I'm trying to take the search word out of the slow logs. It is required to keep this extracted term in a different field so that I can visualize it via Kibana.
For example:
The search slow log on which I am testing the grok pattern is :
{\"query\":{\"bool\":{\"should\":[{\"match\":{\"sentences.0\":{\"query\":\"Professional\"}}}],\"boost\":1.0}},\"_source\":false,\"fields\":[{\"field\":\"url\"}],\"highlight\":{\"fields\":{\"sentences.0\":{}}}}
Since "Professional" is the search term in this case, I want to keep it in a separate field.
I tried to use this below grok pattern
grok {
match => { "message" => 'queryterm=(?<query>[a-z])' }
}
But the above grok pattern is not working.
Can anyone please help me out with this?
Related
I'm trying to use a lookbehind and a lookahead in a Grok custom pattern and getting pattern match errors in the Grok debugger that I cannot resolve.
This is for archiving system logs. I am currently trying to parse the postgrey application.
Given data such as:
2019-04-09T11:41:31-05:00 67.157.192.7 postgrey: action=pass, reason=triplet found, delay=388, client_name=unknown, client_address=103.255.78.9, sender=members#domain.com, recipient=person#domain.com
I'm trying to use the following to pull the string between "action=" and the comma immediately following it as the field "postgrey_action":
%{TIMESTAMP_ISO8601:timestamp} (?:%{SYSLOGFACILITY} )?%{SYSLOGHOST:logsource} %{SYSLOGPROG} (?<postgrey_action>(?<=action=).+?(?=\,))
I expect to see the following output:
{
"program": "dhcpd:",
"logsource": "66.146.192.67",
"timestamp": "2019-04-09T11:41:31-05:00"
"postgrey_action": "pass"
}
Instead, from the debugger, I receive "Provided Grok patterns do not match data in the input".
How can I properly make this lookbehind/lookahead work?
Edit: I should note that without the postgrey_action match at the end of the Grok pattern, the Grok Debugger runs and works as expected (using linux-syslog and grok-patterns).
Logstash version 6.3.2
As a work around, I have resorted to modifying my syntax, using a custom patterns file, and referencing it in each filter using the patterns_dir directive.
Ex.
My pattern:
POSTGREY %{TIMESTAMP_ISO8601:timestamp} (?:%{SYSLOGFACILITY} )?%{SYSLOGHOST:logsource} %{SYSLOGPROG} (action=)%{WORD:postgrey_action}(,) (reason=)%{DATA:postgrey_reason}(,) (delay=)%{NUMBER:postgrey_delay}(,) (client_name=)%{IPORHOST}(,) (client_address=)%{IPORHOST:postgrey_clientaddr}(,) (sender=)%{EMAILADDRESS:postgrey_sender}(,)
My filter:
if "postgrey" in [program] {
grok {
match => { "message" => "%{POSTGREY}"}
patterns_dir => ["/etc/logstash/patterns"]
overwrite => [ "message" ]
}
}
However, this workaround still does not answer my original question, which is, why did my initial approach not work?
Looking at the Oniguruma Regex documentation and the Grok filters documentation, it's not clear to me what is wrong with my original syntax or how a look-ahead/look-behind should be properly implemented with grok regex named capture. If it is not supported, it should not be documented as such.
I'm new at ELK-stack and want to add a field in kibana(discover) interface that matches a specific part of the message text (one word or a sentence).
for example:
I want to have a field in the left side that matches the word 'installed' in the message text.
Which filter in logstash should I use and how does it look like?
How about grok{}, which applies a regular expression to your input message and can make new fields?
Thanks for the answer. I used grok as following to match how many users created new accounts.
grok {
match => [ "message", "(?<user_created>(user_created))"]
break_on_match => false
}
Anyway I found out the problem is that Kibana is showing old logs and doesn't care what I do in the logstash config file! still can't find out why!
hello I am newer to the logstash. when I am trying to parse the #message field in logstash, that is output from nxlog. can anyone please suggest me how to use regex in grok to parse the below #message field.
"The audit log was cleared.\r\nSubject:\r\n\tSecurity
ID:\tS-1-5-21-1753799626-3523340796-3104826135-1001\r\n\tAccount
Name:\tJhon\r\n\tDomain Name:\tJactrix\r\n\tLogon ID:\t1x12325"
and I am using following grok pattern to parse
match => { "%{#message}" =>
"%{GREEDYDATA:msg}\r\nSubject:%{DATA}\r\n\tSecurity
ID:\t%{USERNAME}\r\n\tAccount Name:%{GREEDYDATA}\r\n\tDomain
Name:\t%{GREEDYDATA}\r\n\tLogon ID:\t%{GREEDYDATA}" }
Thank you
as a starter you could try the following pattern:
%{GREEDYDATA:msg}.*Subject:%{GREEDYDATA:subject}.*Security ID:%{GREEDYDATA:securityId}.*Account Name:%{GREEDYDATA:accountName}Domain Name:%{GREEDYDATA:domainName}Logon ID:%{GREEDYDATA:logonID}
Then try to refine the patterns depending on the structure of your log-files (e.g. accountName might be %{WORD} or ....). You can use http://grokdebug.herokuapp.com/ to test your pattern. A list of predefined patterns is found here: https://github.com/logstash-plugins/logstash-patterns-core/tree/master/patterns
I have many messages like this:
Error GetMilesFromLocationService(Eastvale, CA,Yorkshire, NY,1561517,19406,True.)
The problem is that they are unique because of the city names. In a Kibana Visualization, is it possible group these into "Error GetMilesFromLocationService" messages? Here's an example of my metrics visual. Ideally, they would all be in one row.
These could be easily grouped by a regex match.
Of course, I could add a new field with Logstash, but if Kibana is able to do this, I'll be happy.
Thanks!
Use a grok filter to parse the message and extract fields from it. At the very least you'll want to extract "Error GetMilesFromLocationService" into a separate field (perhaps error_type?) to allow aggregation. Or perhaps it would be better to extract "GetMilesFromLocationService" into a function field? Without knowing the structure of your log messages giving firm advice is hard.
This grok filter extracts an error_type field:
filter {
grok {
match => [
"message",
"^(?<error_type>Error %{WORD})"
]
}
}
I'm trying to parse my application's logs with logstash (version 1.4.2) and grok, but for some reason I don't understand, grok fails to parse some of the lines that should match the specified filter. I've searched Google and Stackoverflow, but most of the problems other people had seemed to be related to multiline log messages (which isn't the case for me), and I couldn't find anything that solved my problem.
My filter looks like this:
filter {
grok {
match => { "message" => "%{SYSLOGBASE} -(?<script>\w*)-: Adding item with ID %{WORD:item_id} to database."}
add_tag => ["insert_item"]
}
}
Here's the message field of a line that is parsed correctly:
May 11 16:47:55 myhost rqworker: -script-: Adding item with ID 982663745238221172_227691295 to database.
And here's the message field of a line that isn't:
May 11 16:47:55 myhost rqworker: -script-: Adding item with ID 982663772746479443_1639853260 to database.
The only thing that differs between these messages is the item's ID, and Grok Debugger parses them both correctly.
I've checked the logstash log file, but didn't see any relevant error messages.
I'm just starting out with logstash and have no idea what is happening here; any help would be much appreciated!