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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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Prevent _grokparsefailure if one of the multipe groks match

I have this grok: grok { patterns_dir => "/etc/logstash/patterns/" break_on_match => false keep_empty_captures => true match => [ "message", "(%{EXIM_DATE:exim_date} )(%{EXIM_PID:exim_pid}…
Pi Wi
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grok filter (regex) to extract string within square brackets

My application log entries are given below: 2015-06-24 14:03:16.7288 Sent request message [649b85fa-bfa0-4cb4-8c38-1aeacd1cbf74] sometext 2015-06-24 14:38:05.2460 Received response message [649b85fa-bfa0-4cb4-8c38-1aeacd1cbf74]…
VinothNair
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GROK Pattern Works with GROK Debugger but not in Logstash GROK

I have a GROK pattern I am trying to use in Logstash that works within the GROK Debugger website but not within Log stash. I've tried different configurations with no success. I'm hoping someone can help me identify why this is not working. Input: …
Bouba TRAORE
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Grok RSpec test failing

I'm trying to get grok working with logstash but struggling to get off the starting block. I've tried to simplify things down to a succinct test which is here: require "test_utils" describe "basic grokking" do extend LogStash::RSpec config…
Matt Canty
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need custom fields of log through grok filter in logstash

I have logstash, kibana and elasticsearch installed on my system, with this filter configuration: filter{ if [type] == "syslog" { grok { match => { "message" => "%{SYSLOGTIMESTAMP:syslog_timestamp} %{SYSLOGHOST:syslog_hostname}…
Lavish
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Syslog forwared HAProxy logs filtering in Logstash

I'm having issues understanding how to do this correctly. I have the following Logstash config: input { lumberjack { port => 5000 host => "127.0.0.1" ssl_certificate => "/etc/ssl/star_server_com.crt" ssl_key =>…
Repox
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Logstash filter to convert "$epoch.$microsec" to "$epoch_millis"

I am trying to convert a timestamp field that is in the form $epoch.$microsec to $epoch_millis. Example: 1415311569.541062 --> 1415311569541 Logstash doesn't appear to have any means of multiplying numbers so ts * 1000 and casting to a long is…
Jason Trost
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Getting regex that grok filter is converted to?

I have a complex grok filter expression... is it possible to get the regex that this filter is converted to?
user626528
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Logstash custom date log format match

I have this log that print the date format that looks like this: = Build Stamp: 10:45:33 On Apr 4 2014 = So i have run the filter on grok debugger but still clueless on how to remove the word On grok { patterns_dir =>…
moalt wisp
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Logstash grok filter help - hexedecimal?

Ok im fishing out, amongst other things, the first segment of a unique ID from a log line with a grok filter, like this (Its only the first segment that I care about, throw away the rest). This segment is hex ,and I want it in binary. The…
user49411
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GROK Parsing with regex

I am using the following regexes: INT (?:[+-]?(?:[0-9]+)) VALUE ([0-9]+) SPACE \s* DATA .*? USERNAME [a-zA-Z0-9._-]+ YEAR (?>\d\d){1,2} MONTHNUM (?:0?[1-9]|1[0-2]) MONTHDAY (?:(?:0[1-9])|(?:[12][0-9])|(?:3[01])|[1-9]) HOUR…
user2359303
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Getting only the relevant part of a Kafka message as an input for Logstrash

I'm feeding Logstash with Kafka input. The messages look like this: "_index" : "progress", "_id" : "Q27Y2IYBIZUq2eJ6WJQR", "_score" : 1.0, "_source" : { "itemId" : 3, "weight" : 358, …
Martin Dvoracek
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Match multiple fields and variable fields in grok

I'm working on a project where I have to scan some log file of error from an apache server. I'm building a grok pattern to scan these error files. At the moment, this is my pattern: \[(?%{DAY:day} %{MONTH:month} %{MONTHDAY} %{TIME}…
FILIPPO REGGIANI
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Split log message on space for grok pattern

I am two days new to grok and ELK. I am struggling with breaking up the log messages based on space and make them appear as different fields in the logstash. My input pattern is: 2022-02-11 11:57:49 - app - INFO - function_name=add…
user6954761
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is it possible to split a nested json field value in json log into further sub fields in logstash filtering using mutate?

I have a json log like this being streamed into ELK { "event": "Events Report", "level": "info", "logger": "XXXXX", "method": "YYYYY", "report_duration": { "duration": "5 days, 12:43:16", "end": "2021-12-13 03:43:16", "start":…
Narendra522
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