man/journald.conf.xml

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  24
  25 <refentry id="journald.conf">
  26         <refentryinfo>
  27                 <title>journald.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>journald.conf</refentrytitle>
  42                 <manvolnum>5</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>journald.conf</refname>
  47                 <refpurpose>Journal service configuration file</refpurpose>
  48         </refnamediv>
  49
  50         <refsynopsisdiv>
  51                 <para><filename>/etc/systemd/journald.conf</filename></para>
  52         </refsynopsisdiv>
  53
  54         <refsect1>
  55                 <title>Description</title>
  56
  57                 <para>This files configures various parameters of the
  58                 systemd journal service
  59                 <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
  60
  61         </refsect1>
  62
  63         <refsect1>
  64                 <title>Options</title>
  65
  66                 <para>All options are configured in the
  67                 <literal>[Journal]</literal> section:</para>
  68
  69                 <variablelist>
  70
  71                         <varlistentry>
  72                                 <term><varname>Storage=</varname></term>
  73
  74                                 <listitem><para>Controls where to
  75                                 store journal data. One of
  76                                 <literal>volatile</literal>,
  77                                 <literal>persistent</literal>,
  78                                 <literal>auto</literal> and
  79                                 <literal>none</literal>. If
  80                                 <literal>volatile</literal> journal
  81                                 log data will be stored only in
  82                                 memory, i.e. below the
  83                                 <filename>/run/log/journal</filename>
  84                                 hierarchy (which is created if
  85                                 needed). If
  86                                 <literal>persistent</literal> data will
  87                                 be stored preferably on disk,
  88                                 i.e. below the
  89                                 <filename>/var/log/journal</filename>
  90                                 hierarchy (which is created if
  91                                 needed), with a fallback to
  92                                 <filename>/run/log/journal</filename>
  93                                 (which is created if needed), during
  94                                 early boot and if the disk is not
  95                                 writable. <literal>auto</literal> is
  96                                 similar to
  97                                 <literal>persistent</literal> but the
  98                                 directory
  99                                 <filename>/var/log/journal</filename>
 100                                 is not created if needed, so that its
 101                                 existence controls where log data
 102                                 goes. <literal>none</literal> turns
 103                                 off all storage, all log data received
 104                                 will be dropped. Forwarding to other
 105                                 targets, such as the console, the
 106                                 kernel log buffer or a syslog daemon
 107                                 will still work however.  Defaults to
 108                                 <literal>auto</literal>.</para></listitem>
 109                         </varlistentry>
 110
 111                         <varlistentry>
 112                                 <term><varname>Compress=</varname></term>
 113
 114                                 <listitem><para>Takes a boolean
 115                                 value. If enabled (the default) data
 116                                 objects that shall be stored in the
 117                                 journal and are larger than a certain
 118                                 threshold are compressed with the XZ
 119                                 compression algorithm before they are
 120                                 written to the file
 121                                 system.</para></listitem>
 122                         </varlistentry>
 123
 124                         <varlistentry>
 125                                 <term><varname>Seal=</varname></term>
 126
 127                                 <listitem><para>Takes a boolean
 128                                 value. If enabled (the default) and a
 129                                 sealing key is available (as created
 130                                 by
 131                                 <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
 132                                 <option>--setup-keys</option>
 133                                 command), forward secure sealing (FSS)
 134                                 for all persistent journal files is
 135                                 enabled. FSS is based on <ulink
 136                                 url="http://eprint.iacr.org/2013/397">Seekable
 137                                 Sequential Key Generators</ulink> by
 138                                 G. A. Marson and B. Poettering and
 139                                 may be used to protect journal files
 140                                 from unnoticed
 141                                 alteration.</para></listitem>
 142                         </varlistentry>
 143
 144                         <varlistentry>
 145                                 <term><varname>SplitMode=</varname></term>
 146
 147                                 <listitem><para>Controls whether to
 148                                 split up journal files per user. One
 149                                 of <literal>login</literal>,
 150                                 <literal>uid</literal> and
 151                                 <literal>none</literal>. If
 152                                 <literal>login</literal> each logged
 153                                 in user will get his own journal
 154                                 files, but systemd user IDs will log
 155                                 into the system journal. If
 156                                 <literal>uid</literal> any user ID
 157                                 will get his own journal files
 158                                 regardless whether it belongs to a
 159                                 system service or refers to a real
 160                                 logged in user. If
 161                                 <literal>none</literal> journal files
 162                                 are not split up per-user and all
 163                                 messages are stored in the single
 164                                 system journal. Note that splitting
 165                                 up journal files per-user is only
 166                                 available of journals are stored
 167                                 persistently. If journals are stored
 168                                 on volatile storage (see above) only a
 169                                 single journal file for all user IDs
 170                                 is kept. Defaults to
 171                                 <literal>login</literal>.</para></listitem>
 172                         </varlistentry>
 173
 174                         <varlistentry>
 175                                 <term><varname>RateLimitInterval=</varname></term>
 176                                 <term><varname>RateLimitBurst=</varname></term>
 177
 178                                 <listitem><para>Configures the rate
 179                                 limiting that is applied to all
 180                                 messages generated on the system. If
 181                                 in the time interval defined by
 182                                 <varname>RateLimitInterval=</varname>
 183                                 more messages than specified in
 184                                 <varname>RateLimitBurst=</varname> are
 185                                 logged by a service all further
 186                                 messages within the interval are
 187                                 dropped, until the interval is over. A
 188                                 message about the number of dropped
 189                                 messages is generated. This rate
 190                                 limiting is applied per-service, so
 191                                 that two services which log do not
 192                                 interfere with each other's
 193                                 limits. Defaults to 200 messages in
 194                                 10s. The time specification for
 195                                 <varname>RateLimitInterval=</varname>
 196                                 may be specified in the following
 197                                 units: <literal>s</literal>,
 198                                 <literal>min</literal>,
 199                                 <literal>h</literal>,
 200                                 <literal>ms</literal>,
 201                                 <literal>us</literal>. To turn off any
 202                                 kind of rate limiting, set either
 203                                 value to 0.</para></listitem>
 204                         </varlistentry>
 205
 206                         <varlistentry>
 207                                 <term><varname>SystemMaxUse=</varname></term>
 208                                 <term><varname>SystemKeepFree=</varname></term>
 209                                 <term><varname>SystemMaxFileSize=</varname></term>
 210                                 <term><varname>RuntimeMaxUse=</varname></term>
 211                                 <term><varname>RuntimeKeepFree=</varname></term>
 212                                 <term><varname>RuntimeMaxFileSize=</varname></term>
 213
 214                                 <listitem><para>Enforce size limits on
 215                                 the journal files stored. The options
 216                                 prefixed with
 217                                 <literal>System</literal> apply to the
 218                                 journal files when stored on a
 219                                 persistent file system, more
 220                                 specifically
 221                                 <filename>/var/log/journal</filename>. The
 222                                 options prefixed with
 223                                 <literal>Runtime</literal> apply to
 224                                 the journal files when stored on a
 225                                 volatile in-memory file system, more
 226                                 specifically
 227                                 <filename>/run/log/journal</filename>. The
 228                                 former is used only when
 229                                 <filename>/var</filename> is mounted,
 230                                 writable and the directory
 231                                 <filename>/var/log/journal</filename>
 232                                 exists. Otherwise only the latter
 233                                 applies. Note that this means that
 234                                 during early boot and if the
 235                                 administrator disabled persistent
 236                                 logging only the latter options apply,
 237                                 while the former apply if persistent
 238                                 logging is enabled and the system is
 239                                 fully booted
 240                                 up. <varname>SystemMaxUse=</varname>
 241                                 and <varname>RuntimeMaxUse=</varname>
 242                                 control how much disk space the
 243                                 journal may use up at
 244                                 maximum. Defaults to 10% of the size
 245                                 of the respective file
 246                                 system. <varname>SystemKeepFree=</varname>
 247                                 and
 248                                 <varname>RuntimeKeepFree=</varname>
 249                                 control how much disk space the
 250                                 journal shall always leave free for
 251                                 other uses if less than the disk space
 252                                 configured in
 253                                 <varname>SystemMaxUse=</varname> and
 254                                 <varname>RuntimeMaxUse=</varname> is
 255                                 available. Defaults to 15% of the size
 256                                 of the respective file
 257                                 system. <varname>SystemMaxFileSize=</varname>
 258                                 and
 259                                 <varname>RuntimeMaxFileSize=</varname>
 260                                 control how large individual journal
 261                                 files may grow at maximum. This
 262                                 influences the granularity in which
 263                                 disk space is made available through
 264                                 rotation, i.e. deletion of historic
 265                                 data. Defaults to one eighth of the
 266                                 values configured with
 267                                 <varname>SystemMaxUse=</varname> and
 268                                 <varname>RuntimeMaxUse=</varname>, so
 269                                 that usually seven rotated journal
 270                                 files are kept as history. Specify
 271                                 values in bytes or use K, M, G, T, P,
 272                                 E as units for the specified sizes
 273                                 (equal to 1024, 1024²,... bytes).
 274                                 Note that size limits are
 275                                 enforced synchronously to journal
 276                                 files as they are extended, and need
 277                                 no explicit rotation step triggered by
 278                                 time.</para></listitem>
 279                         </varlistentry>
 280
 281                         <varlistentry>
 282                                 <term><varname>MaxFileSec=</varname></term>
 283
 284                                 <listitem><para>The maximum time to
 285                                 store entries in a single journal
 286                                 file, before rotating to the next
 287                                 one. Normally time-based rotation
 288                                 should not be required as size-based
 289                                 rotation with options such as
 290                                 <varname>SystemMaxFileSize=</varname>
 291                                 should be sufficient to ensure that
 292                                 journal files don't grow without
 293                                 bounds. However, to ensure that not
 294                                 too much data is lost at once when old
 295                                 journal files are deleted it might
 296                                 make sense to change this value from
 297                                 the default of one month. Set to 0 to
 298                                 turn off this feature. This setting
 299                                 takes time values which may be
 300                                 suffixed with the units year, month,
 301                                 week, day, h, m to override the
 302                                 default time unit of
 303                                 seconds.</para></listitem>
 304                         </varlistentry>
 305
 306                         <varlistentry>
 307                                 <term><varname>MaxRetentionSec=</varname></term>
 308
 309                                 <listitem><para>The maximum time to
 310                                 store journal entries. This
 311                                 controls whether journal files
 312                                 containing entries older then the
 313                                 specified time span are
 314                                 deleted. Normally time-based deletion
 315                                 of old journal files should not be
 316                                 required as size-based deletion with
 317                                 options such as
 318                                 <varname>SystemMaxUse=</varname>
 319                                 should be sufficient to ensure that
 320                                 journal files don't grow without
 321                                 bounds. However, to enforce data
 322                                 retention policies it might make sense
 323                                 to change this value from the
 324                                 default of 0 (which turns off this
 325                                 feature). This setting also takes
 326                                 time values which may be suffixed with
 327                                 the units year, month, week, day, h, m
 328                                 to override the default time unit of
 329                                 seconds. </para></listitem>
 330                         </varlistentry>
 331
 332
 333                         <varlistentry>
 334                                 <term><varname>SyncIntervalSec=</varname></term>
 335
 336                                 <listitem><para>The timeout before syncing journal
 337                                 data to disk. After syncing journal files have
 338                                 OFFLINE state. Default timeout is 5 minutes.
 339                                 </para></listitem>
 340                         </varlistentry>
 341
 342                         <varlistentry>
 343                                 <term><varname>ForwardToSyslog=</varname></term>
 344                                 <term><varname>ForwardToKMsg=</varname></term>
 345                                 <term><varname>ForwardToConsole=</varname></term>
 346
 347                                 <listitem><para>Control whether log
 348                                 messages received by the journal
 349                                 daemon shall be forwarded to a
 350                                 traditional syslog daemon, to the
 351                                 kernel log buffer (kmsg), or to the
 352                                 system console. These options take
 353                                 boolean arguments. If forwarding to
 354                                 syslog is enabled but no syslog daemon
 355                                 is running the respective option has
 356                                 no effect. By default only forwarding
 357                                 to syslog is enabled. These settings
 358                                 may be overridden at boot time with
 359                                 the kernel command line options
 360                                 <literal>systemd.journald.forward_to_syslog=</literal>,
 361                                 <literal>systemd.journald.forward_to_kmsg=</literal>
 362                                 and
 363                                 <literal>systemd.journald.forward_to_console=</literal>.
 364                                 </para></listitem>
 365                         </varlistentry>
 366
 367                         <varlistentry>
 368                                 <term><varname>MaxLevelStore=</varname></term>
 369                                 <term><varname>MaxLevelSyslog=</varname></term>
 370                                 <term><varname>MaxLevelKMsg=</varname></term>
 371                                 <term><varname>MaxLevelConsole=</varname></term>
 372
 373                                 <listitem><para>Controls the maximum
 374                                 log level of messages that are stored
 375                                 on disk, forwarded to syslog, kmsg or
 376                                 the console (if that is enabled, see
 377                                 above). As argument, takes one of
 378                                 <literal>emerg</literal>,
 379                                 <literal>alert</literal>,
 380                                 <literal>crit</literal>,
 381                                 <literal>err</literal>,
 382                                 <literal>warning</literal>,
 383                                 <literal>notice</literal>,
 384                                 <literal>info</literal>,
 385                                 <literal>debug</literal> or integer
 386                                 values in the range of 0..7 (corresponding
 387                                 to the same levels). Messages equal or below
 388                                 the log level specified are
 389                                 stored/forwarded, messages above are
 390                                 dropped. Defaults to
 391                                 <literal>debug</literal> for
 392                                 <varname>MaxLevelStore=</varname> and
 393                                 <varname>MaxLevelSyslog=</varname>, to
 394                                 ensure that the all messages are
 395                                 written to disk and forwarded to
 396                                 syslog. Defaults to
 397                                 <literal>notice</literal> for
 398                                 <varname>MaxLevelKMsg=</varname> and
 399                                 <literal>info</literal> for
 400                                 <varname>MaxLevelConsole=</varname>.</para></listitem>
 401                         </varlistentry>
 402
 403                         <varlistentry>
 404                                 <term><varname>TTYPath=</varname></term>
 405
 406                                 <listitem><para>Change the console TTY
 407                                 to use if
 408                                 <varname>ForwardToConsole=yes</varname>
 409                                 is used. Defaults to
 410                                 <filename>/dev/console</filename>.</para></listitem>
 411                         </varlistentry>
 412
 413                 </variablelist>
 414
 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-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 422                           <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 423                           <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 424                           <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 425                   </para>
 426         </refsect1>
 427
 428 </refentry>