You can use a dns challenge for v1 "regular" certs - there's no requirement for a web server, in order to use let's encrypt. See eg point 4: 0https://github.co

You can use a dns challenge for v1 "regular" certs - there's no requirement for a web server, in order to use let's encrypt. See eg point 4: 0https://github.com/Neilpang/acme.sh/wiki/How-to-issue-a-cert https://github.com/Neilpang/acme.sh/wiki/How-to-issue-a-cert