Nagios can leverage multiple solutions to monitor resources on remote machines—such as disk usage, swap, or other metrics.
In this chapter, we have learned the following items:
- Using SSH for running checks on remote machines
- Running multiple checks at once over SSH
- Troubleshooting the SSH-based checks
- Using NRPE for performing remote checks
- Setting up NRPE server and client as well as NRPE-based checks in Nagios
- Troubleshooting SSH and NRPE connections
- How SSH and NRPE differ from each other and when to use each of them
The next chapter talks about Simple Network Management Protocol (SNMP), which is a protocol for monitoring and managing various types of devices connected to a network. The protocol supports both querying the device as well as receiving information from the devices regarding the failure. The SNMP protocol is used by a large variety of devices, from network switches and routers to mainframe servers.
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