Fluentd
Open-source unified data collector and log aggregator from the CNCF ecosystem
ToolObservability PipelinesSelf-hosted, Open source
Pricing: Free (open source) / Commercial support via vendors
Reviewed by the Cyber Vendor Guide 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
Things to check
- 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
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Sources & references
Where the information on this listing comes from. Always verify pricing and capabilities against the vendor before a purchasing decision.
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Key facts
- Pricing
- Free (open source) / Commercial support via vendors
- Model
- Open source
- Founded
- 2011
- Cloud
- No
- Self-hosted
- Yes
- Open source
- Yes
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