man/systemd-cryptsetup-generator.xml

   1 <?xml version="1.0"?>
   2 <!--*-nxml-*-->
   3 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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   7   Copyright 2012 Lennart Poettering
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  22 <refentry id="systemd-cryptsetup-generator" conditional='HAVE_LIBCRYPTSETUP'>
  23
  24         <refentryinfo>
  25                 <title>systemd-cryptsetup-generator</title>
  26                 <productname>systemd</productname>
  27
  28                 <authorgroup>
  29                         <author>
  30                                 <contrib>Developer</contrib>
  31                                 <firstname>Lennart</firstname>
  32                                 <surname>Poettering</surname>
  33                                 <email>lennart@poettering.net</email>
  34                         </author>
  35                 </authorgroup>
  36         </refentryinfo>
  37
  38         <refmeta>
  39                 <refentrytitle>systemd-cryptsetup-generator</refentrytitle>
  40                 <manvolnum>8</manvolnum>
  41         </refmeta>
  42
  43         <refnamediv>
  44                 <refname>systemd-cryptsetup-generator</refname>
  45                 <refpurpose>Unit generator for <filename>/etc/crypttab</filename></refpurpose>
  46         </refnamediv>
  47
  48         <refsynopsisdiv>
  49                 <para><filename>/usr/lib/systemd/system-generators/systemd-cryptsetup-generator</filename></para>
  50         </refsynopsisdiv>
  51
  52         <refsect1>
  53                 <title>Description</title>
  54
  55                 <para><filename>systemd-cryptsetup-generator</filename>
  56                 is a generator that translates
  57                 <filename>/etc/crypttab</filename> into native systemd
  58                 units early at boot and when configuration of the
  59                 system manager is reloaded. This will create
  60                 <citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  61                 units as necessary.</para>
  62
  63                 <para><filename>systemd-cryptsetup-generator</filename>
  64                 implements the <ulink
  65                 url="http://www.freedesktop.org/wiki/Software/systemd/Generators">generator
  66                 specification</ulink>.</para>
  67         </refsect1>
  68
  69         <refsect1>
  70                 <title>Kernel Command Line</title>
  71
  72                 <para><filename>systemd-cryptsetup-generator</filename> understands
  73                 the following kernel command line parameters:</para>
  74
  75                 <variablelist class='kernel-commandline-options'>
  76                         <varlistentry>
  77                                 <term><varname>luks=</varname></term>
  78                                 <term><varname>rd.luks=</varname></term>
  79
  80                                 <listitem><para>Takes a boolean
  81                                 argument. Defaults to
  82                                 <literal>yes</literal>. If
  83                                 <literal>no</literal>, disables the
  84                                 generator
  85                                 entirely. <varname>rd.luks=</varname>
  86                                 is honored only by initial RAM disk
  87                                 (initrd) while
  88                                 <varname>luks=</varname> is honored
  89                                 by both the main system and the
  90                                 initrd.  </para></listitem>
  91                         </varlistentry>
  92
  93                         <varlistentry>
  94                                 <term><varname>luks.crypttab=</varname></term>
  95                                 <term><varname>rd.luks.crypttab=</varname></term>
  96
  97                                 <listitem><para>Takes a boolean
  98                                 argument. Defaults to
  99                                 <literal>yes</literal>. If
 100                                 <literal>no</literal>, causes the
 101                                 generator to ignore any devices
 102                                 configured in
 103                                 <filename>/etc/crypttab</filename>
 104                                 (<varname>luks.uuid=</varname> will
 105                                 still work
 106                                 however). <varname>rd.luks.crypttab=</varname>
 107                                 is honored only by initial RAM disk
 108                                 (initrd) while
 109                                 <varname>luks.crypttab=</varname> is
 110                                 honored by both the main system and
 111                                 the initrd.  </para></listitem>
 112                         </varlistentry>
 113
 114                         <varlistentry>
 115                                 <term><varname>luks.uuid=</varname></term>
 116                                 <term><varname>rd.luks.uuid=</varname></term>
 117
 118                                 <listitem><para>Takes a LUKS superblock
 119                                 UUID as argument. This will
 120                                 activate the specified device as part
 121                                 of the boot process as if it was
 122                                 listed in
 123                                 <filename>/etc/fstab</filename>. This
 124                                 option may be specified more than once
 125                                 in order to set up multiple
 126                                 devices. <varname>rd.luks.uuid=</varname>
 127                                 is honored only by initial RAM disk
 128                                 (initrd) while
 129                                 <varname>luks.uuid=</varname> is
 130                                 honored by both the main system and
 131                                 the initrd.</para>
 132                                 <para>If /etc/crypttab contains entries with
 133                                 the same UUID, then the options for this entry
 134                                 will be used.</para>
 135                                 <para>If /etc/crypttab exists, only those UUID
 136                                 specified on the kernel command line
 137                                 will be activated in the initrd or the real root.</para>
 138                                 </listitem>
 139                         </varlistentry>
 140
 141                         <varlistentry>
 142                                 <term><varname>luks.options=</varname></term>
 143                                 <term><varname>rd.luks.options=</varname></term>
 144
 145                                 <listitem><para>Takes a LUKS super
 146                                 block UUID followed by an '=' and a string
 147                                 of options separated by commas as argument.
 148                                 This will override the options for the given
 149                                 UUID.</para>
 150                                 <para>If only a list of options, without an
 151                                 UUID, is specified, they apply to any UUIDs not
 152                                 specified elsewhere, and without an entry in
 153                                 /etc/crypttab.</para><para>
 154                                 <varname>rd.luks.options=</varname>
 155                                 is honored only by initial RAM disk
 156                                 (initrd) while
 157                                 <varname>luks.options=</varname> is
 158                                 honored by both the main system and
 159                                 the initrd.</para>
 160                                 </listitem>
 161                         </varlistentry>
 162
 163                         <varlistentry>
 164                                 <term><varname>luks.key=</varname></term>
 165                                 <term><varname>rd.luks.key=</varname></term>
 166
 167                                 <listitem><para>Takes a password file as argument.</para>
 168                                 <para>For those entries specified with
 169                                 <varname>rd.luks.uuid=</varname> or <varname>luks.uuid=</varname>,
 170                                 the password file will be set to the password file specified by
 171                                 <varname>rd.luks.key=</varname> or <varname>luks.key</varname></para>
 172                                 <para><varname>rd.luks.key=</varname>
 173                                 is honored only by initial RAM disk
 174                                 (initrd) while
 175                                 <varname>luks.key=</varname> is
 176                                 honored by both the main system and
 177                                 the initrd.</para>
 178                                 </listitem>
 179                         </varlistentry>
 180                 </variablelist>
 181         </refsect1>
 182
 183         <refsect1>
 184                 <title>See Also</title>
 185                 <para>
 186                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 187                         <citerefentry><refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 188                         <citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 189                         <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 190                         <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 191                 </para>
 192         </refsect1>
 193
 194 </refentry>