NFS 𤷤롼ȥե륷ƥΥޥ (nfsroot)
======================================================

    ԡGero Kuhlmann <gero@gkminix.han.de>, 1996 ǯ
    Martin Mares <mj@atrey.karlin.mff.cuni.cz>, 1997 ǯ
ܸܹ <hng@ps.ksky.ne.jp>



ǥ쥹ƥ X üץȥФʤɤ˻Ȥʤ顢ǥ
ǤϤʤǥХ˥롼ȥե륷ƥ֤ʤФʤޤ
ϥǥ (˾ܤϤΥǥ쥯ȥˤ
initrd.txt 򻲾ȤƤ [ܸ
http://www.linux.or.jp/JF/JFdocs/kernel-docs-2.2/initrd.txt.html
ˤޤ]) NFS 𤷥ե륷ƥޥȤ뤫Τɤ餫
ǲǽǤλǤϡ֥饤ȡפϥǥ쥹ƥ
֥Сפ NFS Ф򡢰̣ޤ




1.) nfsroot ǽͭˤ
    ------------------------

nfsroot Ѥˤϡͥ륳ե졼 NFS Υݡ
Ȥ򤷤ʤФʤޤ󡣤ξ NFS ⥸塼Ȥƥ
ǤʤȤդƤθ塢ե졼󥹥ץ
 nfsroot Ѥ줬 yes ʤɤ auto configuration 
ƥѤҤͤƤޤDHCP/BOOTP  RARP ξ
ᤷޤ




2.) ͥ륳ޥɥ饤
    ----------------------

ͥ뤬֡ȥ (loadlin, LILO, ͥåȥ֡ȥץ
줫) ˤɤ줿硢ͥϤɤΥǥХ롼 fs 
ѤΤȡ롼ȤȤƥޥȤ륵ФξꤪӥоΥǥ
쥯ȥ̾ʤФʤޤ󡣤󻰤Υͥ륳ޥɥ
ΰǤޤ -


root=/dev/nfs

  ϲ NFS ǥХͭˤ뤿ɬפǤϼ¥ǥХ
  ǤϤʤ¥ǥХ NFS Ѥ褦ͥ뤳
  Ȥñ˰̣ޤ


nfsroot=[<server-ip>:]<root-dir>[,<nfs-options>]

  nfsroot ޥɥ饤Ϳʤä硢ͤ
  "/tftpboot/%s" Ѥޤ

  <server-ip>   NFS Ф IP ɥ쥹ꤷޤΥեɤ
                Ϳʤ硢ip ѿ (ʲ򻲾ȤƤ) 
                Υɥ쥹Ѥޤΰ
                ѤΤΰĤȤơRARP  NFS ǰۤʤ륵
                Ѥ㤬ޤ̾盧ϥ֥󥯤Ǥ

                롼ȤȤƥޥȤ륵оΥǥ쥯ȥ̾ʸ
                 "%s" ȡ󤬤硢ȡϥ饤
                 IP ɥ쥹 ASCII ɽ֤ޤ

  <nfs-options>	ɸŪ NFS ץ󡣤٤ƤΥץϥޤ
                ڤޤץեɤͿʤ硢
                δͤѤޤ -
                        port            = Ф portmap ǡ
                                          Ϳޤ
                        rsize           = 1024
                        wsize           = 1024
                        timeo           = 7
                        retrans         = 3
                        acregmin        = 3
                        acregmax        = 60
                        acdirmin        = 30
                        acdirmax        = 60
                        flags           = hard, nointr, noposix, cto, ac


ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>

  ΰϡǥХ IP ɥ쥹ˡ IP 롼ƥ
  ơ֥ˡ򥫡ͥޤϸ nfsaddrs ȸƤ
  ƤޤǤϥ֡Ȼ IP  NFS ȴطʤư
  ǡip ˲̾ޤޤŤ̾ϸߴͳ̾Ȥ
  Ĥޤ

  ΰͥ륳ޥɥ饤̵硢եɤϤ٤ƶ
  Ȳꤵ졢˽Ҥ٤ͤѤޤξϰŪˡ
  ͥ RARP  DHCP/BOOTP ξѤơ٤Ƥ򤷤褦
  Ȥޤ (ͥ륳ե졼ǲͭˤʤäƤ뤫˰¸
  ξץȥΤǽΤäΤѤޤ)

  <client-ip>   饤Ȥ IP ɥ쥹ξ硢ɥ쥹 RARP
                 DHCP/BOOTP Τɤ餫ǷޤɤΥץȥ
                Ѥ뤫ϥͥ륳ե졼ǲͭ
                ˤʤäƤ뤫ȡ<autoconf> ˰¸ޤ
                Ǥʤ硢RARP  DHCP/BOOTP Ѥ
                

  <server-ip>   NFS Ф IP ɥ쥹RARP 饤ȥɥ쥹
                뤿˻Ѥ졢ΰǤʤΤߡ
                ꤵ줿ФαդޤRARP 
                NFS ǰۤʤ륵ФѤˤϡ RARP Ф
                 (뤤ϥ֥󥯤Τޤ) nfsroot  NFS
                Фꤷޤ (嵭򻲾ȤƤ)Υ
                ȥ꤬֥󥯤ξ硢ФΥɥ쥹 RARP 
                DHCP/BOOTP αΥХɥ쥹Ѥޤ
                (DHCP/BOOTP мΤǤϤʤȤդƤ)

  <gw-ip>       Фۤʤ륵֥ͥåȾˤΥȥ IP
                ɥ쥹Υȥ꤬ǡDHCP/BOOTP αˤ
                ʤ硢ȥϻѤ줺Фϥ
                ͥåȥˤȲꤵޤ

  <netmask>     ͥåȥ󥿡եѥͥåȥޥ
                줬ǡDHCP/BOOTP αˤʤ硢ͥ
                ȥޥϥ饤 IP ɥ쥹Ƴ졢Υ
                ΤΥɥ쥹ȤΤȲꤵޤ

  <hostname>    饤̾ǡDHCP/BOOTP αˤ
                ʤ硢饤 IP ɥ쥹 ASCII ˡ
                ޤ

  <device>      ѤͥåȥǥХ̾줬ξ硢٤
                ΥǥХ RARP  BOOTP ׵Ѥ˻Ѥ졢
                ˱äǥХꤵޤĤΥǥХ
                ʤ硢֥󥯤ΤޤޤǤ

  <autoconf>    autoconfiguration Ѥ˻Ѥˡ줬 'dhcp',
                'bootp', 'rarp' Τ줫ʤ顢ꤵ줿ץȥ뤬
                Ѥޤͤ 'both' ξ硢BOOTP 
                RARP ͥ˹ƤСξѤ
                ޤ (ߴѤˡBOOTP Ƥʤ¤ꡢDHCP
                ϤξѤޤ)ͤ 'off' ξ硢ɤʼ
                 autoconfiguration Ԥޤ

  <autoconf>  autoconfiguration Ѥ硢ip 
  ˴ޤޤʤƤ⤤褦Ǥ (ʸ ':' ɬפޤ)




3.) ͥ
    --------------

˥ͥˤϡĤΰۤʤˡѤǤޤ
ϤɤλȤߤѲǽ˰¸ޤ -


3.1) dd Ѥեåԡ˥ͥ񤭹 -
       ĤΤ褦ˡdd Ѥեåԡ˥ͥ񤭹ޤ
       ˤƤ⥫ͥ륳ޥɥ饤Ѥ뤳ȤϤǤޤ
       'root=' Ѥˡmknod Ѥ᥸㡼ֹ 0, ޥʡ
        255 ΥߡǥХǤդ Linux ƥ˺ޤ -

                mknod /dev/boot255 c 0 255

         dd Ѥեåԡ˥ͥ zImage ե򥳥ԡ
        ޤ -

                dd if=/usr/src/linux/arch/i386/boot/zImage of=/dev/fd0

        Ǹˡ롼ȥǥХꤹ뤿 rdev Ѥޤ -

                rdev /dev/fd0 /dev/boot255

        θ塢ߡǥХ /dev/boot255 Ǥޤϻ
        ǽʼ¥ǥХǤϤʤΤǡ

        ¾ĤΥͥ륳ޥɥ饤ѥ᡼ rdev ѤǤ
        󡣤äƤˡѤ硢ͥ DHCP/BOOTP 
        RARP ͤǻѤRARP 𤷤硢Υ롼
        Ȥƥǥ쥯ȥ /tftpboot/<client-ip>/ ޥȤޤ
        DHCP/BOOTP 硢Υǥ쥯ȥ̾
        Ѥޤ


3.2) LILO λ
        LILO Ѥ硢ɬפʥޥɥ饤ѥ᡼ LILO 
        ե 'append=' ޥɤǤ٤ƻǤޤ
        ʤ顢'root=' ޥɤѤˤϡ嵭 3.1 ǽҤ٤
        褦˥ߡǥХ򤳤ǤꤹɬפޤLILO 
        Ӥ 'append=' ޥɤλˡ LILO λ򻲾ȤƤ
        

3.3) loadlin λ
        롼ȤȤƥޥȤϡɥǥˡDOS
        ޥɥץץȤ Linux ֡Ȥ硢loadlin 
        ѤǤޤưʹƤޤ伫ȤޤѤ
        Ȥޤ󡣰Ū LILO ԤˡƱͤˡ
        ͥ륳ޥɥ饤κǽʤϤǤܤ loadlin
        λ򻲾ȤƤ

3.4) ֡ ROM λ
        Ϥ֤ǥ쥹饤ȤưǤʤˡ
        ֡ ROM ˤꡢͥ TFTP ץȥѤƥ
        ɤޤ䤬Τ¤ꡢͥåȥ Linux Υ֡Ȥ
        ݡȤ뾦ѥ֡ ROM Ϥޤޤ󤬡ե꡼Υ֡
        ROM μĤꡢsunsite.unc.edu ӤΥߥ顼Ȥ
        Ǥޤ 'netboot-nfs'  'etherboot' ȸ
        ФޤξȤǥ쥹 Linux 饤ȤΥ֡Ȥɬ
        פʤΤ٤ƤޤǤޤ




4.) ռ
    ----

  ͥ nfsroot ɤ RARP ݡȤ
  Kuhlmann<gero@gkminix.han.de> ˤ񤫤ޤ

  IP ؤ autoconfiguration ɤ
  Martin Mares <mj@atrey.karlin.mff.cuni.cz> ˤ񤫤ޤ

  nfsroot νǤ񤯤ˡٱ礷Ƥ줿
  Jens-Uwe Mager <jum@anubis.han.de> ˴դޤ
