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Re: Rescue Mode

On Fri, Nov 22, 2002 at 04:37:01PM -0800, Sameer Kamat wrote:
> Hello
>       I would like to boot up the machine under linux rescue using a CD.
> Then is it possible to unmount that CD in rescue mode and mount another one.
> Is there a way that I can copy the contents that it uses off the CD into
> memory so that I can then mount another CD?

I actually did this awhile back so that I could have linux running 
entirely in RAM. It was a bit of a side project, but the system would 
boot up from the CD, copy itself into RAM, and then run from there. It 
was supposed to become a router that could just reboot if hacked or some 
other problem occurred, but I lost interest... but I digress :)

You'll need tmpfs support in your kernel and enough RAM to hold 
whatever's on the CD and run the system.

You'll need to use /bin/sh as your init. Mount the tmpfs file system, 
copy the cd to it, then you need to exec a pivot_root or chroot. I don't 
remember the exact sequence anymore. Then you should be able to unmount 
the CD.

I've glossed over quite a bit here, but that' the general idea. Someone 
should write a HOWTO, heh.

Good luck,
John
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