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DevOps & Automation · Intermediate

Fluentd

An open-source CNCF graduated log collector that unifies log collection, parsing, buffering, and routing to many outputs.

Definition

Fluentd uses input, filter, and output plugins to build logging pipelines and is often deployed as a Kubernetes DaemonSet. Fluent Bit is its lightweight sibling, preferred for resource-constrained nodes and edge devices.

Example

A Fluent Bit DaemonSet tails container logs from /var/log/containers and forwards them to Elasticsearch.

Exam tip

In Kubernetes, node-level log agents run as DaemonSets.

Related terms