Nagios allows both the monitoring of services on its own and the receipt of information about computer and service statuses from other applications. Being able to send results directly to Nagios creates a lot of opportunities for extending how Nagios can be used.
In this chapter we have learned the following items:
- What are passive checks and how they differ from Nagios performing active checks
- Submitting passive check results to Nagios
- How to troubleshoot errors with sending passive checks
- What is NRDP and how it can be used to submit passive checks remotely
- Configuring NRDP server and client
The next chapter will cover how to monitor remote hosts and how the SSH protocol can be used to run checks remotely in a secure way. It will also cover Nagios Remote Plugin Executor (NRPE), which is a client-server protocol that allows running checks remotely.
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