Logstash Custom match patterns - logstash

We are in the process of capturing the logstash
2016-01-07 13:12:36,718 82745269 [http-nio-10180-exec-609] 8ca2b394-f435-4376-9a16-8be44ad437b9 - entry:"dummy-AS-1.1"
we are having logs like this,We want how to match the messages .Once matched we want to remove 82745269 and [http-nio-10180-exec-609].Pls help

How do you match them? With the grok filter.
How do you make a grok pattern? Slowly, using the debugger.
Maybe an introduction would help.

Related

Aplly GROK to a log file

I have thease following logs:
{"type":"audit_entry","created":"5/20/2021, 11:12:42 PM","colaborador_id":"cf7dc62b-dde9-4980-89d8-96eb5707876e","ip":"192.168.112.6","request_method":"PUT","ajax":false,"route":"/stock/artigos/8c443bfe-d077-46d2-805b-948c15534f2c","protocol":"https"}
{"type":"audit_javascript","created":"5/20/2021, 11:12:42 PM","colaborador_id":"cf7dc62b-dde9-4980-89d8-96eb5707876e","origin":"/stock/artigos/8c443bfe-d077-46d2-805b-948c15534f2c","message":"SUCCESS"}
{"type":"audit_entry","created":"5/20/2021, 11:17:30 PM","colaborador_id":"cf7dc62b-dde9-4980-89d8-96eb5707876e","ip":"192.168.112.6","request_method":"PUT","ajax":false,"route":"/stock/artigos/e7fd6fb0-668a-4285-a78e-1c3e2f8ebba4","protocol":"https"}
{"type":"audit_javascript","created":"5/20/2021, 11:17:30 PM","colaborador_id":"cf7dc62b-dde9-4980-89d8-96eb5707876e","origin":"/stock/artigos/e7fd6fb0-668a-4285-a78e-1c3e2f8ebba4","message":"SUCCESS"}
{"type":"audit_entry","created":"5/21/2021, 8:31:00 AM","colaborador_id":"9b3b665d-5c95-4a4b-9ace-a140b1ea9259","ip":"192.168.112.6","request_method":"PUT","ajax":false,"route":"/relacionamento/agendamento/c3058ae8-3c55-45ac-b184-72470b3e1299","protocol":"https"}
How I can use GROK in this case?
It seems like it's not possible to apply grok to this

getting rid of colon in grok

Basically I was setting up an Elasticsearch-Logstash-Kibana (elk) stack for monitoring syslogs. Now I have to write the grok pattern for logstash.
Here's an example of my log:
May 8 15:14:50 tileserver systemd[25780]: Startup finished in 29ms.
And that's my pattern (yet):
%{SYSLOGTIMESTAMP:zeit} %{HOSTNAME:host} %{SYSLOGPROG:program}
Usually I'm also using %{DATA:text} for the message but it just works on the link below.
I'm using Test grok patterns to test my patterns and these 3 work fine but there's the colon (from after PID) in front of the message and I don't want it to be there.
How do I get rid of it?
try this:
%{SYSLOGTIMESTAMP:zeit} %{HOSTNAME:host} %{GREEDYDATA:syslog_process}(:) %{GREEDYDATA:message}

Logstash grok pattern for [2017-08-19T12:47:43,822][INFO][logstash.agent] Successfully started Logstash API endpoint {:port=>9600}

Can anyone give the logstash grok pattern for below lines. I want to take only timestamp alone.
[2017-08-19T12:47:43,822][INFO][logstash.agent] Successfully started Logstash API endpoint {:port=>9600}
[2017-08-19T12:49:47,213][WARN][logstash.agent] stopping pipeline {:id=>"main"}
I'm not sure to understand what you want but here are two possible solutions:
[%{GREEDYDATA:date1}][%{LOGLEVEL:debugLevel}][%{USERNAME:agentName}] %{GREEDYDATA:message} [%{TIMESTAMP_ISO8601:date2}][%{LOGLEVEL:debugLevel2}][%{USERNAME:agentName2}] %{GREEDYDATA:message}
This grok pattern will extract all information that you have in your log, then you decide if you want to use date1 or date2 field
%{GREEDYDATA:trash}[%{TIMESTAMP_ISO8601:date}]%{GREEDYDATA:trash}
This one will only return the second date of your log
Hope it helped !
If you only need the timestamp, this should do:
\[%{TIMESTAMP_ISO8601:date}\]
Results for your two loglines on https://grokconstructor.appspot.com:
If you want to match the whole pattern something like this may fit your needs:
\[%{TIMESTAMP_ISO8601:date}\]\[%{LOGLEVEL:loglevel}\]\[%{GREEDYDATA:agent}\] %{GREEDYDATA:message}
Results:

logstash filter , unfiltered lines

I am new to Logstash filter and going through different blogs and links to understand in detail. I have few questions which are still unanswered.
. If my log file has different log pattern e.g.
2017-01-30 14:30:58 INFO ThreadName:33 - {"t":1485786658088,"h":"abcd1234", "l":"INFO", "cN":"org.logstash.demo", "mN":"getNextvalue", "m":"fetching next value"}
2017-01-30 14:30:58 INFO AnotherThread:33 -my log pattern is different
I have below filter which is successfully filtering line 1 of the log
grok
{
match => [ "message", "%{TIMESTAMP_ISO8601:LogDate} %{LOGLEVEL:loglevel} %{WORD:threadName}:%{NUMBER:ThreadID} - %{GREEDYDATA:Line}" ]
}
json
{
source => "Line"
}
what will happen with the lines which can not be filtered using filter pattern?
Is there any way to capture all the lines which were not filtered and send to elasticSearch ?
Is there any good reading material where I can read about Input, Filter, Output plugins with the examples ?
To answer your questions:
The lines which cannot be filtered using grok would end up in a
grok_parsefailure. Make sure you handle it by dropping the lines
which don't actually match the filter criteria.
As far as I know you can't capture them separately and push it to ES. Maybe for this, you can have multiple grok patterns so that you can filter it out and send it to different ES indices thereafter.
I've added the links in the comment above.
This SO could come in handy. Hope it helps!
As #darth_vader points out, you'll get a "grok_parsefailure" tag on each document that doesn't match your pattern(s) in a grok{} filter. However, how you handle this failure is up to you.
By default, all the events will fall through to your output{} section, which presumably would send them to elasticsearch. You could also have a conditional output{} section, which sent parsed logs to one output and unparsed logs to another (a file{} output, or a different index, or...).
As for examples, the official doc tends to include incomplete fragments (at best), so you're probably going to find better examples in random internet blogs.

Parsing postfix events with grok

I'm trying to figure out how it works logstash and grok to parse messages. I have found that example ftp://ftp.linux-magazine.com/pub/listings/magazine/185/ELKstack/configfiles/etc_logstash/conf.d/5003-postfix-filter.conf
which start like this:
filter {
# grok log lines by program name (listed alpabetically)
if [program] =~ /^postfix.*\/anvil$/ {
grok{...
But don't understand where [program] is parsed. I'm using logstash 2.2
That example are not working in my logstash installation, nothing is parsed.
I answer myself.
The example assumes that the events come from syslog (in that case the field "program" are present), instead filebeats which is what I'm using to send the events to logstash.
To fix-it:
https://github.com/whyscream/postfix-grok-patterns/blob/master/ALTERNATIVE-INPUTS.md

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