man/systemd.conf.xml

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   7   This file is part of systemd.
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   9   Copyright 2010 Lennart Poettering
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU Lesser General Public License as published by
  13   the Free Software Foundation; either version 2.1 of the License, or
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  19   Lesser General Public License for more details.
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  24
  25 <refentry id="systemd.conf">
  26         <refentryinfo>
  27                 <title>systemd.conf</title>
  28                 <productname>systemd</productname>
  29
  30                 <authorgroup>
  31                         <author>
  32                                 <contrib>Developer</contrib>
  33                                 <firstname>Lennart</firstname>
  34                                 <surname>Poettering</surname>
  35                                 <email>lennart@poettering.net</email>
  36                         </author>
  37                 </authorgroup>
  38         </refentryinfo>
  39
  40         <refmeta>
  41                 <refentrytitle>systemd.conf</refentrytitle>
  42                 <manvolnum>5</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>systemd.conf</refname>
  47                 <refpurpose>System and service manager configuration file</refpurpose>
  48         </refnamediv>
  49
  50         <refsynopsisdiv>
  51                 <para><filename>/etc/systemd/system.conf</filename></para>
  52                 <para><filename>/etc/systemd/user.conf</filename></para>
  53         </refsynopsisdiv>
  54
  55         <refsect1>
  56                 <title>Description</title>
  57
  58                 <para>When run as system instance systemd reads the
  59                 configuration file <filename>system.conf</filename>,
  60                 otherwise <filename>user.conf</filename>. These
  61                 configuration files contain a few settings controlling
  62                 basic manager operations.</para>
  63
  64         </refsect1>
  65
  66         <refsect1>
  67                 <title>Options</title>
  68
  69                 <para>All options are configured in the
  70                 <literal>[Manager]</literal> section:</para>
  71
  72                 <variablelist class='systemd-directives'>
  73
  74                         <varlistentry>
  75                                 <term><varname>LogLevel=</varname></term>
  76                                 <term><varname>LogTarget=</varname></term>
  77                                 <term><varname>LogColor=</varname></term>
  78                                 <term><varname>LogLocation=</varname></term>
  79                                 <term><varname>DumpCore=yes</varname></term>
  80                                 <term><varname>CrashShell=no</varname></term>
  81                                 <term><varname>ShowStatus=yes</varname></term>
  82                                 <term><varname>CrashChVT=1</varname></term>
  83                                 <term><varname>DefaultStandardOutput=journal</varname></term>
  84                                 <term><varname>DefaultStandardError=inherit</varname></term>
  85
  86                                 <listitem><para>Configures various
  87                                 parameters of basic manager
  88                                 operation. These options may be
  89                                 overridden by the respective command
  90                                 line arguments. See
  91                                 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  92                                 for details about these command line
  93                                 arguments.</para></listitem>
  94                         </varlistentry>
  95
  96                         <varlistentry>
  97                                 <term><varname>CPUAffinity=</varname></term>
  98
  99                                 <listitem><para>Configures the initial
 100                                 CPU affinity for the init
 101                                 process. Takes a space-separated list
 102                                 of CPU indexes.</para></listitem>
 103                         </varlistentry>
 104
 105                         <varlistentry>
 106                                 <term><varname>DefaultControllers=cpu</varname></term>
 107
 108                                 <listitem><para>Configures in which
 109                                 cgroup controller hierarchies to
 110                                 create per-service cgroups
 111                                 automatically, in addition to the
 112                                 name=systemd named hierarchy. Defaults
 113                                 to 'cpu'. Takes a space separated list
 114                                 of controller names. Pass an empty
 115                                 string to ensure that systemd does not
 116                                 touch any hierarchies but its
 117                                 own.</para></listitem>
 118                         </varlistentry>
 119
 120                         <varlistentry>
 121                                 <term><varname>JoinControllers=cpu,cpuacct,cpuset net_cls,netprio</varname></term>
 122
 123                                 <listitem><para>Configures controllers
 124                                 that shall be mounted in a single
 125                                 hierarchy. By default systemd will
 126                                 mount all controllers which are
 127                                 enabled in the kernel in individual
 128                                 hierarchies, with the exception of
 129                                 those listed in this setting. Takes a
 130                                 space separated list of comma
 131                                 separated controller names, in order
 132                                 to allow multiple joined
 133                                 hierarchies. Defaults to
 134                                 'cpu,cpuacct'. Pass an empty string to
 135                                 ensure that systemd mounts all
 136                                 controllers in separate
 137                                 hierarchies.</para>
 138
 139                                 <para>Note that this option is only
 140                                 applied once, at very early boot. If
 141                                 you use an initial RAM disk (initrd)
 142                                 that uses systemd it might hence be
 143                                 necessary to rebuild the initrd if
 144                                 this option is changed, and make sure
 145                                 the new configuration file is included
 146                                 in it. Otherwise the initrd might
 147                                 mount the controllers in different
 148                                 configuration than intended, and the
 149                                 main system cannot remount them
 150                                 anymore.</para></listitem>
 151                         </varlistentry>
 152
 153                         <varlistentry>
 154                                 <term><varname>RuntimeWatchdogSec=</varname></term>
 155                                 <term><varname>ShutdownWatchdogSec=</varname></term>
 156
 157                                 <listitem><para>Configure the hardware
 158                                 watchdog at runtime and at
 159                                 reboot. Takes a timeout value in
 160                                 seconds (or in other time units if
 161                                 suffixed with <literal>ms</literal>,
 162                                 <literal>min</literal>,
 163                                 <literal>h</literal>,
 164                                 <literal>d</literal>,
 165                                 <literal>w</literal>). If
 166                                 <varname>RuntimeWatchdogSec=</varname>
 167                                 is set to a non-zero value the
 168                                 watchdog hardware
 169                                 (<filename>/dev/watchdog</filename>)
 170                                 will be programmed to automatically
 171                                 reboot the system if it is not
 172                                 contacted within the specified timeout
 173                                 interval. The system manager will
 174                                 ensure to contact it at least once in
 175                                 half the specified timeout
 176                                 interval. This feature requires a
 177                                 hardware watchdog device to be
 178                                 present, as it is commonly the case in
 179                                 embedded and server systems. Not all
 180                                 hardware watchdogs allow configuration
 181                                 of the reboot timeout, in which case
 182                                 the closest available timeout is
 183                                 picked. <varname>ShutdownWatchdogSec=</varname>
 184                                 may be used to configure the hardware
 185                                 watchdog when the system is asked to
 186                                 reboot. It works as a safety net to
 187                                 ensure that the reboot takes place
 188                                 even if a clean reboot attempt times
 189                                 out. By default
 190                                 <varname>RuntimeWatchdogSec=</varname>
 191                                 defaults to 0 (off), and
 192                                 <varname>ShutdownWatchdogSec=</varname>
 193                                 to 10min. These settings have no
 194                                 effect if a hardware watchdog is not
 195                                 available.</para></listitem>
 196                         </varlistentry>
 197
 198                         <varlistentry>
 199                                 <term><varname>CapabilityBoundingSet=</varname></term>
 200
 201                                 <listitem><para>Controls which
 202                                 capabilities to include in the
 203                                 capability bounding set for PID 1 and
 204                                 its children. See
 205                                 <citerefentry><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 206                                 for details. Takes a whitespace
 207                                 separated list of capability names as
 208                                 read by
 209                                 <citerefentry><refentrytitle>cap_from_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
 210                                 Capabilities listed will be included
 211                                 in the bounding set, all others are
 212                                 removed. If the list of capabilities
 213                                 is prefixed with ~ all but the listed
 214                                 capabilities will be included, the
 215                                 effect of the assignment
 216                                 inverted. Note that this option also
 217                                 affects the respective capabilities in
 218                                 the effective, permitted and
 219                                 inheritable capability sets. The
 220                                 capability bounding set may also be
 221                                 individually configured for units
 222                                 using the
 223                                 <varname>CapabilityBoundingSet=</varname>
 224                                 directive for units, but note that
 225                                 capabilities dropped for PID 1 cannot
 226                                 be regained in individual units, they
 227                                 are lost for good.</para></listitem>
 228                         </varlistentry>
 229
 230                         <varlistentry>
 231                                 <term><varname>TimerSlackNSec=</varname></term>
 232
 233                                 <listitem><para>Sets the timer slack
 234                                 in nanoseconds for PID 1 which is then
 235                                 inherited to all executed processes,
 236                                 unless overridden individually, for
 237                                 example with the
 238                                 <varname>TimerSlackNSec=</varname>
 239                                 setting in service units (for details
 240                                 see
 241                                 <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). The
 242                                 timer slack controls the accuracy of
 243                                 wake-ups triggered by timers. See
 244                                 <citerefentry><refentrytitle>prctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 245                                 for more information. Note that in
 246                                 contrast to most other time span
 247                                 definitions this parameter takes an
 248                                 integer value in nano-seconds if no
 249                                 unit is specified. The usual time
 250                                 units are understood
 251                                 too.</para></listitem>
 252                         </varlistentry>
 253
 254                         <varlistentry>
 255                                 <term><varname>DefaultLimitCPU=</varname></term>
 256                                 <term><varname>DefaultLimitFSIZE=</varname></term>
 257                                 <term><varname>DefaultLimitDATA=</varname></term>
 258                                 <term><varname>DefaultLimitSTACK=</varname></term>
 259                                 <term><varname>DefaultLimitCORE=</varname></term>
 260                                 <term><varname>DefaultLimitRSS=</varname></term>
 261                                 <term><varname>DefaultLimitNOFILE=</varname></term>
 262                                 <term><varname>DefaultLimitAS=</varname></term>
 263                                 <term><varname>DefaultLimitNPROC=</varname></term>
 264                                 <term><varname>DefaultLimitMEMLOCK=</varname></term>
 265                                 <term><varname>DefaultLimitLOCKS=</varname></term>
 266                                 <term><varname>DefaultLimitSIGPENDING=</varname></term>
 267                                 <term><varname>DefaultLimitMSGQUEUE=</varname></term>
 268                                 <term><varname>DefaultLimitNICE=</varname></term>
 269                                 <term><varname>DefaultLimitRTPRIO=</varname></term>
 270                                 <term><varname>DefaultLimitRTTIME=</varname></term>
 271
 272                                 <listitem><para>These settings control
 273                                 various default resource limits for
 274                                 units. See
 275                                 <citerefentry><refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 276                                 for details. Use the string
 277                                 <varname>infinity</varname> to
 278                                 configure no limit on a specific
 279                                 resource. These settings may be
 280                                 overridden in individual units
 281                                 using the corresponding LimitXXX=
 282                                 directives. Note that these resource
 283                                 limits are only defaults for units,
 284                                 they are not applied to PID 1
 285                                 itself.</para></listitem>
 286                         </varlistentry>
 287                 </variablelist>
 288         </refsect1>
 289
 290         <refsect1>
 291                   <title>See Also</title>
 292                   <para>
 293                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 294                           <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 295                   </para>
 296         </refsect1>
 297
 298 </refentry>