Re: Support for kernel parameter NIC= in LTSP5 on Ubuntu?

Thanks for the pointer. I made a new version that uses the IPAPPEND
parameter in pxelinux.cfg like this:

----------------------------------------------------------
DEFAULT vmlinuz ro initrd=initrd.img
IPAPPEND 2
----------------------------------------------------------

Then I added a script in initrd to write the BOOTIF parameter
to /etc/udev/rules.d/70-persistent-net.rules udev takes then care of
assigning the correct interface name using the mac address. The hook
script copies the udev scripts to assign names to the other devices udev
finds. I tried getting udev to ignore the other devices with
"ignore_device" option, but couldn't get it working for some reason. If
some udev option ignores all but the defined mac, this could be made
simpler.

I don't have any of the problem boxes here right now but with this I was
able to assign the interface name to eth1 or anything else I wanted.

All testing was done on Ubuntu Hardy.

--------> /usr/share/initramfs-tools/hooks/pxe <---------
#! /bin/sh -e

. /usr/share/initramfs-tools/hook-functions

mkdir -p ${DESTDIR}/lib/udev
mkdir -p ${DESTDIR}/etc/udev/rules.d

copy_exec /lib/udev/write_net_rules /lib/udev/
cp /lib/udev/rule_generator.functions ${DESTDIR}/lib/udev
cp /etc/udev/rules.d/75-persistent-net-generator.rules
${DESTDIR}/etc/udev/rules.d/

exit 0
--------> /usr/share/initramfs-tools/hooks/pxe <---------

--------> /usr/share/initramfs-tools/scripts/init-top/pxe <---------
#!/bin/sh

. /scripts/functions

for x in $(cat /proc/cmdline); do
        case $x in
        BOOTIF=*)
                BOOTIF=${x#BOOTIF=}
                ;;
        esac
done

if [ -n "${BOOTIF}" ]; then
        log_begin_msg "Setting MAC for eth0 (BOOTIF=${BOOTIF})..."

        MAC=`echo -n ${BOOTIF} | sed "s/\(..\)-\(.*\)/\2/" | sed
"s/-/:/g"`
        echo "SUBSYSTEM==\"net\", ACTION==\"add\", DRIVERS==\"?*\",
ATTR{address}==\"${MAC}\", ATTR{type}==\"1\", KERNEL==\"eth*\", NAME=
\"eth0\"" > /etc/udev/rules.d/70-persistent-net.rules

        log_end_msg
fi
--------> /usr/share/initramfs-tools/scripts/init-top/pxe <---------

Veli-Matti Lintu

to, 2009-02-26 kello 17:01 +0200, Άλκης Γεωργόπουλος kirjoitti:
> I think the place to start would be here:
> http://syslinux.zytor.com/wiki/index.php/SYSLINUX#IPAPPEND_flag_val_.5BPXELINUX_only.5D
> 
> By using IPAPPEND 2 in pxelinux.cfg/default, pxelinux passes the boot
> interface (= the one that requested a dhcp address) as a kernel
> parameter (BOOTIF).
> Then an init script can pick up the mac-address in BOOTIF, match it
> against the list of available interfaces and select the correct one to
> pass to ipconfig or whatever else is used.
> 
> I can't think of any reason why this shouldn't be default behavior (if
> BOOTIF is defined, that is). Yup, I know, initrds etc are distro
> specific... :(
> 
> Alkis Georgopoulos
> 
> --------Αρχικό Μήνυμα --------
> Από: Veli-Matti Lintu <[email protected]>
> 
> LTSP 4.2 used to support kernel parameter NIC= to load specified module
> for a nic as specified here:
> 
> http://wiki.ltsp.org/twiki/bin/view/Ltsp/KernelOptions
> 
> <snip>



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