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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 - grok configuration filter

I am trying to filter the output of the "last" command using grok. The grok pattern is only matching the first variable "user" . It is not matching any pattern after it. Can you please let me know what i am missing here. Log: sam pts/0 …
shrilesh.naik
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Multiline filter with match creates duplicates in logstash

I stuck this issue for last 2 days. I am using using logstash to receive logs from the forwarder.I am using multiline filter to match the logs and parse the logs using grok pattern.All are working fine. Except the last line of log. multiline { …
user1677237
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Logstash grok filter integer

I need to index numerical data in my ElasticSearch DB and i'm using grok filter to parse the log line (which is all comma separated integers). trying to use this format %{NUMBER:userID_2:int} did not work and no data was indexed and no exception…
Eitan Vesely
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Unable to get GROK pattern to match even though it tests properly

I am a new Logstash user and I am starting to write some grok rules to parse out my asa log files. I have a few rules triggering properly, and I am unable to get one to parse properly event though I test it out in grok debugger and it always tests…
Craig
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logstash grok parse user agent string parse certain fields

I have this UA in a log file Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2267.0 Safari/537.36 Now all I really want is to grab things like Windows NT 6.1 (i.e. win7) and WOW64 i.e. 64 bit system. My current…
Killerpixler
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Logstash: How to use date/time in a filename as an imported field

I have a bunch of log files that are named as 'XXXXXX_XX_yymmdd_hh:mm:ss.txt' - I need to include the date and time (separate fields) from the filename in fields that are added to Logstash. Can anyone help? Thanks
AMC
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Logstash 1.4.2 grok filter: _grokparsefailure

i am trying to parse this log line: - 2014-04-29 13:04:23,733 [main] INFO (api.batch.ThreadPoolWorker) Command-line options for this run: here's the logstash config file i use: input { stdin {} } filter { grok { match => […
sally
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how to match several possible log events formats?

I have events from one log source which can have several known formats. As an example 10:45 Today is Monday 11:13 The weather is nice 12:00 The weather is cloudy I can match each of them via The weather is %{WORD:weather} Today is…
WoJ
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_grokparsefailure on successful match

I started using logstash to manage syslog. In order to test it I am sending from a remote machine simple messges and try to parse them with logstash. The only Logstash configuration, used via the command line: input { syslog { …
WoJ
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Use Logstash with HTML log

I'm new to Logstash, trying to use it to parse a HTML log file. I need to output only the log lines, i.e. ignore preceding JS, CSS and HTML that are also included in the file. A log line in the file looks like this: Jan…
burgi
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Logstash monitoring tools

We setup the environment for logstash & elastic search for log analysis.My hardware environment is high end even though the performance of the logstash is slow.Now Our goal is to find the following area where it takes much time input,filter or…
Devaraj
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Getting logstash log parse error: grokparsefailure

I try to integrate logstash in our application where I include following piece of pattern in custompattern file. Path: /custom_pattern -- This is custom pattern file. I include this path in conf. Content: ACCESSLOGPARSE…
svjn
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Does logstash support If-Then-Else Conditionals in Regular Expressions?

I tried to use follow regex: (a)?b(?(1)c|d). It is example from http://www.regular-expressions.info/conditional.html. But I got error. /opt/logstash-1.4.2/bin/logstash -e 'input { stdin { } } filter { grok { match => [ "message", "(a)?b(?(1)c|d)" ]…
fervid
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Logstash Indexing

I would like to create two separate indexes for two different systems that are sending data to the logstash server setup for udp - syslog. In Elasticsearch, I created an Index called CiscoASA01 and another Index called CiscoASA02. How can I…
gmatteson
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Does File input support for compressed files in logstash

I'm trying to read files from compressed format files to parse it as input. Here are the file formats gzip, zip,tar.gz I referred the two links but haven't get much…
Devaraj
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