SYSTEMD-GPT-AUTO-GENERATORsystemd-gpt-auto-generaSYSTEMD-GPT-AUTO-GENERATOR(8)NAMEsystemd-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
/usr/lib/systemd/system-generators/systemd-gpt-auto-generator
DESCRIPTIONsystemd-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 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, on systems where the units are explicitly configured (for
example, listed in fstab(5)), or where the mount points are non-empty.
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 search 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 32bit 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 64bit 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 32bit ARM │
│ │ (32bit 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 64bit ARM │
│ │ (64bit 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. │
└─────────────────────────────────────┴────────────────┴─────────────────────┘
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.
Also note that systemd-efi-boot-generator(8) will mount the EFI System
Partition (ESP) to /boot if not otherwise mounted.
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 the Generator Specification[2].
SEE ALSOsystemd(1), systemd.mount(5), systemd.swap(5), systemd-fstab-
generator(8), systemd-efi-boot-generator(8), systemd-
cryptsetup@.service(8), cryptsetup(8), fstab(5), btrfs(8)NOTES
1. Discoverable Partitions Specification
http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/
2. Generator Specification
http://www.freedesktop.org/wiki/Software/systemd/Generators
systemd 212SYSTEMD-GPT-AUTO-GENERATOR(8)
