal daemon requires the
 147         "systemd-journal" system group to exist. New journal files will
 148         be readable by this group (but not writable) which may be used
 149         to grant specific users read access.
 150
 151         It is also recommended to grant read access to all journal
 152         files to the system groups "wheel" and "adm" with a command
 153         like the following in the post installation script of the
 154         package:
 155
 156         # setfacl -nm g:wheel:rx,d:g:wheel:rx,g:adm:rx,d:g:adm:rx /var/log/journal/
 157
 158         The journal gateway daemon requires the
 159         "systemd-journal-gateway" system user and group to
 160         exist. During execution this network facing service will drop
 161         privileges and assume this uid/gid for security reasons.
 162
 163 WARNINGS:
 164         systemd will warn you during boot if /etc/mtab is not a
 165         symlink to /proc/mounts. Please ensure that /etc/mtab is a
 166         proper symlink.
 167
 168         systemd will warn you during boot if /usr is on a different
 169         file system than /. While in systemd itself very little will
 170         break if /usr is on a separate partition many of its
 171         dependencies very likely will break sooner or later in one
 172         form or another. For example udev rules tend to refer to
 173         binaries in /usr, binaries that link to libraries in /usr or
 174         binaries that refer to data files in /usr. Since these
 175         breakages are not always directly visible systemd will warn
 176         about this, since this kind of file system setup is not really
 177         supported anymore by the basic set of Linux OS components.
 178
 179         For more information on this issue consult
 180         http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken
 181
 182         To run systemd under valgrind, compile with VALGRIND defined
 183         (e.g. ./configure CPPFLAGS='... -DVALGRIND=1'). Otherwise,
 184         false positives will be triggered by code which violates
 185         some rules but is actually safe.