Grabbing multiple lines using Grok - logstash

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

Related

How to grok first line from an XML format. (Logstash)

I am quite new to the magic world of Grok. Any help will be thankful.
I need to apply filter for the following file.
The file contains logs
The grok pattern i am trying to use
(?m)(?<Rabbit_datetimeTMP>.{23}) %{LOGLEVEL:Level}.messageid:\s%{BASE10NUM:Id}
<%{GREEDYDATA:Data}>
I need to grok the datetime logelevel message id and the first line of xml(</Xml-fragment xmlns: sol ="http://www.rabitmq.com/was/xml/complte" xmlns:ns2="http://www.rabitmq.com/was/xml/complte">) . starts with< and ends with >.
unfortunately its taking the entire xml format.output

How to add a tag when messages is multiline in Logstash

I use Filebeat6x to ship my logs to logstash.
Some of my logs may be a multiline thats why I use Filebeat to Manage multiline messages
Now I want to add filter in logstash to do something like
if the message is multiline then add tag.
If the parsing of those multilines was from logstash I will use multliline_tag.
But how can I tag those multilines when the parsing is done in filebeat?

Filebeat not sending correct multiline log to logstash

For some reason filebeat is not sending the correct logs while using the multiline filter in the filebeat.yml file. The log file im reading has some multiline logs, and some single lines. However, they all follow the same format by starting with a date. For an example, here is a couple lines:
2017-Aug-23 10:33:43: OutputFile: This is a sample message
2017-Aug-23 10:34:23: MainClass: Starting connection:
http.InputProcess: 0
http.OutPutProcess: 1
2017-Aug-23 10:35:21: OutputFile: This is a sample message 2
My Filebeat yml is:
- input_type: log
paths:
- /home/user/logfile.log
document_type: chatapp
multiline:
pattern: "^%{YYYY-MMM-dd HH:mm:ss}"
negate: true
match: before
For some reason when i see the filebeat logs hit elasticsearch, all of the logs will be aggragated into one log line, so it does not seem to be actually reading the file date by date. Can Anyone help? Thanks!
Use
pattern: "^%{YEAR}-%{MONTH}-%{MONTHDAY}"
The pattern you are currently using there is not a validly defined regex given the grok patterns.
You can test multiline patterns using the grokconstructor. I constructed this pattern from the grok-patterns predefined in logstash.

default variable values for logstash

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.

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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