Re: [Xen-users] Installing a domU on NFS

[Dominik Klein <dk@xxxxxxxxxxxxxxxx>]

>   By default the Xen kernel which is installed by "make world && make
>  install" doesn't have NFS_ROOT setup.  Neither do many of the kernels
>  packaged by distributions.  (eg. Debian Etch has a range of Xen kernels
>  but none of them have NFS_ROOT compiled in).
>
>   By happy coincidence I wrote a guide on getting NFS_ROOT working
>  on a Debian machine yesterday evening and it just got published:
>
>         http://www.debian-administration.org/articles/505
So I think I have got everything I need, but it still does not work.

/mnt/etc # cat fstab
10.2.50.21:/xenvm1 / nfs defaults 0 0
proc /proc proc defaults 0 0
sysfs /proc sysfs noauto 0 0
usbfs /proc/bus/usb usbfs noauto 0 0
devpts /dev/pts devpts mode=0620,gid=5 0 0

/etc/xen/vm # cat x-dktest
kernel = '/boot/vmlinuz-2.6.18.2dk2-34-xen'
ramdisk = '/boot/initrd-2.6.18.2dk2-34-xen'
vif = [ 'bridge=xenbr0, ip=10.2.50.41' ]
dhcp = 'off'
netmask = '255.255.255.0'
gateway = '10.2.50.10'
ip = '10.2.50.41'
hostname = 'x-dktest'
root = '/dev/nfs'
nfs_server = '10.2.50.21'
nfs_root = '/xenvm1'
memory = 512
vcpus = 1
builder = 'linux'
name = 'x-dktest'
localtime = 0
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
extra = ' TERM=xterm'

/etc/xen/vm # uname -a
Linux ACD-xen01 2.6.18.2dk2-34-xen #3 SMP Thu Mar 8 16:44:33 CET 2007 
i686 i686 i386 GNU/Linux
/etc/xen/vm # zgrep ROOT_NFS /proc/config.gz
CONFIG_ROOT_NFS=y

/etc/xen/vm # zgrep IP_PNP /proc/config.gz
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_IP_PNP_BOOTP=y
CONFIG_IP_PNP_RARP=y

/etc/xen/vm # ls /mnt/lib/modules/
2.6.18.2-34-default  2.6.18.2-34-xen  2.6.18.2dk2-34-xen  2.6.18.2dk-34-xen

Error Message is this:
NET: Registered protocol family 1
Using IPI No-Shortcut mode
XENBUS: Device with no driver: device/vif/0
Time: xen clocksource has been installed.
IP-Config: Device `eth0' not found.
Freeing unused kernel memory: 200k freed
Boot logging started on /dev/tty1(/dev/console) at Mon Mar 12 07:26:10 2007
Creating device nodes with udev
netfront: Initialising virtual ethernet driver.
Loading xennet
netfront: device eth0 has flipping receive path.
Loading xenblk
Loading jbd
Loading mbcache
Loading ext3
Mounting root 10.2.50.21:/xenvm1
mount server reported tcp not available, falling back to udp
mount: RPC: Remote system error - Network is unreachable
umount: /dev: device is busy
umount: /dev: device is busy
umount: /dev/pts: device is busy
umount: /dev/pts: device is busy
Kernel panic - not syncing: Attempted to kill init!

What I'm curious about is the line "IP-Config: Device `eth0' not found." 
which seems to be a problem. But it is actually attached to the correct 
bridge. See here (this is after booting the vm while it hangs with 
kernel panic):
/etc/xen/vm # xm list
Name                                      ID Mem(MiB) VCPUs State   Time(s)
Domain-0                                   0      511     4 r-----   1519.3
x-dktest                                   9      512     1 r-----    102.6


/etc/xen/vm # brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.000423c0b340       no              vif0.0
                                                        bond0
                                                        vif9.0

/etc/xen/vm # xm network-list 9
Idx BE     MAC Addr.     handle state evt-ch tx-/rx-ring-ref BE-path
0   0  00:16:3e:4c:38:23    0     4      6     520  /521 
/local/domain/0/backend/vif/9/0
Any ideas appreciated.

Thanks in advance,
Dominik

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