istio-jaeger部署

istio-jaeger部署 一 简介

Jaeger 是Uber推出的一款开源分布式追踪系统，兼容OpenTracing API。分布式追踪系统用于记录请求范围内的信息，包括一次调用的服务链路以及每个服务的延时，能够帮助我们很好的分析微服务间链路调用的错误及瓶颈。
OpenTracing api 及其原理将在下一篇 blog 中介绍。由于 istio 默认支持 Jaeger，因此准备测试下 Jaeger与Istio的集成。
Jaeger 整体架构如下图，主要包括3个组件： agent，collector以及query(UI)

agent: 用于监听应用传来的链路信息，并传递给collector，
collector：收集链路信息，并持久化。 其支持的后端存储为 Cassandra、ElasticSearch。此外也支持对接 Kafka，以进行后续的流式处理（可连入 spark、flink 以进一步分析）
query：提供查询的 api 接口及 UI 界面

在 istio 中，我们可以不部署 agent 组件。因为在 istio 中，若在 mixer 组件配置 zipkin-address-url 参数，则会默认为服务网格中的服务创建调用链路信息，并发送到配置的地址中。
这里的zipkin-address-url 并非真正部署的 zipkin， 而是这个地址可以兼容 zipkin 所使用的数据格式。

二 部署

1.all-in-one
由于 all-in-one 模式是用于测试的demo，因此所有的链路信息默认存储在内存中，无法用于生产环境。
若单独在 K8s 平台中， Jaeger 官方推荐使用 Jaeger Operator 部署。Operator 部署相对来说比较简单，参考连接https://www.jaegertracing.io/docs/1.14/operator/，此处不再赘述。

Operator 是 K8s 平台提供的一种可自定义 Controller 的方式，此外仍需定义一系列的 CRD，自定义 Operator通过监听 CRD 的状态更新，实现一系列的逻辑，比如创建 deployment 等。

2.生产环境部署

zipkin:
  address: zipkin.istio-system:9411

#jaeger-cm.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: jaeger-configuration
  namespace: istio-system
  labels:
    app: jaeger
    app.kubernetes.io/name: jaeger
data:
  span-storage-type: elasticsearch
  collector: |
    es:
      server-urls: http://es-ip:9200
    collector:
      zipkin:
        http-port: 9411
  query: |
    es:
      server-urls: http://es-ip:9200
  agent: |
    collector:
      host-port: "jaeger-collector:14267"

#ingress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    ingress.kubernetes.io/protocol: http
  name: istio-jaeger
  namespace: istio-system
spec:
  rules:
  - host: domain
    http:
      paths:
      - backend:
          service:
            name: jaeger-query
            port:
              name: jaeger-query
        path: /
        pathType: ImplementationSpecific

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: jaeger-collector
  namespace: istio-system
  labels:
    app: jaeger
    app.kubernetes.io/name: jaeger
    app.kubernetes.io/component: collector
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: jaeger
      app.kubernetes.io/component: collector
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: jaeger
        app.kubernetes.io/name: jaeger
        app.kubernetes.io/component: collector
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "14268"
    spec:
      containers:
      - image: jaegertracing/jaeger-collector:1.23.0
        name: jaeger-collector
        args: ["--config-file=/conf/collector.yaml"]
        ports:
        - containerPort: 14267
          protocol: TCP
        - containerPort: 14268
          protocol: TCP
        - containerPort: 9411
          protocol: TCP
        readinessProbe:
          httpGet:
            path: "/"
            port: 14269
        volumeMounts:
        - name: jaeger-configuration-volume
          mountPath: /conf
        env:
        - name: SPAN_STORAGE_TYPE
          valueFrom:
            configMapKeyRef:
              name: jaeger-configuration
              key: span-storage-type
      volumes:
        - configMap:
            name: jaeger-configuration
            items:
              - key: collector
                path: collector.yaml
          name: jaeger-configuration-volume
---
apiVersion: v1
kind: Service
metadata:
  name: jaeger-collector
  namespace: istio-system
  labels:
    app: jaeger
    app.kubernetes.io/name: jaeger
    app.kubernetes.io/component: collector
spec:
  ports:
  - name: jaeger-collector-tchannel
    port: 14267
    protocol: TCP
    targetPort: 14267
  - name: jaeger-collector-http
    port: 14268
    protocol: TCP
    targetPort: 14268
  - name: jaeger-collector-zipkin
    port: 9411
    protocol: TCP
    targetPort: 9411
  selector:
    app.kubernetes.io/name: jaeger
    app.kubernetes.io/component: collector
  type: ClusterIP
---
apiVersion: v1
kind: Service
metadata:
  name: zipkin
  namespace: istio-system
  labels:
    app: jaeger
    app.kubernetes.io/name: jaeger
    app.kubernetes.io/component: zipkin
spec:
  ports:
  - name: jaeger-collector-zipkin
    port: 9411
    protocol: TCP
    targetPort: 9411
  selector:
    app.kubernetes.io/name: jaeger
    app.kubernetes.io/component: collector
  type: ClusterIP
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: jaeger-query
  namespace: istio-system
  labels:
    app: jaeger
    app.kubernetes.io/name: jaeger
    app.kubernetes.io/component: query
spec:
  replicas: 1
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app.kubernetes.io/name: jaeger
      app.kubernetes.io/component: query
  template:
    metadata:
      labels:
        app: jaeger
        app.kubernetes.io/name: jaeger
        app.kubernetes.io/component: query
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "16686"
    spec:
      containers:
      - image: jaegertracing/jaeger-query:1.23.0
        name: jaeger-query
        args: ["--config-file=/conf/query.yaml"]
        ports:
        - containerPort: 16686
          protocol: TCP
        readinessProbe:
          httpGet:
            path: "/"
            port: 16687
        volumeMounts:
        - name: jaeger-configuration-volume
          mountPath: /conf
        env:
        - name: SPAN_STORAGE_TYPE
          valueFrom:
            configMapKeyRef:
              name: jaeger-configuration
              key: span-storage-type
      volumes:
        - configMap:
            name: jaeger-configuration
            items:
              - key: query
                path: query.yaml
          name: jaeger-configuration-volume
---
apiVersion: v1
kind: Service
metadata:
  name: jaeger-query
  namespace: istio-system
  labels:
    app: jaeger
    app.kubernetes.io/name: jaeger
    app.kubernetes.io/component: query
spec:
  ports:
  - name: jaeger-query
    port: 80
    protocol: TCP
    targetPort: 16686
  selector:
    app.kubernetes.io/name: jaeger
    app.kubernetes.io/component: query
---