envoy.yaml

static_resources:
  listeners:
    - address:
        socket_address:
          address: 0.0.0.0
          port_value: 80
      filter_chains:
          - filters:
            - name: envoy.http_connection_manager
              typed_config:
                "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
                stat_prefix: ingress_http
                route_config:
                  name: local_route
                  virtual_hosts:
                    - name: backend
                      domains: ["*"]
                      routes:
                        - match: 
                            prefix: "/" 
                          route: 
                            cluster: service
                http_filters:
                  - name: envoy.ext_authz
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.ext_authz.v3.ExtAuthz
                      failure_mode_allow: false
                      grpc_service:
                        google_grpc:
                          target_uri: opa:9191
                          stat_prefix: ext_authz
                        timeout: 0.5s
                      transport_api_version: V3
                  - name: envoy.filters.http.router
                    typed_config: {}
  clusters:
    - name: service
      connect_timeout: 0.25s
      type: strict_dns
      lb_policy: round_robin
      load_assignment:
        cluster_name: service
        endpoints:
          - lb_endpoints:
            - endpoint:
                address:
                  socket_address:
                    address: ${SERVICE_NAME}
                    port_value: ${SERVICE_PORT}