Fluentd

Open-source unified data collector and log aggregator from the CNCF ecosystem

ToolOpen Source Data PipelineOpen SourceSelf-hosted

Pricing: Free (open source) / Commercial support via vendors

Reviewed by the CyberSecTool editorial team against the public sources cited below · Last reviewed February 2026 · How we review listings

What is Fluentd?

Fluentd is an open-source data collector that unifies data collection and consumption for better use and understanding of data. A CNCF graduated project, Fluentd provides a unified logging layer that allows you to collect data from multiple sources, transform it, and route it to various destinations. Its plugin-based architecture and lightweight footprint make it a popular choice for containerized and cloud-native environments.

Best for: Cloud-native teams wanting a lightweight, proven open-source data collector with a massive plugin ecosystem
Pros
  • ✓ Massive plugin ecosystem (800+ plugins)
  • ✓ Lightweight and efficient resource usage
  • ✓ CNCF graduated. Proven in production at scale
  • ✓ Excellent Kubernetes and container integration
  • ✓ Large community and extensive documentation
Considerations
  • • Limited transformation capabilities vs. dedicated pipelines
  • • Configuration can be complex for advanced use cases
  • • Ruby-based performance limitations at very high scale
  • • No built-in GUI for pipeline design
  • • Requires custom development for security-specific use cases

Reported in public reviews and vendor documentation. See sources below.

Key Features

→Unified logging layer
→800+ community plugins
→Lightweight resource footprint
→Buffering and retry mechanisms
→Tag-based routing
→Built-in reliability and failover
→JSON-structured logging
→CNCF graduated project

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Fluentd Comparisons

Fluentd vs Azure Data Explorer→Fluentd vs Cribl→Fluentd vs Splunk Data Stream Processor→Fluentd vs Tenzir→Fluentd vs Vector→Fluentd vs Mezmo→Fluentd vs Datadog Observability Pipelines→Fluentd vs Observo AI→Fluentd vs Realm.Security→

Sources & references

Where the information on this listing comes from. Always verify pricing and capabilities against the vendor before a purchasing decision.

Fluentd — official websitePrimary source
Fluentd questions on Stack Overflow
Stack Overflow

Spot an error, or do you represent Fluentd? Request a correction.

Quick Info
PricingFree (open source) / Commercial support via vendors
ModelOpen source
Founded2011
CloudNo
Self-HostedYes
Open SourceYes
Visit Website →View on GitHub →

Last updated: Feb 20, 2026

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In the glossary
Security Data Pipeline