mirror of
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450442cf93
This adds "systemd-mount" which is for transient mount and automount units what "systemd-run" is for transient service, scope and timer units. The tool allows establishing mounts and automounts during runtime. It is very similar to the usual /bin/mount commands, but can pull in additional dependenices on access (for example, it pulls in fsck automatically), an take benefit of the automount logic. This tool is particularly useful for mount removable file systems (such as USB sticks), as the automount logic (together with automatic unmount-on-idle), as well as automatic fsck on first access ensure that the removable file system has a high chance to remain in a fully clean state even when it is unplugged abruptly, and returns to a clean state on the next re-plug. This is a follow-up for #2471, as it adds a simple client-side for the transient automount logic added in that PR. In later work it might make sense to invoke this tool automatically from udev rules in order to implement a simpler and safer version of removable media management á la udisks.
461 lines
19 KiB
XML
461 lines
19 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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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 timer-scheduled 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">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
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start a transient <filename>.service</filename> or
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<filename>.scope</filename> unit and run the specified
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<replaceable>COMMAND</replaceable> in it. It may also be used to
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create and start transient <filename>.timer</filename>
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units.</para>
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<para>If a command is run as transient service unit, it will be
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started and managed by the service manager like any other service,
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and thus shows up in the output of <command>systemctl
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list-units</command> like any other unit. It will run in a clean
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and detached execution environment, with the service manager as
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its parent process. In this mode, <command>systemd-run</command>
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will start the service asynchronously in the background and return
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after the command has begun execution.</para>
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<para>If a command is run as transient scope unit, it will be
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started by <command>systemd-run</command> itself as parent process
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and will thus inherit the execution environment of the
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caller. However, the processes of the command are managed by the
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service manager similar to normal services, and will show up in
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the output of <command>systemctl list-units</command>. Execution
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in this case is synchronous, and will return only when the command
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finishes. This mode is enabled via the <option>--scope</option>
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switch (see below). </para>
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<para>If a command is run with timer options such as
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<option>--on-calendar=</option> (see below), a transient timer
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unit is created alongside the service unit for the specified
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command. Only the transient timer unit is started immediately, the
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transient service unit will be started when the transient timer
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elapses. If the <option>--unit=</option> is specified, the
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<replaceable>COMMAND</replaceable> may be omitted. In this case,
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<command>systemd-run</command> only creates a
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<filename>.timer</filename> unit that invokes the specified unit
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when elapsing.</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
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the default transient <filename>.service</filename> unit.
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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 unit property for the scope or service
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unit that is created. This takes an assignment in the same
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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 or scope
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unit. If not specified, the command itself will be used as a
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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
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<filename>.scope</filename> unit part of the specified slice,
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instead of the <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>--remain-after-exit</option></term>
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<listitem><para>After the service or scope process has
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terminated, keep the service around until it is explicitly
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stopped. This is useful to collect runtime information about
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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,
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send a SIGHUP immediately after SIGTERM. This is useful to
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indicate to shells and shell-like processes that the
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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 UNIX user
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and group. Also see <varname>User=</varname> and
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<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 a command, the service connects
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its standard input and output to the invoking tty via a
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pseudo TTY device. This allows invoking binaries as services
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that expect interactive user input, such as interactive
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command shells.</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 monotonic timers relative to different
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starting points. Also see <varname>OnActiveSec=</varname>,
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<varname>OnBootSec=</varname>,
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<varname>OnStartupSec=</varname>,
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<varname>OnUnitActiveSec=</varname> and
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<varname>OnUnitInactiveSec=</varname> in
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<citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>. This
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options have no effect in conjunction with
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<option>--scope</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 realtime (i.e. wallclock) timers with
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calendar event expressions. Also see
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<varname>OnCalendar=</varname> in
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<citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>. This
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option has no effect in conjunction with
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<option>--scope</option>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--timer-property=</option></term>
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<listitem><para>Sets a timer unit property for the timer unit
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that is created. It is similar with
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<option>--property</option> but only for created timer
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unit. This option only has effect in conjunction with
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<option>--on-active=</option>, <option>--on-boot=</option>,
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<option>--on-startup=</option>,
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<option>--on-unit-active=</option>,
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<option>--on-unit-inactive=</option>,
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<option>--on-calendar=</option>. This takes an assignment in
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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> </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 requested operation
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to finish. If this is not specified, the job will be
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verified, enqueued and <command>systemd-run</command> will
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wait until the unit's start-up is completed. By passing this
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argument, it is only verified and enqueued.</para>
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</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, its first argument
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needs to be an absolute binary 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>
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<para>The following command will touch a file after 30 seconds.</para>
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<programlisting># date; systemd-run --on-active=30 --timer-property=AccuracySec=100ms /bin/touch /tmp/foo
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Mon Dec 8 20:44:24 KST 2014
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Running as unit: run-71.timer
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Will run service as unit: run-71.service
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# journalctl -b -u run-71.timer
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-- Logs begin at Fri 2014-12-05 19:09:21 KST, end at Mon 2014-12-08 20:44:54 KST. --
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Dec 08 20:44:38 container systemd[1]: Starting /bin/touch /tmp/foo.
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Dec 08 20:44:38 container systemd[1]: Started /bin/touch /tmp/foo.
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# journalctl -b -u run-71.service
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-- Logs begin at Fri 2014-12-05 19:09:21 KST, end at Mon 2014-12-08 20:44:54 KST. --
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Dec 08 20:44:48 container systemd[1]: Starting /bin/touch /tmp/foo...
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Dec 08 20:44:48 container systemd[1]: Started /bin/touch /tmp/foo.</programlisting>
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</example>
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<example>
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<title>Allowing access to the tty</title>
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<para>The following command invokes <filename>/bin/bash</filename> as a service
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passing its standard input, output and error to the calling TTY.</para>
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<programlisting># systemd-run -t --send-sighup /bin/bash</programlisting>
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</example>
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<example>
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<title>Start <command>screen</command> as a user service</title>
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<programlisting>$ systemd-run --scope --user screen
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Running scope as unit run-r14b0047ab6df45bfb45e7786cc839e76.scope.
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$ screen -ls
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There is a screen on:
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492..laptop (Detached)
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1 Socket in /var/run/screen/S-fatima.
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</programlisting>
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<para>This starts the <command>screen</command> process as a child of the
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<command>systemd --user</command> process that was started by
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<filename>user@.service</filename>, in a scope unit. A
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<citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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unit is used instead of a
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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unit, because <command>screen</command> will exit when detaching from the terminal,
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and a service unit would be terminated. Running <command>screen</command>
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as a user unit has the advantage that it is not part of the session scope.
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If <varname>KillUserProcesses=yes</varname> is configured in
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<citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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the default, the session scope will be terminated when the user logs
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out of that session.</para>
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<para>The <filename>user@.service</filename> is started automatically
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when the user first logs in, and stays around as long as at least one
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login session is open. After the user logs out of the last session,
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<filename>user@.service</filename> and all services underneath it
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are terminated. This behaviour is the default, when "lingering" is
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not enabled for that user. Enabling lingering means that
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<filename>user@.service</filename> is started automatically during
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boot, even if the user is not logged in, and that the service is
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not terminated when the user logs out.</para>
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<para>Enabling lingering allows the user to run processes without being logged in,
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for example to allow <command>screen</command> to persist after the user logs out,
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even if the session scope is terminated. In the default configuration, users can
|
|
enable lingering for themselves:</para>
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|
|
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<programlisting>$ loginctl enable-linger</programlisting>
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</example>
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</refsect1>
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|
|
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<refsect1>
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|
<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>
|