Setting Resource Limits on CentOS/RedHat/Oracle Linux

While you can use Warden to automatically set resource limits, you may want to set limits manually.

About this task

Rather than relying on Warden to set resource file-access limits automatically using ulimit, you can use the following procedure to set the limits manually.

Procedure

  1. Edit /etc/security/limits.conf and add a line to set the resource limits. For example, set the resource limits to 65536. 
    <MAPR_USER> - nofile 65536
  2. Edit /etc/security/limits.d/90-nproc.conf to add a similar line. 
    <MAPR_USER> - nproc 64000
  3. Check that the /etc/pam.d/su file contains the following settings: 
    #%PAM-1.0
auth            sufficient      pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth           sufficient      pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth           required        pam_wheel.so use_uid
auth            include         system-auth
account         sufficient      pam_succeed_if.so uid = 0 use_uid quiet
account         include         system-auth
password        include         system-auth
session         include         system-auth
session         required        pam_limits.so
session         optional        pam_xauth.so
  4. Use ulimit to verify settings.
  5. Reboot the system.
  6. Run the following command as the mapr user (not root) at a command line: ulimit -n