Hello I am installing Nagios XI on red hat 7 and I am getting this error message
./fullinstall
========================
Nagios XI Full Installer
========================
This script will do a complete install of Nagios XI by executing all necessary
sub-scripts.
IMPORTANT: This script should only be used on a 'clean' install of CentOS or
RedHat. Do NOT use this on a system that has been tasked with other purposes
or has an existing install of Nagios Core. To create such a clean install
you should have selected ONLY the 'Base' package in the OS installer.
Do you want to continue? [Y/n] Y
Proceeding with installation...
Checking MySQL credentials...
MySQL not yet installed - that's okay.
Running './0-repos'...
Configuring Repos...
Passed New Subscription Check
package centos-release is not installed
An error has occurred:
ERROR: can not find RHNS CA file: /usr/share/rhn/RHN-ORG-TRUSTED-SSL-CERT
See /var/log/up2date for more information
ERROR: Please add the 'Optional' channel to your Red Hat systems subscriptions.
You can do so in the Redhat Network web interface or using the rhn-channel command.
or, install the yum-utils package and use the following command:
yum-config-manager --enable rhel-7-server-optional-rpms
RESULT=1
===================
INSTALLATION ERROR!
===================
Installation step failed - exiting.
Check for error messages in the install log (install.log).
If you require assistance in resolving the issue, please include install.log
in your communications with Nagios XI technical support.
The script that failed was: './0-repos'