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SYSTEMD-SYSTEM.CONF(5)        systemd-system.conf       SYSTEMD-SYSTEM.CONF(5)

       systemd-system.conf, systemd-user.conf - System and session service
       manager configuration file



       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.

       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.

           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.

           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.

           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.

           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.

           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.

           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.


               DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"

           Sets three variables "VAR1", "VAR2", "VAR3".

       DefaultCPUAccounting=, DefaultBlockIOAccounting=,
           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=,
           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.

       systemd(1), systemd.directives(7), systemd.exec(5), systemd.service(5),
       environ(7), capabilities(7)

systemd 215                                             SYSTEMD-SYSTEM.CONF(5)

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