Forked to use custom patterns. Added separate page for viewing loaded patterns.
nickethier / grokdebug Goto Github PK
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License: Other
Home Page: grokdebug.herokuapp.com
License: Other
It's not clear how to define a custom grok pattern to debug it.
Indications says that One per line, the syntax for a grok pattern is %{SYNTAX:SEMANTIC}
, but it's not the truth. The correct way is follow what it's declared in http://grokconstructor.appspot.com/do/match so
On each line you give a pattern name, a space and the pattern
Using grok variable names with [brackets] in them does not seem to work. This can make it harder to debug Logstash grok patterns as the brackets are used to define nested fields, e.g. [ingress][port]
.
Example
With sample:
[namespace/service-name:8080]
This works:
\[%{DATA:ingress_namespace}/%{DATA:ingress_service}:%{DATA:ingress_port}\]
This doesn't:
\[%{DATA:[ingress][namespace]}/%{DATA:[ingress][service]}:%{DATA:[ingress][port]}\]```
Does anybody know who maintains https://grokdebug.herokuapp.com/? It has been down for at least a week.
Line 10 in 7e108f4
A pattern like this: %{NUMBER:num:int} where the :int cause the output to be converted causes a "no matches". There is also :float according to the docs.
Workaround - remove type conversions whilst testing!
A simple note on the page would probably do the trick - it's a pattern debugger after all.
Input:<foo>bar</foo>
Pattern: %{GREEDYDATA:data}
Result: missing <foo> and </foo>
{
"data": [
[
"bar"
]
]
}
The application works excellent for developing and testing patterns.
A couple things that I think would greatly improve work flow (especially when building generic patterns files) would be:
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