NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | NOTES | COLOPHON

SYSTEMD-GPT-AUTO-GENERATOR(8)emd-gpt-auto-generatorEMD-GPT-AUTO-GENERATOR(8)

NAME         top

       systemd-gpt-auto-generator - Generator for automatically discovering
       and mounting root, /home and /srv partitions, as well as discovering
       and enabling swap partitions, based on GPT partition type GUIDs.

SYNOPSIS         top

       /usr/lib/systemd/system-generators/systemd-gpt-auto-generator

DESCRIPTION         top

       systemd-gpt-auto-generator is a unit generator that automatically
       discovers root, /home, /srv and swap partitions and creates mount and
       swap units for them, based on the partition type GUIDs of GUID
       partition tables (GPT). It implements the Discoverable Partitions
       Specification[1]. Note that this generator has no effect on non-GPT
       systems, or where the directories under the mount points are already
       non-empty. Also, on systems where the units are explicitly configured
       (for example, listed in fstab(5)), the units this generator creates
       are overridden, but additional automatic dependencies might be
       created.

       This generator will only look for root partitions on the same
       physical disk the EFI System Partition (ESP) is located on. It will
       only look for the other partitions on the same physical disk the root
       file system is located on. These partitions will not be searched on
       systems where the root file system is distributed on multiple disks,
       for example via btrfs RAID.

       systemd-gpt-auto-generator is useful for centralizing file system
       configuration in the partition table and making manual configuration
       in /etc/fstab or suchlike unnecessary.

       This generator looks for the partitions based on their partition type
       GUID. The following partition type GUIDs are identified:

       Table 1. Partition Type GUIDs
       ┌─────────────────────────────────────┬─────────────────┬─────────────────────┐
       │Partition Type GUID                  Name            Explanation         │
       ├─────────────────────────────────────┼─────────────────┼─────────────────────┤
       │44479540-f297-41b2-9af7-d131d5f0458a │ Root Partition  │ On 32-bit x86       │
       │                                     │ (x86)           │ systems, the first  │
       │                                     │                 │ x86 root partition  │
       │                                     │                 │ on the disk the EFI │
       │                                     │                 │ ESP is located on   │
       │                                     │                 │ is mounted to the   │
       │                                     │                 │ root directory /.   │
       ├─────────────────────────────────────┼─────────────────┼─────────────────────┤
       │4f68bce3-e8cd-4db1-96e7-fbcaf984b709 │ Root Partition  │ On 64-bit x86       │
       │                                     │ (x86-64)        │ systems, the first  │
       │                                     │                 │ x86-64 root         │
       │                                     │                 │ partition on the    │
       │                                     │                 │ disk the EFI ESP is │
       │                                     │                 │ located on is       │
       │                                     │                 │ mounted to the root │
       │                                     │                 │ directory /.        │
       ├─────────────────────────────────────┼─────────────────┼─────────────────────┤
       │69dad710-2ce4-4e3c-b16c-21a1d49abed3 │ Root Partition  │ On 32-bit ARM       │
       │                                     │ (32-bit ARM)    │ systems, the first  │
       │                                     │                 │ ARM root partition  │
       │                                     │                 │ on the disk the EFI │
       │                                     │                 │ ESP is located on   │
       │                                     │                 │ is mounted to the   │
       │                                     │                 │ root directory /.   │
       ├─────────────────────────────────────┼─────────────────┼─────────────────────┤
       │b921b045-1df0-41c3-af44-4c6f280d3fae │ Root Partition  │ On 64-bit ARM       │
       │                                     │ (64-bit ARM)    │ systems, the first  │
       │                                     │                 │ ARM root partition  │
       │                                     │                 │ on the disk the EFI │
       │                                     │                 │ ESP is located on   │
       │                                     │                 │ is mounted to the   │
       │                                     │                 │ root directory /.   │
       ├─────────────────────────────────────┼─────────────────┼─────────────────────┤
       │933ac7e1-2eb4-4f13-b844-0e14e2aef915 │ Home Partition  │ The first home      │
       │                                     │                 │ partition on the    │
       │                                     │                 │ disk the root       │
       │                                     │                 │ partition is        │
       │                                     │                 │ located on is       │
       │                                     │                 │ mounted to /home.   │
       ├─────────────────────────────────────┼─────────────────┼─────────────────────┤
       │3b8f8425-20e0-4f3b-907f-1a25a76f98e8 │ Server Data     │ The first server    │
       │                                     │ Partition       │ data partition on   │
       │                                     │                 │ the disk the root   │
       │                                     │                 │ partition is        │
       │                                     │                 │ located on is       │
       │                                     │                 │ mounted to /srv.    │
       ├─────────────────────────────────────┼─────────────────┼─────────────────────┤
       │0657fd6d-a4ab-43c4-84e5-0933c84b4f4f │ Swap            │ All swap partitions │
       │                                     │                 │ located on the disk │
       │                                     │                 │ the root partition  │
       │                                     │                 │ is located on are   │
       │                                     │                 │ enabled.            │
       ├─────────────────────────────────────┼─────────────────┼─────────────────────┤
       │c12a7328-f81f-11d2-ba4b-00a0c93ec93b │ EFI System      │ The first ESP       │
       │                                     │ Partition (ESP) │ located on the disk │
       │                                     │                 │ the root partition  │
       │                                     │                 │ is located on is    │
       │                                     │                 │ mounted to /boot or │
       │                                     │                 │ /efi, see below.    │
       └─────────────────────────────────────┴─────────────────┴─────────────────────┘

       The /home and /srv partitions may be encrypted in LUKS format. In
       this case, a device mapper device is set up under the names
       /dev/mapper/home and /dev/mapper/srv. Note that this might create
       conflicts if the same partition is listed in /etc/crypttab with a
       different device mapper device name.

       Mount and automount units for the EFI System Partition (ESP) are
       generated on EFI systems. The ESP is mounted to /boot, unless a mount
       point directory /efi exists, in which case it is mounted there. Since
       this generator creates an automount unit, the mount will only be
       activated on-demand, when accessed. On systems where /boot (or /efi
       if it exists) is an explicitly configured mount (for example, listed
       in fstab(5)) or where the /boot (or /efi) mount point is non-empty,
       no mount units are generated.

       When using this generator in conjunction with btrfs file systems,
       make sure to set the correct default subvolumes on them, using btrfs
       subvolume set-default.

       systemd-gpt-auto-generator implements systemd.generator(7).

SEE ALSO         top

       systemd(1), systemd.mount(5), systemd.swap(5),
       systemd-fstab-generator(8), systemd-cryptsetup@.service(8),
       cryptsetup(8), fstab(5), btrfs(8)

NOTES         top

        1. Discoverable Partitions Specification
           http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a bug
       report for this manual page, see 
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.  This
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       to man-pages@man7.org

systemd 231                                    SYSTEMD-GPT-AUTO-GENERATOR(8)