contrib/linux-2.0-transname.lsm - ipxe - Git at Google

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 From: schoebel@informatik.uni-stuttgart.de (Thomas Schoebel-Theuer)
 Newsgroups: comp.os.linux.announce
 Subject: linux-2.0.21-transname - Patch for easier pool administration
 Followup-To: comp.os.linux.misc
 Date: 30 Oct 1996 10:53:38 GMT
 Organization: Informatik, Uni Stuttgart, Germany
 Lines: 76
 Approved: linux-announce@news.ornl.gov (Lars Wirzenius)
 Message-ID: <pgpmoose.199610301253.4416@liw>
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 linux-2.0.21-transname.patch enables diskless clients, X-terminals etc to
 mount the *root filesystem* of the server. This makes administration of
 large pools *a lot* easier.

 Currently different diskless clients must have their root "/" on different
 directories on the server, beause each client has _some_ different
 configuration files. However, most administration files (typically about 99%)
 have the same contents on the clients and on the server, but have to be
 (and maintained separately) just because of the 1% differences.

 This duplication causes very large efforts in practice, since at least
 the /etc directory has to be duplicated for every client. Even in /etc
 many files are identical, for example sendmail.cf, initrc scripts and
 others. Maintaining a large pool means to ensure coherence amoung the
 duplicates. Classical methods like symlinks are unconvenient
 for this task because they have to be valid in the view of mounted
 filesystems at the client, not at the server.

 linux-2.0-transname.patch overcomes this problem by allowing filenames
 to be context-dependend. For example, if you have a file "/etc/config"
 that should differ on the hosts "myserver" and "myclient", you just
 create two different files named "/etc/config#host=myserver#" and
 "/etc/config#host=myclient#". On host "myserver", the file
 "/etc/config#host=myserver#" will appear as if it were hardlinked to
 file "/etc/config" (without the #...=...# suffix). On host "myclient",
 the corresponding other file will appear as "/etc/config". So you
 can access the right file contents under the same name, depending
 on which host you are.

 As a result, you may use different contexts for e.g. /etc/fstab, but
 have one shared /etc/passwd for all pool machines. So you don't need
 yp or NYS any more.

 The kernel patch was developped for and is used at our Linux pool at the
 University of Stuttgart with good results. Maintainance of the pool is
 at a minimum, and adding new clients is a child's play. No worry with
 keeping up mail configurations, newly installed tools, changed /etc/services,
 /etc/shells, /etc/resolv.conf and many, many others. In contrast to a
 sophisticated symlink solution, adding a new file to the /etc directory
 is seen immediately by all clients. I never had less trouble with
 administration before.

 I just uploaded the patch to
   ftp://ftp.lmh.ox.ac.uk
          where it should appear in /pub/linux-kernel-patch-archive/
 and also to
   ftp://sunsite.unc.edu/pub/Linux/Incoming/
          where it should be moved to /pub/Linux/kernel/patches/misc/ soon.

 More details can be found in the README there, and also in the
 configure-help.

 Enjoy,

 - -- Thomas


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	From: schoebel@informatik.uni-stuttgart.de (Thomas Schoebel-Theuer)
	Newsgroups: comp.os.linux.announce
	Subject: linux-2.0.21-transname - Patch for easier pool administration
	Followup-To: comp.os.linux.misc
	Date: 30 Oct 1996 10:53:38 GMT
	Organization: Informatik, Uni Stuttgart, Germany
	Lines: 76
	Approved: linux-announce@news.ornl.gov (Lars Wirzenius)
	Message-ID: <pgpmoose.199610301253.4416@liw>
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	=hhea

	-----BEGIN PGP SIGNED MESSAGE-----

	linux-2.0.21-transname.patch enables diskless clients, X-terminals etc to
	mount the root filesystem of the server. This makes administration of
	large pools a lot easier.

	Currently different diskless clients must have their root "/" on different
	directories on the server, beause each client has _some_ different
	configuration files. However, most administration files (typically about 99%)
	have the same contents on the clients and on the server, but have to be
	(and maintained separately) just because of the 1% differences.

	This duplication causes very large efforts in practice, since at least
	the /etc directory has to be duplicated for every client. Even in /etc
	many files are identical, for example sendmail.cf, initrc scripts and
	others. Maintaining a large pool means to ensure coherence amoung the
	duplicates. Classical methods like symlinks are unconvenient
	for this task because they have to be valid in the view of mounted
	filesystems at the client, not at the server.

	linux-2.0-transname.patch overcomes this problem by allowing filenames
	to be context-dependend. For example, if you have a file "/etc/config"
	that should differ on the hosts "myserver" and "myclient", you just
	create two different files named "/etc/config#host=myserver#" and
	"/etc/config#host=myclient#". On host "myserver", the file
	"/etc/config#host=myserver#" will appear as if it were hardlinked to
	file "/etc/config" (without the #...=...# suffix). On host "myclient",
	the corresponding other file will appear as "/etc/config". So you
	can access the right file contents under the same name, depending
	on which host you are.

	As a result, you may use different contexts for e.g. /etc/fstab, but
	have one shared /etc/passwd for all pool machines. So you don't need
	yp or NYS any more.

	The kernel patch was developped for and is used at our Linux pool at the
	University of Stuttgart with good results. Maintainance of the pool is
	at a minimum, and adding new clients is a child's play. No worry with
	keeping up mail configurations, newly installed tools, changed /etc/services,
	/etc/shells, /etc/resolv.conf and many, many others. In contrast to a
	sophisticated symlink solution, adding a new file to the /etc directory
	is seen immediately by all clients. I never had less trouble with
	administration before.

	I just uploaded the patch to
	ftp://ftp.lmh.ox.ac.uk
	where it should appear in /pub/linux-kernel-patch-archive/
	and also to
	ftp://sunsite.unc.edu/pub/Linux/Incoming/
	where it should be moved to /pub/Linux/kernel/patches/misc/ soon.

	More details can be found in the README there, and also in the
	configure-help.

	Enjoy,

	- -- Thomas


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