mirror of
https://github.com/systemd/systemd.git
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181 lines
8.1 KiB
XML
181 lines
8.1 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!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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<!--
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-gpt-auto-generator">
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<refentryinfo>
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<title>systemd-gpt-auto-generator</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-gpt-auto-generator</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-gpt-auto-generator</refname>
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<refpurpose>Generator for automatically discovering
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and mounting root, <filename>/home</filename> and
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<filename>/srv</filename> partitions, as well as
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discovering and enabling swap partitions, based on GPT
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partition type GUIDs.</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/usr/lib/systemd/system-generators/systemd-gpt-auto-generator</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-gpt-auto-generator</filename> is a unit
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generator that automatically discovers root,
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<filename>/home</filename>, <filename>/srv</filename> and swap
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partitions and creates mount and swap units for them, based on the
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partition type GUIDs of GUID partition tables (GPT). It implements
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the
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<ulink url="http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/">Discoverable
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Partitions Specification</ulink>. Note that this generator has no
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effect on non-GPT systems, on systems where the units are
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explicitly configured (for example, listed in
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<citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>),
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or where the mount points are non-empty.</para>
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<para>This generator will only look for root partitions on the
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same physical disk the EFI System Partition (ESP) is located on.
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It will only look for the other partitions on the same physical
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disk the root file system is located on. These partitions will not
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be searched on systems where the root file system is distributed
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on multiple disks, for example via btrfs RAID.</para>
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<para><filename>systemd-gpt-auto-generator</filename> is useful
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for centralizing file system configuration in the partition table
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and making manual configuration in <filename>/etc/fstab</filename>
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or suchlike unnecessary.</para>
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<para>This generator looks for the partitions based on their
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partition type GUID. The following partition type GUIDs are
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identified:</para>
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<table>
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<title>Partition Type GUIDs</title>
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<tgroup cols='3' align='left' colsep='1' rowsep='1'>
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<colspec colname="guid" />
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<colspec colname="name" />
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<colspec colname="explanation" />
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<thead>
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<row>
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<entry>Partition Type GUID</entry>
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<entry>Name</entry>
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<entry>Explanation</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>44479540-f297-41b2-9af7-d131d5f0458a</entry>
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<entry><filename>Root Partition (x86)</filename></entry>
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<entry>On 32-bit x86 systems, the first x86 root partition on the disk the EFI ESP is located on is mounted to the root directory <filename>/</filename>.</entry>
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</row>
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<row>
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<entry>4f68bce3-e8cd-4db1-96e7-fbcaf984b709</entry>
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<entry><filename>Root Partition (x86-64)</filename></entry>
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<entry>On 64-bit x86 systems, the first x86-64 root partition on the disk the EFI ESP is located on is mounted to the root directory <filename>/</filename>.</entry>
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</row>
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<row>
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<entry>69dad710-2ce4-4e3c-b16c-21a1d49abed3</entry>
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<entry><filename>Root Partition (32-bit ARM)</filename></entry>
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<entry>On 32-bit ARM systems, the first ARM root partition on the disk the EFI ESP is located on is mounted to the root directory <filename>/</filename>.</entry>
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</row>
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<row>
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<entry>b921b045-1df0-41c3-af44-4c6f280d3fae</entry>
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<entry><filename>Root Partition (64-bit ARM)</filename></entry>
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<entry>On 64-bit ARM systems, the first ARM root partition on the disk the EFI ESP is located on is mounted to the root directory <filename>/</filename>.</entry>
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</row>
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<row>
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<entry>933ac7e1-2eb4-4f13-b844-0e14e2aef915</entry>
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<entry>Home Partition</entry>
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<entry>The first home partition on the disk the root partition is located on is mounted to <filename>/home</filename>.</entry>
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</row>
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<row>
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<entry>3b8f8425-20e0-4f3b-907f-1a25a76f98e8</entry>
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<entry>Server Data Partition</entry>
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<entry>The first server data partition on the disk the root partition is located on is mounted to <filename>/srv</filename>.</entry>
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</row>
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<row>
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<entry>0657fd6d-a4ab-43c4-84e5-0933c84b4f4f</entry>
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<entry>Swap</entry>
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<entry>All swap partitions located on the disk the root partition is located on are enabled.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>The <filename>/home</filename> and <filename>/srv</filename>
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partitions may be encrypted in LUKS format. In this case a device
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mapper device is set up under the names
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<filename>/dev/mapper/home</filename> and
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<filename>/dev/mapper/srv</filename>. Note that this might create
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conflicts if the same partition is listed in
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<filename>/etc/crypttab</filename> with a different device mapper
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device name.</para>
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<para>Also note that
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<citerefentry><refentrytitle>systemd-efi-boot-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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will mount the EFI System Partition (ESP) to
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<filename>/boot</filename> if not otherwise mounted.</para>
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<para>When using this generator in conjunction with btrfs file
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systems, make sure to set the correct default subvolumes on them,
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using <command>btrfs subvolume set-default</command>.</para>
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<para><filename>systemd-gpt-auto-generator</filename> implements
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the
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<ulink url="http://www.freedesktop.org/wiki/Software/systemd/Generators">Generator
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Specification</ulink>.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.swap</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-efi-boot-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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