opt in control plane zone aware load balancing

Signed-off-by: Huabing (Robin) Zhao <[email protected]>

Author: zhaohuabing

charts/gateway-helm/README.md

@@ -111,4 +111,5 @@ To uninstall the chart:
 | kubernetesClusterDomain | string | `"cluster.local"` |  |
 | podDisruptionBudget.minAvailable | int | `0` |  |
 | service.annotations | object | `{}` |  |
+| service.trafficDistribution | string | `""` |  |
 

charts/gateway-helm/templates/envoy-gateway-service.yaml

@@ -16,3 +16,6 @@ spec:
   {{- include "eg.selectorLabels" . | nindent 4 }}
   ports:
   {{- .Values.deployment.ports | toYaml | nindent 2 -}}
+  {{- with .Values.service.trafficDistribution }}
+  trafficDistribution: {{ . }}
+  {{- end }}

charts/gateway-helm/values.tmpl.yaml

@@ -72,6 +72,8 @@ deployment:
     nodeSelector: {}
 
 service:
+  # If set to PreferClose, the Envoy fleet will prioritize connecting to the Envoy Gateway pods that are topologically closest to them.
+  trafficDistribution: ""
   annotations: {}
 
 hpa:

release-notes/current.yaml

@@ -25,6 +25,7 @@ new features: |
   Added support for BackendTLSPolicy to target ServiceImport
   Added support for per-host circuit breaker thresholds
   Added support for egctl Websocket in addation to SPDY
+  Added a configuration option in the Helm chart to set the TrafficDistribution field in the Envoy Gateway Service
 
 bug fixes: |
   Fix traffic splitting when filters are attached to the backendRef.

site/content/en/latest/install/gateway-helm-api.md

@@ -75,4 +75,5 @@ The Helm chart for Envoy Gateway
 | kubernetesClusterDomain | string | `"cluster.local"` |  |
 | podDisruptionBudget.minAvailable | int | `0` |  |
 | service.annotations | object | `{}` |  |
+| service.trafficDistribution | string | `""` |  |
 

test/helm/gateway-helm/service-annotations.in.yaml test/helm/gateway-helm/service-customization.in.yaml

@@ -4,5 +4,6 @@ global:
       image: "docker.io/envoyproxy/gateway-dev:latest"
       pullPolicy: Always
 service:
+  trafficDistribution: PreferClose
   annotations:
     this: that

test/helm/gateway-helm/service-annotations.out.yaml test/helm/gateway-helm/service-customization.out.yaml

@@ -355,6 +355,7 @@ spec:
   - name: metrics
     port: 19001
     targetPort: 19001
+  trafficDistribution: PreferClose
 ---
 # Source: gateway-helm/templates/envoy-gateway-deployment.yaml
 apiVersion: apps/v1