LockedHow To - Configure a monitored device which depends on another device

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2007/08/20 21:11:26 (permalink)
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How To - Configure a monitored device which depends on another device

IPSentry provides a method to set devices to be checked depending on the status of another device.  This feature is known as a dependency.
 
Say for instance that you are monitoring several web servers that reside on the other side of a critical router.  There may be no need to attempt access to the web servers if you know the router is non-functioning.  This presents us with an ideal case for a dependency structure where the web servers should not be checked if the router is down.
 
In this example, we will make a couple of assumptions.

  • You have already configured three web server entries for the servers WEB_A, WEB_B, WEB_C

  • You have configured a monitoring entry for ROUTER_A using simple ICMP-Ping.

  • You have configured the alert functions of each.

The only task remaining is to tell IPSentry that WEB_A, WEB_B, and WEB_C should only be checked if ROUTER_A is accessible.
 
To accomplish this, the following steps provide the quickest solution.

  1. From the IPSentry active display console, select Action, Edit Devices.
     

  2. Drag WEB A device onto ROUTER A

  3. Drag WEB B device onto ROUTER A

  4. Drag WEB B device onto ROUTER A
     

The above will cause the following scenario to exist.

ROUTER_A is checked
If OK - WEB_A, WEB_B, and WEB_C are checked.
If ROUTER_A fails, alerts are triggered and WEB_A, WEB_B, WEB_C are skipped due to ROUTER_A failure.

This can go even a step further such that ROUTER_A is dependent on yet another device - ROUTER_B. You can then simply drag ROUTER A onto ROUTER B. This would then cause the following scenario.

ROUTER_B is checked.
If OK - ROUTER_A is checked
If OK - WEB_A, WEB_B, and WEB_C are checked.

Notice that in the above case, WEB_A, WEB_B, WEB_C are only checked if BOTH ROUTER_B and ROUTER_A are accessible.
 
Note:  The limit of nesting level of dependencies is 50 devices however, the number of devices that can be tied to a parent is not limited.

---
IPSentry Support
RGE, Inc.
http://www.ipsentry.com
http://forum.ipsentry.com

IPSentry® is a Registered Trademark of RGE, Inc.
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