https://github.com/jun06t/grpc-sample/tree/master/envoy-front-proxy

front-proxy-config

static_resources:
  listeners:
  - address:
      socket_address:
        address: 0.0.0.0
        port_value: 8000
    filter_chains:
    - filters:
      - name: envoy.http_connection_manager
        config:
          codec_type: auto
          stat_prefix: ingress_http
          route_config:
            name: local_route
            virtual_hosts:
            - name: backend
              domains:
              - "*"
              routes:
              - match:
                  prefix: "/"
                route:
                  cluster: grpc
          access_log:
          - name: envoy.file_access_log
            config:
              path: "/dev/stdout"
          http_filters:
          - name: envoy.router
            config: {}
  clusters:
  - name: grpc
    connect_timeout: 0.25s
    type: strict_dns
    lb_policy: round_robin
    http2_protocol_options: {}
    health_checks:
    - timeout: 5s
      interval: 10s
      unhealthy_threshold: 2
      healthy_threshold: 2
      tcp_health_check: {}
    hosts:
    - socket_address:
        address: backend
        port_value: 8080
admin:
  access_log_path: /dev/null
  address:
    socket_address:
      address: 0.0.0.0
      port_value: 8001