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
%{SPACE} is that pattern that matches 0 or more spaces, which is very useful if you don't know (or care!) if there will be a space or not.
Related
I have following grok pattern
%{SYSLOGTIMESTAMP:timestamp} %{SYSLOGHOST:hostname} %{LOGLEVEL:logLevel} %{SYSLOGPROG}: %{DATA:message_code:} %{GREEDYDATA:syslog_message}
Here is my message
"messages": "{"data":"<133>May 7 10:58:21 aa.bb.cc notice root[27119]: updatecheck[32172]: messagebody"}"
The question is for the "message_code" part, how can modify my grok pattern so it only parse "updatecheck" but ignore [32172]
You can use he below grok pattern where I have taken the [32172] in different field.
%{SYSLOGTIMESTAMP:timestamp} %{SYSLOGHOST:hostname} %{LOGLEVEL:logLevel} %{SYSLOGPROG}: %{DATA:message_code}\[%{POSINT:random_number}\]: %{GREEDYDATA:syslog_message}\"}
Output
Now, you can ignore or drop the field random_number depending on your use case.
I have a log pattern where every log element is enclosed in square brackets. I can't control the original log. I just want the grok parsing to ignore the brackets and only interpret what's between them. Based on something close to the following line:
2019-04-04 13.23.57.057 [52] [77] [MEASURE] [XYZService]
, I want the pattern to see the 52 as a threadId. I have the following code:
if [message] =~ "MEASURE" {
grok {
match => { " message" => "%{TIMESTAMP_ISO8601:logtime} [%{NUMBER:threadId}] %{GREEDYDATA:restofmessage}" }
}
}
else {
drop()
}
In this state, I get a grokparsefailure when logstash attempts to interpret the line. I am certain its only related to the bracketed portion, because when I remove that pattern, every works fine. I would be grateful for any ideas what I am doing wrong. Thanks
nevermind. I got it to work by escaping the brackets like this: \ [ %{NUMBER:threadId}
\ ]
Been banging my head against the wall over this - started out with logstash and Grok 2 days ago and made a bit of progress but i've been stuck looking at this particular problem all evening.
I have the following lines of input from a log file being ingested into logstash.
'John Pence ':'decrease':-0.01:-1.03093: 0.96: 0.97
'Dave Pound':'increase':0.04:1.04000: 0.97: 0.93
With the following grok filter matches:
match => { "message" => "%{QS:name}:%{QS:activity}:%{BASE16FLOAT:Change}:%{BASE16FLOAT:Percentage}: %{BASE16FLOAT:CurrentPrice}: %{BASE16FLOAT:PreviousPrice}" }
match => { "message" => "%{QS:Name}:%{QS:Activity}:-%{BASE16FLOAT:Change}:-%{BASE16FLOAT:Percentage}: %{BASE16FLOAT:CurrentPrice}: %{BASE16FLOAT:PreviousPrice}" }
This produces the following output in Kibana:
As you can see - I can't get the negative numbers to display correctly, how would one correctly show the minus sign in a grok filter?
Would greatly appreciate some help!
You can simply use the NUMBER grok pattern instead of BASE16FLOAT
The following grok pattern works perfectly on your input:
grok {
"match" => {"message" => "%{QS:name}:%{QS:activity}:%{NUMBER:Change}:%{NUMBER:Percentage}: %{NUMBER:CurrentPrice}: %{NUMBER:PreviousPrice}"}
}
Ive recently began learning logstash and the syntax is confusing me.
eg : for match i have various codes:
match => [ "%{[date]}" , "YYYY-MM-dd HH:mm:ss" ]
match => { "message" => "%{COMBINEDAPACHELOG}" }
match => [ "timestamp" , "dd/MMM/yyyy:HH:mm:ss Z" ]
What does each of these keys ("%{[date]}", "message", "timestamp") mean. And where can i find a proper documentation that explains all the keywords and syntax.
Please help and provide links if possible.
The grok{} filter has a match parameter that takes a field and a pattern. It will apply the pattern, trying to extract new fields from it. Your second example is from grok, so it will try to apply the COMBINEDAPACHELOG pattern against the text in the "message" field.
The doc for grok{} is here, and there are detailed blogs, too.
The other two examples look like they're from the date{} filter, which does a similar thing. It takes a field containing a string that represents a date, applies the given pattern to that field, and (by default) replaces the value in the #timestamp field.
The doc for date{} is here and examples here.
My log file contains different structures in a few lines, and I can not grok it, I don't know if we can test by lines or attribute, I'm still a beginner.
if you don't understand me I can give you some examples :
input :
id=firewall action=bloc type=web
id=firewall fw="ER" type=filter
id=firewall fw="Az" tz="loo" action=bloc
Pattern:
id=%{WORD:id} ...
I thought to add some patterns between ()?,
but i don't know exactly how to do it.
you can use this site to test it http://grokdebug.herokuapp.com/
Any help please? What should i do :(
Logstash supports key-value Values, take a look at http://logstash.net/docs/1.4.2/filters/kv.
Or you could use multiple match values:
grok {
patterns_dir => "./patterns"
match => [
"message", "%{BASE_PATTERN} %{EXTRA_PATTERN}",
"message", "%{BASE_PATTERN}",
"message", "%{SOME_OTHER_PATTERN}"
]
}
Not sure if I understood well your question but I will try to answer. I think the first thing you have to do is to parse the different fields from your input. Example of pattern to parse your first line input :
PATTERN %{NOTSPACE} %{NOTSPACE} %{NOTSPACE} (in $LOGSTASH_HOME/pattern/extra)
Then in your logstash configuration file :
filter {
grok {
patterns_dir => "$LOGSTASH_HOME/pattern"
match => [ "message" => "%{PATTERN}" ]
}
}
This will match your first line as 3 fields ("id=firewall" "action=bloc" "type=web") (you have to adapt it if you have more than 3 fields).
And the last thing you seem be looking for is splitting field (in key-value scheme) like id=firewall would become id => "firewall". This can be done with the kv plugin. I never used it but I recommend you the logstash docs here
If I did not understand you question, please be more clear.