Systemctl command execution reports 'Too many open files' on Red Hat Enterprise Linux

Issue

• Every systemctl command throwing the Too many open files error like below.

# systemctl restart rsyslog
Error : Too many open files

# systemctl restart crond
Error: Too many open files

• Increasing fs.file-max in /etc/sysctl.conf to 32000000 and nofile in /etc/securities/limits.conf for all users from 1024 and 10240 also didn't helped.