使用skipper 扩展fabio 的路由&&http proxy 功能

skipper 具有强大的http 路由功能，fabio 是一个方便的基于consul 的负载均衡软件，
我们可以方便的使用skipper 路由功能进行fabio的扩展,使用registrator 进行服务注册

环境准备

• docker-compose

version: "3"
services:
  fabio:
    image: fabiolb/fabio
    ports:
    - "9999:9999"
    - "9998:9998"
    volumes:
    - "./fabio.properties:/etc/fabio/fabio.properties"
  consul:
    image: consul
    command: agent -config-file=/usr/local/etc/consul/server_agent.json
    volumes:
    - "./consul.json://usr/local/etc/consul/server_agent.json"
    ports:
    - "8500:8500"
  web:
    image: nginx
    ports:
    - "80:80"
    environment:
    - SERVICE_TAGS=urlprefix-/
    - SERVICE_80_CHECK_HTTP=/
    - SERVICE_80_NAME=web-app
    - SERVICE_CHECK_INTERVAL=10s
    - SERVICE_CHECK_TIMEOUT=5s
  ip:
    build: 
      context: ./
      dockerfile: Dockerfile-ip
    image: dalongrong/openresty-ip
  skipper2:
    image: dalongrong/skipper
    environment:
    - SERVICE_TAGS=urlprefix-/ip
    - SERVICE_9090_NAME=skipper
    - SERVICE_9090_CHECK_HTTP=/
    - SERVICE_CHECK_INTERVAL=10s
    - SERVICE_CHECK_TIMEOUT=5s
    ports:
    - "9090:9090"
    volumes:
    - "./router.eskip:/router.eskip"
    command: skipper -enable-ratelimits -enable-prometheus-metrics -routes-file /router.eskip
  registor:
    image: gliderlabs/registrator:latest
    command: consul://consul:8500
    volumes:
    - "/var/run/docker.sock:/tmp/docker.sock"

• 说明
  对于skipper 的扩展使用的是nginx 重写，同时注册skipper到fabio中
  ip 服务的dockerfile && nginx 配置
  Dockerfile-ip

FROM openresty/openresty:alpine
COPY nginx.conf usr/local/openresty/nginx/conf/
EXPOSE 80

nginx.conf

worker_processes 1;
events {
    worker_connections 1024;
}
http {
    include mime.types;
    default_type application/octet-stream;
    sendfile on;
    keepalive_timeout 65;
    gzip on;
    real_ip_header X-Forwarded-For;
    real_ip_recursive on;
    server {
        listen 80;
        server_name localhost;
        charset utf-8;
        location / {
            rewrite ^/ip(.*) $1 break;
            proxy_ignore_client_abort on;
            client_body_buffer_size 10M;
            client_max_body_size 10G;
            proxy_buffers 1024 4k;
            proxy_read_timeout 300;
            proxy_pass http://localhost:88;
         }
        location /alert {
         default_type text/html;
         content_by_lua_block{
             ngx.say([[<script>alert("error")</script>]])
         }
        }

        location /ip2 {
            default_type text/html;
            content_by_lua_block{
                ngx.say(ngx.var.remote_addr)
            }
        }
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
            root html;
        }
    }
    server {
        listen 88;
        server_name localhost;
        charset utf-8;
        location / {
              index index.html index.htm;
         }
        location /alert {
         default_type text/html;
         content_by_lua_block{
             ngx.say([[<script>alert("error")</script>]])
         }
        }

        location /ip2 {
            default_type text/html;
            content_by_lua_block{
                ngx.say(ngx.var.remote_addr.."from upstream")
            }
        }
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
            root html;
        }
    }
}

• fabio 配置文件
  fabio.properties

registry.consul.addr = consul:8500

• skipper router 配置

hello: Path("/ip/*")->compress("text/html")-> corsOrigin()->setResponseHeader("TOKEN","dalongdemo")->responseCookie("test-session", "abc", 31536000)->
 setRequestHeader("TOKEN","dalongdemo")-> "http://ip";
root: Path("/") -> status(200) -> <shunt>;

启动&&测试

• 启动

docker-compose up -d

• consul 效果
  
• fabio router 注册
  
• 访问
  http://localhost:9999 // web nginx index page
  
  http://localhost:9999/ip/index.html skipper 后端的openresty 服务
  
  skipper 添加的header
  
  http://localhost:9999/ip/ip2 skipper 后端路由接口
  

参考资料

https://github.com/rongfengliang/fabio-with-skipper
https://gliderlabs.github.io/registrator/latest/
https://github.com/fabiolb/fabio
https://github.com/zalando/skipper