环境说明

envoy：Front Proxy, 地址为 172.31.1.2

webserver01：后端服务，地址为 172.31.1.11

webserver01：后端服务，地址为 172.31.1.12

envoy配置文件

static_resources:
  listeners:
    name: listener_0
    address:
      socket_address: { address: 0.0.0.0, port_value: 80 }
    filter_chains:
    - filters:
      - name: envoy.tcp_proxy
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy
          stat_prefix: tcp
          cluster: local_cluster

  clusters:
  - name: local_cluster
    connect_timeout: 0.25s
    type: STATIC
    lb_policy: ROUND_ROBIN
    load_assignment:
      cluster_name: local_cluster
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address: { address: 172.31.1.11, port_value: 8080 }
        - endpoint:
            address:
              socket_address: { address: 172.31.1.12, port_value: 8080 }

docker-compose.yaml

version: '3.3'

services:
  envoy:
    image: envoyproxy/envoy:v1.23-latest
    volumes:
    - ./envoy.yaml:/etc/envoy/envoy.yaml
    environment:
      - ENVOY_UID=0
      - ENVOY_GID=0
    networks:
      envoymesh:
        ipv4_address: 172.31.1.2
        aliases:
        - front-proxy
    depends_on:
    - webserver01
    - webserver02

  webserver01:
    image: ikubernetes/demoapp:v1.0
    environment:
      - PORT=8080
    hostname: webserver01
    networks:
      envoymesh:
        ipv4_address: 172.31.1.11
        aliases:
        - webserver01

  webserver02:
    image: ikubernetes/demoapp:v1.0
    environment:
      - PORT=8080
    hostname: webserver02
    networks:
      envoymesh:
        ipv4_address: 172.31.1.12
        aliases:
        - webserver02

networks:
  envoymesh:
    driver: bridge
    ipam:
      config:
        - subnet: 172.31.1.0/24

运行envoy

docker-compose up -d

测试envoy

# docker-compose exec envoy bash
[email protected]:/# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
26: [email protected]: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:ac:1f:01:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.31.1.2/24 brd 172.31.1.255 scope global eth0
       valid_lft forever preferred_lft forever


[email protected]:/# netstat -tnlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 127.0.0.11:33257        0.0.0.0:*               LISTEN      -                   
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      1/envoy             
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      1/envoy             
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      1/envoy             
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      1/envoy    

[email protected]:/# curl http://172.31.1.2:80
iKubernetes demoapp v1.0 !! ClientIP: 172.31.1.2, ServerName: webserver01, ServerIP: 172.31.1.11!
[email protected]:/# curl http://172.31.1.2:80
iKubernetes demoapp v1.0 !! ClientIP: 172.31.1.2, ServerName: webserver02, ServerIP: 172.31.1.12!

清理envoy

docker-compose  down