Installing the Certificate from the Certifier
Once you have received your Certificate file from the Certifier, install it on the RTM server.
Edit the cacti.conf file in the /etc/httpd/conf.d directory and modify the <VirtualHost> entry as follows:
<VirtualHost _default_:443>
DocumentRoot /var/www/html
ServerName myrtm.domain.com
SSLEngine on
SSLCertificateFile /path/to/your_domain_name.crt
SSLCertificateKeyFile /path/to/your_private.key
SSLCertificateChainFile /path/to/certifiers_info.crt
</VirtualHost>
Usually these files are located in /etc/certs/httpd, but you can choose a location that matches your preferences.
Once you have made these changes, restart Apache using the following command:
systemctl restart httpd