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506 lines
24 KiB
XML
506 lines
24 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2013 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-run"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-run</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-run</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-run</refname>
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<refpurpose>Run programs in transient scope units, service units, or path-, socket-, or timer-triggered service units</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-run</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain"><replaceable>COMMAND</replaceable>
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<arg choice="opt" rep="repeat">ARGS</arg>
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</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-run</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt" rep="repeat">PATH OPTIONS</arg>
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<arg choice="req"><replaceable>COMMAND</replaceable></arg>
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<arg choice="opt" rep="repeat">ARGS</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-run</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt" rep="repeat">SOCKET OPTIONS</arg>
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<arg choice="req"><replaceable>COMMAND</replaceable></arg>
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<arg choice="opt" rep="repeat">ARGS</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-run</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt" rep="repeat">TIMER OPTIONS</arg>
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<arg choice="req"><replaceable>COMMAND</replaceable></arg>
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<arg choice="opt" rep="repeat">ARGS</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-run</command> may be used to create and start a transient <filename>.service</filename> or
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<filename>.scope</filename> unit and run the specified <replaceable>COMMAND</replaceable> in it. It may also be
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used to create and start a transient <filename>.path</filename>, <filename>.socket</filename>, or
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<filename>.timer</filename> unit, that activates a <filename>.service</filename> unit when elapsing.</para>
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<para>If a command is run as transient service unit, it will be started and managed by the service manager like any
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other service, and thus shows up in the output of <command>systemctl list-units</command> like any other unit. It
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will run in a clean and detached execution environment, with the service manager as its parent process. In this
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mode, <command>systemd-run</command> will start the service asynchronously in the background and return after the
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command has begun execution (unless <option>--no-block</option> or <option>--wait</option> are specified, see
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below).</para>
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<para>If a command is run as transient scope unit, it will be executed by <command>systemd-run</command> itself as
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parent process and will thus inherit the execution environment of the caller. However, the processes of the command
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are managed by the service manager similar to normal services, and will show up in the output of <command>systemctl
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list-units</command>. Execution in this case is synchronous, and will return only when the command finishes. This
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mode is enabled via the <option>--scope</option> switch (see below). </para>
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<para>If a command is run with path, socket, or timer options such as <option>--on-calendar=</option> (see below),
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a transient path, socket, or timer unit is created alongside the service unit for the specified command. Only the
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transient path, socket, or timer unit is started immediately, the transient service unit will be triggered by the
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path, socket, or timer unit. If the <option>--unit=</option> option is specified, the
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<replaceable>COMMAND</replaceable> may be omitted. In this case, <command>systemd-run</command> creates only a
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<filename>.path</filename>, <filename>.socket</filename>, or <filename>.timer</filename> unit that triggers the
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specified unit.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--no-ask-password</option></term>
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<listitem><para>Do not query the user for authentication for
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privileged operations.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--scope</option></term>
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<listitem>
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<para>Create a transient <filename>.scope</filename> unit instead of the default transient
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<filename>.service</filename> unit (see above).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--unit=</option></term>
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<listitem><para>Use this unit name instead of an automatically
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generated one.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--property=</option></term>
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<term><option>-p</option></term>
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<listitem><para>Sets a property on the scope or service unit that is created. This option takes an assignment
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in the same format as
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<command>set-property</command> command.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--description=</option></term>
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<listitem><para>Provide a description for the service, scope, path, socket, or timer unit. If not specified,
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the command itself will be used as a description. See <varname>Description=</varname> in
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--slice=</option></term>
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<listitem><para>Make the new <filename>.service</filename> or <filename>.scope</filename> unit part of the
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specified slice, instead of <filename>system.slice</filename>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-r</option></term>
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<term><option>--remain-after-exit</option></term>
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<listitem><para>After the service process has terminated, keep the service around until it is explicitly
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stopped. This is useful to collect runtime information about the service after it finished running. Also see
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<varname>RemainAfterExit=</varname> in
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--send-sighup</option></term>
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<listitem><para>When terminating the scope or service unit, send a SIGHUP immediately after SIGTERM. This is
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useful to indicate to shells and shell-like processes that the connection has been severed. Also see
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<varname>SendSIGHUP=</varname> in
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<citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--service-type=</option></term>
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<listitem><para>Sets the service type. Also see
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<varname>Type=</varname> in
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>. This
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option has no effect in conjunction with
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<option>--scope</option>. Defaults to
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<constant>simple</constant>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--uid=</option></term>
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<term><option>--gid=</option></term>
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<listitem><para>Runs the service process under the specified UNIX user and group. Also see
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<varname>User=</varname> and <varname>Group=</varname> in
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--nice=</option></term>
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<listitem><para>Runs the service process with the specified
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nice level. Also see <varname>Nice=</varname> in
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-E <replaceable>NAME</replaceable>=<replaceable>VALUE</replaceable></option></term>
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<term><option>--setenv=<replaceable>NAME</replaceable>=<replaceable>VALUE</replaceable></option></term>
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<listitem><para>Runs the service process with the specified environment variable set.
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Also see <varname>Environment=</varname> in
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--pty</option></term>
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<term><option>-t</option></term>
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<listitem><para>When invoking the command, the transient service connects its standard input, output and error
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to the terminal <command>systemd-run</command> is invoked on, via a pseudo TTY device. This allows running
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programs that expect interactive user input/output as services, such as interactive command shells.</para>
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<para>Note that
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<citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<command>shell</command> command is usually a better alternative for requesting a new, interactive login
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session on the local host or a local container.</para>
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<para>See below for details on how this switch combines with <option>--pipe</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--pipe</option></term>
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<term><option>-P</option></term>
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<listitem><para>If specified, standard input, output, and error of the transient service are inherited from the
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<command>systemd-run</command> command itself. This allows <command>systemd-run</command>
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to be used within shell pipelines.
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Note that this mode is not suitable for interactive command shells and similar, as the
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service process will not become a TTY controller when invoked on a terminal. Use <option>--pty</option> instead
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in that case.</para>
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<para>When both <option>--pipe</option> and <option>--pty</option> are used in combination the more appropriate
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option is automatically determined and used. Specifically, when invoked with standard input, output and error
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connected to a TTY <option>--pty</option> is used, and otherwise <option>--pipe</option>.</para>
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<para>When this option is used the original file descriptors <command>systemd-run</command> receives are passed
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to the service processes as-is. If the service runs with different privileges than
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<command>systemd-run</command>, this means the service might not be able to re-open the passed file
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descriptors, due to normal file descriptor access restrictions. If the invoked process is a shell script that
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uses the <command>echo "hello" > /dev/stderr</command> construct for writing messages to stderr, this might
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cause problems, as this only works if stderr can be re-opened. To mitigate this use the construct <command>echo
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"hello" >&2</command> instead, which is mostly equivalent and avoids this pitfall.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--quiet</option></term>
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<term><option>-q</option></term>
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<listitem><para>Suppresses additional informational output
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while running. This is particularly useful in combination with
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<option>--pty</option> when it will suppress the initial
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message explaining how to terminate the TTY connection.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--on-active=</option></term>
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<term><option>--on-boot=</option></term>
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<term><option>--on-startup=</option></term>
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<term><option>--on-unit-active=</option></term>
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<term><option>--on-unit-inactive=</option></term>
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<listitem><para>Defines a monotonic timer relative to different starting points for starting the specified
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command. See <varname>OnActiveSec=</varname>, <varname>OnBootSec=</varname>, <varname>OnStartupSec=</varname>,
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<varname>OnUnitActiveSec=</varname> and <varname>OnUnitInactiveSec=</varname> in
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<citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
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details. These options are shortcuts for <command>--timer-property=</command> with the relevant properties.
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These options may not be combined with <option>--scope</option> or <option>--pty</option>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--on-calendar=</option></term>
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<listitem><para>Defines a calendar timer for starting the specified command. See <varname>OnCalendar=</varname>
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in <citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>. This
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option is a shortcut for <command>--timer-property=OnCalendar=</command>. This option may not be combined with
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<option>--scope</option> or <option>--pty</option>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--path-property=</option></term>
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<term><option>--socket-property=</option></term>
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<term><option>--timer-property=</option></term>
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<listitem><para>Sets a property on the path, socket, or timer unit that is created. This option is similar to
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<option>--property=</option> but applies to the transient path, socket, or timer unit rather than the
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transient service unit created. This option takes an assignment in the same format as
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<command>set-property</command> command. These options may not be combined with
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<option>--scope</option> or <option>--pty</option>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-block</option></term>
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<listitem>
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<para>Do not synchronously wait for the unit start operation to finish. If this option is not specified, the
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start request for the transient unit will be verified, enqueued and <command>systemd-run</command> will wait
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until the unit's start-up is completed. By passing this argument, it is only verified and enqueued. This
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option may not be combined with <option>--wait</option>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--wait</option></term>
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<listitem><para>Synchronously wait for the transient service to terminate. If this option is specified, the
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start request for the transient unit is verified, enqueued, and waited for. Subsequently the invoked unit is
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monitored, and it is waited until it is deactivated again (most likely because the specified command
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completed). On exit, terse information about the unit's runtime is shown, including total runtime (as well as
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CPU usage, if <option>--property=CPUAccounting=1</option> was set) and the exit code and status of the main
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process. This output may be suppressed with <option>--quiet</option>. This option may not be combined with
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<option>--no-block</option>, <option>--scope</option> or the various path, socket, or timer options.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-G</option></term>
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<term><option>--collect</option></term>
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<listitem><para>Unload the transient unit after it completed, even if it failed. Normally, without this option,
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all units that ran and failed are kept in memory until the user explicitly resets their failure state with
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<command>systemctl reset-failed</command> or an equivalent command. On the other hand, units that ran
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successfully are unloaded immediately. If this option is turned on the "garbage collection" of units is more
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aggressive, and unloads units regardless if they exited successfully or failed. This option is a shortcut for
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<command>--property=CollectMode=inactive-or-failed</command>, see the explanation for
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<varname>CollectMode=</varname> in
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for further
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information.</para></listitem>
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</varlistentry>
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<xi:include href="user-system-options.xml" xpointer="user" />
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<xi:include href="user-system-options.xml" xpointer="system" />
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<xi:include href="user-system-options.xml" xpointer="host" />
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<xi:include href="user-system-options.xml" xpointer="machine" />
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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<para>All command line arguments after the first non-option
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argument become part of the command line of the launched
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process. If a command is run as service unit, the first argument
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needs to be an absolute program path.</para>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned, a non-zero failure
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code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<example>
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<title>Logging environment variables provided by systemd to services</title>
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<programlisting># systemd-run env
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Running as unit: run-19945.service
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# journalctl -u run-19945.service
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Sep 08 07:37:21 bupkis systemd[1]: Starting /usr/bin/env...
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Sep 08 07:37:21 bupkis systemd[1]: Started /usr/bin/env.
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Sep 08 07:37:21 bupkis env[19948]: PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
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Sep 08 07:37:21 bupkis env[19948]: LANG=en_US.UTF-8
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Sep 08 07:37:21 bupkis env[19948]: BOOT_IMAGE=/vmlinuz-3.11.0-0.rc5.git6.2.fc20.x86_64</programlisting>
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</example>
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<example>
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<title>Limiting resources available to a command</title>
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<programlisting># systemd-run -p BlockIOWeight=10 updatedb</programlisting>
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<para>This command invokes the
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<citerefentry project='man-pages'><refentrytitle>updatedb</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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tool, but lowers the block I/O weight for it to 10. See
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more information on the <varname>BlockIOWeight=</varname>
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property.</para>
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</example>
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<example>
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<title>Running commands at a specified time</title>
|
|
|
|
<para>The following command will touch a file after 30 seconds.</para>
|
|
|
|
<programlisting># date; systemd-run --on-active=30 --timer-property=AccuracySec=100ms /bin/touch /tmp/foo
|
|
Mon Dec 8 20:44:24 KST 2014
|
|
Running as unit: run-71.timer
|
|
Will run service as unit: run-71.service
|
|
# journalctl -b -u run-71.timer
|
|
-- Logs begin at Fri 2014-12-05 19:09:21 KST, end at Mon 2014-12-08 20:44:54 KST. --
|
|
Dec 08 20:44:38 container systemd[1]: Starting /bin/touch /tmp/foo.
|
|
Dec 08 20:44:38 container systemd[1]: Started /bin/touch /tmp/foo.
|
|
# journalctl -b -u run-71.service
|
|
-- Logs begin at Fri 2014-12-05 19:09:21 KST, end at Mon 2014-12-08 20:44:54 KST. --
|
|
Dec 08 20:44:48 container systemd[1]: Starting /bin/touch /tmp/foo...
|
|
Dec 08 20:44:48 container systemd[1]: Started /bin/touch /tmp/foo.</programlisting>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Allowing access to the tty</title>
|
|
|
|
<para>The following command invokes <filename>/bin/bash</filename> as a service
|
|
passing its standard input, output and error to the calling TTY.</para>
|
|
|
|
<programlisting># systemd-run -t --send-sighup /bin/bash</programlisting>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Start <command>screen</command> as a user service</title>
|
|
|
|
<programlisting>$ systemd-run --scope --user screen
|
|
Running scope as unit run-r14b0047ab6df45bfb45e7786cc839e76.scope.
|
|
|
|
$ screen -ls
|
|
There is a screen on:
|
|
492..laptop (Detached)
|
|
1 Socket in /var/run/screen/S-fatima.
|
|
</programlisting>
|
|
|
|
<para>This starts the <command>screen</command> process as a child of the
|
|
<command>systemd --user</command> process that was started by
|
|
<filename>user@.service</filename>, in a scope unit. A
|
|
<citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
unit is used instead of a
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
unit, because <command>screen</command> will exit when detaching from the terminal,
|
|
and a service unit would be terminated. Running <command>screen</command>
|
|
as a user unit has the advantage that it is not part of the session scope.
|
|
If <varname>KillUserProcesses=yes</varname> is configured in
|
|
<citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
the default, the session scope will be terminated when the user logs
|
|
out of that session.</para>
|
|
|
|
<para>The <filename>user@.service</filename> is started automatically
|
|
when the user first logs in, and stays around as long as at least one
|
|
login session is open. After the user logs out of the last session,
|
|
<filename>user@.service</filename> and all services underneath it
|
|
are terminated. This behavior is the default, when "lingering" is
|
|
not enabled for that user. Enabling lingering means that
|
|
<filename>user@.service</filename> is started automatically during
|
|
boot, even if the user is not logged in, and that the service is
|
|
not terminated when the user logs out.</para>
|
|
|
|
<para>Enabling lingering allows the user to run processes without being logged in,
|
|
for example to allow <command>screen</command> to persist after the user logs out,
|
|
even if the session scope is terminated. In the default configuration, users can
|
|
enable lingering for themselves:</para>
|
|
|
|
<programlisting>$ loginctl enable-linger</programlisting>
|
|
</example>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-mount</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|