How to Set Limits on User Running Processes in Linux

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Marin Todorov

I am a bachelor in computer science and a Linux Foundation Certified System Administrator. Currently working as a Senior Technical support in the hosting industry. In my free time I like testing new software and inline skating.

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7 Responses

  1. ramu says:

    Hi, why it should be 16384 only? even i have same issue. I tried with 4096 it is not resolving the issue.

  2. Deepa says:

    I am able to change the nproc for additional users using /etc/security/limits.conf but some how root users nproc value set is 150. When logged as root and execute ulimit -n I get the value 150.

    How can I change root users nproc value?

    • Ravi Saive says:


      The system wide configuration file /etc/security/limits.d/90-nproc.conf (RHEL6) and /etc/security/limits.d/20-nproc.conf (RHEL7) specifies the default nproc limits as:

      *            soft    nproc     1024
      root       soft    nproc     unlimited
      • Deepa says:

        Thank you, We are Using RHEL 6. Checked the /etc/limits. d/90-nproc.conf this file has same values as you mentioned. However when I run ulimit – u as root or any other user get value 150.

        In file /etc/security/limits.conf file I commented line * hard nproc 150 which was there before. I logged out restarted httpd still same value is coming. How reset default nproc value for root and other users. Please help

  3. Jalal Hajigholamali says:


    Thanks a lot.

  4. Marin Todorov says:

    Can you actually see what processes are being executed? Share those with so we can have a better understanding of the issue. Also my suggestion is to check the IO utilisation as well

  5. Sandeep Singh Rawat says:

    Hi Ravi,

    I am facing the issue with oracle user, user complains for slowness in Apache. while slowness issue I am not able to login with oracle users. It is giving error like resources are in use. Every time i have to restart my network services. I have set my oracle user limits in /etc/security/limits.conf as oracle soft nproc 16384
    oracle hard nproc 16384
    oracle soft nofile 4096
    oracle hard nofile 65536
    oracle soft stack 10240.

    Please share if you can help me.

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