Envoy路由标头匹配

# HTTP Route Headers Match Demo

### 环境说明
#### 六个Service:

- envoy：Front Proxy,地址为172.31.52.10
- 5个后端服务
  - demoapp-v1.0-1和demoapp-v1.0-2：对应于Envoy中的demoappv10集群
  - demoapp-v1.1-1和demoapp-v1.1-2：对应于Envoy中的demoappv11集群
  - demoapp-v1.2-1：对应于Envoy中的demoappv12集群

#### 使用的路由配置

```
            virtual_hosts:
            - name: vh_001
              domains: ["*"]
              routes:
              - match:
                  prefix: "/"
                  headers:
                  - name: X-Canary
                    exact_match: "true"
                route:
                  cluster: demoappv12
              - match:
                  prefix: "/"
                  query_parameters:
                  - name: "username"
                    string_match:
                      prefix: "vip_"
                route:
                  cluster: demoappv11
              - match:
                  prefix: "/"
                route:
                  cluster: demoappv10

启动

cd servicemesh_in_practise/HTTP-Connection-Manager/httproute-headers-match
docker-compose up

[root@k8s-master httproute-headers-match]# cat docker-compose.yaml 
version: '3'

services:
  front-envoy:
    image: envoyproxy/envoy-alpine:v1.21-latest
    environment:
      - ENVOY_UID=0
      - ENVOY_GID=0
    volumes:
      - ./front-envoy.yaml:/etc/envoy/envoy.yaml
    networks:
      envoymesh:
        ipv4_address: 172.31.52.10
    expose:
      # Expose ports 80 (for general traffic) and 9901 (for the admin server)
      - "80"
      - "9901"

  demoapp-v1.0-1:
    image: ikubernetes/demoapp:v1.0
    hostname: demoapp-v1.0-1
    networks:
      envoymesh:
        aliases:
          - demoappv10
    expose:
      - "80"      
      
  demoapp-v1.0-2:
    image: ikubernetes/demoapp:v1.0
    hostname: demoapp-v1.0-2
    networks:
      envoymesh:
        aliases:
          - demoappv10
    expose:
      - "80"  

  demoapp-v1.1-1:
    image: ikubernetes/demoapp:v1.1
    hostname: demoapp-v1.1-1
    networks:
      envoymesh:
        aliases:
          - demoappv11
    expose:
      - "80"      
      
  demoapp-v1.1-2:
    image: ikubernetes/demoapp:v1.1
    hostname: demoapp-v1.1-2
    networks:
      envoymesh:
        aliases:
          - demoappv11
    expose:
      - "80"  
      
  demoapp-v1.2-1:
    image: ikubernetes/demoapp:v1.2
    hostname: demoapp-v1.2-1
    networks:
      envoymesh:
        aliases:
          - demoappv12
    expose:
      - "80"     

networks:
  envoymesh:
    driver: bridge
    ipam:
      config:
        - subnet: 172.31.52.0/24
[root@k8s-master httproute-headers-match]# cat front-envoy.yaml 
admin:
  profile_path: /tmp/envoy.prof
  access_log_path: /tmp/admin_access.log
  address:
    socket_address:
       address: 0.0.0.0
       port_value: 9901

static_resources:
  listeners:
  - name: listener_0
    address:
      socket_address: { address: 0.0.0.0, port_value: 80 }
    filter_chains:
    - filters:
      - name: envoy.filters.network.http_connection_manager
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
          stat_prefix: ingress_http
          codec_type: AUTO
          route_config:
            name: local_route
            virtual_hosts:
            - name: vh_001
              domains: ["*"]
              routes:
              - match:
                  prefix: "/"
                  headers:
                  - name: X-Canary
                    exact_match: "true"
                route:
                  cluster: demoappv12
              - match:
                  prefix: "/"
                  query_parameters:
                  - name: "username"
                    string_match:
                      prefix: "vip_"
                route:
                  cluster: demoappv11
              - match:
                  prefix: "/"
                route:
                  cluster: demoappv10
          http_filters:
          - name: envoy.filters.http.router

  clusters:
  - name: demoappv10
    connect_timeout: 0.25s
    type: STRICT_DNS
    lb_policy: ROUND_ROBIN
    load_assignment:
      cluster_name: demoappv10
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: demoappv10
                port_value: 80

  - name: demoappv11
    connect_timeout: 0.25s
    type: STRICT_DNS
    lb_policy: ROUND_ROBIN
    load_assignment:
      cluster_name: demoappv11
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: demoappv11
                port_value: 80

  - name: demoappv12
    connect_timeout: 0.25s
    type: STRICT_DNS
    lb_policy: ROUND_ROBIN
    load_assignment:
      cluster_name: demoappv12
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: demoappv12
                port_value: 80

发起无附加条件的请求

curl 172.31.52.10/hostname

测试使用“X-Canary: true”村头的请求

curl -H "X-Canary: true" 172.31.52.10/hostname 

测试使用特定的查询条件

curl 172.31.52.10/hostname?username=vip_mageedu

curl 172.31.52.10/hostname?username=vip_ilinux