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 learned about passive checks—the difference between active and passive checks and how to enable receiving passive check results. The chapter also covered how to submit passive check results to Nagios for both hosts and services.

We also learned how to troubleshoot not being able to send passive check results to Nagios properly. We have learned about NSCA, which is a tool for sending passive check results over a network. We also talked through how to set up NSCA server and client both by using binary distributions and by compiling NSCA from sources. We also set up an NSCA server that will receive passive check results.

We learned how to send passive check results to Nagios remotely using the send_nsca binary...