Nagios Support Forum

Hey Guys I am fairly new with Niagios. i tried to install it on my centos7 I think I follow all the steps but I get this error below when I try to start the service:
Aug 04 04:53:19 ip-172-31-42-55.us-east-2.compute.internal systemd[1]: Starting Nagios Core 4.4.2...
Aug 04 04:53:19 ip-172-31-42-55.us-east-2.compute.internal systemd[1]: nagios.service: control process exited, code=exited st...=203
Aug 04 04:53:19 ip-172-31-42-55.us-east-2.compute.internal systemd[1]: Failed to start Nagios Core 4.4.2.
Aug 04 04:53:19 ip-172-31-42-55.us-east-2.compute.internal systemd[1]: Unit nagios.service entered failed state.
Aug 04 04:53:19 ip-172-31-42-55.us-east-2.compute.internal systemd[1]: nagios.service failed.
Hint: Some lines were ellipsized, use -l to show in full.
I need help please

Maybe try the following.
systemctl -l status nagios
Have a look at /var/log/messages and /usr/local/nagios/var/nagios.log files for clues as to why it failed to start. I'm not certain that's the right path to nagios.log in core. If not try locate nagios.log or find / -name nagios.log.