You can use Let's Encrypt DNS validation to get certificates for servers even if they're not accessible over the internet (for example, for internal servers or local development). Certbot and acme.sh both support this and integrate with various DNS APIs to handle the validation, or you could manually set the required TXT record.
I use acme-dns to handle the validation, but it takes a bit of setup.
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You can use Let's Encrypt DNS validation to get certificates for servers even if they're not accessible over the internet (for example, for internal servers or local development). Certbot and acme.sh both support this and integrate with various DNS APIs to handle the validation, or you could manually set the required TXT record.
I use acme-dns to handle the validation, but it takes a bit of setup.