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Re: Unknown command 'else'?

From: Michael Mohr
Subject: Re: Unknown command 'else'?
Date: Mon, 21 Sep 2015 23:40:13 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0

You might consider using iPXE to bootstrap your clients. The iPXE UEFI images can vary in size, but the one we use to PXE boot nodes over IPv6 is just over 120kb. iPXE can chain load a secondary UEFI binary over any protocol (HTTP, FTP, etc) if support is built into the UEFI image. This is scalable to 3000+ nodes booting simultaneously.

On 09/21/2015 10:52 PM, Steven Shiau wrote:

On 9/19/2015 PM 01:28, Andrei Borzenkov wrote:
19.09.2015 03:14, Steven Shiau пишет:
Since this "subtle" embedded preconfig way works, and the efi image file
created by grub-mkimage is smaller than that of grub-mkstandalone (my
case is 0.9MB vs. 6MB),

grub-mkstandalone creates full-fledged GRUB install on internal memory
disk, which includes fonts, themes, translations. You can skip them
(--locales= --fonts= --themes=) which cuts down image size to about 2MB.
You can further selectively include only specific modules
(--install-modules) but is it really worth it? More than once I have met
problems with vendor signed EFI images that do not support module
loading and every time commands I would use to troubleshoot were not
Thanks for your comments. Yes, you are right, maybe it's not worthy. I will think about that. Once thing about my concern is the EFI image is on tftp server and is for massive deployment. Therefore there might be more than 10, 100 or even 1000 clients boot at the same time to request the EFI image on the server. Therefore if we can keep the size as small as possible, it is definitely worthy in the massive deployment scenario. BTW, one more question. Is that possible to do some variable substitution in preconfig?
In my case, the "$net_default_mac" is like:
It's not really a good file name on Unix system, i.e.
The config I define in my case:
configfile $prefix/grub.cfg-01:$net_default_mac
is like
I'd like to make it as something like:
so the file name is better without ":".
I tried to use:
configfile $prefix/grub.cfg-01-${net_default_mac//:/-}
However, this bash variable substitution apparently is not working. So in the preconifg, rescue mode, how can I make that?
Thank you very much.


Michael Mohr
Software Engineer III
Hyve Solutions
Office: 510-668-3527
Mobile: 510-449-9331

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