SYSTEMD-SYSTEM.CONF(5)systemd-system.confSYSTEMD-SYSTEM.CONF(5)NAME
systemd-system.conf, systemd-user.conf - System and session service
manager configuration file
SYNOPSIS
/etc/systemd/system.conf
/etc/systemd/user.conf
DESCRIPTION
When run as system instance systemd reads the configuration file
system.conf, otherwise user.conf. These configuration files contain a
few settings controlling basic manager operations.
OPTIONS
All options are configured in the "[Manager]" section:
LogLevel=, LogTarget=, LogColor=, LogLocation=, DumpCore=yes,
CrashShell=no, ShowStatus=yes, CrashChVT=1,
DefaultStandardOutput=journal, DefaultStandardError=inherit
Configures various parameters of basic manager operation. These
options may be overridden by the respective command line arguments.
See systemd(1) for details about these command line arguments.
CPUAffinity=
Configures the initial CPU affinity for the init process. Takes a
space-separated list of CPU indices.
JoinControllers=cpu,cpuacct net_cls,netprio
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.
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.
RuntimeWatchdogSec=, ShutdownWatchdogSec=
Configure the hardware watchdog at runtime and at reboot. Takes a
timeout value in seconds (or in other time units if suffixed with
"ms", "min", "h", "d", "w"). If RuntimeWatchdogSec= is set to a
non-zero value, the watchdog hardware (/dev/watchdog) 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. ShutdownWatchdogSec= 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 RuntimeWatchdogSec= defaults to 0
(off), and ShutdownWatchdogSec= to 10min. These settings have no
effect if a hardware watchdog is not available.
CapabilityBoundingSet=
Controls which capabilities to include in the capability bounding
set for PID 1 and its children. See capabilities(7) for details.
Takes a whitespace-separated list of capability names as read by
cap_from_name(3). 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
CapabilityBoundingSet= directive for units, but note that
capabilities dropped for PID 1 cannot be regained in individual
units, they are lost for good.
SystemCallArchitectures=
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
SystemCallArchitectures= setting of unit files, see systemd.exec(5)
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 "x86", "x86-64", "x32", "arm"
and the special identifier "native". 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 "native" 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.
TimerSlackNSec=
Sets the timer slack in nanoseconds for PID 1, which is inherited
by all executed processes, unless overridden individually, for
example with the TimerSlackNSec= setting in service units (for
details see systemd.exec(5)). The timer slack controls the accuracy
of wake-ups triggered by system timers. See prctl(2) 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.
DefaultTimerAccuracySec=
Sets the default accuracy of timer units. This controls the global
default for the AccuracySec= setting of timer units, see
systemd.timer(5) for details. AccuracySec= 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 TimerSlackNSec= above.
DefaultTimeoutStartSec=, DefaultTimeoutStopSec=, DefaultRestartSec=
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 TimeoutStartSec=, TimeoutStopSec=
and RestartSec= (for services, see systemd.service(5) for details
on the per-unit settings). For non-service units,
DefaultTimeoutStartSec= sets the default TimeoutSec= value.
DefaultStartLimitInterval=, DefaultStartLimitBurst=
Configure the default unit start rate limiting, as configured
per-service by StartLimitInterval= and StartLimitBurst=. See
systemd.service(5) for details on the per-service settings.
DefaultEnvironment=
Sets manager environment variables passed to all executed
processes. Takes a space-separated list of variable assignments.
See environ(7) for details about environment variables.
Example:
DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"
Sets three variables "VAR1", "VAR2", "VAR3".
DefaultCPUAccounting=, DefaultBlockIOAccounting=,
DefaultMemoryAccounting=
Configure the default resource accounting settings, as configured
per-unit by CPUAccounting=, BlockIOAccounting= and
MemoryAccounting=. See systemd.resource-control(5) for details on
the per-unit settings.
DefaultLimitCPU=, DefaultLimitFSIZE=, DefaultLimitDATA=,
DefaultLimitSTACK=, DefaultLimitCORE=, DefaultLimitRSS=,
DefaultLimitNOFILE=, DefaultLimitAS=, DefaultLimitNPROC=,
DefaultLimitMEMLOCK=, DefaultLimitLOCKS=, DefaultLimitSIGPENDING=,
DefaultLimitMSGQUEUE=, DefaultLimitNICE=, DefaultLimitRTPRIO=,
DefaultLimitRTTIME=
These settings control various default resource limits for units.
See setrlimit(2) for details. Use the string infinity 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.
SEE ALSOsystemd(1), systemd.directives(7), systemd.exec(5), systemd.service(5),
environ(7), capabilities(7)systemd 212SYSTEMD-SYSTEM.CONF(5)
