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118 lines
5.2 KiB
XML
118 lines
5.2 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-storagetm.service" conditional='ENABLE_STORAGETM'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-storagetm.service</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-storagetm.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-storagetm.service</refname>
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<refname>systemd-storagetm</refname>
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<refpurpose>Exposes all local block devices as NVMe-TCP mass storage devices</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-storagetm.service</filename></para>
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<cmdsynopsis>
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<command>/usr/lib/systemd/systemd-storagetm</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt"><replaceable>DEVICE</replaceable></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><filename>systemd-storagetm.service</filename> is a service that exposes all local block devices as
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NVMe-TCP mass storage devices. Its primary use-case is to be invoked by the
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<filename>storage-target-mode.target</filename> unit that can be booted into.</para>
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<warning>
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<para>The NVMe disks are currently exposed without authentication or encryption, in read/write
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mode. This means network peers may read from and write to the device without any restrictions. This
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functionality should hence only be used in a local setup.</para>
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</warning>
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<para>Note that to function properly networking must be configured too. The recommended mechanism to boot
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into a storage target mode is by adding <literal>rd.systemd.unit=storage-target-mode.target
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ip=link-local</literal> on the kernel command line. Note that <literal>ip=link-local</literal> only
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configures link-local IP, i.e. IPv4LL and IPv6LL, which means non-routable addresses. This is done for
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security reasons, so that only systems on the local link can access the devices. Use
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<literal>ip=dhcp</literal> to assign routable addresses too. For further details see
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<citerefentry><refentrytitle>systemd-network-generator.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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<para>Unless the <option>--all</option> switch is used expects one or more block devices or regular files to expose
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via NVMe-TCP as argument.</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>--nqn=</option></term>
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<listitem><para>Takes a string. If specified configures the NVMe Qualified Name to use for the
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exposed NVMe-TCP mass storage devices. The NQN should follow the syntax described in <ulink
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url="https://nvmexpress.org/wp-content/uploads/NVM-Express-Base-Specification-2.0c-2022.10.04-Ratified.pdf">NVM
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Express Base Specification 2.0c</ulink>, section 4.5 "NVMe Qualified Names". Note that the NQN
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specified here will be suffixed with a dot and the block device name before it is exposed on the
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NVMe target. If not specified defaults to
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<literal>nqn.2023-10.io.systemd:storagetm.<replaceable>ID</replaceable></literal>, where ID is
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replaced by a 128bit ID derived from
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<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--all</option></term>
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<term><option>-a</option></term>
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<listitem><para>If specified exposes all local block devices via NVMe-TCP, current and future
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(i.e. it watches block devices come and go and updates the NVMe-TCP list as needed). Note that by
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default any block devices that originate on the same block device as the block device backing the
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current root file system are excluded. If the switch is specified twice this safety mechanism is
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disabled.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--list-devices</option></term>
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<listitem><para>Show a list of candidate block devices this command may operate on. Specifically,
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this enumerates block devices currently present, and shows their device node paths along with any of
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their symlinks.</para>
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<xi:include href="version-info.xml" xpointer="v257"/></listitem>
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</varlistentry>
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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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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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