Question

1

Casper set hostname via dhcp

rated 0 times [ 1] [ 0] / answers: 1 / hits: 1476 / 3 Years ago, sun, august 22, 2021, 11:56:42

I'm booting sucessfull via pxeboot a live ubuntu remix. I wan't to set the hostname via dhcp because I'm booting several instances of the same image. Right now I'm using a hookline in /etc/dhcp/dhclient-enter-hooks.d/pinhostname that works quite well.

RUN="yes"

if [ "$RUN" = "yes" ]; then

var=`/sbin/ifconfig eth0 | /usr/bin/awk '/inet addr/ {print $2}' | /usr/bin/cut -f2 -d:`

var=`/usr/bin/dig -x $var +short`

var=`echo $var | /usr/bin/awk -F. '{print $1}'`

/bin/hostname $var

fi

But the dhcp server comes to late for munin etc and the hostname is not set in time. In the Casper log it shows me it receives the hostname much earlier:

IP-Config: eth0 hardware address 08:00:27:86:3e:84 mtu 1500 DHCP RARP

IP-Config: eth0 complete (from 10.1.1.1):

address: 10.1.1.10        broadcast: 10.1.1.255       netmask: 255.255.255.0

gateway: 10.1.1.1         dns0     : 10.1.1.1         dns1   : 0.0.0.0

host   : storage1

domain : domain.com

rootserver: 10.1.1.1 rootpath:

filename  : pxelinux.0

How can I set that host name. I think I need to put a script in /scripts before I pack the initrd. There a loads of different scripts where would I put mine?
Thank you for your time

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initiallartebeest

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3 Years ago

answered 3 Years ago nuehan · Accepted Answer

I found a ugly hack that works for me. I unpacked the initrd inserted

cat /root/var/log/netboot.config | awk /HOSTNAME/ | cut -f2 -d= | sed 's/.(.*)./1/' > /root/etc/hostname

HOST=`cat /root/var/log/netboot.config | awk /HOSTNAME/ | cut -f2 -d= | sed 's/.(.*)./1/'`

hostname "$HOST"

in /initrd_temp/scripts/casper-bottom/23networking somewhere after this line:

cp /tmp/net-"${DEVICE}".conf /root/var/log/netboot.config

Beware this IS ugly. This probably should go in 18hostname - but maybe network devices are not up yet.