---
title: Fluentd and Fluent Bit Sources
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: Docs > Observability Pipelines > Sources > Fluentd and Fluent Bit Sources
---

# Fluentd and Fluent Bit Sources

{% callout %}
# Important note for users on the following Datadog sites: app.ddog-gov.com

{% alert level="danger" %}
This product is not supported for your selected [Datadog site](https://docs.datadoghq.com/getting_started/site.md). ().
{% /alert %}

{% /callout %}
Available for:
{% icon name="icon-logs" /%}
 Logs 
## Overview{% #overview %}

Use Observability Pipelines' Fluentd or Fluent Bit source to receive logs from the your Fluentd or Fluent Bit agent.

## Prerequisites{% #prerequisites %}

To use Observability Pipelines' Fluentd or Fluent Bit source, you need the following information available:

1. The Observability Pipelines Worker listens on this bind address to receive logs from your applications. For example, `0.0.0.0:8088`. Later on, you configure your applications to send logs to this address.
1. The appropriate TLS certificates and the password you used to create your private key if your forwarders are globally configured to enable SSL.

## Setup{% #setup %}

Set up this source when you [set up a pipeline](https://docs.datadoghq.com/observability_pipelines/configuration/set_up_pipelines.md). You can set up a pipeline in the [UI](https://app.datadoghq.com/observability-pipelines), using the [API](https://docs.datadoghq.com/api/latest/observability-pipelines.md), or with [Terraform](https://registry.terraform.io/providers/datadog/datadog/latest/docs/resources/observability_pipeline). The instructions in this section are for setting up the source in the UI.

{% alert level="danger" %}
Only enter the identifiers for the Fluent address and, if applicable, the TLS key pass. Do not enter the actual values.
{% /alert %}

1. Enter the identifier for your Fluent address. If you leave it blank, the default is used.

### Optional settings{% #optional-settings %}

Toggle the switch to **Enable TLS**.

- If you are using Secrets Management, enter the identifier for the key pass. See Set secrets for the default used if the field is left blank.
- The following certificate and key files are required:
  - `Server Certificate Path`: The path to the certificate file that has been signed by your Certificate Authority (CA) root file in DER, PEM, or CRT (X.509).
  - `CA Certificate Path`: The path to the certificate file that is your Certificate Authority (CA) root file in DER, PEM, or CRT (X.509).
  - `Private Key Path`: The path to the `.key` private key file that belongs to your Server Certificate Path in DER, PEM, or CRT (PKCS #8) format.
  - **Notes**:
    - The configuration data directory `/var/lib/observability-pipelines-worker/config/` is automatically appended to the file paths. See [Advanced Worker Configurations](https://docs.datadoghq.com/observability_pipelines/configuration/install_the_worker/advanced_worker_configurations.md) for more information.
    - The file must be readable by the `observability-pipelines-worker` group and user.

## Set secrets{% #set-secrets %}

These are the defaults used for secret identifiers and environment variables.

**Note**: If you enter secret identifiers and then choose to use environment variables, the environment variable is the identifier entered and prepended with `DD_OP`. For example, if you entered `PASSWORD_1` for a password identifier, the environment variable for that password is `DD_OP_PASSWORD_1`.

{% tab title="Secrets Management" %}

- Fluent address identifier:
  - References the address on which the Observability Pipelines Worker listens for incoming log messages.
  - The default identifier is `SOURCE_FLUENT_ADDRESS`.
- Fluent TLS passphrase identifier (when TLS is enabled):
  - The default identifier is `SOURCE_FLUENT_KEY_PASS`.

{% /tab %}

{% tab title="Environment Variables" %}

- Fluent socket address and port:
  - The Observability Pipelines Worker listens on this address for incoming log messages.
  - The default environment variable is `DD_OP_SOURCE_FLUENT_ADDRESS`.
- Fluent Bit TLS passphrase (when enabled):
  - The default environment variable is `DD_OP_SOURCE_FLUENT_KEY_PASS`.

{% /tab %}

## Send logs to the Observability Pipelines Worker over Fluent{% #send-logs-to-the-observability-pipelines-worker-over-fluent %}

### Fluent Bit configuration{% #fluent-bit-configuration %}

To configure Fluent Bit to send logs to the Observability Pipelines Worker, use the following output configuration:

```
[OUTPUT]
	Name          forward
	Match         *
	# Update these to point to your Observability Pipelines Worker
	Host          127.0.0.1
	Port          24224
```

### Fluentd configuration{% #fluentd-configuration %}

To configure Fluentd to send logs to the Observability Pipelines Worker, use the following output configuration:

```
<match *>
	  @type forward
	  <server>
		# Update these to point to your Observability Pipelines Worker
		name  local
		host  127.0.0.1
		port 24224
	  </server>
	  compress gzip
	</match>
```