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# Nagios Plugins for Linux

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---------------

![alt tag](https://madrisan.files.wordpress.com/2015/11/nagios-plugins-linux-logo-256.png)


## About

This package contains several `nagios plugins` for monitoring Linux boxes.
Nagios is an open source computer system monitoring, network monitoring and infrastructure monitoring software application (see: http://www.nagios.org/).

Here is the list of the available plugins:

* **check_clock** - returns the number of seconds elapsed between local time and Nagios server 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** - checks the number of running docker containers :new: (:warning: *alpha*, requires *libcurl* version 7.40.0+)
* **check_fc** - monitors the status of the fiber status ports
* **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** - monitor the status of podman containers :new: (:warning: *beta*, requires *libvarlink*)
* **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 

## Full documentation

The full documentation of the `nagios-plugins-linux` is available online
in the GitHub [wiki page](https://github.com/madrisan/nagios-plugins-linux/wiki).

## Installation

This package uses `GNU autotools` for configuration and installation.

If you have cloned the git repository then you will need to run
`autoreconf --install` to generate the required files.

Run `./configure --help` to see a list of available install options.
The plugin will be installed by default into `LIBEXECDIR`.

It is highly likely that you will want to customise this location to
suit your needs, i.e.:

        ./configure --libexecdir=/usr/lib/nagios/plugins

The plugin `check_multipath` grabs the status of each path by opening a
connection to the multipathd socket.  The default value is currently set to
the Linux abstract socket namespace `@/org/kernel/linux/storage/multipathd`,
but can be modified at build time by using the option `--with-socketfile`.

Example (RHEL5 and RHEL6 and other old distributions):

        ./configure --with-socketfile=/var/run/multipathd.sock

After `./configure` has completed successfully run `make install` and
you're done!

You can also run the (still incomplete) set of bundled unit tests by entering
the command `make check` (or `VERBOSE=1 make check`) and, if the llvm tool
`scan-build` is installed on your system, a `make -C tests check-clang-checker`
to get a static code analysis report (for developers only).

_Note_: you can also pass the _experimental_ option `--enable-libprocps` to
`configure` for getting the informations about memory and swap usage through
the API of the library `libprocps.so.5`
([procps newlib](https://gitlab.com/procps-ng/procps/tree/newlib)).
This library is still under active development and no stable version has
been released yet. 

## Supported Platforms

This package is written in plain C, making as few assumptions as possible, and
sticking closely to ANSI C/POSIX. 
A C99-compliant compiler is required anyway.

This package is known to compile with:
* gcc 4.1 (RHEL 5 / CentOS 5),
* gcc 4.4 (RHEL6 / CentOS 6),
* gcc 4.8 (RHEL7 / CentOS 7),
* gcc 3.x, 5.1, 5.3, 6.3, 7.x, 8.x, 9.x, 10.x (openmamba GNU/Linux, Debian 8+, Fedora 25+),
* clang 3.7, 3.8, 4.9, 5.x, 6.x, 7.0, 8.0, 10.0.0 (openmamba GNU/Linux, Fedora 25+),

List of the Linux kernels that have been successfully tested:
* 2.6.18, 2.6.32,
* 3.10, 3.14, 3.18,
* 4.2, 4.4, 4,9, 4.14, 4.15, 4.16, 4.19
* 5.6, 5.7

## CentOS/RHEL, Debian, and Fedora Packages

The `.rpm` and `.deb` packages for CentOS/RHEL, Debian, and Fedora can be built using the following commands

Command            | Distribution
------------------ | ------------
CentOS 5           | `make -C packages centos-5`
CentOS 6           | `make -C packages centos-6`
CentOS 7           | `make -C packages centos-7`
CentOS 8           | `make -C packages centos-8`
Debian 8 (Jessie)  | `make -C packages debian-jessie`
Debian 9 (Stretch) | `make -C packages debian-stretch`
Debian 10 (Buster) | `make -C packages debian-buster`
Fedora 30          | `make -C packages fedora-30`
Fedora 31          | `make -C packages fedora-31`
Fedora 32          | `make -C packages fedora-32`
Fedora Rawhide     | `make -C packages fedora-rawhide`

in the root source folder.
The building process requires the _Docker_ software containerization platform running on your system, and an internet connection to download the Docker images of the operating systems you want to build the packages for.

On *Fedora 31* and *Fedora 32* you can use the native *Podman* pod manager along with the Docker CLI emulation script:

    sudo install dnf podman podman-docker

_Note_: the previous make commands can end with a `permission denied` error if *selinux* is configured in enforcing mode.
In this case you can temporarily disable *selinux* by executing as root the command `setenforce 0`.

## Gentoo Package

The plugins are available [in the Gentoo tree](https://packages.gentoo.org/packages/net-analyzer/nagios-plugins-linux-madrisan). They can be installed by running:
```
emerge -av net-analyzer/nagios-plugins-linux-madrisan
```
The USE flags `curl` and `varlink` are required to respectively build `check_docker` and `check_podman`.

## Bugs

If you find a bug please create an issue in the project bug tracker at
[GitHub](https://github.com/madrisan/nagios-plugins-linux/issues)
