Ulimits

[Bradley Marshall <bmarshal@PIsoftware.com>]

Hi,

To limit resources under linux, you use ulimit.  To see the
limits currently applying to you:

   $ ulimit -a
   core file size (blocks)     0
   data seg size (kbytes)      unlimited
   file size (blocks)          unlimited
   max locked memory (kbytes)  unlimited
   max memory size (kbytes)    unlimited
   open files                  1024
   pipe size (512 bytes)       8
   stack size (kbytes)         8192
   cpu time (seconds)          unlimited
   max user processes          384
   virtual memory (kbytes)     unlimited

To modify these limits, you need to use pam_limits.so.  You do
this by adding the following line to the pam.d configuration -
to apply over the whole system, you need login, ssh and gdm.

   session    required     pam_limits.so

This will allow you to set limits in /etc/security/limits.conf.
You can do neat things like set limits for users and groups,
or set a default entry.  The comments in the file should
be sufficient to explain the format.  However, an example of
how we increased the limit on the number of processes a user
can run is:

   *                hard    nproc           1000

Note that we seemed to need a 2.4 kernel to use this properly.

Thanks,
Brad
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|Brad Marshall                    |           Plugged In Software|
|Senior Systems Administrator     |     http://www.pisoftware.com|
|mailto:bmarshal@pisoftware.com   |  GPG Key Id: 47951BD0 / 1024b|
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