Rename SNMP input fields

Graylog Central (peer support)
1

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1. Describe your incident:
i can’t rename SNMP UDP input fields after translate them with MIBs files

2. Describe your environment:

  • OS Information:
    Ubuntu 18.04.3
  • Package Version:
    Graylog 3.1.3
  • Service logs, configurations, and environment variables:

SNMP UDP input

3. What steps have you already taken to try and solve the problem?

rule "rename_field"
when
   has_field("snmp_1_3_6_1_4_1_2011_2_15_1_7_1_1_0") AND
contains(to_string($message.gl2_source_input), "62161baa49885931b58ba41f", true)
then
     rename_field("snmp_1_3_6_1_4_1_2011_2_15_1_7_1_1_0","alarm_source");
end

or

rule "rename_field"
when
   has_field("snmp_1_3_6_1_4_1_2011_2_15_1_7_1_1_0") AND      contains(to_string($message.gl2_source_input), "62161baa49885931b58ba41f", true)
the
     let alarm_source = to_string($message.snmp_1_3_6_1_4_1_2011_2_15_1_7_1_1_0);
     set_field("alarm_source", alarm_source);

4. How can the community help?

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2

Are you sure the message has a gl2_source_input field? Also, it always helps if you post the original message… and use the </> tool around code to make it readable… (I did </> for you)

You could use the debug() function to figure out what is going on in your rule:

 rule "rename_field"
when
   has_field("snmp_1_3_6_1_4_1_2011_2_15_1_7_1_1_0")                                   AND
   contains(to_string($message.gl2_source_input), "62161baa49885931b58ba41f", true)
then
     debug("==================================================================================================================");
     debug(concat("++++ my gl2 field should have 62161baa49885931b58ba41f in it: ",to_string($message.gl2_source_input)));
     debug(concat("++++ my snmp field contains: ",to_string($message.snmp_1_3_6_1_4_1_2011_2_15_1_7_1_1_0)));
//
     rename_field("snmp_1_3_6_1_4_1_2011_2_15_1_7_1_1_0","alarm_source");
//
     debug(concat("++++ my NEW field contains: ",to_string($message.alarm_source)));
     debug("==================================================================================================================");
end

Then watch what happens in your Graylog log file:

tail -f /var/log/graylog-server/server.log

1 Like
3

many thanks…

by debug our rule we found as below that the message went to pipeline before translating with their MIBs

2022-03-13T13:15:02.385+02:00 INFO [Function] PIPELINE DEBUG: ==================================================================================================================
2022-03-13T13:15:02.385+02:00 INFO [Function] PIPELINE DEBUG: ++++ my gl2 field should have 62161baa49885931b58ba41f in it: 62161baa49885931b58ba41f
2022-03-13T13:15:02.385+02:00 INFO [Function] PIPELINE DEBUG: ++++ my snmp field contains:
2022-03-13T13:15:02.385+02:00 INFO [Function] PIPELINE DEBUG: ++++ my NEW field contains:
2022-03-13T13:15:02.385+02:00 INFO [Function] PIPELINE DEBUG: ==================================================================================================================

by the way our Message Processors Configuration is as below:

# Processor Status
1 AWS Instance Name Lookup active
2 Message Filter Chain active
3 Pipeline Processor active
4 GeoIP Resolver disabled
1 Like
4

Great! Mark it as the answer for future searchers!! :slight_smile:

5

Sorry but it still not solved,
as i mentioned :

by debug our rule we found that the message went to pipeline before translating with their MIBs

i need to solution to change the name of attribute comes from MIBs files

6

OK, not the answer, I had thought “many thanks” meant it was. It is not clear to me what you are explaining. I don’t know what pipeline you are speaking of, the one with the rule or another one? If the fields are not there in the debug rule I posted then either it is not there at that point and you need to shift your change field rules somewhere else or figure out why those fields not there. I do not know anything about the flow of your data, what it looks like coming in or what is actually in the message until you post it.

7

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