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Elastic Docs ›Filebeat Reference [7.2] ›Configuring Filebeat ›Filter and enhance the exported data

Define processors

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Define processors

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You can use processors to filter and enhance data before sending it to the configured output. To define a processor, you specify the processor name, an optional condition, and a set of parameters:

processors:
- <processor_name>:
    when:
      <condition>
    <parameters>

- <processor_name>:
    when:
      <condition>
    <parameters>

...

Where:

  • <processor_name> specifies a processor that performs some kind of action, such as selecting the fields that are exported or adding metadata to the event.
  • <condition> specifies an optional condition. If the condition is present, then the action is executed only if the condition is fulfilled. If no condition is passed, then the action is always executed.
  • <parameters> is the list of parameters to pass to the processor.

More complex conditional processing can be accomplished by using the if-then-else processor configuration. This allows multiple processors to be executed based on a single condition.

processors:
- if:
    <condition>
  then: 
    - <processor_name>:
        <parameters>
    - <processor_name>:
        <parameters>
    ...
  else: 
    - <processor_name>:
        <parameters>
    - <processor_name>:
        <parameters>
    ...

then must contain a single processor or a list of one or more processors to execute when the condition evaluates to true.

else is optional. It can contain a single processor or a list of processors to execute when the conditional evaluate to false.

Where are processors valid?

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Processors are valid:

  • At the top-level in the configuration. The processor is applied to all data collected by Filebeat.

  • Under a specific input. The processor is applied to the data collected for that input.

    - type: <input_type>
  processors:
  - <processor_name>:
      when:
        <condition>
      <parameters>
...

    Similarly, for Filebeat modules, you can define processors under the input section of the module definition.

Processors

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The supported processors are:

Conditions

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Each condition receives a field to compare. You can specify multiple fields under the same condition by using AND between the fields (for example, field1 AND field2).

For each field, you can specify a simple field name or a nested map, for example dns.question.name.

See Exported fields for a list of all the fields that are exported by Filebeat.

The supported conditions are:

equals

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With the equals condition, you can compare if a field has a certain value. The condition accepts only an integer or a string value.

For example, the following condition checks if the response code of the HTTP transaction is 200:

equals:
  http.response.code: 200

contains

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The contains condition checks if a value is part of a field. The field can be a string or an array of strings. The condition accepts only a string value.

For example, the following condition checks if an error is part of the transaction status:

contains:
  status: "Specific error"

regexp

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The regexp condition checks the field against a regular expression. The condition accepts only strings.

For example, the following condition checks if the process name starts with foo:

regexp:
  system.process.name: "foo.*"

range

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The range condition checks if the field is in a certain range of values. The condition supports lt, lte, gt and gte. The condition accepts only integer or float values.

For example, the following condition checks for failed HTTP transactions by comparing the http.response.code field with 400.

range:
    http.response.code:
        gte: 400

This can also be written as:

range:
    http.response.code.gte: 400

The following condition checks if the CPU usage in percentage has a value between 0.5 and 0.8.

range:
    system.cpu.user.pct.gte: 0.5
    system.cpu.user.pct.lt: 0.8

network

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The network condition checks if the field is in a certain IP network range. Both IPv4 and IPv6 addresses are supported. The network range may be specified using CIDR notation, like "192.0.2.0/24" or "2001:db8::/32", or by using one of these named ranges:

  • loopback - Matches loopback addresses in the range of 127.0.0.0/8 or ::1/128.
  • unicast - Matches global unicast addresses defined in RFC 1122, RFC 4632, and RFC 4291 with the exception of the IPv4 broadcast address (255.255.255.255). This includes private address ranges.
  • multicast - Matches multicast addresses.
  • interface_local_multicast - Matches IPv6 interface-local multicast addresses.
  • link_local_unicast - Matches link-local unicast addresses.
  • link_local_multicast - Matches link-local multicast addresses.
  • private - Matches private address ranges defined in RFC 1918 (IPv4) and RFC 4193 (IPv6).
  • public - Matches addresses that are not loopback, unspecified, IPv4 broadcast, link local unicast, link local multicast, interface local multicast, or private.
  • unspecified - Matches unspecified addresses (either the IPv4 address "0.0.0.0" or the IPv6 address "::").

The following condition returns true if the source.ip value is within the private address space.

network:
    source.ip: private

This condition returns true if the destination.ip value is within the IPv4 range of 192.168.1.0 - 192.168.1.255.

network:
    destination.ip: '192.168.1.0/24'

And this condition returns true when destination.ip is within any of the given subnets.

network:
    destination.ip: ['192.168.1.0/24', '10.0.0.0/8', loopback]

has_fields

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The has_fields condition checks if all the given fields exist in the event. The condition accepts a list of string values denoting the field names.

For example, the following condition checks if the http.response.code field is present in the event.

has_fields: ['http.response.code']

or

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The or operator receives a list of conditions.

or:
  - <condition1>
  - <condition2>
  - <condition3>
  ...

For example, to configure the condition http.response.code = 304 OR http.response.code = 404:

or:
  - equals:
      http.response.code: 304
  - equals:
      http.response.code: 404

and

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The and operator receives a list of conditions.

and:
  - <condition1>
  - <condition2>
  - <condition3>
  ...

For example, to configure the condition http.response.code = 200 AND status = OK:

and:
  - equals:
      http.response.code: 200
  - equals:
      status: OK

To configure a condition like <condition1> OR <condition2> AND <condition3>:

or:
 - <condition1>
 - and:
    - <condition2>
    - <condition3>

not

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The not operator receives the condition to negate.

not:
  <condition>

For example, to configure the condition NOT status = OK:

not:
  equals:
    status: OK
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