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Graham Christensen
2018-05-01 19:57:09 -04:00
parent 77161de454
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nixos/doc/manual/configuration/file-systems.xml
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@@ -3,44 +3,44 @@
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>:
<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" />
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>