summaryrefslogtreecommitdiff
path: root/src/systemd-cryptsetup/systemd-cryptsetup-generator.xml
blob: f036ab974461ca27749ef57729fc7fd60f8273e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
  This file is part of systemd.

  Copyright 2012 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refentry id="systemd-cryptsetup-generator" conditional='HAVE_LIBCRYPTSETUP'>

  <refentryinfo>
    <title>systemd-cryptsetup-generator</title>
    <productname>systemd</productname>

    <authorgroup>
      <author>
        <contrib>Developer</contrib>
        <firstname>Lennart</firstname>
        <surname>Poettering</surname>
        <email>lennart@poettering.net</email>
      </author>
    </authorgroup>
  </refentryinfo>

  <refmeta>
    <refentrytitle>systemd-cryptsetup-generator</refentrytitle>
    <manvolnum>8</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>systemd-cryptsetup-generator</refname>
    <refpurpose>Unit generator for <filename>/etc/crypttab</filename></refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <para><filename>/usr/lib/systemd/system-generators/systemd-cryptsetup-generator</filename></para>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><filename>systemd-cryptsetup-generator</filename> is a
    generator that translates <filename>/etc/crypttab</filename> into
    native systemd units early at boot and when configuration of the
    system manager is reloaded. This will create
    <citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
    units as necessary.</para>

    <para><filename>systemd-cryptsetup-generator</filename> implements
    <citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
  </refsect1>

  <refsect1>
    <title>Kernel Command Line</title>

    <para><filename>systemd-cryptsetup-generator</filename>
    understands the following kernel command line parameters:</para>

    <variablelist class='kernel-commandline-options'>
      <varlistentry>
        <term><varname>luks=</varname></term>
        <term><varname>rd.luks=</varname></term>

        <listitem><para>Takes a boolean argument. Defaults to
        <literal>yes</literal>. If <literal>no</literal>, disables the
        generator entirely. <varname>rd.luks=</varname> is honored
        only by initial RAM disk (initrd) while
        <varname>luks=</varname> is honored by both the main system
        and the initrd. </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>luks.crypttab=</varname></term>
        <term><varname>rd.luks.crypttab=</varname></term>

        <listitem><para>Takes a boolean argument. Defaults to
        <literal>yes</literal>. If <literal>no</literal>, causes the
        generator to ignore any devices configured in
        <filename>/etc/crypttab</filename>
        (<varname>luks.uuid=</varname> will still work however).
        <varname>rd.luks.crypttab=</varname> is honored only by
        initial RAM disk (initrd) while
        <varname>luks.crypttab=</varname> is honored by both the main
        system and the initrd. </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>luks.uuid=</varname></term>
        <term><varname>rd.luks.uuid=</varname></term>

        <listitem><para>Takes a LUKS superblock UUID as argument. This
        will activate the specified device as part of the boot process
        as if it was listed in <filename>/etc/crypttab</filename>.
        This option may be specified more than once in order to set up
        multiple devices. <varname>rd.luks.uuid=</varname> is honored
        only by initial RAM disk (initrd) while
        <varname>luks.uuid=</varname> is honored by both the main
        system and the initrd.</para>
        <para>If /etc/crypttab contains entries with the same UUID,
        then the name, keyfile and options specified there will be
        used. Otherwise, the device will have the name
        <literal>luks-UUID</literal>.</para>
        <para>If /etc/crypttab exists, only those UUIDs
        specified on the kernel command line
        will be activated in the initrd or the real root.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>luks.name=</varname></term>
        <term><varname>rd.luks.name=</varname></term>

        <listitem><para>Takes a LUKS super block UUID followed by an
        <literal>=</literal> and a name. This implies
        <varname>rd.luks.uuid=</varname> or
        <varname>luks.uuid=</varname> and will additionally make the
        LUKS device given by the UUID appear under the provided
        name.</para>

        <para><varname>rd.luks.name=</varname> is honored only by
        initial RAM disk (initrd) while <varname>luks.name=</varname>
        is honored by both the main system and the initrd.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>luks.options=</varname></term>
        <term><varname>rd.luks.options=</varname></term>

        <listitem><para>Takes a LUKS super block UUID followed by an
        <literal>=</literal> and a string of options separated by
        commas as argument. This will override the options for the
        given UUID.</para>
        <para>If only a list of options, without an UUID, is
        specified, they apply to any UUIDs not specified elsewhere,
        and without an entry in
        <filename>/etc/crypttab</filename>.</para><para>
        <varname>rd.luks.options=</varname> is honored only by initial
        RAM disk (initrd) while <varname>luks.options=</varname> is
        honored by both the main system and the initrd.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>luks.key=</varname></term>
        <term><varname>rd.luks.key=</varname></term>

        <listitem><para>Takes a password file name as argument or a
        LUKS super block UUID followed by a <literal>=</literal> and a
        password file name.</para>

        <para>For those entries specified with
        <varname>rd.luks.uuid=</varname> or
        <varname>luks.uuid=</varname>, the password file will be set
        to the one specified by <varname>rd.luks.key=</varname> or
        <varname>luks.key=</varname> of the corresponding UUID, or the
        password file that was specified without a UUID.</para>
        <para><varname>rd.luks.key=</varname>
        is honored only by initial RAM disk
        (initrd) while
        <varname>luks.key=</varname> is
        honored by both the main system and
        the initrd.</para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>See Also</title>
    <para>
      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
      <citerefentry project='die-net'><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>