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Re:Show HN: Mkcert – Valid HTTPS certificates for localhost by 713233eb on Monday January 07, 2019 @02:11PM (#18848828)
Using the DNS challenge with LE, you can create a wildcard cert that is valid for *.domain.tld. Now you need a simple local DNS server like PiHole to resolve any local domains to your local reverse proxy serving local sites with the wildcard cert and you're done. You only need internet connection on the user's browser to get the little green lock and when you generate the wildcard cert itself.
Re:Show HN: Mkcert – Valid HTTPS certificates for localhost by Gorgor on Monday January 07, 2019 @04:02PM (#18850036)
If you do it this way, you have to copy your actual server’s private key to your local machine (or even machines if you’re using several), though. That possibly increases the chances of it getting compromised.

I’d prefer getting a separate certificate for local.domain.tld instead.

Please correct me if I have a misunderstanding.