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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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Multiple patterns in one log

So I wrote now several patterns for logs which are working. The thing is now, that I have these multiple logs, with multiple patterns, in one single file. How does logstash know what kind of pattern it has to use for which line in the log? ( I am…
BoJack Horseman
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Logstash grok pattern for space field

Hi How to write a grok expression for the below log [2017-03-25T00:00:07,137][WARN ] match => { "message" => "\[%{TIMESTAMP_ISO8601:timestamp}/]/[%{LOGLEVEL:log-level}\s*\]" } Is this correct , how to write space in grok ? Thanks
user6826691
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Logstash Grok pattern with double quotes

I am parsing proxy logs with Logstash and its Grok filter. The logs contain quoted strings : 1438120705 [.....] "SEF-EDP8" - "C" "/GPM/1023/5745-7/456V/" With the Grok Debugger the following pattern works like a charm : %{NUMBER:ts} [......]…
c-val
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Is there any existing grok{} pattern for date format YYYY/MM/DD HH:mm:ss?

I was checking the nginx error logs at our server and found that they start with date formatted as: 2015/08/30 05:55:20 i.e. YYYY/MM/DD HH:mm:ss. I was trying to find an existing grok date pattern which might help me in parsing this quickly but…
Mandeep Singh
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Multiple Grok Filters not storing first filter match record

I am using Logstash to parse postfix logs. I am mainly focused to get bounced email logs from postfix logs, and store it in database. In order to get logs, first I need to find ID generated by postfix corresponding to my message-id, and using that…
Pritish Shah
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Use grok to add the log filename as a field in logstash

I'm using Grok & Logstash to send access logs from Nginx to Elastic search. I'm giving Logstash all my access logs (with a wildcard, works well) and I would like to get the filename (some part of it, to be exact) and use it as a field. My config is…
tchap
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using Grok to skip parts of message or logs

I have just started using grok for logstash and I am trying to parse my log file using grok filter. My logline is something like below 03-30-2017 13:26:13 [00089] TIMER XXX.TimerLog: entType [organization], queueType [output], memRecno =…
aniket goundaje
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Need information on Grok patterns that use non capturing group (?: )

I understand the concept of writing regular expressions using capturing and non-capturing groups. Ex: a(b|c) would match and capture ab and ac a(?:b|c) would match ab and ac but capture a But how is it useful when I make a new custom grok pattern…
sruthi
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How can I drop an empty line in logstash

In my logstash logs I have sometimes empty lines or lines with only spaces. To drop the empty line I created a dropemptyline filter file # drop empty lines filter { if [message] =~ /^\s*$/ { drop { } } } But the empty line filter…
Vad1mo
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logstash: multiple logfiles with different pattern

We want to set up a server for logstash for a couple of different project in our company. Now I try to enable them in Kibana. My question is: If I have different patterns of the logfiles, how can I build for them a filter? example:…
user3300940
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Logstash reports [0] _grokparsefailure when parsing logs

I have logs that come in from that are in this format. I have assigned the logstash variable to the pattern below. I believe that I have each of these elements assigned properly with the predefined Grok tags that come with it. However when I run…
Cole Shores
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LogStash - Failed to instantiate type net.logstash.logback.appender.LogstashTcpSocketAppender

I am working on Springboot Microservcies & for monitoring Im using ELK Stack. I am using docker containers for running ELK as per this guide. ELK is up and running, I am starting my Logstash by, docker run -d -it --name logstash -p 5000:5000…
John Seen
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What should be the logstash grok filter for this log4j log?

I've been asked to consolidate our log4j log files (NOT using Socket calls for now) into a Logstash JSON file that I'll then feed to Elasticsearch. Our code use the RollingFileAppender. Here's an example log entry. 2016-04-22 16:43:25,172 ERROR…
Chris F
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Parse logs containing python tracebacks using logstash

I have been trying to parse my python traceback logs using logstash. My logs look like this: [pid: 26422|app: 0|req: 73/73] 192.168.1.1 () {34 vars in 592 bytes} [Wed Feb 18 13:35:55 2015] GET /data => generated 2538923 bytes in 4078 msecs (HTTP/1.1…
Keshav Agarwal
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Logstash Grok Filter Apache Access Log

I have been looking around here and there, but could not find the working resolution. I try to use Grok Filter inside the Logstash config file to filter Apache-Access log file. The log message looks like this: {"message":"00.00.0.000 - -…
O Connor
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