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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>systemd.journal-fields</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style>
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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 215</span><hr><div class="refentry"><a name="systemd.journal-fields"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd.journal-fields — Special journal fields</p></div><div class="refsect1"><a name="idm214184810768"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p>Entries in the journal resemble an environment
block in their syntax but with fields that can
include binary data. Primarily, fields are formatted
UTF-8 text strings, and binary formatting is used only
where formatting as UTF-8 text strings makes little
sense. New fields may freely be defined by
applications, but a few fields have special
meaning. All fields with special meanings are
optional. In some cases, fields may appear more than
once per entry.</p></div><div class="refsect1"><a name="idm214184434256"></a><h2 id="User Journal Fields">User Journal Fields<a class="headerlink" title="Permalink to this headline" href="#User%20Journal%20Fields">¶</a></h2><p>User fields are fields that are directly passed
from clients and stored in the journal.</p><div class="variablelist"><dl class="variablelist"><dt id="MESSAGE="><span class="term"><code class="varname">MESSAGE=</code></span><a class="headerlink" title="Permalink to this term" href="#MESSAGE=">¶</a></dt><dd><p>The human-readable
message string for this
entry. This is supposed to be
the primary text shown to the
user. It is usually not
translated (but might be in
some cases), and is not
supposed to be parsed for meta
data.</p></dd><dt id="MESSAGE_ID="><span class="term"><code class="varname">MESSAGE_ID=</code></span><a class="headerlink" title="Permalink to this term" href="#MESSAGE_ID=">¶</a></dt><dd><p>A 128-bit message
identifier ID for recognizing
certain message types, if this
is desirable. This should
contain a 128-bit ID formatted
as a lower-case hexadecimal
string, without any separating
dashes or suchlike. This is
recommended to be a
UUID-compatible ID, but this is not
enforced, and formatted
differently. Developers can
generate a new ID for this
purpose with <span class="command"><strong>journalctl
<code class="option">--new-id</code></strong></span>.
</p></dd><dt id="PRIORITY="><span class="term"><code class="varname">PRIORITY=</code></span><a class="headerlink" title="Permalink to this term" href="#PRIORITY=">¶</a></dt><dd><p>A priority value between
0 ("<code class="literal">emerg</code>")
and 7
("<code class="literal">debug</code>")
formatted as a decimal
string. This field is
compatible with syslog's
priority concept.</p></dd><dt id="CODE_FILE="><span class="term"><code class="varname">CODE_FILE=</code>, </span><span class="term"><code class="varname">CODE_LINE=</code>, </span><span class="term"><code class="varname">CODE_FUNC=</code></span><a class="headerlink" title="Permalink to this term" href="#CODE_FILE=">¶</a></dt><dd><p>The code location
generating this message, if
known. Contains the source
filename, the line number and
the function name.</p></dd><dt id="ERRNO="><span class="term"><code class="varname">ERRNO=</code></span><a class="headerlink" title="Permalink to this term" href="#ERRNO=">¶</a></dt><dd><p>The low-level Unix error
number causing this entry, if
any. Contains the numeric
value of
<a href="errno.html"><span class="citerefentry"><span class="refentrytitle">errno</span>(3)</span></a>
formatted as a decimal
string.</p></dd><dt id="SYSLOG_FACILITY="><span class="term"><code class="varname">SYSLOG_FACILITY=</code>, </span><span class="term"><code class="varname">SYSLOG_IDENTIFIER=</code>, </span><span class="term"><code class="varname">SYSLOG_PID=</code></span><a class="headerlink" title="Permalink to this term" href="#SYSLOG_FACILITY=">¶</a></dt><dd><p>Syslog compatibility
fields containing the facility
(formatted as decimal string),
the identifier string
(i.e. "tag"), and the client
PID. (Note that the tag is
usually derived from glibc's
<code class="varname">program_invocation_short_name</code>
variable, see <a href="program_invocation_short_name.html"><span class="citerefentry"><span class="refentrytitle">program_invocation_short_name</span>(3)</span></a>.)</p></dd></dl></div></div><div class="refsect1"><a name="idm214186362608"></a><h2 id="Trusted Journal Fields">Trusted Journal Fields<a class="headerlink" title="Permalink to this headline" href="#Trusted%20Journal%20Fields">¶</a></h2><p>Fields prefixed with an underscore are trusted
fields, i.e. fields that are implicitly added by the
journal and cannot be altered by client code.</p><div class="variablelist"><dl class="variablelist"><dt id="_PID="><span class="term"><code class="varname">_PID=</code>, </span><span class="term"><code class="varname">_UID=</code>, </span><span class="term"><code class="varname">_GID=</code></span><a class="headerlink" title="Permalink to this term" href="#_PID=">¶</a></dt><dd><p>The process, user, and
group ID of the process the
journal entry originates from
formatted as a decimal
string.</p></dd><dt id="_COMM="><span class="term"><code class="varname">_COMM=</code>, </span><span class="term"><code class="varname">_EXE=</code>, </span><span class="term"><code class="varname">_CMDLINE=</code></span><a class="headerlink" title="Permalink to this term" href="#_COMM=">¶</a></dt><dd><p>The name, the executable
path, and the command line of
the process the journal entry
originates from.</p></dd><dt id="_CAP_EFFECTIVE="><span class="term"><code class="varname">_CAP_EFFECTIVE=</code></span><a class="headerlink" title="Permalink to this term" href="#_CAP_EFFECTIVE=">¶</a></dt><dd><p>The effective <a href="capabilities.html"><span class="citerefentry"><span class="refentrytitle">capabilities</span>(7)</span></a> of
the process the journal entry
originates from.</p></dd><dt id="_AUDIT_SESSION="><span class="term"><code class="varname">_AUDIT_SESSION=</code>, </span><span class="term"><code class="varname">_AUDIT_LOGINUID=</code></span><a class="headerlink" title="Permalink to this term" href="#_AUDIT_SESSION=">¶</a></dt><dd><p>The session and login
UID of the process the journal
entry originates from, as
maintained by the kernel audit
subsystem.</p></dd><dt id="_SYSTEMD_CGROUP="><span class="term"><code class="varname">_SYSTEMD_CGROUP=</code>, </span><span class="term"><code class="varname">_SYSTEMD_SESSION=</code>, </span><span class="term"><code class="varname">_SYSTEMD_UNIT=</code>, </span><span class="term"><code class="varname">_SYSTEMD_USER_UNIT=</code>, </span><span class="term"><code class="varname">_SYSTEMD_OWNER_UID=</code>, </span><span class="term"><code class="varname">_SYSTEMD_SLICE=</code></span><a class="headerlink" title="Permalink to this term" href="#_SYSTEMD_CGROUP=">¶</a></dt><dd><p>The control group path
in the systemd hierarchy, the
systemd session ID (if any),
the systemd unit name (if
any), the systemd user session
unit name (if any), the owner
UID of the systemd session (if
any) and the systemd slice
unit of the process the
journal entry originates
from.</p></dd><dt id="_SELINUX_CONTEXT="><span class="term"><code class="varname">_SELINUX_CONTEXT=</code></span><a class="headerlink" title="Permalink to this term" href="#_SELINUX_CONTEXT=">¶</a></dt><dd><p>The SELinux security
context (label) of the process
the journal entry originates
from.</p></dd><dt id="_SOURCE_REALTIME_TIMESTAMP="><span class="term"><code class="varname">_SOURCE_REALTIME_TIMESTAMP=</code></span><a class="headerlink" title="Permalink to this term" href="#_SOURCE_REALTIME_TIMESTAMP=">¶</a></dt><dd><p>The earliest trusted
timestamp of the message, if
any is known that is different
from the reception time of the
journal. This is the time in
microseconds since the epoch UTC,
formatted as a decimal
string.</p></dd><dt id="_BOOT_ID="><span class="term"><code class="varname">_BOOT_ID=</code></span><a class="headerlink" title="Permalink to this term" href="#_BOOT_ID=">¶</a></dt><dd><p>The kernel boot ID for
the boot the message was
generated in, formatted as
a 128-bit hexadecimal
string.</p></dd><dt id="_MACHINE_ID="><span class="term"><code class="varname">_MACHINE_ID=</code></span><a class="headerlink" title="Permalink to this term" href="#_MACHINE_ID=">¶</a></dt><dd><p>The machine ID of the
originating host, as available
in
<a href="machine-id.html"><span class="citerefentry"><span class="refentrytitle">machine-id</span>(5)</span></a>.</p></dd><dt id="_HOSTNAME="><span class="term"><code class="varname">_HOSTNAME=</code></span><a class="headerlink" title="Permalink to this term" href="#_HOSTNAME=">¶</a></dt><dd><p>The name of the
originating host.</p></dd><dt id="_TRANSPORT="><span class="term"><code class="varname">_TRANSPORT=</code></span><a class="headerlink" title="Permalink to this term" href="#_TRANSPORT=">¶</a></dt><dd><p>How the entry was
received by the journal
service. Valid transports are:
</p><div class="variablelist"><dl class="variablelist"><dt id="
driver
"><span class="term">
<code class="option">driver</code>
</span><a class="headerlink" title="Permalink to this term" href="#%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20driver%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20">¶</a></dt><dd><p>for
internally
generated
messages
</p></dd><dt id="
syslog
"><span class="term">
<code class="option">syslog</code>
</span><a class="headerlink" title="Permalink to this term" href="#%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20syslog%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20">¶</a></dt><dd><p>for those
received via the
local syslog
socket with the
syslog protocol
</p></dd><dt id="
journal
"><span class="term">
<code class="option">journal</code>
</span><a class="headerlink" title="Permalink to this term" href="#%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20journal%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20">¶</a></dt><dd><p>for those
received via the
native journal
protocol
</p></dd><dt id="
stdout
"><span class="term">
<code class="option">stdout</code>
</span><a class="headerlink" title="Permalink to this term" href="#%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20stdout%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20">¶</a></dt><dd><p>for those
read from a
service's
standard output
or error output
</p></dd><dt id="
kernel
"><span class="term">
<code class="option">kernel</code>
</span><a class="headerlink" title="Permalink to this term" href="#%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20kernel%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20">¶</a></dt><dd><p>for those
read from the
kernel
</p></dd></dl></div></dd></dl></div></div><div class="refsect1"><a name="idm214184538176"></a><h2 id="Kernel Journal Fields">Kernel Journal Fields<a class="headerlink" title="Permalink to this headline" href="#Kernel%20Journal%20Fields">¶</a></h2><p>Kernel fields are fields that are used by
messages originating in the kernel and stored in the
journal.</p><div class="variablelist"><dl class="variablelist"><dt id="_KERNEL_DEVICE="><span class="term"><code class="varname">_KERNEL_DEVICE=</code></span><a class="headerlink" title="Permalink to this term" href="#_KERNEL_DEVICE=">¶</a></dt><dd><p>The kernel device
name. If the entry is
associated to a block device,
the major and minor of the
device node, separated by "<code class="literal">:</code>"
and prefixed by "<code class="literal">b</code>". Similar
for character devices but
prefixed by "<code class="literal">c</code>". For network
devices, this is the interface index
prefixed by "<code class="literal">n</code>". For all other
devices, this is the subsystem name
prefixed by "<code class="literal">+</code>", followed by
"<code class="literal">:</code>", followed by the kernel
device name.</p></dd><dt id="_KERNEL_SUBSYSTEM="><span class="term"><code class="varname">_KERNEL_SUBSYSTEM=</code></span><a class="headerlink" title="Permalink to this term" href="#_KERNEL_SUBSYSTEM=">¶</a></dt><dd><p>The kernel subsystem name.</p></dd><dt id="_UDEV_SYSNAME="><span class="term"><code class="varname">_UDEV_SYSNAME=</code></span><a class="headerlink" title="Permalink to this term" href="#_UDEV_SYSNAME=">¶</a></dt><dd><p>The kernel device name
as it shows up in the device
tree below
<code class="filename">/sys</code>.</p></dd><dt id="_UDEV_DEVNODE="><span class="term"><code class="varname">_UDEV_DEVNODE=</code></span><a class="headerlink" title="Permalink to this term" href="#_UDEV_DEVNODE=">¶</a></dt><dd><p>The device node path of
this device in
<code class="filename">/dev</code>.</p></dd><dt id="_UDEV_DEVLINK="><span class="term"><code class="varname">_UDEV_DEVLINK=</code></span><a class="headerlink" title="Permalink to this term" href="#_UDEV_DEVLINK=">¶</a></dt><dd><p>Additional symlink names
pointing to the device node in
<code class="filename">/dev</code>. This
field is frequently set more
than once per entry.</p></dd></dl></div></div><div class="refsect1"><a name="idm214185136352"></a><h2 id="Fields to log on behalf of a different program">Fields to log on behalf of a different program<a class="headerlink" title="Permalink to this headline" href="#Fields%20to%20log%20on%20behalf%20of%20a%20different%20program">¶</a></h2><p>Fields in this section are used by programs
to specify that they are logging on behalf of another
program or unit.
</p><p>Fields used by the <span class="command"><strong>systemd-coredump</strong></span>
coredump kernel helper:
</p><div class="variablelist"><dl class="variablelist"><dt id="COREDUMP_UNIT="><span class="term"><code class="varname">COREDUMP_UNIT=</code>, </span><span class="term"><code class="varname">COREDUMP_USER_UNIT=</code></span><a class="headerlink" title="Permalink to this term" href="#COREDUMP_UNIT=">¶</a></dt><dd><p>Used to annotate
messages containing coredumps from
system and session units.
See
<a href="coredumpctl.html"><span class="citerefentry"><span class="refentrytitle">coredumpctl</span>(1)</span></a>.
</p></dd></dl></div><p>Priviledged programs (currently UID 0) may
attach <code class="varname">OBJECT_PID=</code> to a
message. This will instruct
<span class="command"><strong>systemd-journald</strong></span> to attach
additional fields on behalf of the caller:</p><div class="variablelist"><dl class="variablelist"><dt id="OBJECT_PID=PID"><span class="term"><code class="varname">OBJECT_PID=<em class="replaceable"><code>PID</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#OBJECT_PID=PID">¶</a></dt><dd><p>PID of the program that this
message pertains to.
</p></dd><dt id="OBJECT_UID="><span class="term"><code class="varname">OBJECT_UID=</code>, </span><span class="term"><code class="varname">OBJECT_GID=</code>, </span><span class="term"><code class="varname">OBJECT_COMM=</code>, </span><span class="term"><code class="varname">OBJECT_EXE=</code>, </span><span class="term"><code class="varname">OBJECT_CMDLINE=</code>, </span><span class="term"><code class="varname">OBJECT_AUDIT_SESSION=</code>, </span><span class="term"><code class="varname">OBJECT_AUDIT_LOGINUID=</code>, </span><span class="term"><code class="varname">OBJECT_SYSTEMD_CGROUP=</code>, </span><span class="term"><code class="varname">OBJECT_SYSTEMD_SESSION=</code>, </span><span class="term"><code class="varname">OBJECT_SYSTEMD_OWNER_UID=</code>, </span><span class="term"><code class="varname">OBJECT_SYSTEMD_UNIT=</code>, </span><span class="term"><code class="varname">OBJECT_SYSTEMD_USER_UNIT=</code></span><a class="headerlink" title="Permalink to this term" href="#OBJECT_UID=">¶</a></dt><dd><p>These are additional fields added automatically
by <span class="command"><strong>systemd-journald</strong></span>.
Their meaning is the same as
<code class="varname">_UID=</code>,
<code class="varname">_GID=</code>,
<code class="varname">_COMM=</code>,
<code class="varname">_EXE=</code>,
<code class="varname">_CMDLINE=</code>,
<code class="varname">_AUDIT_SESSION=</code>,
<code class="varname">_AUDIT_LOGINUID=</code>,
<code class="varname">_SYSTEMD_CGROUP=</code>,
<code class="varname">_SYSTEMD_SESSION=</code>,
<code class="varname">_SYSTEMD_UNIT=</code>,
<code class="varname">_SYSTEMD_USER_UNIT=</code>, and
<code class="varname">_SYSTEMD_OWNER_UID=</code>
as described above, except that the
process identified by <em class="replaceable"><code>PID</code></em>
is described, instead of the process
which logged the message.</p></dd></dl></div></div><div class="refsect1"><a name="idm214186169520"></a><h2 id="Address Fields">Address Fields<a class="headerlink" title="Permalink to this headline" href="#Address%20Fields">¶</a></h2><p>During serialization into external formats, such
as the <a class="ulink" href="http://www.freedesktop.org/wiki/Software/systemd/export" target="_top">Journal
Export Format</a> or the <a class="ulink" href="http://www.freedesktop.org/wiki/Software/systemd/json" target="_top">Journal
JSON Format</a>, the addresses of journal entries
are serialized into fields prefixed with double
underscores. Note that these are not proper fields when
stored in the journal but for addressing metadata of
entries. They cannot be written as part of structured
log entries via calls such as
<a href="sd_journal_send.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_send</span>(3)</span></a>. They
may also not be used as matches for
<a href="sd_journal_add_match.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_add_match</span>(3)</span></a></p><div class="variablelist"><dl class="variablelist"><dt id="__CURSOR="><span class="term"><code class="varname">__CURSOR=</code></span><a class="headerlink" title="Permalink to this term" href="#__CURSOR=">¶</a></dt><dd><p>The cursor for the
entry. A cursor is an opaque
text string that uniquely
describes the position of an
entry in the journal and is
portable across machines,
platforms and journal files.
</p></dd><dt id="__REALTIME_TIMESTAMP="><span class="term"><code class="varname">__REALTIME_TIMESTAMP=</code></span><a class="headerlink" title="Permalink to this term" href="#__REALTIME_TIMESTAMP=">¶</a></dt><dd><p>The wallclock time
(<code class="constant">CLOCK_REALTIME</code>)
at the point in time the entry
was received by the journal,
in microseconds since the epoch
UTC, formatted as a decimal
string. This has different
properties from
"<code class="literal">_SOURCE_REALTIME_TIMESTAMP=</code>",
as it is usually a bit later
but more likely to be monotonic.
</p></dd><dt id="__MONOTONIC_TIMESTAMP="><span class="term"><code class="varname">__MONOTONIC_TIMESTAMP=</code></span><a class="headerlink" title="Permalink to this term" href="#__MONOTONIC_TIMESTAMP=">¶</a></dt><dd><p>The monotonic time
(<code class="constant">CLOCK_MONOTONIC</code>)
at the point in time the entry
was received by the journal in
microseconds, formatted as a decimal
string. To be useful as an
address for the entry, this
should be combined with with the
boot ID in "<code class="literal">_BOOT_ID=</code>".
</p></dd></dl></div></div><div class="refsect1"><a name="idm214184586832"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
<a href="journalctl.html"><span class="citerefentry"><span class="refentrytitle">journalctl</span>(1)</span></a>,
<a href="journald.conf.html"><span class="citerefentry"><span class="refentrytitle">journald.conf</span>(5)</span></a>,
<a href="sd-journal.html"><span class="citerefentry"><span class="refentrytitle">sd-journal</span>(3)</span></a>,
<a href="coredumpctl.html"><span class="citerefentry"><span class="refentrytitle">coredumpctl</span>(1)</span></a>,
<a href="systemd.directives.html"><span class="citerefentry"><span class="refentrytitle">systemd.directives</span>(7)</span></a>
</p></div></div></body></html>
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