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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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How to handle non-matching Logstash grok filters

I am wondering what the best approach to take with my Logstash Grok filters. I have some filters that are for specific log entries, and won't apply to all entries. The ones that don't apply always generate _grokparsefailure tags. For example, I…
Spanky
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Change default mapping of string to "not analyzed" in Elasticsearch

In my system, the insertion of data is always done through csv files via logstash. I never pre-define the mapping. But whenever I input a string it is always taken to be analyzed, as a result an entry like hello I am Sinha is split into…
Sagnik Sinha
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Logstash optional fields in logfile

I'm trying to parse a logfile using grok Each line of the logfile has fields separated by commas: 13,home,ABC,Get,,Private, Public,1.2.3 ecc... I'm using match like this: match => [ "message",…
alpa
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How do I match a newline in grok/logstash?

I have a remote machine that combines multiline events and sends them across the lumberjack protocol. What comes in is something that looks like this: { "message" => "2014-10-20T20:52:56.133+0000 host 2014-10-20 15:52:56,036 [ERROR …
Wayne Werner
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How to process multiline log entry with logstash filter?

Background: I have a custom generated log file that has the following pattern : [2014-03-02 17:34:20] - 127.0.0.1|ERROR| E:\xampp\htdocs\test.php|123|subject|The error message goes here ; array ( 'create' => array ( 'key1' => 'value1', …
emonik
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List of SYNTAX for logstash's grok

The syntax for a grok pattern is %{SYNTAX:SEMANTIC}. How do i generate a list of all available SYNTAX keywords ? I know that I can use the grok debugger to discover patterns from text. But is there a list which i can scan through?
Cola
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Logstash - remove deep field from json file

I have JSON file that I'm sending to ES through logstash. I would like to remove 1 field ( It's deep field ) in the JSON - ONLY if the value is NULL. Part of the JSON is: "input": { "startDate": "2015-05-27", "numberOfGuests": 1, …
Amit Daniel
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have a grok filter create nested fields as a result

I have a drupal watchdog syslog file that I want to parse into essentially two nested fields, the syslog part and the message part so that I get this result syslogpart: { timestamp: "", host: "", ... }, messagepart:{ parsedfield1: "", …
Killerpixler
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logstash _grokparsefailure issues

I'm having issues with grok parsing. In ElasticSearch/Kibana the lines I match come up with the tag _grokparsefailure. Here is my logstash config : input { file { type => logfile path => ["/var/log/mylog.log"] } } filter {…
lepolac
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Parse Apache2 Error logs with Grok for Logstash

Im trying to parse my apache2 error log and im having a bit of trouble.. It doesnt seem to be matching the filter. Im pretty sure the timestamp piece is wrong, but im not sure, and i cant really find any documentation to figure it out. Also, is…
Ascherer
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Logstash config, "if string contains..."

So, let's assume that I have a portion of a log line that looks something like this: GET /restAPI/callMethod1/8675309 The GET matches a http method, and get's extracted, the remainder matches a URI, and also gets extracted. Now in the logstash…
A_Elric
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Logstash close file descriptors?

BACKGROUND: We have rsyslog creating log files directories like: /var/log/rsyslog/SERVER-NAME/LOG-DATE/LOG-FILE-NAME So multiple servers are spilling out their logs of different dates to a central location. Now to read these logs and store them in…
Siddharth Trikha
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How to parse json in logstash /grok from a text file line?

I have a logfile which looks like this ( simplified) Logline sample MyLine data={"firstname":"bob","lastname":"the builder"} I'd like to extract the json contained in data and create two fields, one for firstname, one for last. However, the ouput i…
bingbon
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Default grok patterns path

I have installed Logstash on Ubuntu Server 14. Where can I find the default grok patterns that Logstash uses when filtering logs ? Thanks.
Aymen Chetoui
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Adding fields depending on event message in Logstash not working

I have ELK installed and working in my machine, but now I want to do a more complex filtering and field adding depending on event messages. Specifically, I want to set "id_error" and "descripcio" depending on the message pattern. I have been trying…
Natsen
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