Checking whether a service is available over a network can be done from a single machine. In such cases, using a single, dedicated machine to do all of these checks would be a good idea as it also reduces the load to be on just a single computer on your network. In reality, this is not enough for a robust computer and failure monitoring solution.

In this chapter, we have learned how to perform checks on the remote machines using the SSH protocol. We have set up our SSH private key, added the corresponding public key to remote machine, and performed the checks using this approach. We have also learned how to perform multiple checks over the SSH protocol using a single check invocation, which can be used to reduce the number of connections and load on the remote machine.

This chapter also covers the NRPE protocol and how to set up the NRPE server and client. We have configured an NRPE server that allows specific checks from the remote machines. We have also learned how to use NRPE to...