Thread: pxe boot with root on nfs fails at startup

for setup pxe server , diskless client followed:
https://help.ubuntu.com/community/disklessubuntuhowto
and
http://www.felipe-alfaro.org/blog/20...skless-ubuntu/

i'm doing dnsmasq. instead of ubuntu-client did use lubuntu installation. did setup first full lubuntu installation on client's harddisk , installation verify dnsmasq issues right ip, can download pxelinux.0 tftp , can mount /nfsroot server without problem.

both server , client use ubuntu-server/lubuntu in version 11.04

when comes startup netboot bootup sequence stops at...

code:

md: ... autorun done. vfs: cannot open root device "(null)" or unknown-block(8,1) please append correct "root=" boot option; here available partitions: kernel panic - not syncing: vfs: unable mount root fs on unknown-block(8,1) pid: 1, comm: swapper not tainted 2.6.38-8-generic #42-ubuntu

(...)

pxelinux.cfg/default looks like:

code:

label linux default vmlinuz-2.6.38-8-generic append root=/dev/nfs initrd=initrd.img-2.6.38-8-generic nfsroot=192.168.2.10:/nfsroot ip=dhcp rw

/etc/exports

code:

/nfsroot        *(rw,no_subtree_check,no_root_squash,async,insecure)

/nfsroot/etc/fstab

code:

proc            /proc           proc    defaults        0       0 /dev/nfs        /               nfs     defaults        0       0 none            /tmp            tmpfs   defaults        0       0 none            /var/run        tmpfs   defaults        0       0 none            /var/lock       tmpfs   defaults        0       0 none            /var/tmp        tmpfs   defaults        0       0 /dev/hdc        /media/cdrom0   udf,iso9660 user,noauto 0       0

searching , trying days... state, kernel not having nfs-options. did change boot=nfs , modules=netboot in /etc/initramfs-tools/initramfs.conf left nfsroot=auto before did execute update-initramfs.

idea how things working this?
if there should missing information, let me know please...

thx,
thomas

for test tried change append line in /tftpboot/pxelinux.cfg/default...
can write whatever want there... still same @ startup. make me thin, append line not correctly processed. added example raid=noautodetect @ startup still "autodetecting raid arrays"... mean

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