目标：通过Docker的方式部署MySql和zipkin，实现zipkin调用mysql

解决方案：让需要链接的容器同属一个外部网络
第一步：定义容器mysql的docker-compose.yml文件，内容如下：

version: '2' services:   db:     image: hub.c.163.com/library/mysql:5.7     container_name: mysql     volumes:       - /Users/xiewanzhi/mysql_data:/var/lib/mysql     restart: always     environment:       MYSQL_ROOT_PASSWORD: 123456       MYSQL_DATABASE: testDB     ports:       # Port used for the Zipkin UI and HTTP Api       - 3306:3306     networks:        - default        - app_net networks:    app_net:      external: true

第二步：定义容器zipkin的docker-compose.yml文件，内容如下：

version: '2'  services:   # The zipkin process services the UI, and also exposes a POST endpoint that   # instrumentation can send trace data to. Scribe is disabled by default.   zipkin:     image: openzipkin/zipkin:2.4.4     container_name: zipkin     environment:       - STORAGE_TYPE=mysql       # Point the zipkin at the storage backend       - MYSQL_DB=zipkin       - MYSQL_USER=root       - MYSQL_PASS=123456       - MYSQL_HOST=mysql       - MYSQL_TCP_PORT=3306       # Uncomment to enable scribe       # - SCRIBE_ENABLED=true       # Uncomment to enable self-tracing       # - SELF_TRACING_ENABLED=true       # Uncomment to enable debug logging       # - JAVA_OPTS=-Dlogging.level.zipkin=DEBUG -Dlogging.level.zipkin2=DEBUG     ports:       # Port used for the Zipkin UI and HTTP Api       - 9411:9411       # Uncomment if you set SCRIBE_ENABLED=true       # - 9410:9410     networks:        - default        - app_net networks:    app_net:      external: true 

这里两个容器的定义里都使用了同一个外部网络 app_net ,因此，我们需要在启动这两个容器之前通过以下命令再创建外部网络：

docker network create app_net 

之后，通过 docker-compose up -d 命令启动这两个容器，然后执行 docker exec -it zipkin ping mysql,你将会看到如下的输出：

MacBook-Pro:docker-zipkin mymac$ docker exec -it zipkin ping mysql PING mysql (172.20.0.2): 56 data bytes 64 bytes from 172.20.0.2: seq=0 ttl=64 time=0.100 ms 64 bytes from 172.20.0.2: seq=1 ttl=64 time=0.149 ms 64 bytes from 172.20.0.2: seq=2 ttl=64 time=0.145 ms 64 bytes from 172.20.0.2: seq=3 ttl=64 time=0.143 ms 64 bytes from 172.20.0.2: seq=4 ttl=64 time=0.652 ms 64 bytes from 172.20.0.2: seq=5 ttl=64 time=0.128 ms 64 bytes from 172.20.0.2: seq=6 ttl=64 time=0.210 ms

证明这两个容器是成功链接了。

此时http://127.0.0.1:9411/zipkin/可以提供追踪服务了