mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-27 08:04:14 +00:00
43 lines
1.8 KiB
Markdown
43 lines
1.8 KiB
Markdown
|
# File Systems {#ch-file-systems}
|
||
|
|
|
||
|
|
You can define file systems using the `fileSystems` configuration
|
||
|
|
option. For instance, the following definition causes NixOS to mount the
|
||
|
|
Ext4 file system on device `/dev/disk/by-label/data` onto the mount
|
||
|
|
point `/data`:
|
||
|
|
|
||
|
|
```nix
|
||
|
|
fileSystems."/data" =
|
||
|
|
{ device = "/dev/disk/by-label/data";
|
||
|
|
fsType = "ext4";
|
||
|
|
};
|
||
|
|
```
|
||
|
|
|
||
|
|
This will create an entry in `/etc/fstab`, which will generate a
|
||
|
|
corresponding [systemd.mount](https://www.freedesktop.org/software/systemd/man/systemd.mount.html)
|
||
|
|
unit via [systemd-fstab-generator](https://www.freedesktop.org/software/systemd/man/systemd-fstab-generator.html).
|
||
|
|
The filesystem will be mounted automatically unless `"noauto"` is
|
||
|
|
present in [options](#opt-fileSystems._name_.options). `"noauto"`
|
||
|
|
filesystems can be mounted explicitly using `systemctl` e.g.
|
||
|
|
`systemctl start data.mount`. Mount points are created automatically if they don't
|
||
|
|
already exist. For `device`, it's best to use the topology-independent
|
||
|
|
device aliases in `/dev/disk/by-label` and `/dev/disk/by-uuid`, as these
|
||
|
|
don't change if the topology changes (e.g. if a disk is moved to another
|
||
|
|
IDE controller).
|
||
|
|
|
||
|
|
You can usually omit the file system type (`fsType`), since `mount` can
|
||
|
|
usually detect the type and load the necessary kernel module
|
||
|
|
automatically. However, if the file system is needed at early boot (in
|
||
|
|
the initial ramdisk) and is not `ext2`, `ext3` or `ext4`, then it's best
|
||
|
|
to specify `fsType` to ensure that the kernel module is available.
|
||
|
|
|
||
|
|
::: {.note}
|
||
|
|
System startup will fail if any of the filesystems fails to mount,
|
||
|
|
dropping you to the emergency shell. You can make a mount asynchronous
|
||
|
|
and non-critical by adding `options = [ "nofail" ];`.
|
||
|
|
:::
|
||
|
|
|
||
|
|
```{=docbook}
|
||
|
|
<xi:include href="luks-file-systems.section.xml" />
|
||
|
|
<xi:include href="sshfs-file-systems.section.xml" />
|
||
|
|
```
|