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Nagios is an open source computer system monitoring, network monitoring and infrastructure monitoring software application. Nagios, originally created under the name NetSaint, was written and is currently maintained by Ethan Galstad along with a group of developers who are actively maintaining both the official and unofficial plugins.
The Nagios Plugins for Linux are intended to be run by NRPE, the Nagios Remote Plugin Executor, that "allows you to remotely execute Nagios plugins on other Linux/Unix machines. This allows you to monitor remote machine metrics (disk usage, CPU load, etc.)."
These plugins have been reported to also work with Icinga and Icinga2.
| Plugin Name | Detailed Informations |
|---|---|
| check_clock | Returns the number of seconds elapsed between local time and Nagios time |
| check_cpu | Checks the CPU (user mode) utilization |
| check_cpufreq | Displays the CPU frequency characteristics |
| check_cswch | Checks the total number of context switches across all CPUs |
| check_docker | Returns some runtime metrics exposed by Docker |
| check_fc | Monitors the status of the fiber status ports |
| check_filecount | Returns the number of files found in one or more directories |
| check_ifmountfs | Checks whether the given filesystems are mounted |
| check_intr | Monitors the total number of system interrupts |
| check_iowait | Monitors the I/O wait bottlenecks |
| check_load | Checks the current system load average |
| check_memory | Checks the memory usage |
| check_multipath | Checks the multipath topology status |
| check_nbprocs | Displays the number of running processes per user |
| check_network | Displays some network interfaces statistics |
| check_paging | Checks the memory and swap paging |
| check_podman | Returns some runtime metrics of Podman containers |
| check_pressure | Checks Linux Pressure Stall Information (PSI) data |
| check_readonlyfs | Checks for readonly filesystems |
| check_swap | Checks the swap usage |
| check_tcpcount | Checks the tcp network usage |
| check_temperature | Monitors the hardware's temperature |
| check_uptime | Checks how long the system has been running |
| check_users | Displays the number of users that are currently logged on |