Fluentd has nine (9) types of plugins:

• ​Input​

• ​Parser​

• ​Filter​

• ​Output​

• ​Formatter​

• ​Storage​

• ​Service Discovery​

• ​Buffer​

• ​Metrics​

This article gives an overview of Storage Plugin.

Overview

Sometimes, the input/filter/output plugin needs to save its internal state in memory, storage, or key-value store. Fluentd has a pluggable system called Storage that lets a plugin store and reuse its internal state as key-value pairs.

How To Use

For an input, an output, and filter plugin that supports Storage, the <storage> directive can be used to store key-value pair into a key-value store such as a JSON file, MongoDB, Redis, etc.

Here is an example with in_sample:

<source>
  @type sample
  tag docs.fluentd.storage
  <storage awesome_path>
    @type my_custom_storage
  </storage>
</source>

List of Built-in Storage

• ​local​

List of Core Plugins with Storage support

• ​in_sample​

List of 3rd party storage plugins

NOTE: This 3rd party storage plugin list does not fully covers all of them.

• ​fluent-plugin-storage-leveldb​

• ​fluent-plugin-storage-memcached​

• ​fluent-plugin-storage-mongo​

• ​fluent-plugin-storage-redis​

List of 3rd party Plugins with Storage support

NOTE: This 3rd party plugin list does not fully covers all of them.

• ​fluent-plugin-systemd​

• ​fluent-plugin-windows-eventlog​

If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is an open-source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.