Provided by: dracut_013-2_all bug

NAME

       dracut.kernel - dracut kernel command line options

DESCRIPTION

       The root filesystem used by the kernel is specified in the boot
       configuration file, as always. The traditional root=/dev/hda1 style
       device specification is allowed. If a label is used, as in
       root=LABEL=rootPart 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.  root=UUID=uuidnumber will mount the
       partition with that UUID as the root filesystem.

   Standard
       init=<path to real init>

       root=<path to blockdevice>
           specify blockdevice to use as root filesystem. e.g.:

               root=/dev/sda1
               root=/dev/disk/by-path/pci-0000:00:1f.1-scsi-0:0:1:0-part1

       rootfstype=<filesystem type>
           "auto" if not specified, e.g.:

               rootfstype=ext3

       rootflags=<mount options>
           specify additional mount options for the root filesystem. If not
           set, /etc/fstab of the real root will be parsed for special mount
           options and mounted accordingly.

       rd.fstab=0
           do not honor special mount options for the root filesystem found in
           /etc/fstab of the real root.

   Misc
       rd.driver.blacklist=<drivername>[,<drivername>,...]
           do not load kernel module <drivername>. This parameter can be
           specified multiple times.

       rd.driver.pre=<drivername>[,<drivername>,...]
           force loading kernel module <drivername>. This parameter can be
           specified multiple times.

       rd.driver.post=<drivername>[,<drivername>,...]
           force loading kernel module <drivername> after all automatic
           loading modules have been loaded. This parameter can be specified
           multiple times.

   Debug
       rd.info
           print informational output though "quiet" is set

       rd.shell
           allow dropping to a shell, if root mounting fails

       rd.debug
           set -x for the dracut shell and logs to dmesg, console and
           /run/initramfs/init.log

       rd.break
           drop to a shell at the end

       rd.break={cmdline|pre-udev|pre-trigger|initqueue|pre-mount|mount|pre-pivot}
           drop to a shell on defined breakpoint

       rd.udev.info
           set udev to loglevel info

       rd.udev.debug
           set udev to loglevel debug

   I18N
       vconsole.keymap= <keymap base file name>
           keyboard translation table loaded by loadkeys; taken from keymaps
           directory; will be written as KEYMAP to /etc/vconsole.conf in the
           initramfs, e.g.:

               vconsole.keymap=de-latin1-nodeadkeys

       vconsole.keymap.ext=<list of keymap base file names>
           list of extra keymaps to bo loaded (sep. by space); will be written
           as EXT_KEYMAP to /etc/vconsole.conf in the initramfs

       vconsole.unicode=<1|0>
           boolean, indicating UTF-8 mode; will be written as UNICODE to
           /etc/vconsole.conf in the initramfs

       vconsole.font=<font base file name>
           console font; taken from consolefonts directory; will be written as
           FONT to /etc/vconsole.conf in the initramfs; e.g.:

               vconsole.font=LatArCyrHeb-16

       vconsole.font.map=<console map base file name>
           see description of '-m' parameter in setfont manual; taken from
           consoletrans directory; will be written as FONT_MAP to
           /etc/vconsole.conf in the initramfs

       vconsole.font.unimap=<unicode table base file name>
           see description of '-u' parameter in setfont manual; taken from
           unimaps directory; will be written as FONT_UNIMAP to
           /etc/vconsole.conf in the initramfs

       locale.LANG=<locale>
           taken from the environment; if no UNICODE is defined we set its
           value in basis of LANG value (whether it ends with ".utf8" (or
           similar) or not); will be written as LANG to /etc/locale.conf in
           the initramfs; e.g.:

               locale.LANG=pl_PL.utf8

       locale.LC_ALL=<locale>
           taken from the environment; will be written as LC_ALL to
           /etc/locale.conf in the initramfs

   LVM
       rd.lvm=0
           disable LVM detection

       rd.lvm.vg=<volume group name>
           only activate the volume groups with the given name rd.lvm.vg can
           be specified multiple times on the kernel command line.

       rd.lvm.lv=<logical volume name>
           only activate the logical volumes with the given name rd.lvm.lv can
           be specified multiple times on the kernel command line.

       rd.lvm.conf=0
           remove any /etc/lvm/lvm.conf, which may exist in the initramfs

   crypto LUKS
       rd.luks=0
           disable crypto LUKS detection

       rd.luks.uuid=<luks uuid>
           only activate the LUKS partitions with the given UUID Any "luks-"
           of the LUKS UUID is removed before comparing to <luks uuid>. The
           comparisons also matches, if <luks uuid> is only the beginning of
           the LUKS UUID, so you don't have to specify the full UUID. This
           parameter can be specified multiple times.

       rd.luks.crypttab=0
           do not check, if LUKS partition is in /etc/crypttab

   crypto LUKS - key on removable device support
       rd.luks.key=<keypath>:<keydev>:<luksdev>
           keypath is a path to key file to look for. It's REQUIRED. When
           keypath ends with '.gpg' it's considered to be key encrypted
           symmetrically with GPG. You will be prompted for password on boot.
           GPG support comes with 'crypt-gpg' module which needs to be added
           explicitly.

           keydev is a device on which key file resides. It might be kernel
           name of devices (should start with "/dev/"), UUID (prefixed with
           "UUID=") or label (prefix with "LABEL="). You don't have to specify
           full UUID. Just its beginning will suffice, even if its ambiguous.
           All matching devices will be probed. This parameter is recommended,
           but not required. If not present, all block devices will be probed,
           which may significantly increase boot time.

           If luksdev is given, the specified key will only be applied for
           that LUKS device. Possible values are the same as for keydev.
           Unless you have several LUKS devices, you don't have to specify
           this parameter.

           The simplest usage is:

               rd.luks.key=/foo/bar.key

           As you see, you can skip colons in such case.

   MD
       rd.md=0
           disable MD RAID detection

       rd.md.imsm=0
           disable MD RAID for imsm/isw raids, use DM RAID instead

       rd.md.conf=0
           ignore mdadm.conf included in initramfs

       rd.md.uuid=<md raid uuid>
           only activate the raid sets with the given UUID. This parameter can
           be specified multiple times.

   DM RAID
       rd.dm=0
           disable DM RAID detection

       rd.dm.uuid=<dm raid uuid>
           only activate the raid sets with the given UUID. This parameter can
           be specified multiple times.

   FIPS
       rd.fips
           enable FIPS

       boot=<boot device>
           specify the device, where /boot is located.

               e.g.
                 boot=/dev/sda1
                 boot=/dev/disk/by-path/pci-0000:00:1f.1-scsi-0:0:1:0-part1
                 boot=UUID=<uuid>
                 boot=LABEL=<label>

       rd.fips.skipkernel
           skip checksum check of the kernel image. Useful, if the kernel
           image is not in a separate boot partition.

   Network
       ip={dhcp|on|any|dhcp6|auto6|ibft}
           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.

           auto6: IPv6 autoconfiguration

           dhcp6: IPv6 DHCP

           ibft: iBFT autoconfiguration

       ip=<interface>:{dhcp|on|any|dhcp6|auto6}
           dhcp|on|any|dhcp6: get ip from dhcp server on a specific interface

           auto6: do IPv6 autoconfiguration

           This parameter can be specified multiple times.

       ip=<client-IP>:[ <server-id>
       ]:<gateway-IP>:<netmask>:<client_hostname>:<interface>:{none|off}
           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.

       ifname=<interface>:<MAC>
           Assign network device name <interface> (ie eth0) to the NIC with
           MAC <MAC>. Note letters in the MAC-address must be lowercase!
           Note: If you use this option you must specify an ifname= argument
           for all interfaces used in ip= or fcoe= arguments.  This parameter
           can be specified multiple times.

       bootdev=<interface>
           specify network interface to use routing and netroot information
           from. Required if multiple ip= lines are used.

       nameserver=<IP>[nameserver=<IP> ...]
           specify nameserver(s) to use

       biosdevname={0|1}
           turn on/off biosdevname network interface renaming

   NFS
       root=[<server-ip>:]<root-dir>[:<nfs-options>]
           mount nfs share from <server-ip>:/<root-dir>, 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 ":" or "," and are seperated by ",".

       root=nfs:[<server-ip>:]<root-dir>[:<nfs-options>],
       root=nfs4:[<server-ip>:]<root-dir>[:<nfs-options>], root={dhcp|dhcp6}
           root=dhcp alone directs initrd to look at the DHCP root-path where
           NFS options can be specified.
           root-path=<server-ip>:<root-dir>[,<nfs-options>]
           root-path=nfs:<server-ip>:<root-dir>[,<nfs-options>]
           root-path=nfs4:<server-ip>:<root-dir>[,<nfs-options>]

       root=/dev/nfs  nfsroot=[<server-ip>:]<root-dir>[:<nfs-options>]
           Deprecated!  kernel Documentation/filesystems/nfsroot.txt defines
           this method. This is supported by dracut, but not recommended.

       rd.nfs.domain= <NFSv4 domain name>
           Set the NFSv4 domain name. Will overwrite the settings in
           /etc/idmap.conf.

   iSCSI
       root=iscsi:[<username>:<password>[:<reverse>:<password>]@][
       <servername> ]:[ <protocol> ]:[ <port> ]:[ <LUN> ]:<targetname>
           protocol defaults to "6", LUN defaults to "0".

           If the "servername" field is provided by BOOTP or DHCP, then that
           field is used in conjunction with other associated fields to
           contact the boot server in the Boot stage. However, if the
           "servername" field is not provided, then the "targetname" field is
           then used in the Discovery Service stage in conjunction with other
           associated fields.

           See http://tools.ietf.org/html/rfc4173[1].

           e.g.:

               root=iscsi:192.168.50.1::::iqn.2009-06.dracut:target0

           If servername is an IPv6 address, it has to be put in brackets.
           e.g.:

               root=iscsi:[2001:DB8::1]::::iqn.2009-06.dracut:target0

       root=??? netroot=iscsi:[<username>:<password>[:<reverse>:<password>]@][
       <servername> ]:[ <protocol> ]:[ <port> ]:[ <LUN> ]:<targetname> ...
           multiple netroot options allow setting up multiple iscsi disks.
           e.g.:

               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

           If servername is an IPv6 address, it has to be put in brackets.
           e.g.:

               netroot=iscsi:[2001:DB8::1]::::iqn.2009-06.dracut:target0

       root=??? rd.iscsi.initiator=<initiator>  rd.iscsi.target.name=<target
       name>  rd.iscsi.target.ip=<target ip>  rd.iscsi.target.port=<target
       port>  rd.iscsi.target.group=<target group>
       rd.iscsi.username=<username>  rd.iscsi.password=<password>
       rd.iscsi.in.username=<in username>  rd.iscsi.in.password=<in password>
           manually specify all iscsistart parameter (see iscsistart--help)

       root=??? netroot=iscsi rd.iscsi.firmware=1
           will read the iscsi parameter from the BIOS firmware

   FCoE
       fcoe=<edd|interface|MAC>:{dcb|nodcb}
           Try to connect to a FCoE SAN through the NIC specified by
           <interface> or <MAC> or EDD settings. For the second argument,
           currently only nodcb is supported. This parameter can be specified
           multiple times.  Note: letters in the MAC-address must be
           lowercase!

   NBD
       root=nbd:<server>:<port>[:<fstype>][:<mountopts>]
           mount nbd share from <server>

       root=dhcp
           with dhcp root-path=nbd:<server>:<port>[:<fstype>][:<mountopts>]
           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.

   DASD
       rd.dasd_mod.dasd=....
           same syntax as the kernel module parameter (s390 only)

       rd.dasd=<dasd_adaptor device bus
       ID>[,readonly=X][,use_diag=X][,erplog=X]
           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.

   ZFCP
       rd.zfcp=<zfcp adaptor device bus ID>,<WWPN>,<FCPLUN>
           rd.zfcp can be specified multiple times on the kernel command line.
           e.g.:

               rd.zfcp=0.0.4000,0x5005076300C213e9,0x5022000000000000

       rd.zfcp.conf
           ignore zfcp.conf included in the initramfs

   ZNET
       rd.znet=<nettype>,<subchannels>,<options>
           rd.znet can be specified multiple times on the kernel command line.
           e.g.:

               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

   Plymouth Boot Splash
       rd.plymouth=0
           disable the plymouth bootsplash.

   Kernel keys
       masterkey=<kernel master key path name>
           Set the path name of the kernel master key. e.g.:

               masterkey=/etc/keys/kmk-trusted.blob

       masterkeytype=<kernel master key type>
           Set the type of the kernel master key. e.g.:

               masterkeytype=trusted

       evmkey=<EVM key path name>
           Set the path name of the EVM key. e.g.:

               evmkey=/etc/keys/evm-trusted.blob

       ecryptfskey=<eCryptfs key path name>
           Set the path name of the eCryptfs key. e.g.:

               ecryptfskey=/etc/keys/ecryptfs-trusted.blob

   Deprecated, renamed Options
       Here is a list of options, which were used in dracut prior to version
       008, and their new replacement.

       rdbreak
           rd.break

       rd_CCW
           rd.ccw

       rd_DASD_MOD
           rd.dasd_mod.dasd

       rd_DASD
           rd.dasd

       rdinitdebug rdnetdebug
           rd.debug

       rd_NO_DM
           rd.dm=0

       rd_DM_UUID
           rd.dm.uuid

       rdblacklist
           rd.driver.blacklist

       rdinsmodpost
           rd.driver.post

       rdloaddriver
           rd.driver.pre

       rd_NO_FSTAB
           rd.fstab=0

       rdinfo
           rd.info

       check
           rd.live.check

       rdlivedebug
           rd.live.debug

       live_dir
           rd.live.dir

       liveimg
           rd.live.image

       overlay
           rd.live.overlay

       readonly_overlay
           rd.live.overlay.readonly

       reset_overlay
           rd.live.overlay.reset

       live_ram
           rd.live.ram

       rd_NO_CRYPTTAB
           rd.luks.crypttab=0

       rd_LUKS_KEYDEV_UUID
           rd.luks.keydev.uuid

       rd_LUKS_KEYPATH
           rd.luks.keypath

       rd_NO_LUKS
           rd.luks=0

       rd_LUKS_UUID
           rd.luks.uuid

       rd_NO_LVMCONF
           rd.lvm.conf

       rd_LVM_LV
           rd.lvm.lv

       rd_NO_LVM
           rd.lvm=0

       rd_LVM_SNAPSHOT
           rd.lvm.snapshot

       rd_LVM_SNAPSIZE
           rd.lvm.snapsize

       rd_LVM_VG
           rd.lvm.vg

       rd_NO_MDADMCONF
           rd.md.conf=0

       rd_NO_MDIMSM
           rd.md.imsm=0

       rd_NO_MD
           rd.md=0

       rd_MD_UUID
           rd.md.uuid

       rd_NFS_DOMAIN
           rd.nfs.domain

       iscsi_initiator
           rd.iscsi.initiator

       iscsi_target_name
           rd.iscsi.target.name

       iscsi_target_ip
           rd.iscsi.target.ip

       iscsi_target_port
           rd.iscsi.target.port

       iscsi_target_group
           rd.iscsi.target.group

       iscsi_username
           rd.iscsi.username

       iscsi_password
           rd.iscsi.password

       iscsi_in_username
           rd.iscsi.in.username

       iscsi_in_password
           rd.iscsi.in.password

       iscsi_firmware
           rd.iscsi.firmware=0

       rd_NO_PLYMOUTH
           rd.plymouth=0

       rd_retry
           rd.retry

       rdshell
           rd.shell

       rd_NO_SPLASH
           rd.splash

       rdudevdebug
           rd.udev.debug

       rdudevinfo
           rd.udev.info

       rd_NO_ZFCPCONF
           rd.zfcp.conf=0

       rd_ZFCP
           rd.zfcp

       rd_ZNET
           rd.znet

       KEYMAP
           vconsole.keymap

       KEYTABLE
           vconsole.keymap

       SYSFONT
           vconsole.font

       CONTRANS
           vconsole.font.map

       UNIMAP
           vconsole.font.unimap

       UNICODE
           vconsole.unicode

       EXT_KEYMAP
           vconsole.keymap.ext

CONFIGURATION IN THE INITRAMFS

       /etc/conf.d/
           Any files found in /etc/conf.d/ will be sourced in the initramfs to
           set initial values. Command line options will override these values
           set in the configuration files.

       /etc/cmdline
           Can contain additional command line options.

SEE ALSO

       dracut(8) dracut.conf(5)

AUTHOR

       Harald Hoyer <harald@redhat.com>
           Developer

NOTES

        1. http://tools.ietf.org/html/rfc4173
           http://tools.ietf.org/html/rfc4173#section-5