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opEvents provides the ability for the user adminstrator to set customise an event properties as events are received. 's properties from a variety of inputs. For example, if a user wanted to set a specific priority for an event it can be done hereduring the input parsing stages. This article will provide a methodology for creating events from SNMP traps, via a generic extensible parser with EventParserRules.
The generic parser rules are defined in adding SNMP trap parsing to EventParserRules. EventParserRules.nmiswhich is found in the configuration directory /usr/local/omk/conf directory. Read Please read the notes at the top of this file first as they are very informative as to what is possible in regard to the parser rules.
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For this discussion we will assume that the concept of 'state' is desirable. i.e. If there is a "down" event, there should be a corresponding "up" event. , and opEvents should keep track of the state and ignore duplicate inputs. (It is possible that several "down" events could share a single "up" or clearing event.)
State
opEvents tracks state based on a tuple of three event properties.
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opEvents will process the trap log file as specified on opCommon.nmis. When parsing the traps, at least the following properties should be extracted.:
- date
- host
- trap
- details
- event
- element
- stateful
- state
- priority
The install shipped version of of EventParserRules.nmis has a traplog section that will extract the date, host, trap and details fields for most situations.
This article will focus focuses on situations where customers want customization for the remaining fields.
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Notice the regular expression will catch an number of digits following the '=' character. This rule 'captures' the element. In this way we can dynamically assign event properties based on a regular expression.
Set Other Properties
Generally the other properties that we wish to set can be done with one rule. Consider the following trap received by opEvents.
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