在整个生命周期中跟踪请求……通过 Docker 容器？ Traefik：入口控制器Jaeger：开放追踪/开放遥测

编程问答 2022-05-27

问题描述

跟踪使查找代码中的部分变得更加容易，值得开发人员花费时间和精力。出于这个原因，我将 Jaeger 作为跟踪器附加到 Docker 容器内的一组微服务。我使用 Traefik 作为入口控制器/服务网格来路由和代理请求。

我面临的问题是，Traefik 中的 tracing 配置有问题。 Jaeger 无法找到将单个/服务相关跨度连接到整个跟踪的跨度上下文。

日志中出现以下行：

{
  "level":"debug","middlewareName":"tracing","middlewareType":"TracingEntryPoint","msg":"Failed to extract the context: opentracing: SpanContext not found in Extract carrier","time":"2021-02-02T23:16:51+01:00"
}
到目前为止我尝试/搜索/确认的内容：
  • 我已经检查了端口（它们在 Docker 主机网络内打开）并且一切都可以访问。所以互连性不是这里的问题。
  • 标头的转发是通过 Docker Compose labels: loadbalancer.passhostheader=true 设置的。

以下片段描述了 Docker Compose 设置。

Traefik：入口控制器

这是一个精简版的 traefik 容器。

# Network
ROOT_DOMAIN=example.test
DEFAULT_NETWORK=traefik

---
version: '3'
services:
    image: "traefik:2.4.2"
    hostname: "controller"
    restart: on-failure
    security_opt:
      - no-new-privileges:true
    ports:
      - "443:443"
      - "80:80"
      # The Web UI (enabled by --api.insecure=true)
      - "8080:8080"
      - "8082:8082"
      - "8083:8083"
    networks:
      - default
    working_dir: /etc/traefik
    volumes:
      - /private/etc/localtime:/etc/localtime:ro
      - ${PWD}/controller/static.yml:/etc/traefik/traefik.yml:ro
      - ${PWD}/controller/dynamic.yml:/etc/traefik/dynamic.yml:ro
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - cert-storage:/usr/local/share/ca-certificates:ro
      - ${PWD}/logs/traefik:/var/log/traefik

volumes:
  cert-storage:
    driver_opts:
      type: none
      o: bind
      device: ${PWD}/certs/certs

networks:
  default:
    external: true
    name: ${DEFAULT_NETWORK}

Traefik 是使用 file provider 作为基础和 Docker Compose 标签来设置的：

# static.yaml (Traefik conf)
debug: true

log:
  level: DEBUG
  filePath: /var/log/traefik/error.log
  format: json

serversTransport:
  insecureSkipVerify: true

api:
  dashboard: true
  insecure: true
  debug: true

providers:
  docker:
    exposedByDefault: false
    swarmMode: false
    watch: true
    defaultRule: "Host(`{{ normalize .Name }}.example.test`)"
    endpoint: "unix:///var/run/docker.sock"
    network: traefik
  file:
    filename: /etc/traefik/dynamic.yml
    watch: true

tracing:
  serviceName: "controller"
  spanNameLimit: 250
  jaeger:
    samplingType: const
    samplingParam: 1.0
    samplingServerURL: http://tracer:5778/sampling
    localAgentHostPort: 127.0.0.1:6831
    gen128Bit: true
    propagation: jaeger
    traceContextHeaderName: "traefik-trace-id"
    collector:
      endpoint: http://tracer:14268/api/traces?format=jaeger.thrift

Jaeger：开放追踪/开放遥测

---
version: '3'
services:
  tracer:
    image: "jaegertracing/all-in-one:1.21.0"
    hostname: "tracer"
    command:
      - "--log-level=info"
      - "--admin.http.host-port=:14269"
      - "--query.ui-config=/usr/local/share/jaeger/ui/conf.json"
    environment:
      SPAN_STORAGE_TYPE: memory
    restart: on-failure
    security_opt:
      - no-new-privileges:true
    expose:
      - 5775/udp
      - 6831/udp
      - 6832/udp
      - 5778
      - 14250
      - 14268
      - 14269
      - 14271
      - 16686
      - 16687
    volumes:
      - /private/etc/localtime:/etc/localtime:ro
      - ${PWD}/tracer/conf:/usr/local/share/jaeger
      - ${PWD}/logs/jaeger:/var/log/@TODO
      - cert-storage:/usr/local/share/ca-certificates
    networks:
      - default
    labels:
      - "traefik.enable=true"
      - "traefik.docker.network=${DEFAULT_NETWORK}"
      # Admin UI router
      - "traefik.http.routers.tracer-router.rule=Host(`tracer.$ROOT_DOMAIN`)"
      - "traefik.http.routers.tracer-router.entrypoints=https"
      - "traefik.http.routers.tracer-router.tls=true"
      - "traefik.http.routers.tracer-router.tls.options=default"
      - "traefik.http.routers.tracer-router.service=tracer"
      # Service/ Load Balancer
      - "traefik.http.services.tracer.loadbalancer.passhostheader=true"
      - "traefik.http.services.tracer.loadbalancer.server.port=16686"
      - "traefik.http.services.tracer.loadbalancer.server.scheme=http"

解决方法

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dockerdocker-composejaegertraefiktraefik-ingress