Envoy 作为公共互联网服务的代理答案

【问题标题】：Envoy as proxy to public internet servicesEnvoy 作为公共互联网服务的代理
【发布时间】：2021-12-01 12:28:59
【问题描述】：

如何将 Envoy 配置为公共 Internet 服务的代理，以便每条路径都可以路由到不同的服务？例如：

http://foo.example.com/service1/* -> http://somewhere.com/*
http://foo.example.com/service2/* -> http://somewhereelse.com/*

【问题讨论】：

标签： envoyproxy

【解决方案1】：

假设您的 envoy 代理可通过 http://foo.example.com 访问，您可以使用如下配置：

static_resources:
  listeners:
  - 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
          codec_type: AUTO
          stat_prefix: ingress_http
          route_config:
            name: local_route
            virtual_hosts:
            - name: backend
              domains:
              - "*"
              routes:
              - match:
                  prefix: "/service1"
                route:
                  prefix_rewrite: "/"
                  cluster: service1
                  auto_host_rewrite: true
              - match:
                  prefix: "/service2"
                route:
                  prefix_rewrite: "/"
                  cluster: service2
                  auto_host_rewrite: true
          http_filters:
          - name: envoy.filters.http.router
  clusters:
  - name: service1
    connect_timeout: 15s
    type: LOGICAL_DNS
    lb_policy: ROUND_ROBIN
    load_assignment:
      cluster_name: service1
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: somewhere.com
                port_value: 80
  - name: service2
    connect_timeout: 15s
    type: LOGICAL_DNS
    lb_policy: ROUND_ROBIN
    load_assignment:
      cluster_name: service2
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: somewhereelse.com
                port_value: 80

重要的部分是：

prefix_rewrite: "/" 将http://foo.example.com/service1/stuff 改写为http://somewhere.com/stuff（其实就是去掉/service1）
auto_host_rewrite: true 在转发过程中添加Host 标头（集群上游主机的主机名）

【讨论】：