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
Related
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}
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?
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.
I have been following this guide:
http://deviantony.wordpress.com/2014/06/04/logstash-debug-configuration/
Which I'm hoping will help me test my logstash filters to see if I get the desired output before using them full time.
As part of the guide it tells you to set up an input and output and then a filter file. the input seems to work fine:
input {
stdin { }
}
The output is this:
output {
stdout {
codec => json
}
file {
codec => json
path => /tmp/debug-filters.json
}
}
I am getting the following error when I try to run the logstash process (here I've run it with --configtest as the error advises me to try that, but it doesn't give any more information):
# /opt/logstash/bin/logstash -f /etc/logstash/debug.d -l /var/log/logstash/logstash-debug.log --configtest
Sending logstash logs to /var/log/logstash/logstash-debug.log.
Error: Expected one of #, ", ', -, [, { at line 21, column 17 (byte 288) after output {
stdout {
codec => json
}
file {
codec => json
path =>
I have tried removing the file section in my output and I can get the logstash process running, but when I paste my log line in to the shell I don't see the log entry broken down in to the components I am expecting the grok filter to break it in to. All I get when I do that is:
Oct 30 08:57:01 VERBOSE[1447] logger.c: == Manager 'sendcron' logged off from 127.0.0.1
{"message":"Oct 30 08:57:01 VERBOSE[1447] logger.c: == Manager 'sendcron' logged off from 127.0.0.1","#version":"1","#timestamp":"2014-10-31T16:09:35.205Z","host":"lumberjack.domain.com"}
Initially I was having a problem with a new grok filter, so I have now tried with an existing filter that I know works (as shown above it is an Asterisk 1.2 filter) and has been generating entries in to elasticsearch for some time.
I have tried touching the json file mentioned in the output, but that hasn't helped.
When I tail the logstash-debug.log now I just see the error that is also being written to my shell.
Any suggestions on debugging grok filters would be appreciated, if I have missed something blindingly obvious, apologies, I've only been working with ELK & grok for a couple of weeks and I might not be doing this in the most sensible way. I was hoping to be able to drop example log entries in to the shell and get the JSON formatted logstash entry to my console so I could see if my filter was working as I hoped, and tagging them up as they will be displayed in kibana at the end. If there is a better way to do this please let me know.
I am using logstash 1.4.2
As far as debugging a grok filter goes, you can use this link (http://grokdebug.herokuapp.com/) It has a very comprehensive pattern detector which is a good start.
As far your file output, you need "" around your path. Here is the example i use in production. Here is the documentation on file output http://logstash.net/docs/1.4.2/outputs/file#path
output {
stdout {
codec => rubydebug
}
file {
codec => "plain"
path => "./logs/logs-%{+YYYY-MM-dd}.txt"
}
}
The Grokconstructor is a similar Grok debugger to Grokdebug which #user3195649 mentioned. I like it's random examples.
I am using the grok pattern to extract some data from file path, but it does not seem to work right
path: /home/shard/logstash/test/12/23/abc_132.log
pattern: %{GREEDYDATA}/%{INT:group}/%{INT:id}/%{DATA:job_type}(_%{UUID:uuid})*\.log
I want to extract 132 as the uuid field and it works ok when tested in grok debugger [http://grokdebug.herokuapp.com/] but when applied in logstash indexer, it fetches all of abc_132 under job_type field.
What may be the issue here and how can I extract uuid (perhaps a different regex?).
You can try to get the uuid from the job_type by using the ruby filter
ruby {
code => "event['uuid'] = event['job_type'].split('_')[1]"
}
Hope this can help you.