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https://sandeep.hashnode.com/post/how-we-generate-and-renew-ssl-certs-for-arbitrary-custom-domains-using-letsencrypt-cjtk0utui000c1cs1f7y9ua5n#cjtk2svld00201ds190lsk7fu
sivaram's answer to How we generate and renew SSL certs for arbitrary custom domains using LetsEncrypt!