man/systemd-system.conf.xml

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   7   This file is part of systemd.
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   9   Copyright 2010 Lennart Poettering
  10
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  24
  25 <refentry id="systemd-system.conf">
  26         <refentryinfo>
  27                 <title>systemd-system.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-system.conf</refentrytitle>
  42                 <manvolnum>5</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>systemd-system.conf</refname>
  47                 <refname>systemd-user.conf</refname>
  48                 <refpurpose>System and session service manager configuration file</refpurpose>
  49         </refnamediv>
  50
  51         <refsynopsisdiv>
  52                 <para><filename>/etc/systemd/system.conf</filename></para>
  53                 <para><filename>/etc/systemd/user.conf</filename></para>
  54         </refsynopsisdiv>
  55
  56         <refsect1>
  57                 <title>Description</title>
  58
  59                 <para>When run as system instance systemd reads the
  60                 configuration file <filename>system.conf</filename>,
  61                 otherwise <filename>user.conf</filename>. These
  62                 configuration files contain a few settings controlling
  63                 basic manager operations.</para>
  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>DefaultTimeoutStartSec=</varname></term>
  98                                 <term><varname>DefaultTimeoutStopSec=</varname></term>
  99                                 <term><varname>DefaultRestartSec=</varname></term>
 100
 101                                 <listitem><para>Configures the default
 102                                 time-outs for starting and stopping of
 103                                 units, as well as the default time to
 104                                 sleep between automatic restarts of
 105                                 units, as configured per-unit in
 106                                 <varname>TimeoutStartSec=</varname>,
 107                                 <varname>TimeoutStopSec=</varname> and
 108                                 <varname>RestartSec=</varname> (for
 109                                 service units, see
 110                                 <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 111                                 for details on the per-unit
 112                                 settings). For non-service units,
 113                                 <varname>DefaultTimeoutStartSec=</varname>
 114                                 sets the default
 115                                 <varname>TimeoutSec=</varname> value.
 116                                 </para></listitem>
 117                         </varlistentry>
 118
 119                         <varlistentry>
 120                                 <term><varname>CPUAffinity=</varname></term>
 121
 122                                 <listitem><para>Configures the initial
 123                                 CPU affinity for the init
 124                                 process. Takes a space-separated list
 125                                 of CPU indexes.</para></listitem>
 126                         </varlistentry>
 127
 128                         <varlistentry>
 129                                 <term><varname>JoinControllers=cpu,cpuacct net_cls,netprio</varname></term>
 130
 131                                 <listitem><para>Configures controllers
 132                                 that shall be mounted in a single
 133                                 hierarchy. By default, systemd will
 134                                 mount all controllers which are
 135                                 enabled in the kernel in individual
 136                                 hierarchies, with the exception of
 137                                 those listed in this setting. Takes a
 138                                 space-separated list of comma-separated
 139                                 controller names, in order
 140                                 to allow multiple joined
 141                                 hierarchies. Defaults to
 142                                 'cpu,cpuacct'. Pass an empty string to
 143                                 ensure that systemd mounts all
 144                                 controllers in separate
 145                                 hierarchies.</para>
 146
 147                                 <para>Note that this option is only
 148                                 applied once, at very early boot. If
 149                                 you use an initial RAM disk (initrd)
 150                                 that uses systemd, it might hence be
 151                                 necessary to rebuild the initrd if
 152                                 this option is changed, and make sure
 153                                 the new configuration file is included
 154                                 in it. Otherwise, the initrd might
 155                                 mount the controller hierarchies in a
 156                                 different configuration than intended,
 157                                 and the main system cannot remount
 158                                 them anymore.</para></listitem>
 159                         </varlistentry>
 160
 161                         <varlistentry>
 162                                 <term><varname>RuntimeWatchdogSec=</varname></term>
 163                                 <term><varname>ShutdownWatchdogSec=</varname></term>
 164
 165                                 <listitem><para>Configure the hardware
 166                                 watchdog at runtime and at
 167                                 reboot. Takes a timeout value in
 168                                 seconds (or in other time units if
 169                                 suffixed with <literal>ms</literal>,
 170                                 <literal>min</literal>,
 171                                 <literal>h</literal>,
 172                                 <literal>d</literal>,
 173                                 <literal>w</literal>). If
 174                                 <varname>RuntimeWatchdogSec=</varname>
 175                                 is set to a non-zero value, the
 176                                 watchdog hardware
 177                                 (<filename>/dev/watchdog</filename>)
 178                                 will be programmed to automatically
 179                                 reboot the system if it is not
 180                                 contacted within the specified timeout
 181                                 interval. The system manager will
 182                                 ensure to contact it at least once in
 183                                 half the specified timeout
 184                                 interval. This feature requires a
 185                                 hardware watchdog device to be
 186                                 present, as it is commonly the case in
 187                                 embedded and server systems. Not all
 188                                 hardware watchdogs allow configuration
 189                                 of the reboot timeout, in which case
 190                                 the closest available timeout is
 191                                 picked. <varname>ShutdownWatchdogSec=</varname>
 192                                 may be used to configure the hardware
 193                                 watchdog when the system is asked to
 194                                 reboot. It works as a safety net to
 195                                 ensure that the reboot takes place
 196                                 even if a clean reboot attempt times
 197                                 out. By default
 198                                 <varname>RuntimeWatchdogSec=</varname>
 199                                 defaults to 0 (off), and
 200                                 <varname>ShutdownWatchdogSec=</varname>
 201                                 to 10min. These settings have no
 202                                 effect if a hardware watchdog is not
 203                                 available.</para></listitem>
 204                         </varlistentry>
 205
 206                         <varlistentry>
 207                                 <term><varname>CapabilityBoundingSet=</varname></term>
 208
 209                                 <listitem><para>Controls which
 210                                 capabilities to include in the
 211                                 capability bounding set for PID 1 and
 212                                 its children. See
 213                                 <citerefentry><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 214                                 for details. Takes a whitespace-separated
 215                                 list of capability names as read by
 216                                 <citerefentry><refentrytitle>cap_from_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
 217                                 Capabilities listed will be included
 218                                 in the bounding set, all others are
 219                                 removed. If the list of capabilities
 220                                 is prefixed with ~, all but the listed
 221                                 capabilities will be included, the
 222                                 effect of the assignment
 223                                 inverted. Note that this option also
 224                                 affects the respective capabilities in
 225                                 the effective, permitted and
 226                                 inheritable capability sets. The
 227                                 capability bounding set may also be
 228                                 individually configured for units
 229                                 using the
 230                                 <varname>CapabilityBoundingSet=</varname>
 231                                 directive for units, but note that
 232                                 capabilities dropped for PID 1 cannot
 233                                 be regained in individual units, they
 234                                 are lost for good.</para></listitem>
 235                         </varlistentry>
 236
 237                         <varlistentry>
 238                                 <term><varname>TimerSlackNSec=</varname></term>
 239
 240                                 <listitem><para>Sets the timer slack
 241                                 in nanoseconds for PID 1 which is then
 242                                 inherited to all executed processes,
 243                                 unless overridden individually, for
 244                                 example with the
 245                                 <varname>TimerSlackNSec=</varname>
 246                                 setting in service units (for details
 247                                 see
 248                                 <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). The
 249                                 timer slack controls the accuracy of
 250                                 wake-ups triggered by timers. See
 251                                 <citerefentry><refentrytitle>prctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 252                                 for more information. Note that in
 253                                 contrast to most other time span
 254                                 definitions this parameter takes an
 255                                 integer value in nano-seconds if no
 256                                 unit is specified. The usual time
 257                                 units are understood
 258                                 too.</para></listitem>
 259                         </varlistentry>
 260
 261                         <varlistentry>
 262                                 <term><varname>DefaultEnvironment=</varname></term>
 263
 264                                 <listitem><para>Sets manager
 265                                 environment variables passed to all
 266                                 executed processes. Takes a
 267                                 space-separated list of variable
 268                                 assignments. See
 269                                 <citerefentry><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 270                                 for details about environment
 271                                 variables.</para>
 272
 273                                 <para>Example:
 274
 275                                 <programlisting>DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"</programlisting>
 276
 277                                 Sets three variables
 278                                 <literal>VAR1</literal>,
 279                                 <literal>VAR2</literal>,
 280                                 <literal>VAR3</literal>.</para></listitem>
 281                         </varlistentry>
 282
 283                         <varlistentry>
 284                                 <term><varname>DefaultLimitCPU=</varname></term>
 285                                 <term><varname>DefaultLimitFSIZE=</varname></term>
 286                                 <term><varname>DefaultLimitDATA=</varname></term>
 287                                 <term><varname>DefaultLimitSTACK=</varname></term>
 288                                 <term><varname>DefaultLimitCORE=</varname></term>
 289                                 <term><varname>DefaultLimitRSS=</varname></term>
 290                                 <term><varname>DefaultLimitNOFILE=</varname></term>
 291                                 <term><varname>DefaultLimitAS=</varname></term>
 292                                 <term><varname>DefaultLimitNPROC=</varname></term>
 293                                 <term><varname>DefaultLimitMEMLOCK=</varname></term>
 294                                 <term><varname>DefaultLimitLOCKS=</varname></term>
 295                                 <term><varname>DefaultLimitSIGPENDING=</varname></term>
 296                                 <term><varname>DefaultLimitMSGQUEUE=</varname></term>
 297                                 <term><varname>DefaultLimitNICE=</varname></term>
 298                                 <term><varname>DefaultLimitRTPRIO=</varname></term>
 299                                 <term><varname>DefaultLimitRTTIME=</varname></term>
 300
 301                                 <listitem><para>These settings control
 302                                 various default resource limits for
 303                                 units. See
 304                                 <citerefentry><refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 305                                 for details. Use the string
 306                                 <varname>infinity</varname> to
 307                                 configure no limit on a specific
 308                                 resource. These settings may be
 309                                 overridden in individual units
 310                                 using the corresponding LimitXXX=
 311                                 directives. Note that these resource
 312                                 limits are only defaults for units,
 313                                 they are not applied to PID 1
 314                                 itself.</para></listitem>
 315                         </varlistentry>
 316                 </variablelist>
 317         </refsect1>
 318
 319         <refsect1>
 320                   <title>See Also</title>
 321                   <para>
 322                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 323                           <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 324                           <citerefentry><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 325                   </para>
 326         </refsect1>
 327
 328 </refentry>