systemd-gpt-auto-generator
systemd
Developer
Lennart
Poettering
lennart@poettering.net
systemd-gpt-auto-generator
8
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.
/usr/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. Note that this
generator has no effect on non-GPT systems, on systems
where the units are explicitly configured (for
example, listed in
fstab5),
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 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:
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.
Also note that
systemd-efi-boot-generator8
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.
See Also
systemd1,
systemd.mount5,
systemd.swap5,
systemd-fstab-generator8,
systemd-efi-boot-generator8,
systemd-cryptsetup@.service8,
cryptsetup8,
fstab5,
btrfs8