How to stop direct running of executable


 
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Old 08-19-2010
How to stop direct running of executable

Dear Sir,

I am using CentOS-5.2(64-bit) as an server side OS in a cluster with 32 slaves+1 Master. My question is, after compiling a file with ifort, I am suppose to get a executable(say a.out). I want my users to do ssh slave.local and then do ./a.out
But is it possible to restrict users launch the job(i.e. ./a.out in master node) directly in the master node?
If users fires job in master node, then at times the master node gets crashed. The reason is, the jobs are high end computational codes that may run for a month!
Can you please guide me to the procedures of disabling the direct launch of job in master node?
Thanks

S N Banerjee
India
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STICKY(8)						      System Manager's Manual							 STICKY(8)

NAME
sticky - persistent text and append-only directories DESCRIPTION
The sticky bit (file mode bit 01000, see chmod(2)) is used to indicate special treatment for certain executable files and directories. STICKY TEXT EXECUTABLE FILES
While the `sticky bit' is set on a sharable executable file, the text of that file will not be removed from the system swap area. Thus the file does not have to be fetched from the file system upon each execution. Shareable text segments are normally placed in a least-fre- quently-used cache after use, and thus the `sticky bit' has little effect on commonly-used text images. Sharable executable files are made by the -n and -z options of ld(1). Only the super-user can set the sticky bit on a sharable executable file. STICKY DIRECTORIES
A directory whose `sticky bit' is set becomes an append-only directory, or, more accurately, a directory in which the deletion of files is restricted. A file in a sticky directory may only be removed or renamed by a user if the user has write permission for the directory and the user is the owner of the file, the owner of the directory, or the super-user. This feature is usefully applied to directories such as /tmp which must be publicly writable but should deny users the license to arbitrarily delete or rename each others' files. Any user may create a sticky directory. See chmod(1) for details about modifying file modes. BUGS
Since the text areas of sticky text executables are stashed in the swap area, abuse of the feature can cause a system to run out of swap. Neither open(2) nor mkdir(2) will create a file with the sticky bit set. 4th Berkeley Distribution May 26, 1986 STICKY(8)