Editing Nagios (section)

== Design ==

Nagios agents include:

; NRPE: Nagios Remote Plugin Executor (NRPE) is a Nagios agent that allows remote system monitoring using scripts that are hosted on the remote systems.<ref>{{cite web|url=https://github.com/NagiosEnterprises/nrpe|title=NagiosEnterprises/nrpe|work=github.com|date=9 September 2022 }}</ref> It allows for monitoring of resources such as disk usage, system load or the number of users currently logged in. Nagios periodically polls the agent on remote system using the <code>check_nrpe</code> plugin. NRPE allows you to remotely execute Nagios plugins on other Linux/Unix machines. This would allow you to monitor remote [[Machine (disambiguation)#Computing|machine]] metrics (disk usage, CPU load, etc.). NRPE can also communicate with some Windows agent add-ons, so you can execute scripts and check metrics on remote Windows machines, as well. As of 28 Jan 2020, NRPE 4.0.1 has been deprecated.<ref>{{Cite web |title=Add deprecation notice |url=https://github.com/NagiosEnterprises/nrpe/commit/e5cdd3b641b36ca4f56b1c5ca7286dafb85ab56f |access-date=2021-07-16 |website=[[GitHub]]}}</ref>
; NRDP: Nagios Remote Data Processor (NRDP) is a Nagios agent with a flexible data transport mechanism and processor.<ref>{{cite web|url=https://github.com/NagiosEnterprises/nrdp|title=NagiosEnterprises/nrdp|work=github.com|date=2 December 2021 }}</ref> It is designed with an architecture that allows it to be easily extended and customized. NRDP uses standard ports and protocols ([[HTTP]] and [[XML]]) and can be implemented as a replacement for Nagios Service Check Acceptor (NSCA).
; NSClient++: This program is mainly used to monitor [[Windows]] machines. Being installed on a remote system, NSClient++ listens to port TCP 12489. The Nagios plugin that is used to collect information from this addon is called <code>check_nt</code>. As NRPE, NSClient++ allows to monitor the so-called 'private services' (memory usage, CPU load, disk usage, running processes, etc.) Nagios is a host and service monitor that is designed to inform you of network problems.
; NCPA: The Nagios Cross Platform Agent is an [[Open-source software|open source]] project maintained by Nagios Enterprises.<ref>{{cite web|url=https://github.com/NagiosEnterprises/ncpa|title=NCPA|date=12 August 2022 |publisher=[[GitHub]]}}</ref> NCPA installs on Windows, Linux, and Mac OS X. Created as a scale-able API that allows flexibility and simplicity in monitoring hosts. NCPA allows multiple checks such as memory usage, CPU usage, disk usage, processes, services, and network usage. Active checks are queried through the [[Application programming interface|API]] of the "NCPA Listener" service while passive checks are sent via the "NCPA Passive" service.