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NMIS8 includes powerful capabilities for performance and operational thresholding, which greatly enhance network management capabilities.  These thresholds result in alerts/events/notifications which NMIS can send when it sees a threshold breached.  The thresholds have very granular controls which by default have been configured fairly broadly.

A list of standard thresholds NMIS includes is available in NMIS Threshold Configuration 

A simple example of this is that you will likely what to be notified when the CPU is high on a Core device, vs an Access switch in Timbuktu.  This is part of the NMIS idea of relevance of information in general, not all devices are created equal, some devices deserve better alerting, people of course are created equal.

If you want to just modify and add new thresholds reach the first section "Using the NMIS GUI to Configure Thresholds", the second section "About Threshold Controls" goes into more details about thresholds.

As always thanks to our commercial customers who support everyone who use NMIS8, including the creation of documentation and these great features, if you are interested in commercial support, please email contact@opmantek.com

Using the NMIS GUI to Configure Thresholds

Access the NMIS Models GUI

Access the GUI by clicking on the menu "System -> System Configuration -> NMIS Models", the "NMIS Models" widget will be displayed as shown below.  Now this is a BIG form, so clicking on the POP OUT button will place it in its own browser TAB/Window.  This is application in NMIS 8.4.8G and onwards.

NMIS 8.4 Example

NMIS 8.6 Example

Select the Model and Section to Modify

I have selected the POP OUT and am looking at a full browser form.  Select the Model you want to modify, if you are not sure, select the Node, then select the "Threshold" section of the model.

Note:  In NMIS 8.6 the 'Select node' pull down menu is not available.  This menu was deemed a bit mis-leading as it only assisted in determining model and did not apply a change to a particular node.

Select the Threshold to Add a Controlled Select

In this example we will add a select section, which will be controlled to only work on a specific device named "meatball" and the interface is "Dialer1".  To do this we are going to hi-jack the the threshold in the first position and edit the control.  This is because these selects are executed in order and we need ours to be first, this is like an access list on a router or firewall.  We will add another in position 10 when we are done.  I will also update the default models to have gaps in the orders.......

Editing the Control

Now we just change the control to be the string "$node eq "meatball" and $ifDescr eq "Dialer1"" and click "Edit".

A New Control is Available

Now we can tune the thresholds by clicking "edit" on the one we want to change,

Changing a Threshold

Lets change the warning to be 65%, then click "Edit"

Updated Threshold for Warning

Now the warning level is set to 65%

Applying the Thresholds

The thresholds will be run on the next poll cycle or when they have been configured to run.  You can run them on demand from the command line, with the following command (meatball is my router here, so change for your device).

Adding a New Select Block

Now we need to add back the one we hi-jacked.  So we add a new select block, click "add".

Setting the Order and Thresholds

I am going to set this one as 10, it will happen after the others but before the default, complete all the details you require in the form and click "Edit"

Adding a Control

We need to add a control field now, so on the new select section 10, click add

Complete the details in the control "$ifSpeed <= 5000000 and $ifSpeed >= 1000000" and click add.

New Threshold Select Added

Now we have the old hi-jacked threshold created anew ready for low speed thresholding.

About Threshold Controls

Simple Thresholds

In NMIS a simple threshold is defined by the following:

  • the name
  • the event name (which must begin with the phrase "Proactive" for correct event handling)
  • a select (with a default and optionally more)
  • default threshold values

In the file /usr/local/nmis8/models/Common-threshold.nmis this looks like this:

Have a set of thresholds for Core CPU

BUT Core devices are more sensitive to CPU Load.  So we want to use a different set of threshold values.  Something like:
  • 'critical' => '60',
  • 'fatal' => '70',
  • 'minor' => '40',
  • 'warning' => '30',
  • 'major' => '50'
But how to make these apply just to Core devices?

Advanced Thresholds with Controls

For example, different thresholds for core devices.  Looking in Common-thresholds will give you some ideas, but you can add many “selects” and have properties like:
  • $name
  • $node
  • $host
  • $group
  • $roleType
  • $nodeModel
  • $nodeType
  • $nodeVendor
  • $sysDescr
  • $sysObjectName
  • others for interface
  • Almost unlimited possibilities.

So we can create a more specific threshold for core devices (NMIS has this already configured by default).

These are executed in the select order, and if no control is matched, then the default set is used.

Advanced Control Options

The following are the available control options

Node Properties

  • $name
  • $node
  • $host
  • $group
  • $roleType
  • $nodeModel
  • $nodeType
  • $nodeVendor
  • $sysDescr
  • $sysObjectName

 

Indexed Objects like interfaces

  • $ifAlias
  • $Description
  • $ifDescr
  • $ifType
  • $ifSpeed
  • $ifMaxOctets
  • $maxBytes
  • $maxPackets
  • $entPhysicalDescr

Newly added indexed objects in NMIS 8.6G

  • $hrStorageDescr 

  • $hrStorageType 

  • $hrStorageUnits (disk block size)  

  • $hrStorageSize (disk size in blocks) 

  • $hrStorageUsed (disk used in blocks) 

  • $hrDiskSize  (disk size in bytes, hrStorageSize * hrStorageUnits)

  • $hrDiskUsed (disk used in bytes, hrStorageUsed * hrStorageUnits) 

  • $hrDiskFree (disk free in bytes) 

Sample Controls

The crontrols are little pieces of code which will be evaluated when needed, so you might want to do the following sorts of things

 

ResultControl
Apply the threshold to all devices in the group "Sales"$group eq "Sales"
Apply the threshold to all devices starting with the IP address 192.168$host =~ /192\.168/
Apply the threshold to all Cisco IOS devices$sysDescr =~ /Cisco IOS/
Use this threshold if the interface speed is between 1 and 5 megabits/second$ifSpeed <= 5000000 and $ifSpeed >= 1000000
Use this threshold if the interface speed is 10 megabits$ifSpeed == 10000000
Use this threshold if the interface speed is 100 megabits$ifSpeed == 100000000
Use this threshold if the interface speed is 1 gigabits$ifSpeed == 1000000000
Use this threshold if the disk is larger than 100 gigabytes

$hrDiskSize >= 104857600000