Resource limits

The limits.conf file located under the “/etc/security” directory can be used to control and limit resources for the users on your system. It is important to set resource limits on all your users so they can’t perform denial of service attacks (number of processes, amount of memory, etc). These limits will have to be set up for the user when he or she logs in. For example, limits for all users on your system might look like this.
Stepi
Edit the limits.conf file (vi /etc/security/limits.conf) and add or change the lines to read:
hard core 0
hard rss 5000
hard nproc 20
This says to prohibit the creation of core files “core 0″, restrict the number of processes to 20 “nproc 20″, and restrict memory usage to 5M “rss 5000″ for everyone except the super user “root”. All of the above only concern users who have entered through the login prompt on your system. With this kind of quota, you have more control on the processes, core files, and memory usage that users may have on your system. The asterisk “*” mean: all users that logs in on the server.
Step 2
You must also edit the 7etc/pam.d/login” file and add the following line to the bottom of the file:
session required /lib/security/pamlimits.so
After adding the line above, the 7etc/pam.d/login” file should look like this:
#%PAM-1.0
auth required
auth required
auth required
account required
password required
password required
session required
session required
#session optional
/lib/security/pam_securetty.so
/lib/security/pam_pwdb.so shadow nullok
/lib/security/pam_nologin.so
/lib/security/pam_pwdb.so
/lib/security/pam_cracklib.so
/lib/security/pam_pwdb.so nullok use_authtok md5 shadow
/lib/security/pam_pwdb.so
/lib/security/pamlimits.so
/lib/security/pam_console.so

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