Fluentd → Loki: Examples

Start the stack

make start_observability_stack

This includes Fluentd (HTTP: 9880, Forward: 24224) and Loki (3100).

Emit logs

Use the provided CLI to send sample logs via Fluentd Forward:

make run_logger_fluentd

You can also send JSON via HTTP (root path accepts the payload with tag/record):

curl -X POST -H 'Content-Type: application/json' \
  -d '{"tag":"interviewing.golang","time":null,"record":{"message":"hello","app":"interviewing-golang","env":"dev"}}' \
  http://localhost:9880/

Query logs in Grafana

Open Grafana → Explore → Datasource: Loki
Run a simple query:

{job="fluentd"}

Or filter by our labels:

{app="interviewing-golang", env="dev"}

Notes

Fluentd config: env/fluentd/fluent.conf
Loki config: env/loki/config.yaml
Grafana datasource: env/grafana/provisioning/datasources/loki.yml
For production, secure Fluentd inputs and consider structured logs with consistent labels.

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