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1 | <?xml version="1.0"?> |
2 | <!--*-nxml-*--> | |
3 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" | |
eea10b26 | 4 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd"> |
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5 | <!-- SPDX-License-Identifier: LGPL-2.1-or-later --> |
6 | <refentry id="systemd-storagetm.service" conditional='ENABLE_STORAGETM' | |
7 | xmlns:xi="http://www.w3.org/2001/XInclude"> | |
8 | ||
9 | <refentryinfo> | |
10 | <title>systemd-storagetm.service</title> | |
11 | <productname>systemd</productname> | |
12 | </refentryinfo> | |
13 | ||
14 | <refmeta> | |
15 | <refentrytitle>systemd-storagetm.service</refentrytitle> | |
16 | <manvolnum>8</manvolnum> | |
17 | </refmeta> | |
18 | ||
19 | <refnamediv> | |
20 | <refname>systemd-storagetm.service</refname> | |
21 | <refname>systemd-storagetm</refname> | |
22 | <refpurpose>Exposes all local block devices as NVMe-TCP mass storage devices</refpurpose> | |
23 | </refnamediv> | |
24 | ||
25 | <refsynopsisdiv> | |
26 | <para><filename>systemd-storagetm.service</filename></para> | |
27 | ||
28 | <cmdsynopsis> | |
29 | <command>/usr/lib/systemd/systemd-storagetm</command> | |
30 | <arg choice="opt" rep="repeat">OPTIONS</arg> | |
31 | <arg choice="opt"><replaceable>DEVICE</replaceable></arg> | |
32 | </cmdsynopsis> | |
33 | </refsynopsisdiv> | |
34 | ||
35 | <refsect1> | |
36 | <title>Description</title> | |
37 | ||
38 | <para><filename>systemd-storagetm.service</filename> is a service that exposes all local block devices as | |
39 | NVMe-TCP mass storage devices. Its primary use-case is to be invoked by the | |
40 | <filename>storage-target-mode.target</filename> unit that can be booted into.</para> | |
41 | ||
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42 | <warning> |
43 | <para>The NVMe disks are currently exposed without authentication or encryption, in read/write | |
44 | mode. This means network peers may read from and write to the device without any restrictions. This | |
45 | functionality should hence only be used in a local setup.</para> | |
46 | </warning> | |
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47 | |
48 | <para>Note that to function properly networking must be configured too. The recommended mechanism to boot | |
49 | into a storage target mode is by adding <literal>rd.systemd.unit=storage-target-mode.target | |
50 | ip=link-local</literal> on the kernel command line. Note that <literal>ip=link-local</literal> only | |
51 | configures link-local IP, i.e. IPv4LL and IPv6LL, which means non-routable addresses. This is done for | |
52 | security reasons, so that only systems on the local link can access the devices. Use | |
53 | <literal>ip=dhcp</literal> to assign routable addresses too. For further details see | |
54 | <citerefentry><refentrytitle>systemd-network-generator.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
55 | ||
56 | <para>Unless the <option>--all</option> switch is used expects one or more block devices or regular files to expose | |
57 | via NVMe-TCP as argument.</para> | |
58 | </refsect1> | |
59 | ||
60 | <refsect1> | |
61 | <title>Options</title> | |
62 | ||
63 | <para>The following options are understood:</para> | |
64 | ||
65 | <variablelist> | |
66 | <varlistentry> | |
67 | <term><option>--nqn=</option></term> | |
68 | <listitem><para>Takes a string. If specified configures the NVMe Qualified Name to use for the | |
69 | exposed NVMe-TCP mass storage devices. The NQN should follow the syntax described in <ulink | |
70 | url="https://nvmexpress.org/wp-content/uploads/NVM-Express-Base-Specification-2.0c-2022.10.04-Ratified.pdf">NVM | |
71 | Express Base Specification 2.0c</ulink>, section 4.5 "NVMe Qualified Names". Note that the NQN | |
72 | specified here will be suffixed with a dot and the the block device name before it is exposed on the | |
73 | NVMe target. If not specified defaults to | |
74 | <literal>nqn.2023-10.io.systemd:storagetm.<replaceable>ID</replaceable></literal>, where ID is | |
75 | replaced by a 128bit ID derived from | |
76 | <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
77 | ||
78 | <xi:include href="version-info.xml" xpointer="v255"/></listitem> | |
79 | </varlistentry> | |
80 | ||
81 | <varlistentry> | |
82 | <term><option>--all</option></term> | |
83 | <term><option>-a</option></term> | |
84 | ||
85 | <listitem><para>If specified exposes all local block devices via NVMe-TCP, current and future | |
86 | (i.e. it watches block devices come and go and updates the NVMe-TCP list as needed). Note that by | |
87 | default any block devices that originate on the same block device as the block device backing the | |
88 | current root file system are excluded. If the switch is specified twice this safety mechanism is | |
89 | disabled.</para> | |
90 | ||
91 | <xi:include href="version-info.xml" xpointer="v255"/></listitem> | |
92 | </varlistentry> | |
93 | <xi:include href="standard-options.xml" xpointer="help" /> | |
94 | <xi:include href="standard-options.xml" xpointer="version" /> | |
95 | </variablelist> | |
96 | </refsect1> | |
97 | ||
98 | <refsect1> | |
99 | <title>See Also</title> | |
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100 | <para><simplelist type="inline"> |
101 | <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member> | |
102 | <member><citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry></member> | |
103 | </simplelist></para> | |
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104 | </refsect1> |
105 | ||
106 | </refentry> |