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Questions tagged [logstash-grok]

Grok is an abstraction on top of regular expressions to allow easy parsing of unstructured text into structured and queryable form.

Parse arbitrary text and structure it.

Grok is a great way to parse unstructured log data into something structured and queryable.

This tool is perfect for syslog logs, apache and other webserver logs, mysql logs, and in general, any log format that is generally written for humans and not computer consumption.

Logstash ships with about 120 patterns by default. You can find them here: https://github.com/logstash-plugins/logstash-patterns-core/tree/master/patterns. You can add your own trivially. (See the patterns_dir setting)

If you need help building patterns to match your logs, you will find at:

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Logstash 2.1.0 - Not able to modify @timestamp

I have a logstash filter configuration as below: filter{ ... date { match => [ "timestamp", "yyyy-MM-dd HH:mm:ss,SSS" ] target => "@timestamp" add_field => { "debug" => "timestampMatched"} } ... } When it…
Arpit Aggarwal
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Logstash and grok : Variables name determined from input

I want to send multiple different syslog from my F5 LTM but I would to be able to send any kind of information without changing my Logstash configuration all the time. For example today I have two iRules which can send two types of logs: <134>Dec 16…
timmalos
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Logstash jdbc plugin understanding

Can anyone explain what does add_field do ? filter { mutate { add_field => { "%{column1}" => "column2" } } } What is the difference between add_field present in mutate, clone, kv and grok plugins
sri
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Logstash custom log parsing

Need your help in custom log parsing through logstash Here is the log format that I am trying to parse through logstash 2015-11-01 07:55:18,952 [abc.xyz.com] - /Enter, G, _null, 2702, 2, 2, 2, 2,…
Ganga
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How to write logstash multiline for interlaced log lines from different process threads based on a dynamic identifier

dummy logfile: [1] test123 [2] test234 [3] test345 [2] test321 [1] test432 [3] test058 [1] test002` expected result from multiline to merge lines with same id and consider as single event. [1] test123 [1] test432 [1] test002
Vishal
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How to remove one or more fields in logstash using ruby based on field contents?

I have a log line which contains json data, I am applying the json filter and then mutate to parse it. What I need to do is Loop through each parsejson field If the value the field contains is "%{[parsedjson]" + fieldname itself remove it. For…
bingbon
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Two different syntax in grok

A normal event could be like this: 2015-11-20 18:50:33,739 [TRE01_0101] [76] [10.117.10.220] but sometimes I have a log with "default" IP: 2015-11-04 23:14:27,469 [TRE01_0101] [40] [default] If I have defined in grok a [SYNTAX:SEMANTIC] pattern…
user3228279
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Logstash Grok parser

I'm new to the log-stash and grok, I need to parse very custom log files. I can't find anywhere a good tutorial to get this done. Tried the syslog example but it's not working in my case. Example: Nov 19 00:06:37 srv-fe-05 ssh-server-g3: 2037…
Dmitry R
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Logstash - grok is not parsing double digit float values

Grok is able to parse float values with single digit like 1.2 using BASE16FLOAT but throws [0] "_grokparsefailure" when parsing double digit like 12.5 Example: works for the log event 02:10:28 CPU Util %: 0.1 / 0.2 / 0.6 Disk Util %: …
ynskrishna
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Logstash and Grok always show _grokparsefailure

I am using https://grokdebug.herokuapp.com/ to build grok filters for logstash, but even though grokdebug shows corrected parsed message, my kibana showing _grokparsefailure message [2015-12-01 08:53:16] app.INFO: Calories 4 [] [] pattern…
ssuperczynski
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How can I push logs from tomcat servers to Kafka cluster?

Currently I use redis -> s3 -> elastic search -> kibana stack to pipe and visualize my logs. I want to bring kafka cluster in this stack and push data from app nodes to kafka cluster. How exactly can I do this?
kooshals
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Issue in reading log file that contains date in it's name

I have 2 linux boxes setup in which 1 box contains one component which generates log and logstash installed in it to transfer the logs. And in other box I have redis elasticsearch and logstash. here logstash will act as logstash indexer to grok the…
Amit Gawali
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Logstash Filter : syntax

Ive recently began learning logstash and the syntax is confusing me. eg : for match i have various codes: match => [ "%{[date]}" , "YYYY-MM-dd HH:mm:ss" ] match => { "message" => "%{COMBINEDAPACHELOG}" } match => [ "timestamp" ,…
Mishal Harish
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Grok recreate timestamp and message

I'm trying to create a grok pattern for the following formats: October 27, 2015 03:44: lorem created a new project "lorem / ipsum" October 27, 2015 03:48: lorem created a new project "lorem / ipsum-cp" October 27, 2015 18:38: john created a new…
FBidu
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Get count of values in kibana with special characters

So I followed what was answered in How to retrieve unique count of a field using Kibana + Elastic Search which helped out alot. The terms panel was exactly what I needed, but I'm having a slight problem. I'm trying to get the count of each…
Danny
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