From Fedora Project Wiki
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<pre>root=iscsi:[<servername>]:[<protocol>]:[<port>]:[<LUN>]:<targetname>::</pre>
 
<pre>root=iscsi:[<servername>]:[<protocol>]:[<port>]:[<LUN>]:<targetname>::</pre>
{{admon/note|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 (Section 7).  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.[[http://tools.ietf.org/html/rfc4173 RFC4173]]}}
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{{admon/note|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 (Section 7).  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.[http://tools.ietf.org/html/rfc4173 RFC4173]}}
 
<pre>root=??? iscsiroot=...::</pre>
 
<pre>root=??? iscsiroot=...::</pre>
 
<pre>root=??? iscsi_initiator= iscsi_target_name= iscsi_target_ip= iscsi_target_port= iscsi_target_group= iscsi_username= iscsi_password= iscsi_in_username= iscsi_in_password=::</pre>
 
<pre>root=??? iscsi_initiator= iscsi_target_name= iscsi_target_ip= iscsi_target_port= iscsi_target_group= iscsi_username= iscsi_password= iscsi_in_username= iscsi_in_password=::</pre>

Revision as of 15:22, 2 July 2009

Dracut kernel command line parameters

Limitations

  • Command line length: 2048
  • dhcp root-path: 255

Example of usages

  1. FIXME

Configuration in initrd

/conf/conf.d/* 
Note.png
Command line options can override values set here

Standard

init=<path to real init>
root=<path to blockdevice>
Note.png
Specify e.g. /dev/sda1 or /dev/disk/by-path/pci-0000:00:1f.1-scsi-0:0:1:0-part1

DHCP

root=dhcp
Note.png
Get IP from dhcp server, root-path option from dhcp specifies root location.

NFSv3

root=[<server-ip>:]<root-dir>[:<nfs-options>]
Note.png
Mount nfs share from <server-ip>:/<root-dir> If no server-ip is given use dhcp next_server. nfs-options can be appended with the prefix ":" or ","
root=dhcp
Note.png
root-path=<server-ip>:<root-dir>[,<nfs-options>]

Deprecated

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

NFSv4

root=nfs4:[<server-ip>:]<root-dir>[:<nfs-options>]
Note.png
mount nfsv4 share from <server-ip>:/<root-dir>. If no server-ip is given, use dhcp next_server. nfs-options can be appended with the prefix ":" or ","
root=dhcp
Note.png

iSCSI

root=iscsi:[<servername>]:[<protocol>]:[<port>]:[<LUN>]:<targetname>::
Note.png
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 (Section 7). 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.RFC4173
root=??? iscsiroot=...::
root=??? iscsi_initiator= iscsi_target_name= iscsi_target_ip= iscsi_target_port= iscsi_target_group= iscsi_username= iscsi_password= iscsi_in_username= iscsi_in_password=::
root=??? iscsi_firmware::

NBD

root=nbd:<server>:<port>[:<fstype>][:<mountopts>]
Note.png
Mount nbd share from <server>.
root=dhcp
Note.png

Network

ip=[dhcp|on|any]
Note.png
ip=<interface>:[dhcp|on|any]
Note.png
Get ip from dhcp server on a specific interface.
ip=<client-IP-number>:<gateway-IP-number>:<netmask>:<client-hostname>:<interface>:[dhcp|on|any|]
Note.png
Explicit network configuration

Misc

  • rdblacklist=<modulename>
Note.png
TBD: do not load modulename.

Debug ¶

   * rdinitdebug
         o set -x for the dracut shell 
   * rdbreak=[pre-udev|pre-mount|mount|pre-pivot|]
         o drop the shell on defined breakpoint 
   * rdudevinfo
         o set udev to loglevel info 
   * rdudevdebug
         o set udev to loglevel debug 
   * rdnetdebug
         o debug network scripts in dracut