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File Name : 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 >= 3.7
        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 sysfs layout:
          CONFIG_SYSFS_DEPRECATED=n

Legacy hotplug slows down the system and confuses udev:
          CONFIG_UEVENT_HELPER_PATH=""

Userspace firmware loading is not supported and should
        be disabled in the kernel:
          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 and PrivateDevices in service units:
          CONFIG_NET_NS
          CONFIG_DEVPTS_MULTIPLE_INSTANCES
        Note that systemd-localed.service and other systemd units use
        PrivateNetwork and PrivateDevices so this is effectively required.

Optional but strongly recommended:
          CONFIG_IPV6
          CONFIG_AUTOFS4_FS
          CONFIG_TMPFS_XATTR
          CONFIG_{TMPFS,EXT4,XFS,BTRFS_FS,...}_POSIX_ACL
          CONFIG_SECCOMP

Required for CPUShares in resource control unit settings
          CONFIG_CGROUP_SCHED
          CONFIG_FAIR_GROUP_SCHED

Required for CPUQuota in resource control unit settings
          CONFIG_CFS_BANDWIDTH

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
        libmount >= 2.20 (from util-linux)
        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)
        libidn (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)
        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. In addition, system
        groups "wheel" and "adm" will be given read-only access to
        journal files using systemd-tmpfiles.service.

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.

NSS:
        systemd ships with three NSS modules:

nss-myhostname resolves the local hostname to locally
        configured IP addresses, as well as "localhost" to
        127.0.0.1/::1.

nss-resolve enables DNS resolution via the systemd-resolved
        DNS/LLMNR caching stub resolver "systemd-resolved".

nss-mymachines enables resolution of all local containers
        registered with machined to their respective IP addresses.

To make use of these NSS modules, please add them to the
        "hosts: " line in /etc/nsswitch.conf. The "resolve" module
        should replace the glibc "dns" module in this file.

The three modules should be used in the following order:

hosts: files mymachines resolve myhostname

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.

ENGINEERING AND CONSULTING SERVICES:
        ENDOCODE <https://endocode.com/> offers professional
        engineering and consulting services for systemd. Please
        contact Chris Kühl <chris@endocode.com> for more information.

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-07-03 07:13:55
..	dir	-	root/root	0755	2025-10-24 09:49:03
DIFFERENCES	text/plain	1.14 KB	root/root	0644	2024-03-26 12:56:27
DISTRO_PORTING	text/plain	1.29 KB	root/root	0644	2024-03-26 12:56:27
GVARIANT-SERIALIZATION	text/plain	4.27 KB	root/root	0644	2024-03-26 12:56:27
LICENSE.GPL2	text/plain	17.57 KB	root/root	0644	2024-03-26 12:56:27
LICENSE.LGPL2.1	text/plain	25.91 KB	root/root	0644	2024-03-26 12:56:27
LICENSE.MIT	text/plain	1023 B	root/root	0644	2024-03-26 12:56:27
NEWS	text/plain	226.93 KB	root/root	0644	2024-03-26 12:56:27
PORTING-DBUS1	text/plain	24.75 KB	root/root	0644	2024-03-26 12:56:27
README	text/plain	9.29 KB	root/root	0644	2024-03-26 12:56:27
sd-readahead.c	text/x-c	2.56 KB	root/root	0644	2024-03-26 12:56:27
sd-readahead.h	text/x-c	2.57 KB	root/root	0644	2024-03-26 12:56:27
sd-shutdown.h	text/x-c	3.74 KB	root/root	0644	2024-03-26 12:56:27

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