Security updates in the centos host, notified through nagios.

 ***** Nagios *****

    

    Notification Type: PROBLEM

    

    Service: Security updates

    Host: Hostname

    Address: ipaddress

    State: CRITICAL

    

    Date/Time: xxxxxxx 2017

    

    Additional Info:

    

    1 Security Update Available. 2 Non-Security Updates Available

    

To list all available security updates without installing them:

yum list-security --security 

This will ONLY install the security package needed:

yum -y update --security