Fluentd
Log analysis software
DevSecOps software
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
Take the quiz to check if Fluentd and its alternatives fit your requirements.
Completely free
Free Trial unavailable
Free version
Small
Medium
Large
- Media and communications
- Education and training
- Construction
What is Fluentd
Fluentd is an open-source log and event data collector used to unify data collection and route it to multiple backends for storage, search, and analysis. It is commonly used by platform, SRE, and DevOps teams to aggregate logs from servers, containers, and Kubernetes and forward them to observability or SIEM destinations. Fluentd focuses on a pluggable architecture (inputs/filters/outputs) and a JSON-centric event model to normalize and enrich data in transit. It is often deployed as a daemon/agent or sidecar and configured to support multi-destination routing and buffering.
Broad plugin ecosystem
Fluentd provides a large set of community and vendor-maintained plugins for inputs, parsers, filters, and outputs. This makes it practical to collect from heterogeneous sources and forward to many downstream systems without custom code. The plugin model also supports incremental adoption, where teams start with basic forwarding and later add enrichment, masking, or routing logic. Compared with more end-to-end platforms, Fluentd’s extensibility is a core differentiator.
Flexible routing and buffering
Fluentd supports tag-based routing, conditional processing, and multiple output destinations from a single pipeline. It includes buffering and retry mechanisms that help handle transient downstream outages and backpressure. These capabilities are useful in Kubernetes and distributed environments where log volume and destination availability can vary. The configuration allows teams to separate high-value streams from bulk logs and apply different retention or destinations.
Cloud-native adoption and integrations
Fluentd is widely used in containerized and Kubernetes environments, including common deployment patterns such as DaemonSets. It integrates with popular container runtimes and log formats and can normalize records into structured events. This helps standardize log collection across clusters and environments. It is frequently used as the collection layer feeding dedicated search/analytics or monitoring tools.
Not a full analysis platform
Fluentd primarily collects, transforms, and forwards logs; it does not provide native log search, dashboards, alerting, or long-term storage. Teams typically need to pair it with separate backends for indexing and analysis. This increases solution architecture complexity compared with integrated observability suites. Ownership boundaries (collector vs. backend) can also complicate troubleshooting.
Configuration and tuning complexity
Production deployments often require careful tuning of buffers, flush intervals, memory usage, and retry behavior to avoid data loss or resource pressure. Complex routing and parsing rules can become difficult to maintain as configurations grow. Misconfiguration can lead to duplicated events, dropped records, or high CPU usage under load. Operational maturity is usually required for large-scale pipelines.
Plugin quality varies
Because functionality depends heavily on plugins, reliability and maintenance can vary across integrations. Some plugins may lag behind upstream changes, have limited test coverage, or behave differently across versions. Organizations may need to validate plugins, pin versions, or maintain internal forks for critical paths. This can add ongoing engineering overhead compared with vendor-supported connectors.
Plan & Pricing
| Plan | Price | Key features & notes |
|---|---|---|
| Community (Open Source) | Free — Apache License 2.0 (no licensing cost) | Core Fluentd (open-source data collector), 500+ plugins, community support channels (GitHub, Slack, forums). Unlimited use under Apache 2.0; downloadable from official site. |
| Enterprise Support (via external providers linked on official site) | Pricing not listed on official site — contact providers | Official Fluentd site points to third-party enterprise support/providers for paid SLAs, professional services and managed offerings; vendor pricing/tiers are not published on fluentd.org (contact vendors for quotes). |
Seller details
Fluentd (open-source project; part of the Cloud Native Computing Foundation)
2011
Open Source
https://www.fluentd.org/
https://x.com/fluentd
https://www.linkedin.com/company/fluentd/
