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Articles with the cname tag

ANAME、CNAME、DNAME

CNAME 很常见,一般人都很熟悉,将一个域名映射到另外一个域名。但是CNAME 有个限制,顶级域名(apex domain)不建议设置CNAME,因为会和MX 记录冲突,详细解释:为什么裸域名不可以设置 CNAME?#26

RFC1912:2.4 CNAME records

A CNAME record is not allowed to coexist with any other data. In other words, if suzy.podunk.xx is an alias for sue.podunk.xx, you can't also have an MX record for suzy.podunk.edu, or an A record, or even a TXT record...

所以就诞生了ANAME,有些DNS 服务商叫做ALIAS,可以在apex domain 上实现类似CNAME 效果。第一次见到这个,是在配置Github Pages

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