mirror of
https://github.com/systemd/systemd.git
synced 2024-11-30 13:53:39 +08:00
240 lines
12 KiB
XML
240 lines
12 KiB
XML
<?xml version="1.0"?>
|
|
<!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
<refentry id="systemd-cryptsetup-generator" conditional='HAVE_LIBCRYPTSETUP'
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>systemd-cryptsetup-generator</title>
|
|
<productname>systemd</productname>
|
|
</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
|
|
in the initrd while <varname>luks=</varname> is honored by both the main system and in the initrd.
|
|
</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v186"/></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 in initrd while
|
|
<varname>luks.crypttab=</varname> is honored by both the main system and in the initrd.
|
|
</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v186"/></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 in the initrd, while <varname>luks.uuid=</varname> is honored by both the main system
|
|
and in the initrd.</para>
|
|
|
|
<para>If <filename>/etc/crypttab</filename> 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 <filename>/etc/crypttab</filename> exists, only those UUIDs specified on the kernel command
|
|
line will be activated in the initrd or the real root.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v186"/>
|
|
</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>This parameter is the analogue of the first <citerefentry><refentrytitle>crypttab</refentrytitle>
|
|
<manvolnum>5</manvolnum></citerefentry> field <replaceable>volume-name</replaceable>.</para>
|
|
|
|
<para><varname>rd.luks.name=</varname> is honored only in the initrd, while
|
|
<varname>luks.name=</varname> is honored by both the main system and in the initrd.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v218"/>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>luks.data=</varname></term>
|
|
<term><varname>rd.luks.data=</varname></term>
|
|
|
|
<listitem><para>Takes a LUKS super block UUID followed by a <literal>=</literal> and a block device
|
|
specification for device hosting encrypted data.</para>
|
|
|
|
<para>For those entries specified with <varname>rd.luks.uuid=</varname> or
|
|
<varname>luks.uuid=</varname>, the data device will be set to the one specified by
|
|
<varname>rd.luks.data=</varname> or <varname>luks.data=</varname> of the corresponding UUID.</para>
|
|
|
|
<para>LUKS data device parameter is useful for specifying encrypted data devices with detached headers specified in
|
|
<varname>luks.options</varname> entry containing <literal>header=</literal> argument. For example,
|
|
<varname>rd.luks.uuid=</varname>b40f1abf-2a53-400a-889a-2eccc27eaa40
|
|
<varname>rd.luks.options=</varname>b40f1abf-2a53-400a-889a-2eccc27eaa40=header=/path/to/luks.hdr
|
|
<varname>rd.luks.data=</varname>b40f1abf-2a53-400a-889a-2eccc27eaa40=/dev/sdx.
|
|
Hence, in this case, we will attempt to unlock LUKS device assembled from data device <literal>/dev/sdx</literal>
|
|
and LUKS header (metadata) put in <literal>/path/to/luks.hdr</literal> file. This syntax is for now
|
|
only supported on a per-device basis, i.e. you have to specify LUKS device UUID.</para>
|
|
|
|
<para>This parameter is the analogue of the second <citerefentry><refentrytitle>crypttab</refentrytitle>
|
|
<manvolnum>5</manvolnum></citerefentry> field <replaceable>encrypted-device</replaceable>.</para>
|
|
|
|
<para><varname>rd.luks.data=</varname> is honored only in the initrd, while
|
|
<varname>luks.data=</varname> is honored by both the main system and in the initrd.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v247"/>
|
|
</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>It is also possible to specify an external device which
|
|
should be mounted before we attempt to unlock the LUKS device.
|
|
systemd-cryptsetup will use password file stored on that
|
|
device. Device containing password file is specified by
|
|
appending colon and a device identifier to the password file
|
|
path. For example,
|
|
<varname>rd.luks.uuid=</varname>b40f1abf-2a53-400a-889a-2eccc27eaa40
|
|
<varname>rd.luks.key=</varname>b40f1abf-2a53-400a-889a-2eccc27eaa40=/keyfile:LABEL=keydev.
|
|
Hence, in this case, we will attempt to mount file system
|
|
residing on the block device with label <literal>keydev</literal>.
|
|
This syntax is for now only supported on a per-device basis,
|
|
i.e. you have to specify LUKS device UUID.</para>
|
|
|
|
<para>This parameter is the analogue of the third <citerefentry><refentrytitle>crypttab</refentrytitle>
|
|
<manvolnum>5</manvolnum></citerefentry> field <replaceable>key-file</replaceable>.</para>
|
|
|
|
<para><varname>rd.luks.key=</varname> is honored only in the initrd, while
|
|
<varname>luks.key=</varname> is honored by both the main system and in the initrd.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v202"/>
|
|
</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 a UUID, is
|
|
specified, they apply to any UUIDs not specified elsewhere,
|
|
and without an entry in
|
|
<filename>/etc/crypttab</filename>.</para>
|
|
|
|
<para>This parameter is the analogue of the fourth <citerefentry><refentrytitle>crypttab</refentrytitle>
|
|
<manvolnum>5</manvolnum></citerefentry> field <replaceable>options</replaceable>.</para>
|
|
|
|
<para>It is possible to specify an external device which
|
|
should be mounted before we attempt to unlock the LUKS device.
|
|
systemd-cryptsetup will assemble LUKS device by combining
|
|
data device specified in <varname>luks.data</varname> with
|
|
detached LUKS header found in <literal>header=</literal>
|
|
argument. For example,
|
|
<varname>rd.luks.uuid=</varname>b40f1abf-2a53-400a-889a-2eccc27eaa40
|
|
<varname>rd.luks.options=</varname>b40f1abf-2a53-400a-889a-2eccc27eaa40=header=/luks.hdr:LABEL=hdrdev
|
|
<varname>rd.luks.data=</varname>b40f1abf-2a53-400a-889a-2eccc27eaa40=/dev/sdx.
|
|
Hence, in this case, we will attempt to mount file system
|
|
residing on the block device with label <literal>hdrdev</literal>, and look
|
|
for <literal>luks.hdr</literal> on that file system. Said header will be used
|
|
to unlock (decrypt) encrypted data stored on /dev/sdx.
|
|
This syntax is for now only supported on a per-device basis,
|
|
i.e. you have to specify LUKS device UUID.</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 in the initrd.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v208"/>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para><simplelist type="inline">
|
|
<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-cryptenroll</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
<member><citerefentry project='die-net'><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
</simplelist></para>
|
|
</refsect1>
|
|
|
|
</refentry>
|