limit resource of a user

hi,
I am running a linux server (RH) to host some domains, using Apache 1.3.23.


Some of my clients use CGI, and they make my server very high loading at peak hrs.

Do you know any methods to limit the usage of CPU/MEM/resources of a particular user?
(I use SUEXEC for CGI programs.)

stanleyhuenAsked:
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ahoffmannCommented:
- either change shell limits
     for sh and friends in /etc/profile (or similar)
          ulimit -u 10
     for csh and friends in /etc/csh.cshrc or ~/.cshrc
          limit maxproc 10
  see limit or ulimit man-page for details

- or change /usr/src/linux/include/linux/tasks.h
     #define NR_TASKS
     #define MAX_TASKS_PER_USER
     #define MIN_TASKS_LEFT_FOR_ROOT
then recompile the kernel
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stanleyhuenAuthor Commented:
Thanks ahoffmann,

Can you describe more how to ulimit/limit a particular user?

I don't want to limit all users, but only one or two, How can I do?

Thanks.

Stanley
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stanleyhuenAuthor Commented:
And I am using bash, any ulimit/limit command in bash?
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ahoffmannCommented:
put the suggested commands in the files in /etc (which cannot be modified by ordinary users), make these commands dependent on the $USER variable, like

if [ $USER = "you" ]; then
     ulimit -u 10
fi

check the docs of your shell how to make this limit unchangeable by the user.
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