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

Basic Configuration

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

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

• Istio Traffic Mirroring