What is SystemD's default value for LimitNOFILE (on CentOS7)

Question

It seems like a very easy question but I couldn't find, what the default for services in SystemD for LimitNOFILE is.

Is there a file with global defaults?

Answer 1

systemd imposes no such limit by default. however pam_limits generally does, configuration file is /etc/security/limits.conf

Answer 2

#/etc/security/limits.conf
#This file sets the resource limits for the users logged in via PAM.
#It does not affect resource limits of the system services.
#if your program startup via systemctl
#config /etc/systemd/system.conf
DefaultLimitNOFILE=