Defining the dependencies
It is a very common scenario that computers, or the applications they offer, depend on other objects to function properly. A typical example is a database on which an e-mail or web server will depend. Another one is a host behind a private network that depends on an OpenVPN service to work. As a system administrator, your job is to know these relations—if you plan to reinstall a database cluster, you need to let people know there will be downtime for almost all applications. Nagios should also be aware of such relations.
In such cases, it is very useful for system monitoring software to consider these dependencies. When analyzing which hosts and services are not working properly, it is good to analyze such dependencies ...
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