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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>systemd-system.conf</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style>
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</style><a href="index.html">Index </a>·
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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 215</span><hr><div class="refentry"><a name="systemd-system.conf"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-system.conf, systemd-user.conf — System and session service manager configuration file</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">/etc/systemd/system.conf</code></p><p><code class="filename">/etc/systemd/user.conf</code></p></div><div class="refsect1"><a name="idm214192121936"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p>When run as system instance systemd reads the
configuration file <code class="filename">system.conf</code>,
otherwise <code class="filename">user.conf</code>. These
configuration files contain a few settings controlling
basic manager operations.</p></div><div class="refsect1"><a name="idm214192119184"></a><h2 id="Options">Options<a class="headerlink" title="Permalink to this headline" href="#Options">¶</a></h2><p>All options are configured in the
"<code class="literal">[Manager]</code>" section:</p><div class="variablelist"><dl class="variablelist"><dt id="LogLevel="><span class="term"><code class="varname">LogLevel=</code>, </span><span class="term"><code class="varname">LogTarget=</code>, </span><span class="term"><code class="varname">LogColor=</code>, </span><span class="term"><code class="varname">LogLocation=</code>, </span><span class="term"><code class="varname">DumpCore=yes</code>, </span><span class="term"><code class="varname">CrashShell=no</code>, </span><span class="term"><code class="varname">ShowStatus=yes</code>, </span><span class="term"><code class="varname">CrashChVT=1</code>, </span><span class="term"><code class="varname">DefaultStandardOutput=journal</code>, </span><span class="term"><code class="varname">DefaultStandardError=inherit</code></span><a class="headerlink" title="Permalink to this term" href="#LogLevel=">¶</a></dt><dd><p>Configures various
parameters of basic manager
operation. These options may be
overridden by the respective command
line arguments. See
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>
for details about these command line
arguments.</p></dd><dt id="CPUAffinity="><span class="term"><code class="varname">CPUAffinity=</code></span><a class="headerlink" title="Permalink to this term" href="#CPUAffinity=">¶</a></dt><dd><p>Configures the initial
CPU affinity for the init
process. Takes a space-separated list
of CPU indices.</p></dd><dt id="JoinControllers=cpu,cpuacct net_cls,netprio"><span class="term"><code class="varname">JoinControllers=cpu,cpuacct net_cls,netprio</code></span><a class="headerlink" title="Permalink to this term" href="#JoinControllers=cpu,cpuacct%20net_cls,netprio">¶</a></dt><dd><p>Configures controllers
that shall be mounted in a single
hierarchy. By default, systemd will
mount all controllers which are
enabled in the kernel in individual
hierarchies, with the exception of
those listed in this setting. Takes a
space-separated list of comma-separated
controller names, in order
to allow multiple joined
hierarchies. Defaults to
'cpu,cpuacct'. Pass an empty string to
ensure that systemd mounts all
controllers in separate
hierarchies.</p><p>Note that this option is only
applied once, at very early boot. If
you use an initial RAM disk (initrd)
that uses systemd, it might hence be
necessary to rebuild the initrd if
this option is changed, and make sure
the new configuration file is included
in it. Otherwise, the initrd might
mount the controller hierarchies in a
different configuration than intended,
and the main system cannot remount
them anymore.</p></dd><dt id="RuntimeWatchdogSec="><span class="term"><code class="varname">RuntimeWatchdogSec=</code>, </span><span class="term"><code class="varname">ShutdownWatchdogSec=</code></span><a class="headerlink" title="Permalink to this term" href="#RuntimeWatchdogSec=">¶</a></dt><dd><p>Configure the hardware
watchdog at runtime and at
reboot. Takes a timeout value in
seconds (or in other time units if
suffixed with "<code class="literal">ms</code>",
"<code class="literal">min</code>",
"<code class="literal">h</code>",
"<code class="literal">d</code>",
"<code class="literal">w</code>"). If
<code class="varname">RuntimeWatchdogSec=</code>
is set to a non-zero value, the
watchdog hardware
(<code class="filename">/dev/watchdog</code>)
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 the reboot timeout, in which case
the closest available timeout is
picked. <code class="varname">ShutdownWatchdogSec=</code>
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. By default
<code class="varname">RuntimeWatchdogSec=</code>
defaults to 0 (off), and
<code class="varname">ShutdownWatchdogSec=</code>
to 10min. These settings have no
effect if a hardware watchdog is not
available.</p></dd><dt id="CapabilityBoundingSet="><span class="term"><code class="varname">CapabilityBoundingSet=</code></span><a class="headerlink" title="Permalink to this term" href="#CapabilityBoundingSet=">¶</a></dt><dd><p>Controls which
capabilities to include in the
capability bounding set for PID 1 and
its children. See
<a href="capabilities.html"><span class="citerefentry"><span class="refentrytitle">capabilities</span>(7)</span></a>
for details. Takes a whitespace-separated
list of capability names as read by
<a href="cap_from_name.html"><span class="citerefentry"><span class="refentrytitle">cap_from_name</span>(3)</span></a>.
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
<code class="varname">CapabilityBoundingSet=</code>
directive for units, but note that
capabilities dropped for PID 1 cannot
be regained in individual units, they
are lost for good.</p></dd><dt id="SystemCallArchitectures="><span class="term"><code class="varname">SystemCallArchitectures=</code></span><a class="headerlink" title="Permalink to this term" href="#SystemCallArchitectures=">¶</a></dt><dd><p>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
<code class="varname">SystemCallArchitectures=</code>
setting of unit files, see
<a href="systemd.exec.html"><span class="citerefentry"><span class="refentrytitle">systemd.exec</span>(5)</span></a>
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
"<code class="literal">x86</code>",
"<code class="literal">x86-64</code>",
"<code class="literal">x32</code>",
"<code class="literal">arm</code>" and the special
identifier
"<code class="literal">native</code>". 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
"<code class="literal">native</code>" 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.</p></dd><dt id="TimerSlackNSec="><span class="term"><code class="varname">TimerSlackNSec=</code></span><a class="headerlink" title="Permalink to this term" href="#TimerSlackNSec=">¶</a></dt><dd><p>Sets the timer slack
in nanoseconds for PID 1, which is
inherited by all executed processes,
unless overridden individually, for
example with the
<code class="varname">TimerSlackNSec=</code>
setting in service units (for details
see
<a href="systemd.exec.html"><span class="citerefentry"><span class="refentrytitle">systemd.exec</span>(5)</span></a>). The
timer slack controls the accuracy of
wake-ups triggered by system
timers. See
<a href="prctl.html"><span class="citerefentry"><span class="refentrytitle">prctl</span>(2)</span></a>
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.</p></dd><dt id="DefaultTimerAccuracySec="><span class="term"><code class="varname">DefaultTimerAccuracySec=</code></span><a class="headerlink" title="Permalink to this term" href="#DefaultTimerAccuracySec=">¶</a></dt><dd><p>Sets the default
accuracy of timer units. This controls
the global default for the
<code class="varname">AccuracySec=</code>
setting of timer units, see
<a href="systemd.timer.html"><span class="citerefentry"><span class="refentrytitle">systemd.timer</span>(5)</span></a>
for
details. <code class="varname">AccuracySec=</code>
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
<code class="varname">TimerSlackNSec=</code>
above.</p></dd><dt id="DefaultTimeoutStartSec="><span class="term"><code class="varname">DefaultTimeoutStartSec=</code>, </span><span class="term"><code class="varname">DefaultTimeoutStopSec=</code>, </span><span class="term"><code class="varname">DefaultRestartSec=</code></span><a class="headerlink" title="Permalink to this term" href="#DefaultTimeoutStartSec=">¶</a></dt><dd><p>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
<code class="varname">TimeoutStartSec=</code>,
<code class="varname">TimeoutStopSec=</code> and
<code class="varname">RestartSec=</code> (for
services, see
<a href="systemd.service.html"><span class="citerefentry"><span class="refentrytitle">systemd.service</span>(5)</span></a>
for details on the per-unit
settings). For non-service units,
<code class="varname">DefaultTimeoutStartSec=</code>
sets the default
<code class="varname">TimeoutSec=</code> value.
</p></dd><dt id="DefaultStartLimitInterval="><span class="term"><code class="varname">DefaultStartLimitInterval=</code>, </span><span class="term"><code class="varname">DefaultStartLimitBurst=</code></span><a class="headerlink" title="Permalink to this term" href="#DefaultStartLimitInterval=">¶</a></dt><dd><p>Configure the default
unit start rate limiting, as
configured per-service by
<code class="varname">StartLimitInterval=</code>
and
<code class="varname">StartLimitBurst=</code>. See
<a href="systemd.service.html"><span class="citerefentry"><span class="refentrytitle">systemd.service</span>(5)</span></a>
for details on the per-service
settings.</p></dd><dt id="DefaultEnvironment="><span class="term"><code class="varname">DefaultEnvironment=</code></span><a class="headerlink" title="Permalink to this term" href="#DefaultEnvironment=">¶</a></dt><dd><p>Sets manager
environment variables passed to all
executed processes. Takes a
space-separated list of variable
assignments. See
<a href="environ.html"><span class="citerefentry"><span class="refentrytitle">environ</span>(7)</span></a>
for details about environment
variables.</p><p>Example:
</p><pre class="programlisting">DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"</pre><p>
Sets three variables
"<code class="literal">VAR1</code>",
"<code class="literal">VAR2</code>",
"<code class="literal">VAR3</code>".</p></dd><dt id="DefaultCPUAccounting="><span class="term"><code class="varname">DefaultCPUAccounting=</code>, </span><span class="term"><code class="varname">DefaultBlockIOAccounting=</code>, </span><span class="term"><code class="varname">DefaultMemoryAccounting=</code></span><a class="headerlink" title="Permalink to this term" href="#DefaultCPUAccounting=">¶</a></dt><dd><p>Configure the default
resource accounting settings, as
configured per-unit by
<code class="varname">CPUAccounting=</code>,
<code class="varname">BlockIOAccounting=</code>
and
<code class="varname">MemoryAccounting=</code>. See
<a href="systemd.resource-control.html"><span class="citerefentry"><span class="refentrytitle">systemd.resource-control</span>(5)</span></a>
for details on the per-unit
settings.</p></dd><dt id="DefaultLimitCPU="><span class="term"><code class="varname">DefaultLimitCPU=</code>, </span><span class="term"><code class="varname">DefaultLimitFSIZE=</code>, </span><span class="term"><code class="varname">DefaultLimitDATA=</code>, </span><span class="term"><code class="varname">DefaultLimitSTACK=</code>, </span><span class="term"><code class="varname">DefaultLimitCORE=</code>, </span><span class="term"><code class="varname">DefaultLimitRSS=</code>, </span><span class="term"><code class="varname">DefaultLimitNOFILE=</code>, </span><span class="term"><code class="varname">DefaultLimitAS=</code>, </span><span class="term"><code class="varname">DefaultLimitNPROC=</code>, </span><span class="term"><code class="varname">DefaultLimitMEMLOCK=</code>, </span><span class="term"><code class="varname">DefaultLimitLOCKS=</code>, </span><span class="term"><code class="varname">DefaultLimitSIGPENDING=</code>, </span><span class="term"><code class="varname">DefaultLimitMSGQUEUE=</code>, </span><span class="term"><code class="varname">DefaultLimitNICE=</code>, </span><span class="term"><code class="varname">DefaultLimitRTPRIO=</code>, </span><span class="term"><code class="varname">DefaultLimitRTTIME=</code></span><a class="headerlink" title="Permalink to this term" href="#DefaultLimitCPU=">¶</a></dt><dd><p>These settings control
various default resource limits for
units. See
<a href="setrlimit.html"><span class="citerefentry"><span class="refentrytitle">setrlimit</span>(2)</span></a>
for details. Use the string
<code class="varname">infinity</code> to
configure no limit on a specific
resource. 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
itself.</p></dd></dl></div></div><div class="refsect1"><a name="idm214191021312"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
<a href="systemd.directives.html"><span class="citerefentry"><span class="refentrytitle">systemd.directives</span>(7)</span></a>,
<a href="systemd.exec.html"><span class="citerefentry"><span class="refentrytitle">systemd.exec</span>(5)</span></a>,
<a href="systemd.service.html"><span class="citerefentry"><span class="refentrytitle">systemd.service</span>(5)</span></a>,
<a href="environ.html"><span class="citerefentry"><span class="refentrytitle">environ</span>(7)</span></a>,
<a href="capabilities.html"><span class="citerefentry"><span class="refentrytitle">capabilities</span>(7)</span></a>
</p></div></div></body></html>
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