一，实现方式

通过ingress-nginx做转发

二，实验环境

• k8s集群一个
• nginx服务2个
• ingress vip为10.50.0.100
• node ip为 10.50.0.204

三，实现目标

当请求Header里面有特定字段，比如X-Gray=true时，访问到efg.jenly.cn,默认情况访问到abc.jenly.cn，abc对应服务nginx-web,efg对应服务nginx-web2

四，配置步骤

1. 启动2个Pod，分别是nginx-web和nginx-web2
2. 对应配置2个服务nginx-web-service,nginx-web-service2；其中nginx-web-service2为nodeport,假定端口号为30016，节点IP为
3. 创建 Service 指向目标 IP（使用 ClusterIP 类型）

apiVersion: v1
kind: Service
metadata:
  name: external-efg-proxy
  namespace: main
spec:
  type: ClusterIP
  ports:
  - port: 80
    targetPort: 30016
    protocol: TCP

4. 创建 Endpoints 指向具体的 IP

apiVersion: v1
kind: Endpoints
metadata:
  name: external-efg-proxy
  namespace: main
subsets:
- addresses:
  - ip: 10.50.2.204  # 替换为实际的 efg.jenly.cn 的 IP 地址
  ports:
  - port: 80
    protocol: TCP

5. 创建 Ingress 使用 canary 注解

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: abc-final-ingress
  namespace: main
  annotations:
    kubernetes.io/ingress.class: "nginx"
    
    # 使用 canary 注解根据请求头分流
    nginx.ingress.kubernetes.io/canary: "true"
    nginx.ingress.kubernetes.io/canary-by-header: "X-Saic-Hw-Cloud"
    nginx.ingress.kubernetes.io/canary-by-header-value: "true"
    
    # 改为 HTTP 协议
    nginx.ingress.kubernetes.io/backend-protocol: "HTTP"
    
    # 配置片段
    nginx.ingress.kubernetes.io/configuration-snippet: |
      # 重写路径到 /efg，保留参数
      rewrite ^/(.*)$ /efg$is_args$args break;
      
      # 代理配置
      proxy_set_header Host efg.jenly.cn;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      
spec:
  rules:
  - host: abc.jenly.cn
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: external-efg-proxy
            port:
              number: 80

五，验证

1. 验证不带header的请求

curl -v --resolve abc.jenly.cn:80:10.50.0.100 http://abc.jenly.cn/index.html?test=Jenly

2. 查看nginx-web访问日志
   

3. 验证带header的请求

curl -v --resolve abc.jenly.cn:80:10.50.0.100 http://abc.jenly.cn/index.html?test=Jenly -H "X-Gray: true"

4. 查看nginx-web2访问日志