The Nagios Plugins package offers a large variety of checks that can be performed to monitor your infrastructure. Whether you are an administrator of an IT company managing a large network, or just want to monitor a small server room, these plugins will allow you to check the majority of the services that you are currently using.
In this chapter, you learned how the plugins report status to Nagios using standard output and exit codes. You also learned about the Nagios Plugins project and the standard options for all the plugins within the package.
We also covered the generic communication plugins for checking remote host connectivity using ping as well as generic TCP and UDP checking plugins.
The chapter also described how to perform checks of standard networking protocols, such as e-mail, FTP, DHCP, website checking as well as Nagios process information.
You also learned about checking various databases and how it can also be used for monitoring the propagation of data to slave databases...