Egress tracing for calling to external service

docker-compose.yml

version: '2'
services:
  sample-app:
    build:
      context: .
    volumes:
      - ./service-envoy.yaml:/etc/service-envoy.yaml
    ports:
      - "8081:8081"
    expose:
      - "8081"
  zipkin:
    image: openzipkin/zipkin
    container_name: zipkin
    ports:
      - 9411:9411

Dockerfile

FROM envoyproxy/envoy:latest as proxy
RUN apt-get update
RUN apt-get -y install curl
CMD /usr/local/bin/envoy -c /etc/service-envoy.yaml --service-cluster servicemain

service-envoy.yaml

static_resources:
  listeners:
  - address:
      socket_address:
        address: 0.0.0.0
        port_value: 9000
    filter_chains:
    - filters:
      - name: envoy.http_connection_manager
        config:
          tracing:
            operation_name: egress
          codec_type: auto
          stat_prefix: egress_http
          route_config:
            name: httpbin_route
            virtual_hosts:
            - name: httpbin_service
              domains:
              - "*"
              routes:
              - match:
                  prefix: "/"
                route:
                  cluster: httpbin_service
                  host_rewrite: www.httpbin.org
                decorator:
                  operation: checkStock
          http_filters:
          - name: envoy.router
            config: {}
  clusters:
  - name: httpbin_service
    connect_timeout: 2.5s
    type: LOGICAL_DNS
    dns_lookup_family: V4_ONLY
    lb_policy: round_robin
    hosts:
    - socket_address:
        address: httpbin.org
        port_value: 443
    tls_context: { sni: www.httpbin.org }
  - name: zipkin
    connect_timeout: 1s
    type: strict_dns
    lb_policy: round_robin
    hosts:
    - socket_address:
        address: zipkin
        port_value: 9411
tracing:
  http:
    name: envoy.zipkin
    config:
      collector_cluster: zipkin
      collector_endpoint: "/api/v1/spans"
admin:
  access_log_path: "/dev/null"
  address:
    socket_address:
      address: 0.0.0.0
      port_value: 8081