Hi Mika,

Thank you for your update!

No worries, I get the situation. I'm happy that you guys decided to still pick up this 
old request :)

If you have any suggestions at all regarding the pull request, don't hesitate to put 
comments on GitHub.

Best regards,
Laurens

Hi!

Thanks for pinging us, what a shame we didn't provide any further feedback,
sorry about that. :(
Sadly this issue was assigned to someone who no longer is active in the Grml
team, we'll try to take care of it ASAP. Your patch in
https://github.com/grml/live-boot-grml/pull/4 LGTM, I'll talk to Evgeni who
takes care of our live-boot-grml to get it merged.

regards,
Mika

Any chance someone would be willing to have a look at this issue? I realize the 
reauest is quite old, however the issue is still relevant.

Earlier on I created a pull request with a possible patch;

https://github.com/grml/live-boot-grml/pull/4

Please do provide constructive feedback if I got that patch wrong.

Maybe try to do like this (according https://github.com/grml/live-boot-
grml/blob/master/debian/patches/26_support_dns_bootoption.patch):
1) +++ live-boot-grml/scripts/boot/9990-cmdline-old
leave only:
+dns=*)
+DNSSERVERS="${_PARAMETER#*=}"
+export DNSSERVERS
;;
2) in +++ live-boot-grml/scripts/boot/9990-grml-networking.sh make:
+# dns bootoption
+if [ -n "$DNSSERVERS" ]
+then
+	# disable any existing entries
+	if [ -r $RESOLVCONF ]
+	then
+		sed -i 's/nameserver/# nameserver/' $RESOLVCONF
+	fi
+       DNSSERVERS=`echo $DNSSERVERS| sed 's/,/ /g'`
+	for i in $DNSSERVERS
+	do
+		echo "nameserver $i" >> $RESOLVCONF
+	done
+fi
+

The fault is in package "live-boot-grml" ( https://github.com/grml/live-boot-grml 
).
Files:
* /scripts/boot/9990-networking.sh
* debian/patches/26_support_dns_bootoption.patch

Actually our kernel patch supports only two dns servers not three.
I will test a solution/fix to improve the feature to support three dns servers.

If you have a solution, too... welcome and send us a patch. :D

Trying to set more than 2 DNS in the dns bootoption:
dns=1.1.1.1,2.2.2.2,3.3.3.3
expecting:
cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 1.1.1.1
nameserver 2.2.2.2
nameserver 3.3.3.3

Current result:
cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 1.1.1.1,2.2.2.2
nameserver 2.2.2.2,3.3.3.3