Forward is the protocol used by Fluent Bit and Fluentd to route messages between peers. This plugin implements the input service to listen for Forward messages.

Configuration Parameters

The plugin supports the following configuration parameters:

Key Description
Listen Listener network interface, default:
Port TCP port where listening for connections, default: 24224.
Buffer_Size Specify the maximum buffer size in KB to receive a Forward message. If not set, the default size will be the value of Chunk_Size.
Chunk_Size By default the buffer to store the incoming Forward messages, do not allocate the maximum memory allowed, instead it allocate memory when is required. The rounds of allocations are set by Chunk_Size in KB. If not set, Chunk_Size is equal to 32 (32KB).

Getting Started

In order to receive Forward messages, you can run the plugin from the command line or through the configuration file:

Command Line

From the command line you can let Fluent Bit listen for Forward messages with the following options:

$ fluent-bit -i forward -o stdout

By default the service will listen an all interfaces ( through TCP port 24224, optionally you can change this directly, e.g:

$ fluent-bit -i forward:// -o stdout

In the example the Forward messages will only arrive through network interface under address and TCP Port 9090.

Configuration File

In your main configuration file append the following Input & Output sections:

    Name        forward
    Port        24224
    Chunk_Size  32
    Buffer_Size 64

    Name   stdout
    Match  *


Once Fluent Bit is running, you can send some messages using the fluent-cat tool (this tool is provided by Fluentd:

$ echo '{"key 1": 123456789, "key 2": "abcdefg"}' | fluent-cat my_tag

In Fluent Bit we should see the following output:

$ bin/fluent-bit -i forward -o stdout
Fluent-Bit v0.9.0
Copyright (C) Treasure Data

[2016/10/07 21:49:40] [ info] [engine] started
[2016/10/07 21:49:40] [ info] [in_fw] binding
[0] my_tag: [1475898594, {"key 1"=>123456789, "key 2"=>"abcdefg"}]

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