I need to set up Let’s Encrypt for a website whose domain name is an ALIAS of the hostname where it runs. Both https://mywebsitename.com and https://myhostname.com need to work. For the hostname, Certbot should work, since it’s an A record. Will it work for the website name, which is an ALIAS, or does its DNS record need to be changed to an A record?
If I'm reading this blog post correctly, ALIAS is a DNSimple-specific thing. This is similar to what Cloudflare calls CNAME flattening. From the point-of-view of a DNS resolver, it's just another A record:
Externally, the ALIAS record behaves like an A record returning one or more A records matching the alias target. [...]
So yeah, this should work.
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There is no ALIAS record: http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml
I don’t know why they confuse people by using a common semantic for a made-up thing.
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