Date: Tue, 16 Dec 2008 16:15:43 +0100 From: "Paul B. Mahol" <onemda@gmail.com> To: "Wojciech Puchar" <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-questions@freebsd.org, Bernard Dugas <bernard@dugas-family.org> Subject: Re: Optimising pxeboot disk size Message-ID: <3a142e750812160715p751483edh610a4adb055d31a2@mail.gmail.com> In-Reply-To: <20081216160327.N61449@wojtek.tensor.gdynia.pl> References: <20081216094719.EDCEE1065675@hub.freebsd.org> <49478749.2030200@dugas-family.org> <20081216123057.M61117@wojtek.tensor.gdynia.pl> <4947B50B.7010802@dugas-family.org> <20081216160327.N61449@wojtek.tensor.gdynia.pl>
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On 12/16/08, Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> wrote: >>> it's simple: >> >> More simple when you tell it ;-) Thanks a lot, i will try it tonight ! > > it doesn't have chance - must work :) > >> >>> I wish it's helpful, doing this doesn't just save space but saves time - >>> you have to upgrade software once. >> >> So preserving consistency, which is the most important when you have lot >> of >> diskless stations ! > > exactly. i'm using just NetBSD 1.5 (uses LITTLE memory) + Xserver, so > there are almost no updates, but anyway - it's stored once. > >>> you may like to make /etc-common directory and put most of files there, >>> and >>> symlinks in each station's /etc >> >> In fact, it makes me think that we miss a concept in mount, or at least i >> don't know it currently : >> imagine a -tl (TransparentLayer) option for mount, allowing to mount >> multiple >> source to the same directory, for instance /etc : > > there is already such think - mount_unionfs > > but i don't use it. > > if you mount over some directory - it's original contents (like my /etc/rc > doing exec /systemrc) gets hidden. > >> >> mount -r yournfsserver:/basic/etc /etc >> mount -tl -r yournfsserver:/TypeX/etc /etc >> mount -tl -r yournfsserver:/StationY/etc /etc > > mount_unionfs > > but i don't know how stable it is. > >> When you want to change something, you add a rw TransparentLayer : >> mount -tl yournfsserver:/StationYchanges/etc /etc >> >> So that changed or added files are only stored in this rw partition, thus >> very small and easy to manage. >> >> This would be a kind of partition inheritance, like in object languages... >> >> Dreams are allowed :-) > > try mount_unionfs and mount_nullfs -- Paul
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