Grok filter is not working (custom pattern)

Elastic Stack Logstash
1

I've a log file (http://codepad.org/vAMFhhR2), and I want to extract a specific number out of it (line 18)
I wrote a custom pattern grok filter, tested it on http://grokdebug.herokuapp.com/, it works fine and extracts my desired value.

here's how logstash.conf looks like (http://codepad.org/FxY8ZXUa)
but it doesn't match any record from the same log on Kibana

can you help?

1 Like
2

What is the query you are using when running in Kibana?

3

I don't run any queries on kibana @jkuang.

4

Have you checked by making the logstash to stdout insted of elasticsearch? Can you paste the output here?

input {
	tcp {
		port => 5000
	}
}

## Add your filters / logstash plugins configuration here
filter {
	grok{
		 match => [ "message", "(?<scraped>(?<='item_scraped_count': ).*(?=,))" ]
	}
}

output {
	stdout {
		codec => rubydebug
	}
}
5 
{
logstash_1       |     "@timestamp" => 2017-04-12T11:22:38.841Z,
logstash_1       |           "port" => 39100,
logstash_1       |       "@version" => "1",
logstash_1       |           "host" => "172.18.0.1",
logstash_1       |        "message" => "2017-01-01 07:57:22 [statscollectors.py] INFO: Dumping Scrapy stats:",
logstash_1       |           "tags" => [
logstash_1       |         [0] "_grokparsefailure"
logstash_1       |     ]
logstash_1       | }

here's a part of the output, its the same for every line in the log, I guess there's a problem in my regex.

6

In Logstash the grok must match all fields and then you can extract the particular you want. The grokdebug you provided just ignores other fields besides the one you specified.

7

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.