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Excluding specific processes from ulimit

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I manage a shared CentOS 8.1 server. I don't want users running computationally intensive processes on this server because it is the login node to a computer cluster. So we use ulimit to kill processes using more than 20minutes of cpu time.

However, I do want processes like sshd and srun to not be killed by ulimit. I see a similar question where an answer mentions cgroups.

Question : How do I selectively exclude specific user processes from ulimit?

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