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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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Retain tag/field across events in logstash 1.5

I'm using logstash 1.5 to analyze logs. I want to track two events which occur one after the other. So I would like to set a flag/field/tag when first event occurs and retain the value across events. I looked at this link but looks like grep and…
Yellowjacket
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How to distinct grok filter for similar logs

I have this to kind of logs for dhcpack: Jun 30 06:34:18 HOSTNAME dhcpd: DHCPACK to IP (MAC) via eth2 Jun 30 06:34:28 HOSTNAME dhcpd: DHCPACK on IP to MAC via eth2 How can I use grok, to use two different matches? I have these two matches for…
Miguel Bessa
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How to write grok filter in logstash to accept variable arguments

How to write grok filter rule, if message contains transactions of variable arguments. For example: 22-Jun-2015 04:45:56 Transaction for Bill 123 item1=100 item2=200 item3=300 22-Jun-2015 05:45:23 Transaction for Bill 124 item1=200 22-Jun-2015…
Viswesn
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Parsing dynamically using Logstash

Im trying to parse a dynamic text using logstash and i encounter this problem: For example, take a look at this text: number(s) 1 In case i have only one number i can easily put it into a variable and the parsing would look like this: grok { …
dan dan
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Grok Pattern for Domain name in a list

I tried to write an own grok pattern for domain name. But couldn't create it. Someone help me on this. data format : ["test1.example.com", "test2.example.com", "test3.example.com", "new1.example.com", "new2.example.com", "new3.example.com",…
KMG
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Logstash Grok Filter Spit and put in seperate buckets in Elastic Index

Hi I have a log line say like"APPLE" AND "BANANA" AND "MANGO" OR "GRAPES" I want it to mutate like and split to put in elastic , so elastic should have a equivalent as options{ fruits :{ 'APPLE','BANANA','MANGO','GRAPES' }, …
Kumar Pallav
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Regex Fails when space is removed in grok debugger

I'm trying to extract date from a log file entry: ...... Date is:2015-06-09 ........ using grok debugger for logstash. The regex I'm using is (?<=Date is:)[0-9\-]*\s? This regex works on regex101 but there aren't any matches in grok…
Yellowjacket
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Grok parse error when using custom pattern definitions

I'm trying to use a grok filter in logstash version 1.5.0 to parse several fields of data from a log file. I'm able to parse a simple WORD field with no issues, but when I try to define a custom pattern and add that in as well, the grok parse…
IJBurgess
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Could not load : can't convert nil into String

I want to read logs only after a particular date. My approach is to drop all the events previous to that date. I try to achieve it like this: I am dropping all logs before June 1, 2015: Logstash config file: input { file{ …
Siddharth Trikha
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Mysterious grok filter syntax error

So I have the following logstash filter config file. filter { if [type] == "syslog" and [message] =~ "diskstation" { grok { match => { "message" => "<%{POSINT:syslog_pri}>%{INT:version} %{TIMESTAMP_ISO8601:timestamp}…
ardevd
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Logstash grok filter custom date

Im working on writing a logstash grok filter for syslog messages coming from my Synology box. An example message looks like this. Jun 3 09:39:29 diskstation Connection user:\tUser [user] logged in from [192.168.1.121] via [DSM]. Im having a hard…
ardevd
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I don't know how to filter my log file with grok and logstash

I have an small java app that loads logs similar to these ones bellow: Fri May 29 12:10:34 BST 2015 Trade ID: 2 status is :received Fri May 29 14:12:36 BST 2015 Trade ID: 4 status is :received Fri May 29 17:15:39 BST 2015 Trade ID: 3 status is…
BYoussef
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How to compare and fetch fields from multiple log files using elasticsearch.rb filter

I am parsing two differnt log files in logstash and storing it in different index. 2015-02-26 90000 …
Mangoski
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Logstash pattern for log4j

I'm setting up Elasticsearch, Logstash and Kibana. I encountered an error when I am configuring "logstash.conf". Here's the error I got. {:timestamp=>"2015-05-25T21:56:59.907000-0400", :message=>"Error: Expected one of #, {, ,, ] at line 12, column…
Ronald Flores
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Logstash Grok filter getting multiple values per match

I have a server that sends access logs over to logstash in a custom log format, and am using logstash to filter these logs and send them to Elastisearch. A log line looks something like this: 0.0.0.0 - GET / 200 - 29771 3 ms…
bioball
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