[SATLUG] diskless ramdisk booting

Borries Demeler demeler at biochem.uthscsa.edu
Wed Jul 27 11:21:15 CDT 2016


We managed to boot from nfsroot, but we really need a RAM disk for /var and /etc
for each node to be different.

Yes, you are correct, the init switching is what we have not yet figured out :-)

-b.
On Wed, Jul 27, 2016 at 11:00:20AM -0500, Craig wrote:
> ...
> > But we so far have been unable to build a proper kernel or ramdisk that
> > gets past the mounting point where the root ramdisk file system gets
> > mounted and cannot figure out where we are going wrong. Any help would
> > be appreciated. We tried to follow this guide to the T:
> >> http://eduardo-lago.blogspot.com/2012/06/ram-only-pxe-boot-smallest-diskless.html <http://eduardo-lago.blogspot.com/2012/06/ram-only-pxe-boot-smallest-diskless.html>
> >
> > and searched the internet for all kinds of other documentation on the topic.
> > But we must be missing something essential, like our init is not getting
> > executed or the kernel cannot find the root file system.
> ...
> 
> Kinda sounds like an issue related to switching from initial boot
> program area to final OS run area (e.g. root
> file system area for "nic card" & switch to root file system area for
> "RAMdisk" once everything has been setup in ram)
> Since there are several ways under linux to do the swtich, might want
> to look in the boot scripts
> for commands/programs discussed in
> http://tiebing.blogspot.com/2014/02/linux-switchroot-vs-pivotroot-vs-chroot.html
> 
> Craig
> -- 
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