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/shared/MurmurHash3.c which is Public Domain
  35         - except src/journal/lookup3.c which is Public Domain
  36         - except src/udev/* which is (currently still) GPLv2, GPLv2+
  37
  38 REQUIREMENTS:
  39         Linux kernel >= 3.0
  40           CONFIG_DEVTMPFS
  41           CONFIG_CGROUPS (it's OK to disable all controllers)
  42           CONFIG_INOTIFY_USER
  43           CONFIG_SIGNALFD
  44           CONFIG_TIMERFD
  45           CONFIG_EPOLL
  46           CONFIG_NET
  47           CONFIG_SYSFS
  48
  49         Linux kernel >= 3.8 for Smack support
  50
  51         Udev will fail to work with the legacy layout:
  52           CONFIG_SYSFS_DEPRECATED=n
  53
  54         Legacy hotplug slows down the system and confuses udev:
  55           CONFIG_UEVENT_HELPER_PATH=""
  56
  57         Userspace firmware loading is deprecated, will go away, and
  58         sometimes causes problems:
  59           CONFIG_FW_LOADER_USER_HELPER=n
  60
  61         Some udev rules and virtualization detection relies on it:
  62           CONFIG_DMIID
  63
  64         Mount and bind mount handling might require it:
  65           CONFIG_FHANDLE
  66
  67         Support for some SCSI devices serial number retrieval, to
  68         create additional symlinks in /dev/disk/ and /dev/tape:
  69           CONFIG_BLK_DEV_BSG
  70
  71         Optional but strongly recommended:
  72           CONFIG_IPV6
  73           CONFIG_AUTOFS4_FS
  74           CONFIG_TMPFS_POSIX_ACL
  75           CONFIG_TMPFS_XATTR
  76           CONFIG_SECCOMP
  77
  78         For systemd-bootchart, a kernel with procfs support and
  79         several proc output options enabled is required:
  80           CONFIG_PROC_FS
  81           CONFIG_SCHEDSTATS
  82           CONFIG_SCHED_DEBUG
  83
  84         For UEFI systems:
  85           CONFIG_EFI_VARS
  86           CONFIG_EFI_PARTITION
  87
  88         Note that kernel auditing is broken when used with systemd's
  89         container code. When using systemd in conjunction with
  90         containers, please make sure to either turn off auditing at
  91         runtime using the kernel command line option "audit=0", or
  92         turn it off at kernel compile time using:
  93           CONFIG_AUDIT=n
  94
  95         dbus >= 1.4.0
  96         libcap
  97         libblkid >= 2.20 (from util-linux) (optional)
  98         libkmod >= 15 (optional)
  99         PAM >= 1.1.2 (optional)
 100         libcryptsetup (optional)
 101         libaudit (optional)
 102         libacl (optional)
 103         libattr (optional)
 104         libselinux (optional)
 105         liblzma (optional)
 106         tcpwrappers (optional)
 107         libgcrypt (optional)
 108         libqrencode (optional)
 109         libmicrohttpd (optional)
 110         libpython (optional)
 111         make, gcc, and similar tools
 112
 113         During runtime, you need the following additional
 114         dependencies:
 115
 116         util-linux >= v2.19 (requires fsck -l, agetty -s)
 117         sulogin (from util-linux >= 2.22 or sysvinit-tools, optional but recommended)
 118         dracut (optional)
 119         PolicyKit (optional)
 120
 121         When building from git, you need the following additional
 122         dependencies:
 123
 124         docbook-xsl
 125         xsltproc
 126         automake
 127         autoconf
 128         libtool
 129         intltool
 130         gperf
 131         gtkdocize (optional)
 132         python (optional)
 133         sphinx (optional)
 134         python-lxml (entirely optional)
 135
 136         When systemd-hostnamed is used, it is strongly recommended to
 137         install nss-myhostname to ensure that, in a world of
 138         dynamically changing hostnames, the hostname stays resolvable
 139         under all circumstances. In fact, systemd-hostnamed will warn
 140         if nss-myhostname is not installed.
 141
 142         Note that D-Bus can link against libsystemd-login.so, which
 143         results in a cyclic build dependency. To accommodate for
 144         this, please build D-Bus without systemd first, then build
 145         systemd, then rebuild D-Bus with systemd support.
 146
 147         To build HTML documentation for python-systemd using sphinx,
 148         please first install systemd (using 'make install'), and then
 149         invoke sphinx-build with 'make sphinx-<target>', with <target>
 150         being 'html' or 'latexpdf'. If using DESTDIR for installation,
 151         pass the same DESTDIR to 'make sphinx-html' invocation.
 152
 153 USERS AND GROUPS:
 154         Default udev rules use the following standard system group
 155         names, which need to be resolvable by getgrnam() at any time,
 156         even in the very early boot stages, where no other databases
 157         and network are available:
 158
 159         tty, dialout, kmem, video, audio, lp, floppy, cdrom, tape, disk
 160
 161         During runtime, the journal daemon requires the
 162         "systemd-journal" system group to exist. New journal files will
 163         be readable by this group (but not writable), which may be used
 164         to grant specific users read access.
 165
 166         It is also recommended to grant read access to all journal
 167         files to the system groups "wheel" and "adm" with a command
 168         like the following in the post installation script of the
 169         package:
 170
 171         # setfacl -nm g:wheel:rx,d:g:wheel:rx,g:adm:rx,d:g:adm:rx /var/log/journal/
 172
 173         The journal gateway daemon requires the
 174         "systemd-journal-gateway" system user and group to
 175         exist. During execution this network facing service will drop
 176         privileges and assume this uid/gid for security reasons.
 177
 178 WARNINGS:
 179         systemd will warn you during boot if /etc/mtab is not a
 180         symlink to /proc/mounts. Please ensure that /etc/mtab is a
 181         proper symlink.
 182
 183         systemd will warn you during boot if /usr is on a different
 184         file system than /. While in systemd itself very little will
 185         break if /usr is on a separate partition, many of its
 186         dependencies very likely will break sooner or later in one
 187         form or another. For example, udev rules tend to refer to
 188         binaries in /usr, binaries that link to libraries in /usr or
 189         binaries that refer to data files in /usr. Since these
 190         breakages are not always directly visible, systemd will warn
 191         about this, since this kind of file system setup is not really
 192         supported anymore by the basic set of Linux OS components.
 193
 194         For more information on this issue consult
 195         http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken
 196
 197         To run systemd under valgrind, compile with VALGRIND defined
 198         (e.g. ./configure CPPFLAGS='... -DVALGRIND=1'). Otherwise,
 199         false positives will be triggered by code which violates
 200         some rules but is actually safe.