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dracut/dracut.kernel.7.xml

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<?xml version='1.0' encoding='UTF-8'?>
<!-- This document was created with Syntext Serna Free. --><!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" []>
<refentry id="dracutkernel7">
<refentryinfo>
<title>dracut.kernel</title>
<productname>dracut</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Harald</firstname>
<surname>Hoyer</surname>
<email>harald@redhat.com</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>dracut.kernel</refentrytitle>
<manvolnum>7</manvolnum>
<refmiscinfo class="version"/>
</refmeta>
<refnamediv>
<refname>dracut.kernel</refname>
<refpurpose>dracut kernel command line options</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>The root filesystem used by the kernel is specified in the boot configuration
file, as always. The traditional <emphasis remap="B">root=/dev/hda1</emphasis> style device
specification is allowed. If a label is used, as in <emphasis remap="B">root=LABEL=rootPart</emphasis>
the initramfs will search all available devices for an ext2 or ext3 filesystem
with the appropriate label, and mount that device as the root filesystem.
<emphasis remap="B">root=UUID=uuidnumber</emphasis> will mount the partition with that UUID as the
root filesystem.</para>
<refsect2>
<title>Standard</title>
<variablelist>
<varlistentry>
<term>
<envar>init=<replaceable>&lt;path to real init&gt;</replaceable></envar>
</term>
<listitem>
<para> </para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>root=<replaceable>&lt;path to blockdevice&gt;</replaceable></envar>
</term>
<listitem>
<para>specify blockdevice to use as root filesystem.
e.g.: <programlisting>root=/dev/sda1
root=/dev/disk/by-path/pci-0000:00:1f.1-scsi-0:0:1:0-part1 </programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rootfstype=<replaceable>&lt;filesystem type&gt;</replaceable></envar>
</term>
<listitem>
<para>&quot;auto&quot; if not specified, e.g.: <programlisting>rootfstype=ext3</programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rootflags=<replaceable>&lt;mount options&gt;</replaceable></envar>
</term>
<listitem>
<para>specify additional mount options for the root filesystem. If not set, <filename>/etc/fstab</filename>
of the real root will be parsed for special mount options and mounted
accordingly.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>rd.fstab</envar>=0</term>
<listitem>
<para>do not honor special mount options for the root filesystem found in
<filename>/etc/fstab</filename> of the real root.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>Misc</title>
<variablelist>
<varlistentry>
<term>
<envar>rd.driver.blacklist=<replaceable>&lt;drivername&gt;</replaceable></envar>
</term>
<listitem>
<para>do not load kernel module &lt;drivername&gt;
This parameter can be specified multiple times.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.driver.pre=<replaceable>&lt;drivername&gt;</replaceable></envar>
</term>
<listitem>
<para>force loading kernel module &lt;drivername&gt;
This parameter can be specified multiple times.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2 id="dracut-kernel-debug">
<title>Debug</title>
<variablelist>
<varlistentry>
<term>
<envar>rd.info</envar>
</term>
<listitem>
<para>print informational output though &quot;quiet&quot; is set</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.shell</envar>
</term>
<listitem>
<para>allow dropping to a shell, if root mounting fails</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.debug</envar>
</term>
<listitem>
<para>set -x for the dracut shell and logs to dmesg, console and <filename>/init.log</filename></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.break</envar>
</term>
<listitem>
<para>drop to a shell at the end</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.break=</envar>
<replaceable>{cmdline|pre-udev|pre-trigger|initqueue|pre-mount|mount|pre-pivot}</replaceable>
</term>
<listitem>
<para>drop to a shell on defined breakpoint</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.udev.info</envar>
</term>
<listitem>
<para>set udev to loglevel info</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.udev.debug</envar>
</term>
<listitem>
<para>set udev to loglevel debug</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.timestamp</envar>
</term>
<listitem>
<para>export RDTIMESTAMP environment variable to init, which is set to the uptime of the dracut start.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>I18N</title>
<variablelist>
<varlistentry>
<term>
<envar>voonsole.keymap=</envar>
<replaceable>&lt;keymap base file name&gt;</replaceable>
</term>
<listitem>
<para>keyboard translation table loaded by loadkeys; taken from keymaps directory; will be written as <envar>KEYMAP</envar> to <filename>/etc/vconsole.conf</filename> in the initramfs, e.g.: <programlisting>vconsole.keymap=de-latin1-nodeadkeys</programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>vconsole.keymap.ext=</envar>
<replaceable>&lt;list of keymap base file names&gt;</replaceable>
</term>
<listitem>
<para>list of extra keymaps to bo loaded (sep. by space); will be written as <envar>EXT_KEYMAP</envar> to <filename>/etc/vconsole.conf</filename> in the initramfs</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>vconsole.font.unicode=</envar>
<replaceable>&lt;1|0&gt;</replaceable>
</term>
<listitem>
<para>boolean, indicating UTF-8 mode; will be written as <envar>UNICODE</envar> to <filename>/etc/vconsole.conf</filename> in the initramfs</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>vconsole.font=</envar>
<replaceable>&lt;font base file name&gt;</replaceable>
</term>
<listitem>
<para>console font; taken from consolefonts directory; will be written as <envar>FONT</envar> to <filename>/etc/vconsole.conf</filename> in the initramfs; e.g.: <programlisting>vconsole.font=LatArCyrHeb-16</programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>vconsole.font.map=</envar>
<replaceable>&lt;console map base file name&gt;</replaceable>
</term>
<listitem>
<para>see description of &apos;-m&apos; parameter in setfont manual; taken from consoletrans directory; will be written as <envar>FONT_MAP</envar> to <filename>/etc/vconsole.conf</filename> in the initramfs</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>vconsole.font.unimap=</envar>
<replaceable>&lt;unicode table base file name&gt;</replaceable>
</term>
<listitem>
<para>see description of &apos;-u&apos; parameter in setfont manual; taken from unimaps directory; will be written as <envar>FONT_UNIMAP</envar> to <filename>/etc/vconsole.conf</filename> in the initramfs</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>locale.LANG=</envar>
<replaceable>&lt;locale&gt;</replaceable>
</term>
<listitem>
<para>taken from the environment; if no UNICODE is defined we set its value in basis of LANG value (whether it ends with &quot;.utf8&quot; (or similar) or not); will be written as <envar>LANG</envar> to <filename>/etc/locale.conf</filename> in the initramfs; e.g.: <programlisting>locale.LANG=pl_PL.utf8</programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>locale.LC_ALL=</envar>
<replaceable>&lt;locale&gt;</replaceable>
</term>
<listitem>
<para>taken from the environment; will be written as <envar>LC_ALL</envar> to <filename>/etc/locale.conf</filename> in the initramfs</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>LVM</title>
<variablelist>
<varlistentry>
<term><envar>rd.lvm</envar>=0</term>
<listitem>
<para>disable LVM detection</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.lvm.vg=<replaceable>&lt;volume group name&gt;</replaceable></envar>
</term>
<listitem>
<para>only activate the volume groups with the given name
<envar>rd.lvm.vg</envar> can be specified multiple times on the kernel command line.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.lvm.lv=<replaceable>&lt;logical volume name&gt;</replaceable></envar>
</term>
<listitem>
<para>only activate the logical volumes with the given name
<envar>rd.lvm.lv</envar> can be specified multiple times on the kernel command line.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.lvm.conf</envar>
</term>
<listitem>
<para>remove any <filename>/etc/lvm/lvm.conf</filename>, which may exist in the initramfs</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>crypto LUKS</title>
<variablelist>
<varlistentry>
<term><envar>rd.luks</envar>=0</term>
<listitem>
<para>disable crypto LUKS detection</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.luks.uuid=<replaceable>&lt;luks uuid&gt;</replaceable></envar>
</term>
<listitem>
<para>only activate the LUKS partitions with the given UUID
Any &quot;luks-&quot; of the LUKS UUID is removed before comparing to <replaceable>&lt;luks uuid&gt;</replaceable>.
The comparisons also matches, if <replaceable>&lt;luks uuid&gt;</replaceable> is only the beginning of the
LUKS UUID, so you don&apos;t have to specify the full UUID.
This parameter can be specified multiple times.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.luks.crypttab</envar>
</term>
<listitem>
<para>do not check, if LUKS partition is in <filename>/etc/crypttab</filename></para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>crypt LUKS - experimental removable keys support</title>
<para>works only when plymouth module is not included</para>
<variablelist>
<varlistentry>
<term>
<envar>rd.luks.keypath=</envar>
<replaceable>&lt;path to keyfile&gt;</replaceable>
</term>
<listitem>
<para>path to keyfile inside remove device filesystem</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.luks.keydev.uuid=</envar>
<replaceable>&lt;rem. device uuid&gt;</replaceable>
</term>
<listitem>
<para>UUID of removalbe device storing keyfile; UUID doesn&apos;t have to be exact just like for <envar>rd.luks.uuid</envar></para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>MD</title>
<variablelist>
<varlistentry>
<term><envar>rd.md</envar>=0</term>
<listitem>
<para>disable MD RAID detection</para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>rd.md.imsm</envar>=0</term>
<listitem>
<para>disable MD RAID for imsm/isw raids, use DM RAID instead</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.md.conf</envar>
</term>
<listitem>
<para>ignore mdadm.conf included in initramfs</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.md.uuid=<replaceable>&lt;md raid uuid&gt;</replaceable></envar>
</term>
<listitem>
<para>only activate the raid sets with the given UUID.
This parameter can be specified multiple times.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>DM RAID</title>
<variablelist>
<varlistentry>
<term><envar>rd.dm</envar>=0</term>
<listitem>
<para>disable DM RAID detection</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.dm.uuid=<replaceable>&lt;dm raid uuid&gt;</replaceable></envar>
</term>
<listitem>
<para>only activate the raid sets with the given UUID.
This parameter can be specified multiple times.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>Network</title>
<variablelist>
<varlistentry>
<term>
<envar>ip=</envar>
<replaceable>{dhcp|on|any|dhcp6|auto6}</replaceable>
</term>
<listitem>
<para>dhcp|on|any: get ip from dhcp server from all interfaces. If root=dhcp,
loop sequentially through all interfaces (eth0, eth1, ...) and use the first
with a valid DHCP root-path.</para>
<para><constant>auto6</constant>: IPv6 autoconfiguration</para>
<para><constant>dhcp6</constant>: IPv6 DHCP</para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>ip=</envar><replaceable>&lt;interface&gt;</replaceable>:<replaceable>{dhcp|on|any|dhcp6|auto6}</replaceable></term>
<listitem>
<para>dhcp|on|any|dhcp6: get ip from dhcp server on a specific interface
auto6: do IPv6 autoconfiguration
This parameter can be specified multiple times.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>ip=</envar><replaceable>&lt;client-IP&gt;</replaceable>:<optional>
<replaceable>&lt;server-id&gt;</replaceable>
</optional>:<replaceable>&lt;gateway-IP&gt;</replaceable>:<replaceable>&lt;netmask&gt;</replaceable>:<replaceable>&lt;client_hostname&gt;</replaceable>:<replaceable>&lt;interface&gt;</replaceable>:<replaceable>{none|off}</replaceable></term>
<listitem>
<para>explicit network configuration. If you want do define a IPv6 address, put it in brackets (e.g. [2001:DB8::1]).
This parameter can be specified multiple times.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>ifname=</envar><replaceable>&lt;interface&gt;</replaceable>:<replaceable>&lt;MAC&gt;</replaceable></term>
<listitem>
<para>Assign network device name &lt;interface&gt; (ie eth0) to the NIC with MAC &lt;MAC&gt;.
Note letters in the MAC-address must be lowercase!
<remark>Note: If you use this option you <emphasis remap="B">must</emphasis> specify an ifname= argument for all interfaces used in ip= or fcoe= arguments.</remark>
This parameter can be specified multiple times.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>bootdev=</envar>
<replaceable>&lt;interface&gt;</replaceable>
</term>
<listitem>
<para>specify network interface to use routing and netroot information from.
Required if multiple ip= lines are used.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>nameserver=</envar>
<replaceable>&lt;IP&gt;</replaceable>
<optional><envar>nameserver</envar>=<replaceable>&lt;IP&gt;</replaceable> ...</optional>
</term>
<listitem>
<para>specify nameserver(s) to use</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>NFS</title>
<variablelist>
<varlistentry>
<term>
<envar>root=</envar>
<optional><replaceable>&lt;server-ip&gt;</replaceable>:</optional>
<replaceable>&lt;root-dir&gt;</replaceable>
<optional>:<replaceable>&lt;nfs-options&gt;</replaceable></optional>
</term>
<listitem>
<para>mount nfs share from &lt;server-ip&gt;:/&lt;root-dir&gt;, if no server-ip is given,
use dhcp next_server. if server-ip is an IPv6 address it has to be put in brackets, e.g. [2001:DB8::1].
NFS options can be appended with the prefix &quot;:&quot; or &quot;,&quot; and are seperated by &quot;,&quot;.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>root=</envar><constant>nfs</constant>:<optional><replaceable>&lt;server-ip&gt;</replaceable>:</optional><replaceable>&lt;root-dir&gt;</replaceable><optional>:<replaceable>&lt;nfs-options&gt;</replaceable></optional></term>
<term><envar>root=</envar>nfs4:<optional><replaceable>&lt;server-ip&gt;</replaceable>:</optional><replaceable>&lt;root-dir&gt;</replaceable><optional>:<replaceable>&lt;nfs-options&gt;</replaceable></optional></term>
<term>
<envar>root=</envar>
<replaceable>{dhcp|dhcp6}</replaceable>
</term>
<listitem>
<para>root=dhcp alone directs initrd to look at the DHCP root-path where NFS
options can be specified.
root-path=&lt;server-ip&gt;:&lt;root-dir&gt;[,&lt;nfs-options&gt;]
root-path=nfs:&lt;server-ip&gt;:&lt;root-dir&gt;[,&lt;nfs-options&gt;]
root-path=nfs4:&lt;server-ip&gt;:&lt;root-dir&gt;[,&lt;nfs-options&gt;]</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>root=</envar>
<filename>/dev/nfs</filename>
<envar> nfsroot=</envar>
<optional><replaceable>&lt;server-ip&gt;</replaceable>:</optional>
<replaceable>&lt;root-dir&gt;</replaceable>
<optional>:<replaceable>&lt;nfs-options&gt;</replaceable></optional>
</term>
<listitem>
<para><emphasis remap="B">Deprecated!</emphasis> kernel Documentation<filename>/filesystems/nfsroot.txt</filename> defines
this method.
This is supported by dracut, but not recommended.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar remap="B">rd.nfs.domain=</envar>
<replaceable>&lt;NFSv4 domain name&gt;</replaceable>
</term>
<listitem>
<para>Set the NFSv4 domain name. Will overwrite the settings in <filename>/etc/idmap.conf</filename>.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>iSCSI</title>
<variablelist>
<varlistentry>
<term><envar>root=</envar><constant>iscsi</constant>:<optional><replaceable>&lt;username&gt;</replaceable>:<replaceable>&lt;password&gt;</replaceable><optional>:<replaceable>&lt;reverse&gt;</replaceable>:<replaceable>&lt;password&gt;</replaceable></optional>@</optional><optional>
<replaceable>&lt;servername&gt;</replaceable>
</optional>:<optional>
<replaceable>&lt;protocol&gt;</replaceable>
</optional>:<optional>
<replaceable>&lt;port&gt;</replaceable>
</optional>:<optional>
<replaceable>&lt;LUN&gt;</replaceable>
</optional>:<replaceable>&lt;targetname&gt;</replaceable></term>
<listitem>
<para>protocol defaults to &quot;6&quot;, LUN defaults to &quot;0&quot;.</para>
<para>If the &quot;servername&quot; field is provided by <acronym>BOOTP</acronym> or <acronym>DHCP</acronym>, then that
field is used in conjunction with other associated fields to contact
the boot server in the Boot stage. However, if the
&quot;servername&quot; field is not provided, then the &quot;targetname&quot; field is
then used in the Discovery Service stage in conjunction with other
associated fields.</para>
<para>See <ulink url="http://tools.ietf.org/html/rfc4173#section-5">http://tools.ietf.org/html/rfc4173</ulink>.</para>
<para>e.g.:<programlisting>root=iscsi:192.168.50.1::::iqn.2009-06.dracut:target0 </programlisting></para>
<para>If servername is an IPv6 address, it has to be put in brackets. e.g.:
<programlisting>root=iscsi:[2001:DB8::1]::::iqn.2009-06.dracut:target0 </programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>root=</envar><replaceable>???</replaceable><envar> netroot=</envar><constant>iscsi</constant>:<optional><replaceable>&lt;username&gt;</replaceable>:<replaceable>&lt;password&gt;</replaceable><optional>:<replaceable>&lt;reverse&gt;</replaceable>:<replaceable>&lt;password&gt;</replaceable></optional>@</optional><optional>
<replaceable>&lt;servername&gt;</replaceable>
</optional>:<optional>
<replaceable>&lt;protocol&gt;</replaceable>
</optional>:<optional>
<replaceable>&lt;port&gt;</replaceable>
</optional>:<optional>
<replaceable>&lt;LUN&gt;</replaceable>
</optional>:<replaceable>&lt;targetname&gt;</replaceable> ...</term>
<listitem>
<para>multiple netroot options allow setting up multiple iscsi disks. e.g.:
<programlisting>root=UUID=12424547
netroot=iscsi:192.168.50.1::::iqn.2009-06.dracut:target0
netroot=iscsi:192.168.50.1::::iqn.2009-06.dracut:target1 </programlisting></para>
<para>If servername is an IPv6 address, it has to be put in brackets.
e.g.:
<programlisting>netroot=iscsi:[2001:DB8::1]::::iqn.2009-06.dracut:target0</programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>root=<replaceable>???</replaceable></envar>
<envar> iscsi_initiator=<replaceable>&lt;initiator&gt; </replaceable></envar>
<envar>iscsi_target_name=<replaceable>&lt;target_name&gt; </replaceable></envar>
<envar>iscsi_target_ip=<replaceable>&lt;target ip&gt; </replaceable></envar>
<envar>iscsi_target_port=<replaceable>&lt;target port&gt; </replaceable></envar>
<envar>iscsi_target_group=<replaceable>&lt;target group&gt; </replaceable></envar>
<envar>iscsi_username=<replaceable>&lt;username&gt; </replaceable></envar>
<envar>iscsi_password=<replaceable>&lt;password&gt; </replaceable></envar>
<envar>iscsi_in_username=<replaceable>&lt;in username&gt; </replaceable></envar>
<envar>iscsi_in_password=<replaceable>&lt;in password&gt; </replaceable></envar>
</term>
<listitem>
<para>manually specify all iscsistart parameter (see <userinput>iscsistart&nbsp;--help</userinput>)</para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>root=</envar>???<envar> iscsi_firmware</envar></term>
<listitem>
<para>will read the iscsi parameter from the BIOS firmware</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>FCoE</title>
<variablelist>
<varlistentry>
<term><envar>netroot=</envar><constant>fcoe</constant>:<replaceable>&lt;interface|MAC&gt;</replaceable>:<replaceable>{dcb|nodcb}</replaceable></term>
<listitem>
<para>Try to connect to a FCoE SAN through the NIC specified by <replaceable>&lt;interface&gt;</replaceable> or <replaceable>&lt;MAC&gt;</replaceable>,
for the second argument, currently only nodcb is supported. <remark>Note: letters in the MAC-address must be lowercase!</remark></para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>NBD</title>
<variablelist>
<varlistentry>
<term><envar>root=</envar><constant>nbd</constant>:<replaceable>&lt;server&gt;</replaceable>:<replaceable>&lt;port&gt;</replaceable><optional>:<replaceable>&lt;fstype&gt;</replaceable></optional><optional>:<replaceable>&lt;mountopts&gt;</replaceable></optional></term>
<listitem>
<para>mount nbd share from &lt;server&gt;</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>root=dhcp</envar>
</term>
<listitem>
<para>with dhcp root-path=nbd:&lt;server&gt;:&lt;port&gt;[:&lt;fstype&gt;][:&lt;mountopts&gt;]
root=dhcp alone directs initrd to look at the DHCP root-path where NBD
options can be specified.
This syntax is only usable in cases where you are directly mounting the volume
as the rootfs.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>DASD</title>
<variablelist>
<varlistentry>
<term><envar>rd.dasd_mod.dasd=</envar>....</term>
<listitem>
<para>same syntax as the kernel module parameter (s390 only)</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.dasd=</envar>
<replaceable>&lt;dasd_adaptor device bus ID&gt;</replaceable>
<optional>,readonly=<replaceable>X</replaceable></optional>
<optional>,use_diag=<replaceable>X</replaceable></optional>
<optional>,erplog=<replaceable>X</replaceable></optional>
</term>
<listitem>
<para>activate DASD device with the given adaptor device bus ID and setting the sysfs attributes
to the specified values
This parameter can be specified multiple times.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>ZFCP</title>
<variablelist>
<varlistentry>
<term><envar>rd.zfcp=</envar><replaceable>&lt;zfcp adaptor device bus ID&gt;</replaceable>,<replaceable>&lt;WWPN&gt;</replaceable>,<replaceable>&lt;FCPLUN&gt;</replaceable></term>
<listitem>
<para>rd.zfcp can be specified multiple times on the kernel command line. e.g.: <programlisting>rd.zfcp=0.0.4000,0x5005076300C213e9,0x5022000000000000</programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd.zfcp.conf</envar>
</term>
<listitem>
<para>ignore zfcp.conf included in the initramfs</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>ZNET</title>
<variablelist>
<varlistentry>
<term><envar>rd_ZNET=</envar><replaceable>&lt;nettype&gt;</replaceable>,<replaceable>&lt;subchannels&gt;</replaceable>,<replaceable>&lt;options&gt;</replaceable></term>
<listitem>
<para>rd_ZNET can be specified multiple times on the kernel command line. e.g.:
<programlisting>rd_ZNET=qeth,0.0.0600,0.0.0601,0.0.0602,layer2=1,portname=foo
rd_ZNET=ctc,0.0.0600,0.0.0601,0.0.0602,protocol=bar</programlisting></para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>Plymouth Boot Splash</title>
<variablelist>
<varlistentry>
<term><envar>rd.plymouth</envar>=0</term>
<listitem>
<para>disable plymouth. This will not work with encrypted partitions.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>Deprecated, renamed Options</title>
<para>Here is a list of options, which were used in dracut prior to version 008, and their new replacement.</para>
<variablelist>
<varlistentry>
<term>
<envar>rdbreak</envar>
</term>
<listitem>
<para><envar>rd.break</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_CCW</envar>
</term>
<listitem>
<para><envar>rd.ccw</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rdcopystate</envar>
</term>
<listitem>
<para><envar>rd.copystate</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_DASD_MOD</envar>
</term>
<listitem>
<para><envar>rd.dasd_mod.dasd</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_DASD</envar>
</term>
<listitem>
<para><envar>rd.dasd</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rdinitdebug rdnetdebug</envar>
</term>
<listitem>
<para><envar>rd.debug</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_DM</envar>
</term>
<listitem>
<para><envar>rd.dm</envar>=0</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_DM_UUID</envar>
</term>
<listitem>
<para><envar>rd.dm.uuid</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rdblacklist</envar>
</term>
<listitem>
<para><envar>rd.driver.blacklist</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rdinsmodpost</envar>
</term>
<listitem>
<para><envar>rd.driver.post</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rdloaddriver</envar>
</term>
<listitem>
<para><envar>rd.driver.pre</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_FSTAB</envar>
</term>
<listitem>
<para><envar>rd.fstab</envar>=0</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rdinfo</envar>
</term>
<listitem>
<para><envar>rd.info</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>check</envar>
</term>
<listitem>
<para><envar>rd.live.check</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rdlivedebug</envar>
</term>
<listitem>
<para><envar>rd.live.debug</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>live_dir</envar>
</term>
<listitem>
<para><envar>rd.live.dir</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>liveimg</envar>
</term>
<listitem>
<para><envar>rd.live.image</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>overlay</envar>
</term>
<listitem>
<para><envar>rd.live.overlay</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>readonly_overlay</envar>
</term>
<listitem>
<para><envar>rd.live.overlay.readonly</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>reset_overlay</envar>
</term>
<listitem>
<para><envar>rd.live.overlay.reset</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>live_ram</envar>
</term>
<listitem>
<para><envar>rd.live.ram</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_CRYPTTAB</envar>
</term>
<listitem>
<para><envar>rd.luks.crypttab</envar>=0</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_LUKS_KEYDEV_UUID</envar>
</term>
<listitem>
<para><envar>rd.luks.keydev.uuid</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_LUKS_KEYPATH</envar>
</term>
<listitem>
<para><envar>rd.luks.keypath</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_LUKS</envar>
</term>
<listitem>
<para><envar>rd.luks</envar>=0</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_LUKS_UUID</envar>
</term>
<listitem>
<para><envar>rd.luks.uuid</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_LUKS_UUID</envar>
</term>
<listitem>
<para><envar>rd.luks.uuid</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_LVMCONF</envar>
</term>
<listitem>
<para><envar>rd.lvm.conf</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_LVM_LV</envar>
</term>
<listitem>
<para><envar>rd.lvm.lv</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_LVM</envar>
</term>
<listitem>
<para><envar>rd.lvm</envar>=0</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_LVM_SNAPSHOT</envar>
</term>
<listitem>
<para><envar>rd.lvm.snapshot</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_LVM_SNAPSIZE</envar>
</term>
<listitem>
<para><envar>rd.lvm.snapsize</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_LVM_VG</envar>
</term>
<listitem>
<para><envar>rd.lvm.vg</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_MDADMCONF</envar>
</term>
<listitem>
<para><envar>rd.md.conf</envar>=0</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_MDIMSM</envar>
</term>
<listitem>
<para><envar>rd.md.imsm</envar>=0</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_MD</envar>
</term>
<listitem>
<para><envar>rd.md</envar>=0</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_MD_UUID</envar>
</term>
<listitem>
<para><envar>rd.md.uuid</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NFS_DOMAIN</envar>
</term>
<listitem>
<para><envar>rd.nfs.domain</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_PLYMOUTH</envar>
</term>
<listitem>
<para><envar>rd.plymouth</envar>=0</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_retry</envar>
</term>
<listitem>
<para><envar>rd.retry</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rdshell</envar>
</term>
<listitem>
<para><envar>rd.shell</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_SPLASH</envar>
</term>
<listitem>
<para><envar>rd.splash</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rdudevdebug</envar>
</term>
<listitem>
<para><envar>rd.udev.debug</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rdudevinfo</envar>
</term>
<listitem>
<para><envar>rd.udev.info</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_NO_ZFCPCONF</envar>
</term>
<listitem>
<para><envar>rd.zfcp.conf</envar>=0</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>rd_ZFCP</envar>
</term>
<listitem>
<para><envar>rd.zfcp</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>KEYMAP</envar>
</term>
<listitem>
<para><envar>vconsole.keymap</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>KEYTABLE</envar>
</term>
<listitem>
<para><envar>vconsole.keymap</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>SYSFONT</envar>
</term>
<listitem>
<para><envar>vconsole.font</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>CONTRANS</envar>
</term>
<listitem>
<para><envar>vconsole.font.map</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>UNIMAP</envar>
</term>
<listitem>
<para><envar>vconsole.font.unimap</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>UNICODE</envar>
</term>
<listitem>
<para><envar>vconsole.font.unicode</envar></para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<envar>EXT_KEYMAP</envar>
</term>
<listitem>
<para><envar>vconsole.keymap.ext</envar></para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
</refsect1>
<refsect1>
<title>Configuration in the Initramfs</title>
<variablelist>
<varlistentry>
<term>
<filename>/conf/conf.d/</filename>
</term>
<listitem>
<para>Any files found in <filename>/conf/conf.d/</filename> will be sourced in the initramfs to
set initial values. Command line options will override these values
set in the configuration files.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<filename>/etc/cmdline</filename>
</term>
<listitem>
<para>Can contain additional command line options.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry>
<refentrytitle>dracut</refentrytitle>
<manvolnum>8</manvolnum>
</citerefentry>
<citerefentry>
<refentrytitle>dracut.conf</refentrytitle>
<manvolnum>5</manvolnum>
</citerefentry>
</para>
</refsect1>
</refentry>