Permanently set process limit

Edit /etc/security/limits.conf and configure nprocs appropriately.

You may need to add pam_limits to your pam configuration. The default configuration has pam_limits configured for many services. You may want to add pam_limits to /etc/pam.d/common-session.

Edit /etc/security/limits.conf, making changes per the examples and for the limits you want.

You'll also need to add a line to the /etc/pam.d/common-session file:

session required pam_limits.so

The change to PAM modules may be necessary elsewhere, but generally, common-session is included related configurations, e.g.,

$ grep common-session /etc/pam.d/sshd :     

   sshd:@include common-session