Escaping GRUB rescue prompt

[ay...@onlab.us]

Hi,

I have an Accton 6712 onto which I am trying to install ONL. After fetching the installer, running it, and rebooting, I am brought to the grub rescue prompt. Quick inspection tells me that I can't find any of my files (including in lost+found, and the 'normal' grub module):

grub rescue> set                                                               
cmdpath=(hd0)                                                                  
prefix=(hd0,gpt4)/grub                                                         
root=hd0,gpt4
grub rescue>                                                                  
grub rescue> ls /                                                              
./ ../ lost+found/

As a result, I also don't have access to the typical grub commands e.g. exit, boot, etc.

A reboot doesn't seem to get me back to the ONIE prompt, nor a loader prompt to let me choose.
Does anyone know of a way to get back to the ONIE prompt to from the rescue prompt?


Thanks,
Ayaka

[Rob Sherwood]

Hi Akaya,

Short story is that's not supposed to happen.  Let me track down a reinstaller image for you and then we can debug how it happened in the first place.

- Rob

.

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[Ayaka Koshibe]

Hi Rob,

Thanks for the reply. The installer I had used what whichever that

wget http://opennetlinux.org/binaries/latest-amd64.installer

would fetch....


Ayaka

[Rob Sherwood]

Hi Ayaka,

So, there is an .ISO file that you can get from Accton that will reinstall the disk to a factory default - I apparently legally can't give you my copy; you need to get it directly from them.  I believe you can apply for this file via the Accton/Edge-Core online support with http://www.edge-core.com/OnlineReg.asp.  Hopefully someone from Accton/Edge-Core can help you with this process -- there are a bunch of them on this mailing list.

Once you get this file, you can either put it onto a USB disk or put it onto a PXE boot server, and when it loads, it will reset the system so we can fix what's going on.  

Guessing a bit as to what went wrong, if you have an older system, then perhaps it had an older version of ONIE that did not interact well with the installer.  If by chance this was the case, it would be this same process to update to the newest version of ONIE.

Let me know if this helps,

- Rob

.

[Jeffrey Townsend]

Ayaka, 

You might try the following steps to manually boot into ONIE. From there you can re-run an installer or ONIE updater. 

# This should be the partition on the ONIE partition on the AS6712. 
# It might be hd1 or hd0. Change appropriately. 

grub rescue> ls (hd0,gpt2)/

./ ../ lost+found/ onie/ grub/ grubenv

# These instructions will load the kernel and ONIE initrd. 

grub rescue> set prefix=(hd0,gpt2)/grub

grub rescue> set root=(hd0,gpt2)

grub rescue> insmod normal

grub rescue> insmod linux

grub rescue> ls /onie

./ ../ vmlinuz-3.2.35-onie initrd.img-3.2.35-onie tools/ grub/ grub.d/ config/

grub rescue> linux /onie/vmlinuz-3.2.35-onie console=tty0 console=ttyS1,115200n8

grub rescue> initrd /onie/initrd.img-3.2.35-onie

# The system will not boot into ONIE and you can recover or re-install from there. 

grub rescue> boot

Jeff

[Ayaka Koshibe]

Hi Rob,

Thanks, I'll try to apply for the reinstaller as you suggest.

It's quite odd, I had three other switches of the same model for which
the install process went swimmingly...


Ayaka

On Sun, Apr 17, 2016 at 6:55 AM, Rob Sherwood

[Ayaka Koshibe]

Hi Jeff,

From the bit of digging that I did, I wasn't able to find any
files/directories except for an empty lost+found. But this is
definitely good to know for future reference -- thank you.


Ayaka

[Ayaka Koshibe]

Thanks for your help; I've managed to get my switch reinstalled and
now it's up and running.


Ayaka

[Rob Sherwood]

Good to hear, though I'm still concerned about the original problem.  Did you execute the same installer script and have a different result?  That could in theory happen if you used the rescue ISO I mentioned because that also has the effect of updating ONIE to a known good version.

That said, glad it's working now.

- Rob

.

[Ayaka Koshibe]

Once I was back in ONIE I basically retried fetching the installer,
and running it. I think that all four of the Acctons were running the
same ONIE -- is it possible that my installer happened to be faulty
during my initial run with this one switch?

In any case, thanks again.


Ayaka

On Mon, Apr 18, 2016 at 3:00 PM, Rob Sherwood