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<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="ch-file-systems">
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<title>File Systems</title>
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<para>You can define file systems using the
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<option>fileSystems</option> configuration option. For instance, the
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following definition causes NixOS to mount the Ext4 file system on
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device <filename>/dev/disk/by-label/data</filename> onto the mount
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point <filename>/data</filename>:
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<programlisting>
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<xref linkend="opt-fileSystems"/>."/data" =
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{ device = "/dev/disk/by-label/data";
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fsType = "ext4";
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};
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</programlisting>
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Mount points are created automatically if they don’t already exist.
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For <option><link linkend="opt-fileSystems._name__.device">device</link></option>, it’s best to use the topology-independent
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device aliases in <filename>/dev/disk/by-label</filename> and
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<filename>/dev/disk/by-uuid</filename>, as these don’t change if the
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topology changes (e.g. if a disk is moved to another IDE
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controller).</para>
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<para>You can usually omit the file system type
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(<option><link linkend="opt-fileSystems._name__.fsType">fsType</link></option>), since <command>mount</command> can usually
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detect the type and load the necessary kernel module automatically.
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However, if the file system is needed at early boot (in the initial
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ramdisk) and is not <literal>ext2</literal>, <literal>ext3</literal>
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or <literal>ext4</literal>, then it’s best to specify
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<option>fsType</option> to ensure that the kernel module is
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available.</para>
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2017-04-30 13:10:30 +01:00
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<note><para>System startup will fail if any of the filesystems fails to mount,
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dropping you to the emergency shell.
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You can make a mount asynchronous and non-critical by adding
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<literal><link linkend="opt-fileSystems._name__.options">options</link> = [ "nofail" ];</literal>.
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</para></note>
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2014-08-26 14:45:47 +01:00
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<xi:include href="luks-file-systems.xml" />
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</chapter>
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