GeoDNS

說明

如果要做到類似 Cloudflare 分散式的 CDN 分流服務，除了需要 Reverse Proxy 服務以外，還要再搭配 GeoDNS 服務，這樣用戶在存取網站時，就能依照自己所屬的國家，使用連線最近的 Reverse Proxy，進而達到網站分流與加速網站存取速度。

本篇運用 Docker 技術就能在幾分鐘內完成佈署 GeoDNS 所有需要的元件，這樣就可以將時間用在設定網域上。

開始佈署

新增 docker-compose.yml

version: '2'

services:
  geodns:
    restart: always
    image: sameersbn/bind:9.10.3-20180127
    container_name: geodns
    ports:
     - "53:53/udp"
     - "53:53/tcp"
    environment:
     - ROOT_PASSWORD=yourpassword
     - WEBMIN_ENABLED=false
    volumes:
     - /docker_vol/geodns/data:/data

新增設定檔需要的目錄

mkdir  /docker_vol/geodns/data

新增並啟動服務 geodns

docker-compose up -d

完成

設定 DNS

編輯 /docker_vol/geodns/data/bind/etc/named.conf

...
 include "/etc/bind/named.conf.options";
include "/etc/bind/named.conf.local";
//include "/etc/bind/named.conf.default-zones";
...

註解第三行，並加上以下幾行

// GeoDNS Configuration
// The download link to the GeoIP.acl
// http://geoip.site/download/MaxMind/GeoIP.acl.gz
//
// acl file sepified the IP zones of countries.
include "/etc/bind/GeoIP.acl";  

// view settings for all countries
view "USA" {
  // The contents of this view will be presented to users
  // from the USA.
  match-clients { US; };
  zone "example.com" {
    // This is my zonefile with the US view.
    file "/etc/bind/zones/usa/example.com.db";
    type master;
  };
};

view "Taiwan" {
  // The contents of this view will be presented to users
  // from the Taiwan.  
  match-clients { TW; };
  zone "example.com" {
    file "/etc/bind/zones/taiwan/example.com.db";
    type master;
  };
};

view "Global" {
  // The contents of this view will be presented to users
  // outside the USA and Taiwan.
  zone "example.com" {
    // This is my zonefile with the default view.
    file "/etc/bind/zones/global/example.com.db";
    type master;
  };
}