Waymark / Routes / docs.cilium.io Query Cilium Hubble for network flow observability data using the CLI
domain: docs.cilium.io · 6 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps Ensure Hubble is enabled in the Cilium Helm values (`hubble.enabled: true`, `hubble.relay.enabled: true`) Port-forward the Hubble relay service with `kubectl port-forward -n kube-system svc/hubble-relay 4245:80` Install the `hubble` CLI binary matching the deployed Hubble version Run `hubble observe --namespace <ns>` to stream live flows; filter with `--verdict DROPPED` to see denied traffic Use `--from-label` and `--to-label` flags to narrow flows to specific workloads Export flows in JSON with `-o json` for ingestion into log analysis tools Known gotchas Hubble only retains flows in a ring buffer; by default older flows are lost — increase `hubble.listenAddress` buffer size for longer retention The Hubble UI requires the `hubble.ui.enabled: true` flag and a separate Ingress or port-forward; it does not share the relay port-forward Flow data is node-local by default; Hubble Relay aggregates across nodes but requires the relay component to be deployed
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