istio-traffic-management

1# Istio Traffic Management
2 
3Comprehensive guide to Istio traffic management for production service mesh deployments.
4 
5## When to Use This Skill
6 
7- Configuring service-to-service routing
8- Implementing canary or blue-green deployments
9- Setting up circuit breakers and retries
10- Load balancing configuration
11- Traffic mirroring for testing
12- Fault injection for chaos engineering
13 
14## Core Concepts
15 
16### 1. Traffic Management Resources
17 
18| Resource            | Purpose                       | Scope         |
19| ------------------- | ----------------------------- | ------------- |
20| **VirtualService**  | Route traffic to destinations | Host-based    |
21| **DestinationRule** | Define policies after routing | Service-based |
22| **Gateway**         | Configure ingress/egress      | Cluster edge  |
23| **ServiceEntry**    | Add external services         | Mesh-wide     |
24 
25### 2. Traffic Flow
26 
27```
28Client → Gateway → VirtualService → DestinationRule → Service
29                   (routing)        (policies)        (pods)
30```
31 
32## Templates
33 
34### Template 1: Basic Routing
35 
36```yaml
37apiVersion: networking.istio.io/v1beta1
38kind: VirtualService
39metadata:
40  name: reviews-route
41  namespace: bookinfo
42spec:
43  hosts:
44    - reviews
45  http:
46    - match:
47        - headers:
48            end-user:
49              exact: jason
50      route:
51        - destination:
52            host: reviews
53            subset: v2
54    - route:
55        - destination:
56            host: reviews
57            subset: v1
58---
59…