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<refentry id= "systemd-system.conf"
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xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo >
<title > systemd-system.conf</title>
<productname > systemd</productname>
</refentryinfo>
<refmeta >
<refentrytitle > systemd-system.conf</refentrytitle>
<manvolnum > 5</manvolnum>
</refmeta>
<refnamediv >
<refname > systemd-system.conf</refname>
<refname > system.conf.d</refname>
<refname > systemd-user.conf</refname>
<refname > user.conf.d</refname>
<refpurpose > System and session service manager configuration files</refpurpose>
</refnamediv>
<refsynopsisdiv >
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<para > <filename > /etc/systemd/system.conf</filename> ,
<filename > /etc/systemd/system.conf.d/*.conf</filename> ,
<filename > /run/systemd/system.conf.d/*.conf</filename> ,
<filename > /usr/lib/systemd/system.conf.d/*.conf</filename> </para>
<para > <filename > /etc/systemd/user.conf</filename> ,
<filename > /etc/systemd/user.conf.d/*.conf</filename> ,
<filename > /run/systemd/user.conf.d/*.conf</filename> ,
<filename > /usr/lib/systemd/user.conf.d/*.conf</filename> </para>
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</refsynopsisdiv>
<refsect1 >
<title > Description</title>
<para > When run as a system instance, systemd interprets the
configuration file <filename > system.conf</filename> and the files
in <filename > system.conf.d</filename> directories; when run as a
user instance, systemd interprets the configuration file
<filename > user.conf</filename> and the files in
<filename > user.conf.d</filename> directories. These configuration
files contain a few settings controlling basic manager
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operations. See
<citerefentry > <refentrytitle > systemd.syntax</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry>
for a general description of the syntax.</para>
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</refsect1>
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<xi:include href= "standard-conf.xml" xpointer= "main-conf" />
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<refsect1 >
<title > Options</title>
<para > All options are configured in the
<literal > [Manager]</literal> section:</para>
<variablelist class= 'systemd-directives' >
<varlistentry >
<term > <varname > LogLevel=</varname> </term>
<term > <varname > LogTarget=</varname> </term>
<term > <varname > LogColor=</varname> </term>
<term > <varname > LogLocation=</varname> </term>
<term > <varname > DumpCore=yes</varname> </term>
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<term > <varname > CrashChangeVT=no</varname> </term>
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<term > <varname > CrashShell=no</varname> </term>
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<term > <varname > CrashReboot=no</varname> </term>
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<term > <varname > ShowStatus=yes</varname> </term>
<term > <varname > DefaultStandardOutput=journal</varname> </term>
<term > <varname > DefaultStandardError=inherit</varname> </term>
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<listitem > <para > Configures various parameters of basic manager operation. These options may be overridden by
the respective process and kernel command line arguments. See
<citerefentry > <refentrytitle > systemd</refentrytitle> <manvolnum > 1</manvolnum> </citerefentry> for
details.</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <varname > CtrlAltDelBurstAction=</varname> </term>
<listitem > <para > Defines what action will be performed
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if user presses Ctrl-Alt-Delete more than 7 times in 2s.
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Can be set to <literal > reboot-force</literal> , <literal > poweroff-force</literal> ,
<literal > reboot-immediate</literal> , <literal > poweroff-immediate</literal>
or disabled with <literal > none</literal> . Defaults to
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<literal > reboot-force</literal> .
</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <varname > CPUAffinity=</varname> </term>
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<listitem > <para > Configures the CPU affinity for the service manager as well as the default CPU affinity for all
forked off processes. Takes a list of CPU indices or ranges separated by either whitespace or commas. CPU
ranges are specified by the lower and upper CPU indices separated by a dash. Individual services may override
the CPU affinity for their processes with the <varname > CPUAffinity=</varname> setting in unit files, see
<citerefentry > <refentrytitle > systemd.exec</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry> .</para> </listitem>
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</varlistentry>
<varlistentry >
<term > <varname > RuntimeWatchdogSec=</varname> </term>
<term > <varname > ShutdownWatchdogSec=</varname> </term>
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<listitem > <para > Configure the hardware watchdog at runtime and at reboot. Takes a timeout value in seconds (or
in other time units if suffixed with <literal > ms</literal> , <literal > min</literal> , <literal > h</literal> ,
<literal > d</literal> , <literal > w</literal> ). If <varname > RuntimeWatchdogSec=</varname> is set to a non-zero
value, the watchdog hardware (<filename > /dev/watchdog</filename> or the path specified with
<varname > WatchdogDevice=</varname> or the kernel option <varname > systemd.watchdog-device=</varname> ) will be
programmed to automatically reboot the system if it is not contacted within the specified timeout interval. The
system manager will ensure to contact it at least once in half the specified timeout interval. This feature
requires a hardware watchdog device to be present, as it is commonly the case in embedded and server
systems. Not all hardware watchdogs allow configuration of all possible reboot timeout values, in which case
the closest available timeout is picked. <varname > ShutdownWatchdogSec=</varname> may be used to configure the
hardware watchdog when the system is asked to reboot. It works as a safety net to ensure that the reboot takes
place even if a clean reboot attempt times out. Note that the <varname > ShutdownWatchdogSec=</varname> timeout
applies only to the second phase of the reboot, i.e. after all regular services are already terminated, and
after the system and service manager process (PID 1) got replaced by the <filename > systemd-shutdown</filename>
binary, see system <citerefentry > <refentrytitle > bootup</refentrytitle> <manvolnum > 7</manvolnum> </citerefentry>
for details. During the first phase of the shutdown operation the system and service manager remains running
and hence <varname > RuntimeWatchdogSec=</varname> is still honoured. In order to define a timeout on this first
phase of system shutdown, configure <varname > JobTimeoutSec=</varname> and <varname > JobTimeoutAction=</varname>
in the <literal > [Unit]</literal> section of the <filename > shutdown.target</filename> unit. By default
<varname > RuntimeWatchdogSec=</varname> defaults to 0 (off), and <varname > ShutdownWatchdogSec=</varname> to
10min. These settings have no effect if a hardware watchdog is not available.</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <varname > WatchdogDevice=</varname> </term>
<listitem > <para > Configure the hardware watchdog device that the
runtime and shutdown watchdog timers will open and use. Defaults
to <filename > /dev/watchdog</filename> . This setting has no
effect if a hardware watchdog is not available.</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <varname > CapabilityBoundingSet=</varname> </term>
<listitem > <para > Controls which capabilities to include in the
capability bounding set for PID 1 and its children. See
<citerefentry project= 'man-pages' > <refentrytitle > capabilities</refentrytitle> <manvolnum > 7</manvolnum> </citerefentry>
for details. Takes a whitespace-separated list of capability
names as read by
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<citerefentry project= 'mankier' > <refentrytitle > cap_from_name</refentrytitle> <manvolnum > 3</manvolnum> </citerefentry> .
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Capabilities listed will be included in the bounding set, all
others are removed. If the list of capabilities is prefixed
with ~, all but the listed capabilities will be included, the
effect of the assignment inverted. Note that this option also
affects the respective capabilities in the effective,
permitted and inheritable capability sets. The capability
bounding set may also be individually configured for units
using the <varname > CapabilityBoundingSet=</varname> directive
for units, but note that capabilities dropped for PID 1 cannot
be regained in individual units, they are lost for
good.</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <varname > NoNewPrivileges=</varname> </term>
<listitem > <para > Takes a boolean argument. If true, ensures that PID 1
and all its children can never gain new privileges through
<citerefentry project= 'man-pages' > <refentrytitle > execve</refentrytitle> <manvolnum > 2</manvolnum> </citerefentry>
(e.g. via setuid or setgid bits, or filesystem capabilities).
Defaults to false. General purpose distributions commonly rely
on executables with setuid or setgid bits and will thus not
function properly with this option enabled. Individual units
cannot disable this option.
Also see <ulink url= "https://www.kernel.org/doc/html/latest/userspace-api/no_new_privs.html" > No New Privileges Flag</ulink> .
</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <varname > SystemCallArchitectures=</varname> </term>
<listitem > <para > Takes a space-separated list of architecture
identifiers. Selects from which architectures system calls may
be invoked on this system. This may be used as an effective
way to disable invocation of non-native binaries system-wide,
for example to prohibit execution of 32-bit x86 binaries on
64-bit x86-64 systems. This option operates system-wide, and
acts similar to the
<varname > SystemCallArchitectures=</varname> setting of unit
files, see
<citerefentry > <refentrytitle > systemd.exec</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry>
for details. This setting defaults to the empty list, in which
case no filtering of system calls based on architecture is
applied. Known architecture identifiers are
<literal > x86</literal> , <literal > x86-64</literal> ,
<literal > x32</literal> , <literal > arm</literal> and the special
identifier <literal > native</literal> . The latter implicitly
maps to the native architecture of the system (or more
specifically, the architecture the system manager was compiled
for). Set this setting to <literal > native</literal> to
prohibit execution of any non-native binaries. When a binary
executes a system call of an architecture that is not listed
in this setting, it will be immediately terminated with the
SIGSYS signal.</para> </listitem>
</varlistentry>
<varlistentry >
<term > <varname > TimerSlackNSec=</varname> </term>
<listitem > <para > Sets the timer slack in nanoseconds for PID 1,
which is inherited by all executed processes, unless
overridden individually, for example with the
<varname > TimerSlackNSec=</varname> setting in service units
(for details see
<citerefentry > <refentrytitle > systemd.exec</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry> ).
The timer slack controls the accuracy of wake-ups triggered by
system timers. See
<citerefentry > <refentrytitle > prctl</refentrytitle> <manvolnum > 2</manvolnum> </citerefentry>
for more information. Note that in contrast to most other time
span definitions this parameter takes an integer value in
nano-seconds if no unit is specified. The usual time units are
understood too.</para> </listitem>
</varlistentry>
<varlistentry >
<term > <varname > DefaultTimerAccuracySec=</varname> </term>
<listitem > <para > Sets the default accuracy of timer units. This
controls the global default for the
<varname > AccuracySec=</varname> setting of timer units, see
<citerefentry > <refentrytitle > systemd.timer</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry>
for details. <varname > AccuracySec=</varname> set in individual
units override the global default for the specific unit.
Defaults to 1min. Note that the accuracy of timer units is
also affected by the configured timer slack for PID 1, see
<varname > TimerSlackNSec=</varname> above.</para> </listitem>
</varlistentry>
<varlistentry >
<term > <varname > DefaultTimeoutStartSec=</varname> </term>
<term > <varname > DefaultTimeoutStopSec=</varname> </term>
<term > <varname > DefaultRestartSec=</varname> </term>
<listitem > <para > Configures the default timeouts for starting
and stopping of units, as well as the default time to sleep
between automatic restarts of units, as configured per-unit in
<varname > TimeoutStartSec=</varname> ,
<varname > TimeoutStopSec=</varname> and
<varname > RestartSec=</varname> (for services, see
<citerefentry > <refentrytitle > systemd.service</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry>
for details on the per-unit settings). For non-service units,
<varname > DefaultTimeoutStartSec=</varname> sets the default
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<varname > TimeoutSec=</varname>
value. <varname > DefaultTimeoutStartSec=</varname> and
<varname > DefaultTimeoutStopSec=</varname> default to
90s. <varname > DefaultRestartSec=</varname> defaults to
100ms.</para> </listitem>
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</varlistentry>
<varlistentry >
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<term > <varname > DefaultStartLimitIntervalSec=</varname> </term>
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<term > <varname > DefaultStartLimitBurst=</varname> </term>
<listitem > <para > Configure the default unit start rate
limiting, as configured per-service by
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<varname > StartLimitIntervalSec=</varname> and
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<varname > StartLimitBurst=</varname> . See
<citerefentry > <refentrytitle > systemd.service</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry>
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for details on the per-service settings.
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<varname > DefaultStartLimitIntervalSec=</varname> defaults to
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10s. <varname > DefaultStartLimitBurst=</varname> defaults to
5.</para> </listitem>
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</varlistentry>
<varlistentry >
<term > <varname > DefaultEnvironment=</varname> </term>
<listitem > <para > Sets manager environment variables passed to
all executed processes. Takes a space-separated list of
variable assignments. See
<citerefentry project= 'man-pages' > <refentrytitle > environ</refentrytitle> <manvolnum > 7</manvolnum> </citerefentry>
for details about environment variables.</para>
<para > Example:
<programlisting > DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"</programlisting>
Sets three variables
<literal > VAR1</literal> ,
<literal > VAR2</literal> ,
<literal > VAR3</literal> .</para> </listitem>
</varlistentry>
<varlistentry >
<term > <varname > DefaultCPUAccounting=</varname> </term>
<term > <varname > DefaultBlockIOAccounting=</varname> </term>
<term > <varname > DefaultMemoryAccounting=</varname> </term>
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<term > <varname > DefaultTasksAccounting=</varname> </term>
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<term > <varname > DefaultIOAccounting=</varname> </term>
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<term > <varname > DefaultIPAccounting=</varname> </term>
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<listitem > <para > Configure the default resource accounting settings, as configured per-unit by
<varname > CPUAccounting=</varname> , <varname > BlockIOAccounting=</varname> , <varname > MemoryAccounting=</varname> ,
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<varname > TasksAccounting=</varname> , <varname > IOAccounting=</varname> and <varname > IPAccounting=</varname> . See
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<citerefentry > <refentrytitle > systemd.resource-control</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry>
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for details on the per-unit settings. <varname > DefaultTasksAccounting=</varname> defaults to yes,
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<varname > DefaultMemoryAccounting=</varname> to &MEMORY_ACCOUNTING_DEFAULT; . <varname > DefaultCPUAccounting=</varname>
defaults to yes if enabling CPU accounting doesn't require the CPU controller to be enabled (Linux 4.15+ using the
unified hierarchy for resource control), otherwise it defaults to no. The other three settings default to no.</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <varname > DefaultTasksMax=</varname> </term>
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<listitem > <para > Configure the default value for the per-unit <varname > TasksMax=</varname> setting. See
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<citerefentry > <refentrytitle > systemd.resource-control</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry>
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for details. This setting applies to all unit types that support resource control settings, with the exception
of slice units. Defaults to 15%, which equals 4915 with the kernel's defaults on the host, but might be smaller
in OS containers.</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <varname > DefaultLimitCPU=</varname> </term>
<term > <varname > DefaultLimitFSIZE=</varname> </term>
<term > <varname > DefaultLimitDATA=</varname> </term>
<term > <varname > DefaultLimitSTACK=</varname> </term>
<term > <varname > DefaultLimitCORE=</varname> </term>
<term > <varname > DefaultLimitRSS=</varname> </term>
<term > <varname > DefaultLimitNOFILE=</varname> </term>
<term > <varname > DefaultLimitAS=</varname> </term>
<term > <varname > DefaultLimitNPROC=</varname> </term>
<term > <varname > DefaultLimitMEMLOCK=</varname> </term>
<term > <varname > DefaultLimitLOCKS=</varname> </term>
<term > <varname > DefaultLimitSIGPENDING=</varname> </term>
<term > <varname > DefaultLimitMSGQUEUE=</varname> </term>
<term > <varname > DefaultLimitNICE=</varname> </term>
<term > <varname > DefaultLimitRTPRIO=</varname> </term>
<term > <varname > DefaultLimitRTTIME=</varname> </term>
<listitem > <para > These settings control various default
resource limits for units. See
<citerefentry > <refentrytitle > setrlimit</refentrytitle> <manvolnum > 2</manvolnum> </citerefentry>
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for details. The resource limit is possible to specify in two formats,
<option > value</option> to set soft and hard limits to the same value,
or <option > soft:hard</option> to set both limits individually (e.g. DefaultLimitAS=4G:16G).
Use the string <varname > infinity</varname> to
configure no limit on a specific resource. The multiplicative
suffixes K (=1024), M (=1024*1024) and so on for G, T, P and E
may be used for resource limits measured in bytes
(e.g. DefaultLimitAS=16G). For the limits referring to time values,
the usual time units ms, s, min, h and so on may be used (see
<citerefentry > <refentrytitle > systemd.time</refentrytitle> <manvolnum > 7</manvolnum> </citerefentry>
for details). Note that if no time unit is specified for
<varname > DefaultLimitCPU=</varname> the default unit of seconds is
implied, while for <varname > DefaultLimitRTTIME=</varname> the default
unit of microseconds is implied. Also, note that the effective
granularity of the limits might influence their
enforcement. For example, time limits specified for
<varname > DefaultLimitCPU=</varname> will be rounded up implicitly to
multiples of 1s. These settings may be overridden in individual units
using the corresponding LimitXXX= directives. Note that these resource
limits are only defaults for units, they are not applied to PID 1
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itself.</para> </listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 >
<title > See Also</title>
<para >
<citerefentry > <refentrytitle > systemd</refentrytitle> <manvolnum > 1</manvolnum> </citerefentry> ,
<citerefentry > <refentrytitle > systemd.directives</refentrytitle> <manvolnum > 7</manvolnum> </citerefentry> ,
<citerefentry > <refentrytitle > systemd.exec</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry> ,
<citerefentry > <refentrytitle > systemd.service</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry> ,
<citerefentry project= 'man-pages' > <refentrytitle > environ</refentrytitle> <manvolnum > 7</manvolnum> </citerefentry> ,
<citerefentry project= 'man-pages' > <refentrytitle > capabilities</refentrytitle> <manvolnum > 7</manvolnum> </citerefentry>
</para>
</refsect1>
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</refentry>
