DevOps Intermediate

Jaeger — Distributed Tracing System¶

JaegerTracingMicroservicesObservability 5 min read

Jaeger pro distribuované trasování. Architektura, deployment, sampling strategie a analýza latence.

Architecture Jaegeru¶

Jaeger je CNCF graduated projekt pro distribuované trasování.

• Agent — UDP listener na nodu, batchuje spany
• Collector — přijímá a validuje traces
• Query — API a UI pro dotazování
• Storage — Elasticsearch, Cassandra, nebo Kafka

Kubernetes Deployment¶

apiVersion: jaegertracing.io/v1
kind: Jaeger
metadata:
  name: production
spec:
  strategy: production
  collector:
    replicas: 3
    maxReplicas: 10
  storage:
    type: elasticsearch
    options:
      es:
        server-urls: https://elasticsearch:9200
        index-prefix: jaeger
    esIndexCleaner:
      enabled: true
      numberOfDays: 14
      schedule: "55 23 * * *"
  sampling:
    options:
      default_strategy:
        type: probabilistic
        param: 0.1

Sampling Strategie¶

• Constant — vše (1) nebo nic (0)
• Probabilistic — procento requestů (0.1 = 10%)
• Rate Limiting — max N traces za sekundu
• Adaptive — automaticky adjustuje per-endpoint

Summary¶

Jaeger je battle-tested řešení pro distributed tracing. Adaptive sampling a flexibilní storage backend ho činí vhodným pro enterprise nasazení.

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