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# Devmon 
  Devmon is an open-source SNMP monitor tool that can graph and alert
  several hundreds of devices per minutes 


## General Information
- Devmon is a Perl daemon designed to enhance the SNMP monitoring capabilities of a server running Xymon monitoring software
- Devmon takes the data that it obtains via SNMP and applies user-defined logic against it and compares the results to user-customizable thresholds. It uses the final data to determine if the remote device is in an abnormal or critical state, and reports accordingly to the Xymon display server. 
- Devmon provides a solution that is very efficient, fault-tolerant, scalable and maintainable.
- Devmon supports a flexible, user-customizable template system, which allows an end user with little or no programming knowledge to easily create test logic for any number of different types of devices.




## Technologies Used
- Xymon
- SNMP
- Perl5
- MySQL (for multi-node configuration)

## Features

- Multithread polling engine 
  - Devmon is able to spawn a user-configurable number of child processes to offload the SNMP v1,v2c,v3 query workload to. This allows for the rapid query of a large number of remote devices.
- Device discovery process 
  - Scan each device for any SNMP security authentication combination and store it in a persistent storage until a re-scan is performed
- A scalable tool
  - For smaller networks (<200 devices), Devmon can be run in a "single node" configuration, and can be run from the same server as the Xymon display server. 
  - For larger, enterprise networks, Devmon can run in a 'multi node (cluster)' configuration (WIP), with all nodes using a MySQL back-end server (which can also be a cluster, for maximum fault tolerance) for data storage, load balancing, and fault tolerance or simply in "single node" in its own dedicated server (recommended so far)



## Screenshots
![Example screenshot](/fr/devmon_current_status.png)
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## Setup
- In order for Devmon to do anything useful, you will need a machine capable of running the Perl interpreter, which is used to execute the Devmon code. Please consult the INSTALLATION file located in the docs directory.
- In addition, you will need a machine (either the same machine running Devmon, or a different one) running the Xymon monitoring program, which displays the messages that Devmon generates.
- Finally, you will need your to have your Xymon program set up to monitor at least one host that Devmon has a template for. Only then will Devmon be able to poll a remote host and display the results. For more information on Devmon's template system, please consult the TEMPLATES file located in the docs directory.


## Usage
How does one go about using it?
Provide various use cases and code examples here.

`write-your-code-here`


## Project Status
- The project is: _in progress_ 
- Version is still < 1 (as we can guaranty backward compatibility with previous version)


## Room for Improvement
- There ara many areas that need improvement or could be improved. 
- Some a listed in github issues
- Feel free to add your own 

## Acknowledgements
Many thanks to all developers or friendly poeple that work or did work on this version or previous one
- Henrik Stoerner
- Steve Aiello
- Dan Vande More
- Craig Boyce
- Buchan Milne
- Wim Nelis
- Stef Coene
- And all others I dont know 
(if you want to be listed or not make an issue)

And also many thanks to Xymon developpers!




## Contact
Created by [@flynerdpl](https://www.flynerd.pl/) - feel free to contact me!


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