systemd-gpt-auto-generator — Generator for automatically discovering
and mounting root,
/srv partitions, as well as
discovering and enabling swap partitions, based on GPT
partition type GUIDs.
systemd-gpt-auto-generator is a unit
generator that automatically discovers root,
/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
Partitions Specification. 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
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
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||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||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||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||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 |
|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 |
|0657fd6d-a4ab-43c4-84e5-0933c84b4f4f||Swap||All swap partitions located on the disk the root partition is located on are enabled.|
partitions may be encrypted in LUKS format. In this case, a device
mapper device is set up under the names
/dev/mapper/srv. Note that this might create
conflicts if the same partition is listed in
/etc/crypttab with a different device mapper
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
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.