Nagios Plugins

Nagios uses plugins for monitoring servers and services. With this plugin architecture, Nagios can be easily extended for new monitoring requirements. Currently there are hundreds of free plugins, just a small proportion of which are listed below;

Windows NT, 2000 or 2003

	CPU utilization
	used hard-drive space
	used and free virtual memory
	availability of individual NT services
	availability of individual processes
	as well as all performance data that windows provides through the system monitor

Linux & Unix

	TCP: availability of a TCP Port
	UDP: availability of a UDP Port
	Disk: free or used space on partitions
	Load: CPU utilization
	Databases: availability of a data base (e.g. MySQL, PostgreSQL, Oracle)
	Procs: number of running processes
	Users: number of logged-in users
	VSZ: memory consumption of processes
	SMB: used space on SMB(CIFS) shares
	Swap: free memory space on a swap partition

Network Services

	SNMP: retrieval of SNMP information from other devices
	DNS: availability of name resolution
	FTP: availability of File Transfer Protocol
	HTTP: availability of individual websites
	LDAP: LDAP directories
	NNTP: news services
	PING: availabilty of hosts via ping
	SMTP: availability of SMTP mail servers
	POP: availability of POP email servers
	Time: check a time server
	Real: availability of a real media server
	Radius: availability of a radius server
	SSH: availability of SSH servers

Hardware & miscellaneous

	UPS: check an uninterruptible power supply
	NetApp: availability of and other data from NetApp Filers
	NwStat: various Novell Server data
	SAP: availability of important SAP services
	HP: check HP deskjet printers (toner empty, etc.)