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94 lines
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Xref: news.nsw.CSIRO.AU comp.os.linux.announce:2827
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Path: news.nsw.CSIRO.AU!metro!metro!munnari.OZ.AU!news.ecn.uoknor.edu!news.wildstar.net!news.ececs.uc.edu!newsrelay.netins.net!newsfeed.dacom.co.kr!arclight.uoregon.edu!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!liw.clinet.fi!usenet
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From: schoebel@informatik.uni-stuttgart.de (Thomas Schoebel-Theuer)
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Newsgroups: comp.os.linux.announce
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Subject: linux-2.0.21-transname - Patch for easier pool administration
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Followup-To: comp.os.linux.misc
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Date: 30 Oct 1996 10:53:38 GMT
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Organization: Informatik, Uni Stuttgart, Germany
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Lines: 76
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Approved: linux-announce@news.ornl.gov (Lars Wirzenius)
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Message-ID: <pgpmoose.199610301253.4416@liw>
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NNTP-Posting-Host: liw
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X-Auth: PGPMoose V1.1 PGP comp.os.linux.announce
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iQBVAwUBMnczrjiesvPHtqnBAQEO6gH/WRtFpTPyVtwi0cFVPZ1Xhn8cvfb6i3mk
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LQY2kgpAPquP2TeXYWb5Ta3HxqK15pR1AgaEy5BmPS6+66ixZFvKRQ==
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=hhea
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-----BEGIN PGP SIGNED MESSAGE-----
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linux-2.0.21-transname.patch enables diskless clients, X-terminals etc to
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mount the *root filesystem* of the server. This makes administration of
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large pools *a lot* easier.
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Currently different diskless clients must have their root "/" on different
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directories on the server, beause each client has _some_ different
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configuration files. However, most administration files (typically about 99%)
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have the same contents on the clients and on the server, but have to be
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(and maintained separately) just because of the 1% differences.
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This duplication causes very large efforts in practice, since at least
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the /etc directory has to be duplicated for every client. Even in /etc
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many files are identical, for example sendmail.cf, initrc scripts and
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others. Maintaining a large pool means to ensure coherence amoung the
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duplicates. Classical methods like symlinks are unconvenient
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for this task because they have to be valid in the view of mounted
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filesystems at the client, not at the server.
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linux-2.0-transname.patch overcomes this problem by allowing filenames
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to be context-dependend. For example, if you have a file "/etc/config"
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that should differ on the hosts "myserver" and "myclient", you just
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create two different files named "/etc/config#host=myserver#" and
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"/etc/config#host=myclient#". On host "myserver", the file
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"/etc/config#host=myserver#" will appear as if it were hardlinked to
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file "/etc/config" (without the #...=...# suffix). On host "myclient",
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the corresponding other file will appear as "/etc/config". So you
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can access the right file contents under the same name, depending
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on which host you are.
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As a result, you may use different contexts for e.g. /etc/fstab, but
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have one shared /etc/passwd for all pool machines. So you don't need
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yp or NYS any more.
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The kernel patch was developped for and is used at our Linux pool at the
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University of Stuttgart with good results. Maintainance of the pool is
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at a minimum, and adding new clients is a child's play. No worry with
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keeping up mail configurations, newly installed tools, changed /etc/services,
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/etc/shells, /etc/resolv.conf and many, many others. In contrast to a
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sophisticated symlink solution, adding a new file to the /etc directory
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is seen immediately by all clients. I never had less trouble with
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administration before.
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I just uploaded the patch to
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ftp://ftp.lmh.ox.ac.uk
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where it should appear in /pub/linux-kernel-patch-archive/
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and also to
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ftp://sunsite.unc.edu/pub/Linux/Incoming/
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where it should be moved to /pub/Linux/kernel/patches/misc/ soon.
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More details can be found in the README there, and also in the
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configure-help.
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Enjoy,
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- -- Thomas
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--
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This article has been digitally signed by the moderator, using PGP.
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http://www.iki.fi/liw/lars-public-key.asc has PGP key for validating signature.
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Send submissions for comp.os.linux.announce to: linux-announce@news.ornl.gov
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PLEASE remember a short description of the software and the LOCATION.
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This group is archived at http://www.iki.fi/liw/linux/cola.html
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