Bug 677254

Summary:	booting with nfsroot doesn't work over nfsv3 - mkinitrd doesn't include /etc/netconfig+/etc/protocols
Product:	[openSUSE] openSUSE 11.4	Reporter:	Per Jessen <per>
Component:	Kernel	Assignee:	Michal Marek <mmarek>
Status:	RESOLVED FIXED	QA Contact:	E-mail List <qa-bugs>
Severity:	Normal
Priority:	P5 - None	CC:	pmarques
Version:	Factory
Target Milestone:	---
Hardware:	x86-64
OS:	Other
Whiteboard:
Found By:	---	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description Per Jessen 2011-03-06 15:18:07 UTC

User-Agent:       Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-GB; rv:1.9.2.10) Gecko/20100914 Firefox/3.6.10

I'm setting up a number of diskless boxes for booting over PXE with nfsroot. As far as I can tell, NFSv4 doesn't work for nfsroot (something about idmapd not being able to run early enough), so I force my clients to use nfsv3. 
With this however, I keep seeing mount.nfs report "Protocol not supported".  

After some debugging, I determined that /etc/protocols and /etc/netconfig were required for mount.nfs to work.  My initrd was built with features nfs and network, but when I added those two files, my nfsroot finally worked.

Reproducible: Always

Comment 1 Paulo Marques 2011-04-16 23:08:53 UTC

I can confirm that I had the exact same problem with x86-32 too.

To fix it, I did on the nfs server, as root:

# cd <exported directory for the client's home>
# chroot .
# cd /boot
# mkdir img
# cd img
# gzip -cd /boot/initrd | cpio -imd --quiet
# cp /etc/{protocols,netconfig} etc
# find . | cpio --quiet -H newc -o | gzip -9 -n > /boot/initrd_patched
# cd /boot
# rm initrd
# ln -s initrd_patched initrd
# exit

Maybe these instructions will work as a temporary workaround for people hitting the same problem.

NOTE: I just wrote these instructions here, so maybe I missed something. Don't miss the "chroot ." line or you'll be doing changes to the boot directory of your server!

Comment 2 Per Jessen 2012-06-22 09:48:44 UTC

(In reply to comment #0)
> User-Agent:       Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-GB; rv:1.9.2.10)
> Gecko/20100914 Firefox/3.6.10
> 
> I'm setting up a number of diskless boxes for booting over PXE with nfsroot. As
> far as I can tell, NFSv4 doesn't work for nfsroot (something about idmapd not
> being able to run early enough), so I force my clients to use nfsv3. 
> With this however, I keep seeing mount.nfs report "Protocol not supported".  
> 
> After some debugging, I determined that /etc/protocols and /etc/netconfig were
> required for mount.nfs to work.  My initrd was built with features nfs and
> network, but when I added those two files, my nfsroot finally worked.

Update - on a Factory (12.2 beta2) install/update just yesterday, I had to rebuild the initrd anyway, and /etc/protocols and /etc/netconfig are now included correctly.  As far as I'm concerned, that means the problem is solved.