分布式跟踪在dapr里是开箱即用的，不需要对应用作任何一丁点的侵入式编程。之前的开发，如果想实现分式跟踪，就得在应用中埋点，这是一个与业务无关系的动作。dpar通过sidecar可以轻松做到这点，从而让程序员更多精力投入到业务中，又让运维得到可观测性能数据，对服务运维保驾护航。从此以后，开发和运维再没有爱恨情愁，可以友好的做朋友。

接上一篇的docker-compose部署，在docker-compose.yam中只需要增加zipkin在的节点，并且每个服务的sidecar启动时指定zipkin配置即可。

version: '3.4'
services:#┌────────────────────────────────┐#│ ordersystem app + Dapr sidecar │#└────────────────────────────────┘ordersystem:image: ${DOCKER_REGISTRY-}ordersystemdepends_on:- redis- placement - rabbitmq         - zipkin       build:context: ../dockerfile: OrderSystem/Dockerfileports:- "3500:3500"    volumes:   - ../OrderSystem:/OrderSystem  networks:- b2c-daprordersystem-dapr:image: "daprio/daprd:latest"command: [ "./daprd", "-app-id", "order", "-app-port", "80","-placement-host-address", "placement:50006","-components-path","/components","-config","/home/nonroot/.dapr/config.yaml" ]depends_on:- ordersystemnetwork_mode: "service:ordersystem"volumes:   - ../components:/components - ../:/home/nonroot/.dapr        #┌───────────────────────────────────┐#│ paymentsystem1 app + Dapr sidecar │#└───────────────────────────────────┘  paymentsystem1:image: ${DOCKER_REGISTRY-}paymentsystemdepends_on:- redis- placement - rabbitmq   - zipkin      build:context: ../dockerfile: PaymentSystem/Dockerfileports:- "3601:3500"volumes:   - ../PaymentSystem:/PaymentSystem      networks:- b2c-dapr      paymentsystem1-dapr:image: "daprio/daprd:latest"command: [ "./daprd", "-app-id", "pay", "-app-port", "80","-placement-host-address", "placement:50006","-components-path","/components","-config","/home/nonroot/.dapr/config.yaml" ]depends_on:- paymentsystem1network_mode: "service:paymentsystem1"volumes:   - ../components:/components - ../:/home/nonroot/.dapr     #┌───────────────────────────────────┐#│ paymentsystem2 app + Dapr sidecar │#└───────────────────────────────────┘   paymentsystem2:image: ${DOCKER_REGISTRY-}paymentsystemdepends_on:- redis- placement   - rabbitmq   - zipkin        build:context: ../dockerfile: PaymentSystem/Dockerfilevolumes:   - ../PaymentSystem:/PaymentSystem            ports:- "3602:3500"networks:- b2c-dapr      paymentsystem2-dapr:image: "daprio/daprd:latest"command: [ "./daprd", "-app-id", "pay", "-app-port", "80" ,"-placement-host-address", "placement:50006","-components-path","/components","-config","/home/nonroot/.dapr/config.yaml"]depends_on:- paymentsystem2network_mode: "service:paymentsystem2"volumes:   - ../components:/components       - ../:/home/nonroot/.dapr     #┌───────────────────────────────────┐#│ noticesystem1 app + Dapr sidecar  │#└───────────────────────────────────┘  noticesystem1:image: ${DOCKER_REGISTRY-}noticesystemdepends_on:- redis- placement  - rabbitmq  - zipkin         build:context: ../dockerfile: NoticeSystem/Dockerfileports:- "3701:3500"volumes:   - ../NoticeSystem:/NoticeSystem      networks:- b2c-dapr      noticesystem1-dapr:image: "daprio/daprd:latest"command: [ "./daprd", "-app-id", "notice", "-app-port", "80","-placement-host-address", "placement:50006","-components-path","/components","-config","/home/nonroot/.dapr/config.yaml" ]depends_on:- noticesystem1network_mode: "service:noticesystem1"volumes:   - ../components:/components - ../:/home/nonroot/.dapr     #┌───────────────────────────────────┐#│ noticesystem2 app + Dapr sidecar  │#└───────────────────────────────────┘  noticesystem2:image: ${DOCKER_REGISTRY-}noticesystemdepends_on:- redis- placement    - rabbitmq  - zipkin         build:context: ../dockerfile: NoticeSystem/Dockerfileports:- "3702:3500"volumes:   - ../NoticeSystem:/NoticeSystem      networks:- b2c-dapr      noticesystem2-dapr:image: "daprio/daprd:latest"command: [ "./daprd", "-app-id", "notice", "-app-port", "80","-placement-host-address", "placement:50006","-components-path","/components" ,"-config","/home/nonroot/.dapr/config.yaml"]depends_on:- noticesystem2network_mode: "service:noticesystem2"volumes:   - ../components:/components - ../:/home/nonroot/.dapr     #┌────────────────────────┐#│ Dapr placement service │#└────────────────────────┘  placement:image: "daprio/dapr"command: ["./placement", "-port", "50006"]ports:- "50006:50006"networks:- b2c-dapr#┌──────────────────────────┐#│ Zipkin  service          │#└──────────────────────────┘ zipkin:image: "openzipkin/zipkin"ports:- "9411:9411"networks:- b2c-dapr#┌───────────────────┐#│ Redis state store │#└───────────────────┘  redis:image: "redis:latest"ports:- "6379:6379"networks:- b2c-dapr#┌──────────────────────┐#│ RabbitMQ             │#└──────────────────────┘  rabbitmq:image: "rabbitmq:management"ports:- "15672:15672"- "5672:5672" environment:- RABBITMQ_DEFAULT_USER=admin- RABBITMQ_DEFAULT_PASS=!2021que networks:- b2c-dapr  networks:b2c-dapr:

config.yaml，指定了tracing的配置，zipkin的地址是：http://zipkin:9411/api/v2/spans

apiVersion: dapr.io/v1alpha1
kind: Configuration
metadata:name: daprConfig
spec:tracing:samplingRate: "1"zipkin:endpointAddress: http://zipkin:9411/api/v2/spans

这是一个调用的跟踪结果（一）

这是一个调用的跟踪结果（二）

这是一个调用的跟踪结果（三）

这是一个发布订阅的跟踪结果（一）

这是一个发布订阅的跟踪结果（一）