man/systemd-system.conf.xml

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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>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 indices.</para></listitem>
 103                         </varlistentry>
 104
 105                         <varlistentry>
 106                                 <term><varname>JoinControllers=cpu,cpuacct net_cls,netprio</varname></term>
 107
 108                                 <listitem><para>Configures controllers
 109                                 that shall be mounted in a single
 110                                 hierarchy. By default, systemd will
 111                                 mount all controllers which are
 112                                 enabled in the kernel in individual
 113                                 hierarchies, with the exception of
 114                                 those listed in this setting. Takes a
 115                                 space-separated list of comma-separated
 116                                 controller names, in order
 117                                 to allow multiple joined
 118                                 hierarchies. Defaults to
 119                                 'cpu,cpuacct'. Pass an empty string to
 120                                 ensure that systemd mounts all
 121                                 controllers in separate
 122                                 hierarchies.</para>
 123
 124                                 <para>Note that this option is only
 125                                 applied once, at very early boot. If
 126                                 you use an initial RAM disk (initrd)
 127                                 that uses systemd, it might hence be
 128                                 necessary to rebuild the initrd if
 129                                 this option is changed, and make sure
 130                                 the new configuration file is included
 131                                 in it. Otherwise, the initrd might
 132                                 mount the controller hierarchies in a
 133                                 different configuration than intended,
 134                                 and the main system cannot remount
 135                                 them anymore.</para></listitem>
 136                         </varlistentry>
 137
 138                         <varlistentry>
 139                                 <term><varname>RuntimeWatchdogSec=</varname></term>
 140                                 <term><varname>ShutdownWatchdogSec=</varname></term>
 141
 142                                 <listitem><para>Configure the hardware
 143                                 watchdog at runtime and at
 144                                 reboot. Takes a timeout value in
 145                                 seconds (or in other time units if
 146                                 suffixed with <literal>ms</literal>,
 147                                 <literal>min</literal>,
 148                                 <literal>h</literal>,
 149                                 <literal>d</literal>,
 150                                 <literal>w</literal>). If
 151                                 <varname>RuntimeWatchdogSec=</varname>
 152                                 is set to a non-zero value, the
 153                                 watchdog hardware
 154                                 (<filename>/dev/watchdog</filename>)
 155                                 will be programmed to automatically
 156                                 reboot the system if it is not
 157                                 contacted within the specified timeout
 158                                 interval. The system manager will
 159                                 ensure to contact it at least once in
 160                                 half the specified timeout
 161                                 interval. This feature requires a
 162                                 hardware watchdog device to be
 163                                 present, as it is commonly the case in
 164                                 embedded and server systems. Not all
 165                                 hardware watchdogs allow configuration
 166                                 of the reboot timeout, in which case
 167                                 the closest available timeout is
 168                                 picked. <varname>ShutdownWatchdogSec=</varname>
 169                                 may be used to configure the hardware
 170                                 watchdog when the system is asked to
 171                                 reboot. It works as a safety net to
 172                                 ensure that the reboot takes place
 173                                 even if a clean reboot attempt times
 174                                 out. By default
 175                                 <varname>RuntimeWatchdogSec=</varname>
 176                                 defaults to 0 (off), and
 177                                 <varname>ShutdownWatchdogSec=</varname>
 178                                 to 10min. These settings have no
 179                                 effect if a hardware watchdog is not
 180                                 available.</para></listitem>
 181                         </varlistentry>
 182
 183                         <varlistentry>
 184                                 <term><varname>CapabilityBoundingSet=</varname></term>
 185
 186                                 <listitem><para>Controls which
 187                                 capabilities to include in the
 188                                 capability bounding set for PID 1 and
 189                                 its children. See
 190                                 <citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 191                                 for details. Takes a whitespace-separated
 192                                 list of capability names as read by
 193                                 <citerefentry><refentrytitle>cap_from_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
 194                                 Capabilities listed will be included
 195                                 in the bounding set, all others are
 196                                 removed. If the list of capabilities
 197                                 is prefixed with ~, all but the listed
 198                                 capabilities will be included, the
 199                                 effect of the assignment
 200                                 inverted. Note that this option also
 201                                 affects the respective capabilities in
 202                                 the effective, permitted and
 203                                 inheritable capability sets. The
 204                                 capability bounding set may also be
 205                                 individually configured for units
 206                                 using the
 207                                 <varname>CapabilityBoundingSet=</varname>
 208                                 directive for units, but note that
 209                                 capabilities dropped for PID 1 cannot
 210                                 be regained in individual units, they
 211                                 are lost for good.</para></listitem>
 212                         </varlistentry>
 213
 214                         <varlistentry>
 215                                 <term><varname>SystemCallArchitectures=</varname></term>
 216
 217                                 <listitem><para>Takes a
 218                                 space-separated list of architecture
 219                                 identifiers. Selects from which
 220                                 architectures system calls may be
 221                                 invoked on this system. This may be
 222                                 used as an effective way to disable
 223                                 invocation of non-native binaries
 224                                 system-wide, for example to prohibit
 225                                 execution of 32-bit x86 binaries on
 226                                 64-bit x86-64 systems. This option
 227                                 operates system-wide, and acts
 228                                 similar to the
 229                                 <varname>SystemCallArchitectures=</varname>
 230                                 setting of unit files, see
 231                                 <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 232                                 for details. This setting defaults to
 233                                 the empty list, in which case no
 234                                 filtering of system calls based on
 235                                 architecture is applied. Known
 236                                 architecture identifiers are
 237                                 <literal>x86</literal>,
 238                                 <literal>x86-64</literal>,
 239                                 <literal>x32</literal>,
 240                                 <literal>arm</literal> and the special
 241                                 identifier
 242                                 <literal>native</literal>. The latter
 243                                 implicitly maps to the native
 244                                 architecture of the system (or more
 245                                 specifically, the architecture the
 246                                 system manager was compiled for). Set
 247                                 this setting to
 248                                 <literal>native</literal> to prohibit
 249                                 execution of any non-native
 250                                 binaries. When a binary executes a
 251                                 system call of an architecture that is
 252                                 not listed in this setting, it will be
 253                                 immediately terminated with the SIGSYS
 254                                 signal.</para></listitem>
 255                         </varlistentry>
 256
 257
 258                         <varlistentry>
 259                                 <term><varname>TimerSlackNSec=</varname></term>
 260
 261                                 <listitem><para>Sets the timer slack
 262                                 in nanoseconds for PID 1, which is
 263                                 inherited by all executed processes,
 264                                 unless overridden individually, for
 265                                 example with the
 266                                 <varname>TimerSlackNSec=</varname>
 267                                 setting in service units (for details
 268                                 see
 269                                 <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). The
 270                                 timer slack controls the accuracy of
 271                                 wake-ups triggered by system
 272                                 timers. See
 273                                 <citerefentry><refentrytitle>prctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 274                                 for more information. Note that in
 275                                 contrast to most other time span
 276                                 definitions this parameter takes an
 277                                 integer value in nano-seconds if no
 278                                 unit is specified. The usual time
 279                                 units are understood
 280                                 too.</para></listitem>
 281                         </varlistentry>
 282
 283                         <varlistentry>
 284                                 <term><varname>DefaultTimerAccuracySec=</varname></term>
 285
 286                                 <listitem><para>Sets the default
 287                                 accuracy of timer units. This controls
 288                                 the global default for the
 289                                 <varname>AccuracySec=</varname>
 290                                 setting of timer units, see
 291                                 <citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 292                                 for
 293                                 details. <varname>AccuracySec=</varname>
 294                                 set in individual units override the
 295                                 global default for the specific
 296                                 unit. Defaults to 1min. Note that the
 297                                 accuracy of timer units is also
 298                                 affected by the configured timer slack
 299                                 for PID 1, see
 300                                 <varname>TimerSlackNSec=</varname>
 301                                 above.</para></listitem>
 302                         </varlistentry>
 303
 304                         <varlistentry>
 305                                 <term><varname>DefaultTimeoutStartSec=</varname></term>
 306                                 <term><varname>DefaultTimeoutStopSec=</varname></term>
 307                                 <term><varname>DefaultRestartSec=</varname></term>
 308
 309                                 <listitem><para>Configures the default
 310                                 timeouts for starting and stopping of
 311                                 units, as well as the default time to
 312                                 sleep between automatic restarts of
 313                                 units, as configured per-unit in
 314                                 <varname>TimeoutStartSec=</varname>,
 315                                 <varname>TimeoutStopSec=</varname> and
 316                                 <varname>RestartSec=</varname> (for
 317                                 services, see
 318                                 <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 319                                 for details on the per-unit
 320                                 settings). For non-service units,
 321                                 <varname>DefaultTimeoutStartSec=</varname>
 322                                 sets the default
 323                                 <varname>TimeoutSec=</varname> value.
 324                                 </para></listitem>
 325                         </varlistentry>
 326
 327                         <varlistentry>
 328                                 <term><varname>DefaultStartLimitInterval=</varname></term>
 329                                 <term><varname>DefaultStartLimitBurst=</varname></term>
 330
 331                                 <listitem><para>Configure the default
 332                                 unit start rate limiting, as
 333                                 configured per-service by
 334                                 <varname>StartLimitInterval=</varname>
 335                                 and
 336                                 <varname>StartLimitBurst=</varname>. See
 337                                 <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 338                                 for details on the per-service
 339                                 settings.</para></listitem>
 340                         </varlistentry>
 341
 342                         <varlistentry>
 343                                 <term><varname>DefaultEnvironment=</varname></term>
 344
 345                                 <listitem><para>Sets manager
 346                                 environment variables passed to all
 347                                 executed processes. Takes a
 348                                 space-separated list of variable
 349                                 assignments. See
 350                                 <citerefentry project='man-pages'><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 351                                 for details about environment
 352                                 variables.</para>
 353
 354                                 <para>Example:
 355
 356                                 <programlisting>DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"</programlisting>
 357
 358                                 Sets three variables
 359                                 <literal>VAR1</literal>,
 360                                 <literal>VAR2</literal>,
 361                                 <literal>VAR3</literal>.</para></listitem>
 362                         </varlistentry>
 363
 364                         <varlistentry>
 365                                 <term><varname>DefaultCPUAccounting=</varname></term>
 366                                 <term><varname>DefaultBlockIOAccounting=</varname></term>
 367                                 <term><varname>DefaultMemoryAccounting=</varname></term>
 368
 369                                 <listitem><para>Configure the default
 370                                 resource accounting settings, as
 371                                 configured per-unit by
 372                                 <varname>CPUAccounting=</varname>,
 373                                 <varname>BlockIOAccounting=</varname>
 374                                 and
 375                                 <varname>MemoryAccounting=</varname>. See
 376                                 <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 377                                 for details on the per-unit
 378                                 settings.</para></listitem>
 379                         </varlistentry>
 380
 381                         <varlistentry>
 382                                 <term><varname>DefaultLimitCPU=</varname></term>
 383                                 <term><varname>DefaultLimitFSIZE=</varname></term>
 384                                 <term><varname>DefaultLimitDATA=</varname></term>
 385                                 <term><varname>DefaultLimitSTACK=</varname></term>
 386                                 <term><varname>DefaultLimitCORE=</varname></term>
 387                                 <term><varname>DefaultLimitRSS=</varname></term>
 388                                 <term><varname>DefaultLimitNOFILE=</varname></term>
 389                                 <term><varname>DefaultLimitAS=</varname></term>
 390                                 <term><varname>DefaultLimitNPROC=</varname></term>
 391                                 <term><varname>DefaultLimitMEMLOCK=</varname></term>
 392                                 <term><varname>DefaultLimitLOCKS=</varname></term>
 393                                 <term><varname>DefaultLimitSIGPENDING=</varname></term>
 394                                 <term><varname>DefaultLimitMSGQUEUE=</varname></term>
 395                                 <term><varname>DefaultLimitNICE=</varname></term>
 396                                 <term><varname>DefaultLimitRTPRIO=</varname></term>
 397                                 <term><varname>DefaultLimitRTTIME=</varname></term>
 398
 399                                 <listitem><para>These settings control
 400                                 various default resource limits for
 401                                 units. See
 402                                 <citerefentry><refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 403                                 for details. Use the string
 404                                 <varname>infinity</varname> to
 405                                 configure no limit on a specific
 406                                 resource. These settings may be
 407                                 overridden in individual units
 408                                 using the corresponding LimitXXX=
 409                                 directives. Note that these resource
 410                                 limits are only defaults for units,
 411                                 they are not applied to PID 1
 412                                 itself.</para></listitem>
 413                         </varlistentry>
 414                 </variablelist>
 415         </refsect1>
 416
 417         <refsect1>
 418                   <title>See Also</title>
 419                   <para>
 420                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 421                           <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 422                           <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 423                           <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 424                           <citerefentry project='man-pages'><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 425                           <citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 426                   </para>
 427         </refsect1>
 428
 429 </refentry>