Latest revision as of 06:27, 10 December 2019

Introduction

Simple Network Management Protocol (SNMP) is an Internet Standard protocol for collecting and organizing information about managed devices on IP networks and for modifying that information to change device behavior. Devices that typically support SNMP include cable modems, routers, switches, servers, workstations, printers, and more.

An SNMP-managed network consists of three key components:

• Managed devices
• Agent – software which runs on managed devices
• Network management station (NMS) – software which runs on the manager

EdgeSense SNMP-NMS

EdgeSense SNMP-NMS aims to collect  object data from SNMP managed device.

Feature:

• Support SNMPv1, SNMPv2c.
• support object type: OCTET STRING, Integer32, Integer, Unsigned32
• Currently support up-link object's value to WISE-PaaS , not support down-link from WISE-PaaS.

How to

Software Installation for Ubuntu 16.04

Install Steps:

1. Install OS - Ubuntu 16.04 (ex: ubuntu-16.04.5-desktop-amd64.iso)

2. Install MQTT Broker

Copy MQTT Broker install package (ex: MQTTBrokerSetup-1.0.4-Ubuntu_16.04-x86_64.run) to gateway.

$ sudo chmod +x MQTTBrokerSetup-1.0.4-Ubuntu_16.04-x86_64.run
$ sudo ./MQTTBrokerSetup-1.0.4-Ubuntu_16.04-x86_64.run

3. Install EdgeSense SNMP-NMS

Copy SNMP-NMS install package (ex: SNMP-NMS-1.0.0-Ubuntu_16.04-x86_64.run) to gateway.

$ sudo chmod +x SNMP-NMS-1.0.0-Ubuntu_16.04-x86_64.run
$ sudo ./SNMP-NMS-1.0.0-Ubuntu_16.04-x86_64.run

After installation, service will be autorun.

NOTE: Please wire the gateway to Internet with Network cable before install, it is necessary to install the dependencies. 

Uninstall Steps:

$ sudo /usr/local/EdgeSense/SNMP-NMS/uninstall.bash

4. Install WISE-PaaS agent

SNMP object list

Because MIBs file is not good to load in application, EdgeSense SNMP-NMS use JSON file to describe objects. Follow below format to describe objects you want to monitor in one SNMP device.

In Ubuntu 16.04 , SNMP object list file need to be put in this folder /usr/local/EdgeSense/SNMP-NMS/config/

Format:

name

• define object name

oid

• define object identifier
• This oid should be a unique instance number to the end of the OID, so that the EdgeSense SNMP-NMS can distinguish between the different objects.

type

• type follow SNMP object type, can be assigned to OCTET STRING, Integer32, Integer, Unsigned32

min

• define minimum value for object

max

• define maximum value for object

maxaccess

• maxaccess follow SNMP object maxaccess, can be assigned to read-only , read-write

Example:

Another tool PySMI is a good utility to turn your MIBs file into JSON file. More information about PySMI, please refer to this.

If you use PySMI to turn MIBs into JSON file, the oid in json file you may need to verify it is a unique instance number to the end of the OID.

Configuration

In Ubuntu 16.04

You can modify config file by vi

$ sudo vi /usr/local/EdgeSense/SNMP-NMS/config/snmp_config.json

or modify config file by gedit

$ sudo gedit /usr/local/EdgeSense/SNMP-NMS/config/snmp_config.json

Once config is changed , please restart service in order to apply new setting.

Config File as:

interval

• miniimum value is 5 second, maximum value is 600 second.
• default value is 20 second
• If setting is greater than maximum value or is less than minimum value, it will use default value.

Config for a SNMP Agent device include bellow parameter:

devid

• device id is an identifier, a prefix for SNMP object.
• Sensor ID will look like devid/object in the WISE-PaaS, ex: device1/firmwareVersion
  

ip

• assign IP of the SNMP Agent device

port

• assign port of the SNMP Agent device

snmpver

• assign SNMP ver of the SNMP Agent device
• value can be assigned to "1" or "2c"

community

• assign SNMP community of the SNMP Agent device

objectfile

• assign object file of the SNMP Agent device, converted by pysmi.
• need to be put on this folder /usr/local/EdgeSense/SNMP-NMS/config

Service control

In Ubuntu

Check if ​service is running:

$ sudo systemctl status SNMP-NMS.service

Restart ​service:

$ sudo systemctl restart SNMP-NMS.service

Start ​service:

$ sudo systemctl start SNMP-NMS.service

Stop ​service:

$ sudo systemctl stop SNMP-NMS.service

Tools

PySMI

PySMI is a open source tool, you could use it to turns MIBs into JSON documents.

Installation step:

$ sudo apt install python-pip
$ pip install pysmi

For more detailed information, please refer to PySMI official website.

Reference:

• how to get pysmi
• Download & Install pySMI

Turn MIBs file into JSON documentation

Usage:

mibdump.py --generate-mib-texts --destination-format json YOUR_MIB_FILE

example:

mibdump.py --generate-mib-texts --destination-format json ./device1.mib

Then a json file will be generated.

If it fail to convert your mib file to json, please make sure your MIBs file is valid. You may validate your MIBs file in the below website. 

You may need to fix severity level-1 error. For example: unknown object identifier.

• MIB Validate (from SimpleWeb)

You can edit this json file to add/remove object you want to poll from several SNMP agents.

Before upload this json file into your system, please make sure this json file is valid. You may paste json file's content in the below website to verify that is valid json file.

• Curious JSON Formatter & Validator

Use Case

Release

Above release files are available at local server, please paste file's url in File Explorer to copy file. Refer to Access EdgeSesense release folder.