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Traffic Mirroring ​

Traffic Mirroring (or Shadow Traffic) is a technique that replicates production traffic in real-time to test new versions.

Table of Contents ​

  1. Traffic Mirroring Overview
  2. Basic Configuration
  3. Partial Mirroring
  4. Practical Examples
  5. Best Practices

Traffic Mirroring Overview ​

A client sends a request that Version 1 answers on the live path, while the same request is replicated to Version 2 in a shadow copy whose response is discarded and never reaches the client.

Basic Configuration ​

yaml
apiVersion: networking.istio.io/v1
kind: VirtualService
metadata:
  name: reviews-mirror
spec:
  hosts:
  - reviews
  http:
  - route:
    - destination:
        host: reviews
        subset: v1
      weight: 100
    mirror:
      host: reviews
      subset: v2
    mirrorPercentage:
      value: 100  # 100% mirroring

Partial Mirroring ​

yaml
apiVersion: networking.istio.io/v1
kind: VirtualService
metadata:
  name: reviews-partial-mirror
spec:
  hosts:
  - reviews
  http:
  - route:
    - destination:
        host: reviews
        subset: v1
    mirror:
      host: reviews
      subset: v2
    mirrorPercentage:
      value: 10  # Mirror only 10%

References ​