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https://blog.toright.com/posts/5687/%e5%88%a9%e7%94%a8-etcd-confd-haproxy-%e5%af%a6%e7%8f%be%e6%9c%8d%e5%8b%99%e5%8b%95%e6%85%8b%e6%8b%93%e5%b1%95.html
利用 Etcd + Confd + HAProxy 實現服務動態拓展