Sidecar per pod
Every application pod has an Envoy sidecar. App talks to localhost:port; sidecar handles TLS, retries, routing.
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Sidecar per pod
Every application pod has an Envoy sidecar. App talks to localhost:port; sidecar handles TLS, retries, routing.
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Control plane
Istio Pilot or Linkerd's control plane pushes config to sidecars via xDS (dynamic configuration API).