Kernel parameters for hardening
/etc/security/limits.conf Concept https://wiki.archlinux.org/index.php/Limits.conf
/etc/security/limits.conf allows setting resource limits for users logged in via PAM. This is a useful way of preventing, for example, fork-bombs from using up all system resources.
Note: The file does not affect system services. For systemd services the files /etc/systemd/system.conf, /etc/systemd/user.conf, and /etc/systemd/<systemd_unit>/override.conf control the limit. See the systemd-system.conf(5) man page for details.
Config sample https://linux.die.net/man/5/limits.conf
* soft nofile 160000 The syntax of the lines is as follows: