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Nagios: Building Enterprise-Grade Monitoring Infrastructures for Systems and Networks, Second Edition by David Josephsen

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Chapter 2. Theory of Operations

Monitoring servers, as a consequence of their job, interact with other systems quite a bit. They speak SMTP to the mail systems, SQL to the database systems, and HTTP, HTTPS, AJP, SOAP, and by the time you read this, who knows what else to the web servers. The monitoring server could be considered an odd sort of multilayer protocol simulator. It needs to be able to give input to, and understand the output of, every protocol spoken by every system in any environment.

Imagine for a moment, being tasked with creating such a system. How would you build it? Would you brute-force it? Even though there are a lot of protocols, they are finite, so it should be possible to create one big program that can monitor every conceivable ...

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