istio-traffic-management

Comprehensive guide to Istio traffic management for production service mesh deployments.

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name	istio-traffic-management
description	Comprehensive guide to Istio traffic management for production service mesh deployments.
type	skill
created	2026-02-27T00:00:00.000Z
domain	life-learning
category	career
risk	unknown
source	community
tags	["skill","life-learning","career","istio","traffic","management"]

Istio Traffic Management

Comprehensive guide to Istio traffic management for production service mesh deployments.

Do not use this skill when

The task is unrelated to istio traffic management
You need a different domain or tool outside this scope

Instructions

Clarify goals, constraints, and required inputs.
Apply relevant best practices and validate outcomes.
Provide actionable steps and verification.
If detailed examples are required, open resources/implementation-playbook.md.

Use this skill when

Configuring service-to-service routing
Implementing canary or blue-green deployments
Setting up circuit breakers and retries
Load balancing configuration
Traffic mirroring for testing
Fault injection for chaos engineering

Core Concepts

1. Traffic Management Resources

Resource	Purpose	Scope
VirtualService	Route traffic to destinations	Host-based
DestinationRule	Define policies after routing	Service-based
Gateway	Configure ingress/egress	Cluster edge
ServiceEntry	Add external services	Mesh-wide

2. Traffic Flow

Client → Gateway → VirtualService → DestinationRule → Service
                   (routing)        (policies)        (pods)

Templates

Template 1: Basic Routing

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: reviews-route
  namespace: bookinfo
spec:
  hosts:
    - reviews
  http:

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: my-service-canary
spec:
  hosts:
    - my-service
  http:
    - route:
        - destination:
            host: my-service
            subset: stable
          weight: 90
        - destination:
            host: my-service
            subset: canary
          weight: 10
---
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: my-service-dr
spec:
  host: my-service
  trafficPolicy:
    connectionPool:
      tcp:
        maxConnections: 100
      http:
        h2UpgradePolicy: UPGRADE
        http1MaxPendingRequests: 100
        http2MaxRequests: 1000
  subsets:
    - name: stable
      labels:
        version: stable
    - name: canary
      labels:
        version: canary

apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: circuit-breaker
spec:
  host: my-service
  trafficPolicy:
    connectionPool:
      tcp:
        maxConnections: 100
      http:
        http1MaxPendingRequests: 100
        http2MaxRequests: 1000
        maxRequestsPerConnection: 10
        maxRetries: 3
    outlierDetection:
      consecutive5xxErrors: 5
      interval: 30s
      baseEjectionTime: 30s
      maxEjectionPercent: 50
      minHealthPercent: 30

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: ratings-retry
spec:
  hosts:
    - ratings
  http:
    - route:
        - destination:
            host: ratings
      timeout: 10s
      retries:
        attempts: 3
        perTryTimeout: 3s
        retryOn: connect-failure,refused-stream,unavailable,cancelled,retriable-4xx,503
        retryRemoteLocalities: true

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: mirror-traffic
spec:
  hosts:
    - my-service
  http:
    - route:
        - destination:
            host: my-service
            subset: v1
      mirror:
        host: my-service
        subset: v2
      mirrorPercentage:
        value: 100.0

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: fault-injection
spec:
  hosts:
    - ratings
  http:
    - fault:
        delay:
          percentage:
            value: 10
          fixedDelay: 5s
        abort:
          percentage:
            value: 5
          httpStatus: 503
      route:
        - destination:
            host: ratings

apiVersion: networking.istio.io/v1beta1
kind: Gateway
metadata:
  name: my-gateway
spec:
  selector:
    istio: ingressgateway
  servers:
    - port:
        number: 443
        name: https
        protocol: HTTPS
      tls:
        mode: SIMPLE
        credentialName: my-tls-secret
      hosts:
        - "*.example.com"
---
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: my-vs
spec:
  hosts:
    - "api.example.com"
  gateways:
    - my-gateway
  http:
    - match:
        - uri:
            prefix: /api/v1
      route:
        - destination:
            host: api-service
            port:
              number: 8080

apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: load-balancing
spec:
  host: my-service
  trafficPolicy:
    loadBalancer:
      simple: ROUND_ROBIN  # or LEAST_CONN, RANDOM, PASSTHROUGH
---
# Consistent hashing for sticky sessions
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: sticky-sessions
spec:
  host: my-service
  trafficPolicy:
    loadBalancer:
      consistentHash:
        httpHeaderName: x-user-id
        # or: httpCookie, useSourceIp, httpQueryParameterName

# Check VirtualService configuration
istioctl analyze

# View effective routes
istioctl proxy-config routes deploy/my-app -o json

# Check endpoint discovery
istioctl proxy-config endpoints deploy/my-app

# Debug traffic
istioctl proxy-config log deploy/my-app --level debug