一个域名是否可能有多个对应的IP地址? [英] Is it possible that one domain name has multiple corresponding IP addresses?

问题描述

例如，当我们连接到 www.example.com 时，首先我们尝试连接到 192.0.2.1.如果第一次尝试失败，那么我们尝试192.0.2.222.

For example, when we connect to www.example.com, at first we try to connect to 192.0.2.1. And if first try fails, then we try 192.0.2.222.

有可能吗?一个域名可以注册多个备份IP吗?

Is it possible? Can we register multiple backup IP addresses for one domain name?

推荐答案

这是循环 DNS.这是一个非常简单的负载平衡解决方案.通常 DNS 服务器会为每个传入的 DNS 请求轮换/混洗 DNS 记录.不幸的是，这不是故障转移的真正解决方案.如果其中一台服务器出现故障，一些访问者仍将被定向到该故障服务器.

This is round robin DNS. This is a quite simple solution for load balancing. Usually DNS servers rotate/shuffle the DNS records for each incoming DNS request. Unfortunately it's not a real solution for fail-over. If one of the servers fail, some visitors will still be directed to this failed server.

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