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    The following form allows you to view linux man pages.

    Command:

    dracut

    
    
    

    SYNOPSIS

           dracut [OPTION]... <image>  <kernel-version>
    
    
    

    DESCRIPTION

           dracut  creates  an initial image used by the kernel for preloading the
           block device modules (such as IDE, SCSI or RAID) which  are  needed  to
           access the root filesystem.
    
       Options
           -f, --force
                  overwrite existing initramfs file.
    
           -m, --modules LIST
                  specify  a  space-separated  list of dracut modules to call when
                  building the initramfs.  Modules are located in  /usr/share/dra-
                  cut/modules.d.
    
           -o, --omit LIST
                  omit a space-separated list of dracut modules.
    
           -a, --add LIST
                  add a space-separated list of dracut modules.
    
           -d, --drivers LIST
                  specify  a space-separated list of kernel modules to exclusively
                  include in the initramfs.  The kernel modules have to be  speci-
                  fied without the ".ko" suffix.
    
           --add-drivers LIST
                  specify  a  space-separated list of kernel modules to add to the
                  initramfs.  The kernel modules have to be specified without  the
                  ".ko" suffix.
    
           --omit-drivers LIST
                  specify  a  space-separated  list of kernel modules to omit from
                  the initramfs.  The kernel modules have to be specified  without
                  the  ".ko"  suffix.   Regular  expressions are also allowed like
                  ".*/fs/ocfs/.*".
    
                  If [LIST] has multiple arguments, then you have to put these  in
                  quotes.
    
                  example: # dracut --omit "module1 module2"  ...
    
           --filesystems LIST
                  specify  a  space-separated list of kernel filesystem modules to
                  exclusively include in the generic initramfs.
    
           -k, --kmoddir {DIR}
                  specify the directory, where to look for kernel modules
                  do not include local /etc/mdadm.conf
    
           --strip
                  strip binaries in the initramfs (default)
    
           --nostrip
                  do not strip binaries in the initramfs
    
           -h, --help
                  display help text and exit.
    
           --debug
                  output debug information of the build process
    
           -v, --verbose
                  verbose output during the build process
    
           -c, --conf FILE
                  specify configuration file to use.  Default: /etc/dracut.conf
    
           --confdir DIR
                  specify configuration  directory  to  use.   Default:  /etc/dra-
                  cut.conf.d
    
           -l, --local
                  local  mode.  Use  modules  from  the  current working directory
                  instead of the system-wide installed  in  /usr/share/dracut/mod-
                  ules.d.  Useful when running dracut from a git checkout.
    
           -H, --hostonly
                  Host-Only  mode:  Install  only  what  is needed for booting the
                  local host instead of a generic host.
    
           -i, --include SOURCE TARGET
                  include the files in the SOURCE directory into the target direc-
                  tory in the final initramfs.
    
           -I, --install LIST
                  install the space separated list of files into the initramfs.
    
    
    

    KERNEL COMMAND LINE

           The root filesystem used by the kernel is specified in the boot config-
           uration file, as always. The traditional  root=/dev/hda1  style  device
           specification is allowed. If a label is used, as in root=LABEL=rootPart
           the initrd 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
                  mount options and mounted accordingly.
    
           rootfallback=<path to blockdevice>
                  specify  the  block device to use as the root filesystem, if the
                  normal root cannot be found. This can only  be  a  simple  block
                  device  with  a  simple  file  system,  for which the filesystem
                  driver  is  either  compiled  in,  or  added  manually  to   the
                  initramfs. This parameter can be specified multiple times.
    
           rd_NO_FSTAB
                  do not honor special mount options for the root filesystem found
                  in /etc/fstab of the real root.
    
       Misc
           hostname=<hostname>
                  set the initial hostname
    
           rdblacklist=<drivername>
                  do not load kernel module <drivername>  This  parameter  can  be
                  specified multiple times.
    
           rdloaddriver=<drivername>
                  force  loading  kernel module <drivername> This parameter can be
                  specified multiple times.
    
           rd_retry=<seconds>
                  wait <seconds> until dracut tries to force assemble LVM or  RAID
                  volumes. If the root device is not found within <seconds>*2 then
                  dracut fails and either drops to a shell, if rdshell is  on  the
                  kernel  command  line,  or exits with 1, which normally causes a
                  kernel panic.
    
                  Default: rd_retry=40
    
       Debug
           rdinfo print informational output though "quiet" is set
    
           rdshell
                  allow dropping to a shell, if root mounting fails
    
           rdinitdebug
                  set -x for the dracut shell  and  logs  to  dmesg,  console  and
                  /init.log
    
           rdbreak
                  drop to a shell at the end
    
           rdbreak={cmdline|pre-udev|pre-trigger|initqueue|pre-mount|mount |pre-
           pivot}
                  drop to a shell on defined breakpoint
    
           KEYBOARDTYPE=sun|pc
                  will be written to /etc/sysconfig/keyboard in the initramfs
    
           KEYTABLE=<keytable filename>
                  will be written to /etc/sysconfig/keyboard in the initramfs
    
           SYSFONT=Console font
                  will be written to /etc/sysconfig/i18n in the initramfs
    
           SYSFONTACM=Unicode font map
                  will be written to /etc/sysconfig/i18n in the initramfs
    
           UNIMAP=Unicode font map
                  will be written to /etc/sysconfig/i18n in the initramfs
    
           LANG=<locale>
                  will be written to /etc/sysconfig/i18n in the initramfs
    
       LVM
           rd_NO_LVM
                  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_NO_LVMCONF
                  remove any /etc/lvm/lvm.conf, which may exist in the initramfs
    
       crypto LUKS
           rd_NO_LUKS
                  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_NO_CRYPTTAB
                  do not check, if LUKS partition is in /etc/crypttab
    
       MD
           rd_NO_MD
           rd_NO_DM
                  disable DM RAID detection
    
           rd_DM_UUID=<dmraid uuid>
                  only activate the raid sets with the given UUID.  This parameter
                  can be specified multiple times.
    
       MULTIPATH
           rd_NO_MULTIPATH
                  disable multipath in the initramfs
    
       FIPS
           fips=1 enable FIPS
    
           boot=<bootdevice>
                  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>
    
                  If the root device is encrypted, the /boot partition must reside
                  on a seperate partition and has to be specified.
    
       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  inter-
                  face  auto6:  do  IPv6  autoconfiguration  This parameter can be
                  specified multiple times.
    
           ip=<client-IP>:[<server-id>]:<gateway-IP>:<netmask>:<clienthostname>
           :<interface>:{none|off}
                  explicit network configuration. If you want  do  define  a  IPv6
                  address,  put it in brackets (e.g. [2001:DB8::1]).  This parame-
                  ter can be specified multiple times.
    
           vlan=<vlanname>:<phydevice>
                  Setup vlan device named <vlanname> on <phydeivce>.
                   We  support  the  four  styles  of  vlan  names:  VLAN_PLUS_VID
                  (vlan0005),     VLAN_PLUS_VID_NO_PAD    (vlan5),    DEV_PLUS_VID
                  (eth0.0005), DEV_PLUS_VID_NO_PAD (eth0.5)
    
           bridge=<bridgename>:<ethnames>
                  Setup bridge  <bridgename>  with  <ethnames>.  <ethnames>  is  a
                  comma-separated  list  of physical (ethernet) interfaces. Bridge
                  without parameters assumes bridge=br0:eth0
    
           bond=<bondname>[:<bondslaves>:[:<options>]]
                  Setup bonding device <bondname> on top of  <bondslaves>.  <bond-
                  slaves>  is a comma-separated list of physical (ethernet) inter-
                  faces. <options> is a comma-separated list  on  bonding  options
                  (modinfo   bonding   for  details)  in  format  compatible  with
                  initscripts. If <options>  includes  multi-valued  arp_ip_target
                  option,  then  its values should be separated by semicolon. Bond
                  without parameters assumes bond=bond0:eth0,eth1:mode=balance-rr
    
           biosdevname={0|1]}
                  turn off/on 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>]
           root=iscsi:[username:password[:reverse:password]@][<servername>]
           :[<protocol>]:[<port>][:[<iscsi_iface_name>]:[<netdev_name>]]:[<LUN>]
           :<targetname>
                  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>][:[<iscsi_iface_name>]:[<net-
           dev_name>]]:[<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=??? iscsi_initiator=<initiator> iscsi_target_name=<target name>
           iscsi_target_ip=<target ip> iscsi_target_port=<target port>
           iscsi_target_group=<target group> iscsi_username=<username>
           iscsi_password=<password> iscsi_in_username=<in username>
           iscsi_in_password=<in password>
                  manually  specify  all   iscsistart   parameter   (see   iscsis-
                  tart --help)
    
           root=??? netroot=iscsi iscsi_firmware
                  will read the iscsi parameter from the BIOS firmware
    
           iscsi_param=<param>
                  <param> will be passed as "--param <param>" to iscsistart.  This
                  parameter can be specified multiple times.
                   e.g.:
                     "netroot=iscsi      iscsi_firmware      iscsi_param=node.ses-
                  sion.timeo.replacement_timeout=30"
                     will result in
                     iscsistart  -b  --param  node.session.timeo.replacement_time-
                  out=30
    
       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.  This parameter can be
                  specified multiple times.
    
       DASD
           rd_DASD_MOD=....
                  same syntax as the kernel module parameter (s390 only)
    
           rd_DASD=<dasd adaptor device bus ID>[,readonly=X][,use_diag=X]
           [,erplog=X][,failfast=X]
                  activate DASD device with the given adaptor device  bus  ID  and
                  setting the sysfs attributes to the specified values This param-
                  eter 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.
    
                  example: rd_ZFCP=0.0.4000,0x5005076300C213e9,0x5022000000000000
    
           rd_NO_ZFCPCONF
                  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. Examples:
                      rd_ZNET=qeth,0.0.0600,0.0.0601,0.0.0602,layer2=1,port-
                  name=foo
                      rd_ZNET=ctc,0.0.0600,0.0.0601,0.0.0602,protocol=bar
    
       Plymouth Boot Splash
           rd_NO_PLYMOUTH
                  do  not start plymouth. This will not work with encrypted parti-
                  tions.
    
    
    

    FILES

           /var/log/dracut.log
    
           /etc/dracut.conf
                  see dracut.conf(5)
    
       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.conf(5)
    
    
    

    Linux June 2009 DRACUT(8)

    
    
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