Fluentd
0.12
0.12
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  • Output Plugins
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  • Buffer Plugins
    • memory
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  • Filter Plugins
    • record_transformer
    • grep
    • parser
    • stdout
  • Parser Plugins
    • regexp
    • apache2
    • apache_error
    • nginx
    • syslog
    • ltsv
    • csv
    • tsv
    • json
    • multiline
    • none
  • Formatter Plugins
    • out_file
    • json
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    • msgpack
    • hash
    • single_value
  • Developer
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  • Articles
    • Store Apache Logs into MongoDB
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    • Before Install
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    • Quickstart
    • Raspberrypi Cloud Data Logger
    • Recipe Apache Logs To Elasticsearch
    • Recipe Apache Logs To Mongo
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    • Recipe Cloudstack To Mongodb
    • Recipe Csv To Elasticsearch
    • Recipe Csv To Mongo
    • Recipe Csv To S3
    • Recipe Csv To Treasure Data
    • Recipe Http Rest Api To Elasticsearch
    • Recipe Http Rest Api To Mongo
    • Recipe Http Rest Api To S3
    • Recipe Http Rest Api To Treasure Data
    • Recipe Json To Elasticsearch
    • Recipe Json To Mongo
    • Recipe Json To S3
    • Recipe Json To Treasure Data
    • Recipe Nginx To Elasticsearch
    • Recipe Nginx To Mongo
    • Recipe Nginx To S3
    • Recipe Nginx To Treasure Data
    • Recipe Syslog To Elasticsearch
    • Recipe Syslog To Mongo
    • Recipe Syslog To S3
    • Recipe Syslog To Treasure Data
    • Recipe Tsv To Elasticsearch
    • Recipe Tsv To Mongo
    • Recipe Tsv To S3
    • Recipe Tsv To Treasure Data
    • Ruby
    • Scala
    • Splunk Like Grep And Alert Email
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  • Overview
  • How to Use
  • List of Filter Plugins

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Filter Plugins

PreviousfileNextrecord_transformer

Last updated 5 years ago

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Fluentd has 6 types of plugins: , , , , and . This article gives an overview of Filter Plugin.

Overview

Filter plugins enables Fluentd to modify event streams. Example use cases are:

  1. Filtering out events by grepping the value of one or more fields.

  2. Enriching events by adding new fields.

  3. Deleting or masking certain fields for privacy and compliance.

How to Use

It is used with the <filter> directive as follows:

<filter foo.bar>
  @type grep
  regexp1 message cool
</filter>

The above directive matches events with the tag "foo.bar", and if the "message" field's value contains "cool", the events go through the rest of the configuration.

Like the <match> directive for output plugins, <filter> matches against a tag. Once the event is processed by the filter, the event proceeds through the configuration top-down. Hence, if there are multiple filters for the same tag, they are applied in descending order. Hence, in the following example,

<filter foo.bar>
  @type grep
  regexp1 message cool
</filter>

<filter foo.bar>
  @type record_transformer
  <record>
    hostname "#{Socket.gethostname}"
  </record>
</filter>

Only the events whose "message" field contain "cool" get the new field "hostname" with the machine's hostname as its value.

List of Filter Plugins

Users can create their own custom plugins with a bit of Ruby. See for more information.

If this article is incorrect or outdated, or omits critical information, please . is a open source project under . All components are available under the Apache 2 License.

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record-transformer
filter_stdout
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