Fingerprint filter pluginedit

  • Plugin version: v3.1.1
  • Released on: 2017-08-15
  • Changelog

Installationedit

For plugins not bundled by default, it is easy to install by running bin/logstash-plugin install logstash-filter-fingerprint. See Working with plugins for more details.

Getting Helpedit

For questions about the plugin, open a topic in the Discuss forums. For bugs or feature requests, open an issue in Github. For the list of Elastic supported plugins, please consult the Elastic Support Matrix.

Descriptionedit

Create consistent hashes (fingerprints) of one or more fields and store the result in a new field.

This can e.g. be used to create consistent document ids when inserting events into Elasticsearch, allowing events in Logstash to cause existing documents to be updated rather than new documents to be created.

Note

When using any method other than UUID, PUNCTUATION or MURMUR3 you must set the key, otherwise the plugin will raise an exception

Note

When the target option is set to UUID the result won’t be a consistent hash but a random UUID. To generate UUIDs, prefer the uuid filter.

Fingerprint Filter Configuration Optionsedit

This plugin supports the following configuration options plus the Common Options described later.

Setting Input typeRequired

base64encode

boolean

No

concatenate_sources

boolean

No

concatenate_sources

boolean

No

key

string

No

method

string, one of ["SHA1", "SHA256", "SHA384", "SHA512", "MD5", "MURMUR3", "IPV4_NETWORK", "UUID", "PUNCTUATION"]

Yes

source

array

No

target

string

No

Also see Common Options for a list of options supported by all filter plugins.

 

base64encodeedit

  • Value type is boolean
  • Default value is false

When set to true, the SHA1, SHA256, SHA384, SHA512 and MD5 fingerprint methods will produce base64 encoded rather than hex encoded strings.

concatenate_sourcesedit

  • Value type is boolean
  • Default value is false

When set to true and method isn’t UUID or PUNCTUATION, the plugin concatenates the names and values of all fields given in the source option into one string (like the old checksum filter) before doing the fingerprint computation. If false and multiple source fields are given, the target field will be an array with fingerprints of the source fields given.

concatenate_sourcesedit

  • Value type is boolean
  • Default value is false

When set to true and method isn’t UUID or PUNCTUATION, the plugin concatenates the names and values of all fields of the event into one string (like the old checksum filter) before doing the fingerprint computation. If false and at least one source field is given, the target field will be an array with fingerprints of the source fields given.

keyedit

  • Value type is string
  • There is no default value for this setting.

When used with the IPV4_NETWORK method fill in the subnet prefix length. Key is required with all methods except MURMUR3, PUNCTUATION or UUID. With other methods fill in the HMAC key.

methodedit

  • This is a required setting.
  • Value can be any of: SHA1, SHA256, SHA384, SHA512, MD5, MURMUR3, IPV4_NETWORK, UUID, PUNCTUATION
  • Default value is "SHA1"

The fingerprint method to use.

If set to SHA1, SHA256, SHA384, SHA512, or MD5 the cryptographic keyed-hash function with the same name will be used to generate the fingerprint. If set to MURMUR3 the non-cryptographic MurmurHash function will be used.

If set to IPV4_NETWORK the input data needs to be a IPv4 address and the hash value will be the masked-out address using the number of bits specified in the key option. For example, with "1.2.3.4" as the input and key set to 16, the hash becomes "1.2.0.0".

If set to PUNCTUATION, all non-punctuation characters will be removed from the input string.

If set to UUID, a UUID will be generated. The result will be random and thus not a consistent hash.

sourceedit

  • Value type is array
  • Default value is "message"

The name(s) of the source field(s) whose contents will be used to create the fingerprint. If an array is given, see the concatenate_sources option.

targetedit

  • Value type is string
  • Default value is "fingerprint"

The name of the field where the generated fingerprint will be stored. Any current contents of that field will be overwritten.

Common Optionsedit

The following configuration options are supported by all filter plugins:

add_fieldedit

  • Value type is hash
  • Default value is {}

If this filter is successful, add any arbitrary fields to this event. Field names can be dynamic and include parts of the event using the %{field}.

Example:

filter {
  fingerprint {
    add_field => { "foo_%{somefield}" => "Hello world, from %{host}" }
  }
}
# You can also add multiple fields at once:
filter {
  fingerprint {
    add_field => {
      "foo_%{somefield}" => "Hello world, from %{host}"
      "new_field" => "new_static_value"
    }
  }
}

If the event has field "somefield" == "hello" this filter, on success, would add field foo_hello if it is present, with the value above and the %{host} piece replaced with that value from the event. The second example would also add a hardcoded field.

add_tagedit

  • Value type is array
  • Default value is []

If this filter is successful, add arbitrary tags to the event. Tags can be dynamic and include parts of the event using the %{field} syntax.

Example:

filter {
  fingerprint {
    add_tag => [ "foo_%{somefield}" ]
  }
}
# You can also add multiple tags at once:
filter {
  fingerprint {
    add_tag => [ "foo_%{somefield}", "taggedy_tag"]
  }
}

If the event has field "somefield" == "hello" this filter, on success, would add a tag foo_hello (and the second example would of course add a taggedy_tag tag).

enable_metricedit

  • Value type is boolean
  • Default value is true

Disable or enable metric logging for this specific plugin instance by default we record all the metrics we can, but you can disable metrics collection for a specific plugin.

  • Value type is string
  • There is no default value for this setting.

Add a unique ID to the plugin configuration. If no ID is specified, Logstash will generate one. It is strongly recommended to set this ID in your configuration. This is particularly useful when you have two or more plugins of the same type, for example, if you have 2 fingerprint filters. Adding a named ID in this case will help in monitoring Logstash when using the monitoring APIs.

filter {
  fingerprint {
    id => "ABC"
  }
}

periodic_flushedit

  • Value type is boolean
  • Default value is false

Call the filter flush method at regular interval. Optional.

remove_fieldedit

  • Value type is array
  • Default value is []

If this filter is successful, remove arbitrary fields from this event. Example:

filter {
  fingerprint {
    remove_field => [ "foo_%{somefield}" ]
  }
}
# You can also remove multiple fields at once:
filter {
  fingerprint {
    remove_field => [ "foo_%{somefield}", "my_extraneous_field" ]
  }
}

If the event has field "somefield" == "hello" this filter, on success, would remove the field with name foo_hello if it is present. The second example would remove an additional, non-dynamic field.

remove_tagedit

  • Value type is array
  • Default value is []

If this filter is successful, remove arbitrary tags from the event. Tags can be dynamic and include parts of the event using the %{field} syntax.

Example:

filter {
  fingerprint {
    remove_tag => [ "foo_%{somefield}" ]
  }
}
# You can also remove multiple tags at once:
filter {
  fingerprint {
    remove_tag => [ "foo_%{somefield}", "sad_unwanted_tag"]
  }
}

If the event has field "somefield" == "hello" this filter, on success, would remove the tag foo_hello if it is present. The second example would remove a sad, unwanted tag as well.