I have secured my www.domain.com, but I also want to secure the api.domain.com subdomain
How is this possible with a single letsencrypt domain?
Im running
Dokku DigitalOcean
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Let's Encrypt certificates are SAN certificates. It means you can bundle more than one domain/hostname in the same certificate.
The correct procedure depends on what tool/client you used to issue the certificate. Simply configure it with the domains you want.
Two important notes: the number of domains/hostnames is currently limited to 100. Moreover, while in public beta, Let's Encrypt limits the issuance to 5 certificates per domain. Therefore, if you reissue a certificate and/or issue a new one with multiple domains, you'll get closer to the limit.
Just beware of that. Be sure to read the rate-limit section here.
Simone Carletti
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