Mounting rootfs via NFS

Mounting rootfs via NFS

[Fabio Estevam]

Hi,

I am trying to mount a rootfs generated by Yocto via NFS on a mx28evk:

[   11.289609] VFS: Mounted root (nfs filesystem) readonly on device 0:11.
[   11.297677] devtmpfs: mounted
[   11.302088] Freeing unused kernel memory: 212K (c05fb000 - c0630000)
INIT: version 2.88 booting
mount: permission denied (are you root?)
mount: permission denied (are you root?)
grep: /proc/filesystems: No such fi: Permission denied
bootlogd.Bootlog daemon: bootlogd:
mount: can't read '/proc/mounts': No such file or directory
ln: /dev/mtab: Permission denied
urandom start: failed.
/etc/init.d/rc: /etc/rcS.d/S37populate-volatile.sh: line 192: can't
open /proc/cmdline: no such file
grep: /proc/filesystems: No such file or directory
hostname: sethostname: Operation not permitted
Configuring network interfaces... ifconfig: SIOCSIFADDR: Operation not permitted
ifup: can't open '/var/run/ifstate': Read-only file system
hwclock: can't open '/dev/misc/rtc': No such file or directory
date: can't set date: Operation not permitted
Tue Apr 23 16:07:00 UTC 2013
hwclock: can't open '/dev/misc/rtc': No such file or directory
INIT: Entering runlevel: 5
hwclock: can't open '/dev/misc/rtc': No such file or directory
Starting syslogd/klogd: done
Stopping Bootlog daemon: bootlogd.

Any hints?

Thanks,

Fabio Estevam

Re: Mounting rootfs via NFS

[Eric Bénard]

Hi Fabio,

Le Tue, 14 May 2013 13:02:33 -0300,
Fabio Estevam <festevam@gmail.com> a écrit :
> I am trying to mount a rootfs generated by Yocto via NFS on a mx28evk:
> 
> [   11.289609] VFS: Mounted root (nfs filesystem) readonly on device 0:11.
> [   11.297677] devtmpfs: mounted
> [   11.302088] Freeing unused kernel memory: 212K (c05fb000 - c0630000)
> INIT: version 2.88 booting
> mount: permission denied (are you root?)
> mount: permission denied (are you root?)
> grep: /proc/filesystems: No such fi: Permission denied
> bootlogd.Bootlog daemon: bootlogd:
> mount: can't read '/proc/mounts': No such file or directory
> ln: /dev/mtab: Permission denied
> urandom start: failed.
> /etc/init.d/rc: /etc/rcS.d/S37populate-volatile.sh: line 192: can't
> open /proc/cmdline: no such file
> grep: /proc/filesystems: No such file or directory
> hostname: sethostname: Operation not permitted
> Configuring network interfaces... ifconfig: SIOCSIFADDR: Operation not permitted
> ifup: can't open '/var/run/ifstate': Read-only file system
> hwclock: can't open '/dev/misc/rtc': No such file or directory
> date: can't set date: Operation not permitted
> Tue Apr 23 16:07:00 UTC 2013
> hwclock: can't open '/dev/misc/rtc': No such file or directory
> INIT: Entering runlevel: 5
> hwclock: can't open '/dev/misc/rtc': No such file or directory
> Starting syslogd/klogd: done
> Stopping Bootlog daemon: bootlogd.
> 
> Any hints?
> 
what are your nfs server settings ?

Eric

Re: Mounting rootfs via NFS

[Fabio Estevam]

Hi Eric,

On Tue, May 14, 2013 at 1:05 PM, Eric Bénard <eric@eukrea.com> wrote:

> what are your nfs server settings ?

Here is my /etc/exports:

# /etc/exports: the access control list for filesystems which may be exported
#		to NFS clients.  See exports(5).
#
# Example for NFSv2 and NFSv3:
# /srv/homes       hostname1(rw,sync,no_subtree_check)
hostname2(ro,sync,no_subtree_check)
#
# Example for NFSv4:
# /srv/nfs4        gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
# /srv/nfs4/homes  gss/krb5i(rw,sync,no_subtree_check)
#
/tftpboot/rfs/ *(rw,no_root_squash,no_subtree_check,async)

sudo /etc/init.d/nfs-kernel-server restart
[sudo] password for fabio:
 * Stopping NFS kernel daemon                                            [ OK ]
 * Unexporting directories for NFS kernel daemon...                      [ OK ]
 * Exporting directories for NFS kernel daemon...                        [ OK ]
 * Starting NFS kernel daemon                                            [ OK ]

In the kernel log I see:

mount: permission denied (are you root?)

Not sure how to overcome this though.

Thanks,

Fabio Estevam

Re: Mounting rootfs via NFS

[Fabio Estevam]

On Tue, May 14, 2013 at 1:11 PM, Fabio Estevam <festevam@gmail.com> wrote:

> Not sure how to overcome this though.

Ok, the trick was to untar the rootfs via sudo in order to get the
correct permissions.

It is booting fine now:

[   10.219082] VFS: Mounted root (nfs filesystem) readonly on device 0:11.
[   10.227149] devtmpfs: mounted
[   10.231555] Freeing unused kernel memory: 212K (c05fb000 - c0630000)
INIT: version 2.88 booting
�Starting udev
[   11.872036] udevd[69]: starting version 182
Starting Bootlog daemon: bootlogd: cannot allocate pseudo tty: No such
file or directory
bootlogd.
Configuring network interfaces... ifup skipped for nfsroot interface eth0
run-parts: /etc/network/if-pre-up.d/nfsroot exited with code 1
INIT: Entering runlevel: 5
Starting syslogd/klogd: done
Stopping Bootlog daemon: bootlogd.

Poky 8.0 (Yocto Project 1.3 Reference Distro) 1.3+snapshot-20130423
imx23evk ttyAMA0

imx28evk login: root
root@imx28evk:~#

Thanks,

Fabio Estevam