Envoy Outlier Detection Brownouts: When the Mesh Ejects Healthy Pods
Debug Istio/Envoy outlier detection brownouts: why healthy pods get ejected and 503s spike in production. Includes xDS checks, safe fixes, and alerting.
#service-mesh
3 posts
Envoy/Istio 503 UF/UO/UT: When the Mesh, Not the App, Is Your Outage
Envoy/Istio can return 503 UF/UO/UT when connection pools overflow. Decode flags, inspect proxy stats, patch DestinationRules, and verify fast.
Ephemeral Port Exhaustion: The Node That 'Goes Bad'
A single Kubernetes node starts failing connections to external services while pods look healthy. The hidden cause: sidecar proxies exhausting ephemeral ports with short-lived connections.