46 lines
2 KiB
XML
46 lines
2 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
|
||
xmlns:xlink="http://www.w3.org/1999/xlink"
|
||
xmlns:xi="http://www.w3.org/2001/XInclude"
|
||
version="5.0"
|
||
xml:id="ch-file-systems">
|
||
<title>File Systems</title>
|
||
<para>
|
||
You can define file systems using the <option>fileSystems</option>
|
||
configuration option. For instance, the following definition causes NixOS to
|
||
mount the Ext4 file system on device
|
||
<filename>/dev/disk/by-label/data</filename> onto the mount point
|
||
<filename>/data</filename>:
|
||
<programlisting>
|
||
<xref linkend="opt-fileSystems"/>."/data" =
|
||
{ device = "/dev/disk/by-label/data";
|
||
fsType = "ext4";
|
||
};
|
||
</programlisting>
|
||
Mount points are created automatically if they don’t already exist. For
|
||
<option><link linkend="opt-fileSystems._name__.device">device</link></option>,
|
||
it’s best to use the topology-independent device aliases in
|
||
<filename>/dev/disk/by-label</filename> and
|
||
<filename>/dev/disk/by-uuid</filename>, as these don’t change if the
|
||
topology changes (e.g. if a disk is moved to another IDE controller).
|
||
</para>
|
||
<para>
|
||
You can usually omit the file system type
|
||
(<option><link linkend="opt-fileSystems._name__.fsType">fsType</link></option>),
|
||
since <command>mount</command> 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 <literal>ext2</literal>,
|
||
<literal>ext3</literal> or <literal>ext4</literal>, then it’s best to
|
||
specify <option>fsType</option> to ensure that the kernel module is
|
||
available.
|
||
</para>
|
||
<note>
|
||
<para>
|
||
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
|
||
<literal><link linkend="opt-fileSystems._name__.options">options</link> = [
|
||
"nofail" ];</literal>.
|
||
</para>
|
||
</note>
|
||
<xi:include href="luks-file-systems.xml" />
|
||
</chapter>
|