Xen users - Apr 2006 - mount: unknown filesystem type ''devfs''

Hi everyone!

I recently start using xen. I have compiled it and installed in a Dell 
PowerEdge 2800 Debian Linux box. The dom0 boots ok but i have been 
experimenting some problems with a LVM2-root domU similar to the one 
reported in 
http://lists.xensource.com/archives/html/xen-users/2006-03/msg00678.html 
but i found no way to make it work.

here is may xen-dom1.cf file:

kernel = "/boot/vmlinuz-2.6.12-xenU"
ramdisk = "/boot/initrd.img-2.6.12-xenU"
disk = [ ''phy:data/Dom1-root,sda1,w'' ]
root = "/dev/sda2 ro"
extra = "4"

and here is what i got:

mount: unknown filesystem type ''devfs''
SCSI subsystem initialized
register_blkdev: cannot get major 8 for sd
umount: devfs: not mounted
mount: unknown filesystem type ''devfs''
umount: devfs: not mounted
pivot_root: No such file or directory
/sbin/init: 432: cannot open dev/console: No such file
Kernel panic - not syncing: Attempted to kill init!

Please, can anybody tellme where is the mistake and who to fix it?

Regards,
Ernesto

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Ernesto Rodriguez Reina schrieb:
> [..]
> mount: unknown filesystem type ''devfs''
> SCSI subsystem initialized
> register_blkdev: cannot get major 8 for sd
> umount: devfs: not mounted
> mount: unknown filesystem type ''devfs''
> umount: devfs: not mounted
> pivot_root: No such file or directory
> /sbin/init: 432: cannot open dev/console: No such file
> Kernel panic - not syncing: Attempted to kill init!
Do you use the default kernel images that came with XEN? If so, they
don''t include devfs support and so a standard debian initrd
won''t work,
as it is heavily based on devfs.
I get very good results using yaird as initrd toolkit. There are
backports available for sarge, have a look at http://www.backports.org/.

Greetings,
Markus


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Markus Schuster wrote:
>Ernesto Rodriguez Reina schrieb:
>  
>
>>[..]
>>mount: unknown filesystem type ''devfs''
>>SCSI subsystem initialized
>>register_blkdev: cannot get major 8 for sd
>>umount: devfs: not mounted
>>mount: unknown filesystem type ''devfs''
>>umount: devfs: not mounted
>>pivot_root: No such file or directory
>>/sbin/init: 432: cannot open dev/console: No such file
>>Kernel panic - not syncing: Attempted to kill init!
>>    
>>
>
>Do you use the default kernel images that came with XEN? If so, they
>don''t include devfs support and so a standard debian initrd
won''t work,
>as it is heavily based on devfs.
>I get very good results using yaird as initrd toolkit. There are
>backports available for sarge, have a look at http://www.backports.org/.
>
>Greetings,
>Markus
>  
>
>------------------------------------------------------------------------
>
>_______________________________________________
>Xen-users mailing list
>Xen-users@lists.xensource.com
>http://lists.xensource.com/xen-users
>
Hi again, thanks for answering i tried yaird and i got an error again:

megaraid: 2.20.4.5 (Release Date: Thu Feb 03 12:27:22 EST 2005)
register_blkdev: cannot get major 8 for sd
/bin/cat: /sys/block/sda/dev: No such file or directory
Waiting 1 seconds for /sys/block/sda/dev to show up
/bin/cat: /sys/block/sda/dev: No such file or directory
Waiting 2 seconds for /sys/block/sda/dev to show up
/bin/cat: /sys/block/sda/dev: No such file or directory
Waiting 4 seconds for /sys/block/sda/dev to show up
/bin/cat: /sys/block/sda/dev: No such file or directory
Waiting 8 seconds for /sys/block/sda/dev to show up
/bin/cat: /sys/block/sda/dev: No such file or directory
Waiting 16 seconds for /sys/block/sda/dev to show up
/bin/cat: /sys/block/sda/dev: No such file or directory
Device /sys/block/sda/dev seems to be down.

I  also try to use lvm2create_initrd and then got:

RAMDISK: ext2 filesystem found at block 0
RAMDISK: Loading 3368KiB [1 disk] into ram disk... done.
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 188k freed
Kernel panic - not syncing: No init found.  Try passing init= option to 
kernel.

I have tried both Xen and XenU kernel but i always got a kernel panic.

Any ideas?

Does someone built xen from source and make work a lvm2-root domU?

Regards,
Ernesto


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Eernesto,

I''m using lvm2 volumes , on debian sarge, in all domU''s. No
problem with
that. You might want to check out your xen-dom1.cf again.

Your root entry points to /dev/sda2 but you are exporting sda1 to your 
domU. Also make sure your /etc/fstab in the domU is correct.

I think yous should have something like this in xen-dom1.cf

kernel = "/boot/vmlinuz-2.6.12-xenU"
ramdisk = "/boot/initrd.img-2.6.12-xenU"
disk = [ ''phy:data/Dom1-root,sda1,w'' ]
root = "/dev/sda1 ro"
extra = "4"

and  in /etc/fstab in the domU something like

/dev/sda1     /     ext3     errors=remount-ro   0     1

Regards,
Jan-Petter ::-Q

Ernesto Rodriguez Reina wrote:
> Hi everyone!
>
> I recently start using xen. I have compiled it and installed in a Dell 
> PowerEdge 2800 Debian Linux box. The dom0 boots ok but i have been 
> experimenting some problems with a LVM2-root domU similar to the one 
> reported in 
> http://lists.xensource.com/archives/html/xen-users/2006-03/msg00678.html 
> but i found no way to make it work.
>
> here is may xen-dom1.cf file:
>
> kernel = "/boot/vmlinuz-2.6.12-xenU"
> ramdisk = "/boot/initrd.img-2.6.12-xenU"
> disk = [ ''phy:data/Dom1-root,sda1,w'' ]
> root = "/dev/sda2 ro"
> extra = "4"
>
> and here is what i got:
>
> mount: unknown filesystem type ''devfs''
> SCSI subsystem initialized
> register_blkdev: cannot get major 8 for sd
> umount: devfs: not mounted
> mount: unknown filesystem type ''devfs''
> umount: devfs: not mounted
> pivot_root: No such file or directory
> /sbin/init: 432: cannot open dev/console: No such file
> Kernel panic - not syncing: Attempted to kill init!
>
> Please, can anybody tellme where is the mistake and who to fix it?
>
> Regards,
> Ernesto
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

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Ernesto Rodriguez Reina schrieb:
> Hi again, thanks for answering i tried yaird and i got an error again:
> [..]
Ah, sorry, I''ve missread your post, I thought you have problems booting
dom0, but it''s a domU...
Then the first you should do is to chech your "root=.." entry like
Jan-Petter Kruger suggested.
If you still want to give yaird a try, I had a look how I did it and
here are my domU yaird config file and (a bit hackish) the templates
file. But be warned, the root device is hardcoded to /dev/hda1 and xfs
as filesystem. Have a look at the "TEMPLATE postlude" section. (The
problem is, that XEN doesn''t provide a "hda" if you export a
block
device hda1, but yaird depends on that).

Hope it helps.

Greetings,
Markus

<domU.cfg>
CONFIG
        FORMAT  cpio

        TEMPLATE FILE "/etc/yaird/Templates-domU.cfg"

        GOALS
                TEMPLATE        prologue

                OPTIONAL MODULE fbcon


                MODULE          xfs




                TEMPLATE        postlude
        END GOALS
END CONFIG
</domU.cfg>

<Templates-domU.cfg>
TEMPLATE SET
        TEMPLATE prologue
        BEGIN
                FILE "/dev/null"
                FILE "/dev/console"
                FILE "/bin/dash"
                FILE "/bin/cat"
                FILE "/bin/mkdir"
                FILE "/bin/mount"
                FILE "/bin/umount"
                FILE "/bin/mknod"
                FILE "/bin/sleep"
                FILE "<TMPL_VAR NAME=auxDir>/run_init"

                DIRECTORY "/mnt"
                DIRECTORY "/proc"
                DIRECTORY "/sys"
                DIRECTORY "/dev"
                DIRECTORY "/etc"
                DIRECTORY "/var"

                SCRIPT "/init"
                BEGIN
                        !INIT_DEBUG                        !if [
"$INIT_DEBUG" != "" ]
                        !then
                        !       set -x
                        !fi
                        !
                        !mksymdev () {
                        !       devfile="$1"
                        !       sysfile="$2"
                        !       cb="$3"
                        !       devpair=$(/bin/cat "$sysfile")
                        !       for delay in 1 2 4 8 16
                        !       do
                        !               if [ "$devpair" = ""
]
                        !               then
                        !                       echo "Waiting $delay
seconds for $sysfile to show up"
                        !                       sleep $delay
                        !               fi
                        !               devpair=$(/bin/cat "$sysfile")
                        !       done
                        !
                        !       if [ "$devpair" = "" ]
                        !       then
                        !               echo "Device $sysfile seems to
be down."
                        !               echo "Debugging opportunity,
type ^D to continue."
                        !               /bin/dash
                        !       fi
                        !
                        !       maj=${devpair%:*}
                        !       /bin/mknod "$devfile" $cb $maj $min
                        !}
                        !mkcdev () {
                        !       mksymdev "$1"
"/sys/class/$2/dev" c
                        !}
                        !mkbdev () {
                        !       mksymdev "$1"
"/sys/block/$2/dev" b
                        !}
                        !
                        !switchroot () {
                        !       if [ "$INIT_DEBUG" != "" ]
                        !       then
                        !               echo "Debugging opportunity, ^D
to continue."
                        !               /bin/dash
                        !       fi
                        !
                        !       echo "Switching root ..."
                        !       /bin/umount -n /sys
                        !       /bin/umount -n /proc
                        !       exec <TMPL_VAR NAME=auxDir>/run_init \
                        !               /mnt $init "$@"
                        !}
                        !
                        !/bin/mount -nt sysfs sysfs /sys
                        !/bin/mount -nt proc proc /proc
                        !
                        !mkcdev /dev/tty tty/tty
                        !
                        !ro=-r
                        !ip                        !nfsroot                     
!init=/sbin/init
                        !for i in $(cat /proc/cmdline)
                        !do
                        !       case "$i" in
                        !       init=*)
                        !               ;;
                        !       ro)
                        !               ro=-r
                        !               ;;
                        !       rw)
                        !               ro                        !             
;;
                        !       ip=*|nfsaddrs=*)
                        !               ip="$ip $i"
                        !               ;;
                        !       nfsroot=*)
                        !               nfsroot="$i"
                        !               ;;
                        !       ydebug)
                        !               INIT_DEBUG=yes
                        !       esac
                        !done
                        !if [ "$INIT_DEBUG" != "" ]
                        !then
                        !       set -x
                        !fi
                END SCRIPT
        END TEMPLATE


        TEMPLATE insmod
        BEGIN
                FILE "<TMPL_VAR NAME=target>"
                FILE "/sbin/insmod"

                SCRIPT "/init"
                BEGIN
                        !/sbin/insmod ''<TMPL_VAR
NAME=target>'' <TMPL_VAR
NAME=optionList>
                END SCRIPT
        END TEMPLATE


        TEMPLATE mkbdev
        BEGIN
                SCRIPT "/init"
                BEGIN
                        !mkbdev ''<TMPL_VAR NAME=target>''
''<TMPL_VAR
NAME=sysname>''
                END SCRIPT
        END TEMPLATE


        TEMPLATE mount
        BEGIN
                SCRIPT "/init"
                BEGIN
                        !/bin/mount -n \
                        !       <TMPL_IF NAME=isRoot>$ro</TMPL_IF> \
                        !       -t <TMPL_VAR NAME=fsType> \
                        !       <TMPL_VAR NAME=options> \
                        !       ''<TMPL_VAR NAME=device>''
\
                        !       ''<TMPL_VAR NAME=target>''
                END SCRIPT
        END TEMPLATE


        TEMPLATE postlude
        BEGIN
                SCRIPT "/init"
                BEGIN
                        !mkbdev ''/dev/hda1''
''hda1''
                        !/bin/mount -n -t xfs /dev/hda1 /mnt
                        !switchroot "$@"
                END SCRIPT
        END TEMPLATE
END TEMPLATE SET
</Templates-domU.cfg>


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