default variable values for logstash - logstash-grok

Is there a document on what are the default values for variables in logstash?
like:
break_on_match => true
named_captures_only => true
Similarly what is the default codec and other default values.
Received an event that has a different character encoding than you configured. {:text=>"Sc=\x80\u0013 (from the logs it is Sc=€) expected_charset=>"UTF-8", :level=>:warn}
How to overcome this error?

Grok filter in logstash has a documentation which can be easily found if you search for 'grok logstash document'. The exact link to a summary of all the fields and their default value is as below:
https://www.elastic.co/guide/en/logstash/current/plugins-filters-grok.html#_synopsis_125
Basically Grok is a Filter plugin and Codec is altogether a set of plugins which can be used in Input and Output Configuration. I would suggest you to read basic information about Logstash Configuration Structure and plugins. You can find relevant information here: https://www.elastic.co/guide/en/logstash/current/configuration-file-structure.html
Codec includes a number of different plugins and all of them have a dedicated document page. Each Input and Output plugin will have a default codec value, however, this value depends on which Input/Output plugin it is. In your question you have not mentioned which Plugin's default codec value you need.

Related

Grabbing multiple lines using Grok

The following is a log sample I need to parse using logstash and the logstash grok filter:
2018-02-12 15:17:39.216 [DEBUG] [ 60] [CashTransactionReportCommand] [4564 456] - Xml of valid cash: <NewDataSet>
<Table>
<transaction_id>546464</transaction_id>
<device_trans_id>24</device_trans_id>
<value>3.5000</value>
<product_code>40</product_code>
<product_pa_code>E1</product_pa_code>
<catalog_number />
<decimal_place>2</decimal_place>
<site_id>2</site_id>
<machineSeTime>2018-02-12T17:17:39.273+00:00</machineSeTime>
<payment_method_id>3</payment_method_id>
<actor_id>4566</actor_id>
<operator_id>55</operator_id>
</Table>
</NewDataSet>
I almost have everything I need:
%{TIMESTAMP_ISO8601:log_timestamp} \[%{LOGLEVEL:loglevel}\] \[%{DATA:snId}\] \[%{WORD:snName}\] (?<test>\[\d+ \d+\]) %{GREEDYDATA:logmessage}
My only problem with the "logmessage". I need it to contain everything passed "[4564 456]" until the end of the example.
In order to be able to parse the message, including the XML, you'll have to group all the lines in the same logstash event, so that when using the grok filter, the message field contains the whole message. This can be done:
in logstash with the multiline codec
Multiline in logstash
Multiline codec documentation
in filebeat with the multiline option
Multiline in filebeat
Documentation of multiline option in filebeat configuration

Is It necessary to restart logstash after modifying a dictionary_path file?

I used the following translate filter in logstash
translate {
field => "countries"
destination => "cities"
dictionary_path => "/home/rrr/cities.yml"
}
And I started logstash this way
/usr/share/logstash/bin/logstash -f $directory --path.settings=/etc/logstash -t
Everything went well and good.
My question is :
Would logstash will take into account any modification that I may do in the dictionary_path file ?
I means do I need to restart logstash after any edition on this file or not ?
It should not be necessary to restart logstash. There is a parameter in the configuration of the translate plugin, refresh interval:
refresh_interval
Value type is number
Default value is 300
When using a dictionary file, this setting will indicate how frequently (in seconds) logstash will check the dictionary file for updates.

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

Logstash to output events in Elasticsearch bulk API data format

Is is possible to have Logstash to output events in Elasticsearch bulk API data format?
The idea is to do some heavy parsing on many machines (without direct connectivity to the ES node) and then feed the data manually into ES.
Thank for the help.
Maybe if you need change the flush_size in Logstash with your value:
https://www.elastic.co/guide/en/logstash/current/plugins-outputs-elasticsearch.html#plugins-outputs-elasticsearch-flush_size
Or send metadata in file using json codec and afterload directly on elasticsearch
https://www.elastic.co/guide/en/logstash/current/plugins-outputs-file.html
Logstash is a single-line type of system, and the bulk format is a multi-line format. Here are two ideas:
1) see if the file{} output message_format can contain a newline. This would allow you to output the meta data line and then the data line.
2) use logstash's clone{} to make a copy of each event. In the "original" event, use the file{} output with a message_format that looks like the first line of the bulk output (index, type, id). In the cloned copy, the default file{} output might work (or use the message_format with the exact format you need).

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