docs: Document the alt CNAME approach
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README.md
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README.md
@ -72,6 +72,18 @@ _acme-challenge.cooldomain.rio. 3600 IN CNAME cooldomain.rio.pages.example
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This additionally requires your repository to have a file named `CNAME` that contains
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the domain to use (`cooldomain.rio` in this case).
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### Alternate CNAME Domains
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If there is a situation where you want to use a CNAME redirect on a (sub-) domain,
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where having a CNAME is not feasible, you can configure an "alternate CNAME".
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This is a special TXT record that contains the "CNAME" you want to specify.
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```
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; Example for Bind
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cooldomain.rio. 3600 IN A <IPv4 of rio>
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_rio-cname.cooldomain.rio. 3600 IN TXT "cname=user.pages.example.org"
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```
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### Repository Redirects
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If you have multiple repositories with pages (and you use a CNAME), you can additionally
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