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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Bernard Dugas <bernard@dugas-family.org>
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Cc: "Paul B. Mahol" <onemda@gmail.com>, freebsd-questions@freebsd.org
Subject: Re: Optimising pxeboot disk size
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>
> MOUNT_NULLFS(8) doc is very detailled, but i can't find how to use it for my 
> problem : being able to go from common shared configuration to specific 
you can't - nullfs doesn't do this.

use symlinks

/etc containing tons of links to /sharedetc and few files instead of 
symlink - for those that are different.