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Title: Parallel Computing/Beowulf - ClusterNFS Patches to NFS to permit diskless clients to mount a root filesystem. Source code and documentation.
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ClusterNFS

Comments and Contributions Welcome

What is ClusterNFS?

ClusterNFS is a set of patches for the "Universal NFS Daemon" (UNFSD) serverto allow multiple diskless clients to NFS mount the same root filesystemby providing "interpreted" file names.When a client requests the file "/path/filename" , the ClusterNFS serverchecks for the existence of files of the form "/path/filename$$KEY=value$$".If such a file exists and the clients has a matching value for KEY, thisfile is returned. If the client does not have the matching value or nosuch file exists,  the file request proceeds as normal. Currentlysupported keys include, HOST (hostname), IP (IP number), UID (user id),GID (group id), and CLIENT (matches any NFS client).By naming all machine-specific files "filename$$IP=aaa.bbb.ccc.ddd"and naming files which are the same for all clients "filename$$CLIENT$$",the server and all clients can share the same root partition. This makesit easy to set up and maintain a pool of diskless machines. The ClusterNFShome page is hosted on a small Beowulf cluster http://queenbee.fhcrc.orgwhich has been constructed in this fashion.

How does it work?

When the NFS deamon is started with the command line option "-T" or "--translate-names"the NFS server  attempting to match the filename with various "interpreted"expressions appended.When a client requests the file "/path/filename",the ClusterNFS server  checks for for the following files, returningthe first match: FilenameMatches if:/path/filename$$UID=xxxx$$ Matches if the user id of the user accessing the file is xxxx./path/filename$$GID=yyyy$$Matches if the current group id of the user accessing the file is yyyy./path/filename$$HOSTNAME=ssss$$ Matches if the hostname of the client making the request is ssss./path/filename$$IP=xxx.xxx.xxx.xxx$$ Matches if the host ip number of the client making the request is xxx.xxx.xxx.xxx./path/filename$$CLIENT$$ Always matches on access through the NFS server./path/filenameAlways matches.If a matching file is located, but authorization is denied,this is NOTconsidered a match, and the next entry on the list will be attempted.To access the "base" file or directory, rather than the machine specificversion, simply append "$$$$" to the filename. This also causes two lookupattempts, first using the filename without the trailing "$$$$", then withthe trailing "$$$$".  The latter occurs in case there is a file actuallynamed "filename$$$$".As of version 0.91 alpha, all file  and directory actions (read, create,link, softlink, getattrib, setattrib, rename,  remove, copy, mkdir,rmdir) support this scheme. As of version 1.0.0-pre1, mount requests also support this scheme Future enhancement will suport:Control over the names of created/renamed/linked files via the presenceof a file with the tag $$CREATE=<tag>$$.  IE, when an attempt ismade to create a file named "myfile" the NFS server will check forthe presence of a file named "myfile$$CREATE=<tag>$$".  If sucha file exists, "myfile$$tag=value$$" will be created.   If not,the file creation will proceed as normal.    Creating afile named "$$CREATE=<tag>"  (no base filename) would control thename of all created files in the directory.

How can it be used?

A) ClusterNFS can be used to create a cluster using  diskless servers(see http://queenbee.fhcrc.org)that all share a common root filesystem.  Only files that are differentbetween the servers need to be duplicated.B) With a single linux server runing ClusterNFS and a boot floppy,any Windows machines can be converted to a fully functioning Linux machineby simply inserting the floppy and rebooting. Since the all configurationdetails live on the server, there is no need to repartition or otherwisemodify the local hard drive.A + B) With a single linux server runing ClusterNFS and a pile ofboot floppies, any set of Windows machines can become a Linux cluster inmoments. Your computer lab can be run Windows by day and Linux by nightwith a minimum of fuss.

Documentation

README.ClusterNFSChangeLogA Simple ExampleSimplifying Linux Clusters: MOSIX + ClusterNFS [html][AdobeAcrobat] [PostScript](This is a presentation that was given to the Seattle SAGE Group, May 11, 2000. It should be correct except for the URLS's, which have changed).A Recipe for a diskless MOSIX cluster using ClusterNFS[html][AdobeAcrobat][Postscript](This was written May 10, 2000. It should be correct except for the URLS's, which have changed.)

New: ClusterNFS is now hosted on  <b>Source</b>Forge Logo

See http://sourceforge.net/projects/clusternfs/

Bug List

TODO List

Downloads

How can I help?

Try it out and send me your comments, questions and bug reports.Write documentation, especially step-by-step examples.Comment on the code.Fix a bug or implement an enhancementsee http://sourceforge.net/bugs/?group_id=5768for a list of bugs and enhancement requests.

Frequently Asked Questions(FAQ)

Comments? Questions?

Email the author at clusternfs@warnes.net.

Credits

The ClusterNFS patch and documentation were created by Gregory R. Warnesclusternfs@warnes.net.The original version of the UNFS is maintained by Olaf Kirch okir@monad.swb.de.Thomas Schoebel-Theuer schoebel@informatik.uni-stuttgart.deprovided a patchfor Linux versions 2.0.x which provided similar features.  There have been  visits to thissite since May 13, 2000
 

Patches

to

NFS

to

permit

diskless

clients

to

mount

a

root

filesystem.

Source

code

and

documentation.

http://clusternfs.sourceforge.net/

ClusterNFS 2008 September

dvd rental

dvd


Patches to NFS to permit diskless clients to mount a root filesystem. Source code and documentation.

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