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Set Security Limits

You might need to protect your system against fork bomb attacks. A simple way to prevent this is by setting up processes limit for your users. All the limits can be configured in the /etc/security/limits.conf file.

sudo vi /etc/security/limits.conf

This file comes with all the help you need. Here's an example:

user1 hard nproc 100
@group1 hard nproc 20

This will prevent users from a specific group from having a maximum of 20 processes and maximize the number of processes to 100 to user1.