NAME¶
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¶
/lib/systemd/system-generators/systemd-gpt-auto-generator
DESCRIPTION¶
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 (x86) |
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 /. |
4f68bce3-e8cd-4db1-96e7-fbcaf984b709 |
Root Partition (x86-64) |
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 /. |
69dad710-2ce4-4e3c-b16c-21a1d49abed3 |
Root Partition (32-bit ARM) |
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 /. |
b921b045-1df0-41c3-af44-4c6f280d3fae |
Root Partition (64-bit ARM) |
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 /. |
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 Partition |
The first server 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.
Mount and automount units for the EFI System Partition (ESP), mounting it to
/boot, are generated on EFI systems where the boot loader communicates the
used ESP to the operating system. Since this generator creates an automount
unit, the mount will only be activated on-demand, when accessed. On systems
where /boot is an explicitly configured mount (for example, listed in
fstab(5)) or where the /boot 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¶
systemd(1),
systemd.mount(5),
systemd.swap(5),
systemd-fstab-generator(8),
systemd-cryptsetup@.service(8),
cryptsetup(8),
fstab(5),
btrfs(8)
NOTES¶
- 1.
- Discoverable Partitions Specification