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dutzu 2016-02-04 12:34:46 +02:00
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15
_posts/2016-01-11-log-aggregation.md
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@ -73,16 +73,17 @@ This is a pain because if you want to properly visualize a set of log messages g
Let's take a look at what fluentd sends to Elasticsearch. Here is a sample log file with 2 log messages:
~~~java
~~~
2015-11-12 06:34:01,471 [ ajp-apr-127.0.0.1-8009-exec-3] LogInterceptor INFO ==== Request ===
2015-11-12 06:34:01,473 [ ajp-apr-127.0.0.1-8009-exec-3] LogInterceptor INFO GET /monitor/broker/ HTTP/1.1
~~~
{: .language-java}
A message sent to Elasticsearch from fluentd would contain these values:
*-this isn't the exact message, this is the result of the stdout output plugin-*
~~~
~~~ java
2015-11-12 06:34:01 -0800 tag.common: {"message":"[ ajp-apr-127.0.0.1-8009-exec-3] LogInterceptor INFO ==== Request ===","time_as_string":"2015-11-12 06:34:01 -0800"}
2015-11-12 06:34:01 -0800 tag.common: {"message":"[ ajp-apr-127.0.0.1-8009-exec-3] LogInterceptor INFO GET /monitor/broker/ HTTP/1.1\n","time_as_string":"2015-11-12 06:34:01 -0800"}
@ -98,7 +99,7 @@ In order to build it yourself you only need the `record_transformer` filter that
Next you need to parse the timestamp of your logs into separate date, time and millisecond components (which is basically what the better-timestamp plugin asks you to do, to some extent), and then to create a filter that would match all the messages you will send to Elasticsearch and to create the `@timestamp` value by appending the 3 components. This makes use of the fact that fluentd also allows you to run ruby code within your record_transformer filters to accommodate for more special log manipulation tasks.
~~~
~~~xml
<filter tag.**>
type record_transformer
enable_ruby true
@ -111,7 +112,7 @@ Next you need to parse the timestamp of your logs into separate date, time and m
The result is that the above sample will come out like this:
~~~
~~~java
2015-12-12 05:26:15 -0800 akai.common: {"date_string":"2015-11-12","time_string":"06:34:01","msec":"471","message":"[ ajp-apr-127.0.0.1-8009-exec-3] LogInterceptor INFO ==== Request ===","@timestamp":"2015-11-12T06:34:01.471Z"}
2015-12-12 05:26:15 -0800 akai.common: {"date_string":"2015-11-12","time_string":"06:34:01","msec":"473","message":"[ ajp-apr-127.0.0.1-8009-exec-3] LogInterceptor INFO GET /monitor/broker/ HTTP/1.1\n","@timestamp":"2015-11-12T06:34:01.473Z"}
~~~
@ -136,7 +137,7 @@ For instance, by using the record_transformer I would send the hostname and also
Using this example configuration I tried to create a pie chart showing the number of messages per project for a dashboard. Here is what I got.
~~~
~~~ xml
<filter tag.**>
type record_transformer
enable_ruby true
@ -150,7 +151,7 @@ Using this example configuration I tried to create a pie chart showing the numbe
Sample output from stdout:
~~~
~~~ java
2015-12-12 06:01:35 -0800 clear: {"date_string":"2015-10-15","time_string":"06:37:32","msec":"415","message":"[amelJettyClient(0xdc64419)-706] jetty:test/test INFO totallyAnonymousContent: http://whyAreYouReadingThis?:)/history/3374425?limit=1","@timestamp":"2015-10-15T06:37:32.415Z","sourceProject":"Test-Analyzed-Field"}
~~~
@ -169,7 +170,7 @@ And the solution is: When Elasticsearch creates a new index, it will rely on the
And what you basically need to do is to do a curl put with that json content to ES and then all the indices created that are prefixed with `logstash-*` will use that template. Be aware that with the fluent-plugin-elasticsearch you can specify your own index prefix so make sure to adjust the template to match your prefix:
~~~
~~~ java
curl -XPUT localhost:9200/_template/template_doru -d '{
"template" : "logstash-*",
"settings" : {....