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Certbot

Installation

See here.

Add certificate

This will request a certificate and install it onto all nginx sites that use these domains.

certbot --nginx -d example.com,www.example.com

List certificates

certbot certificates

Modify certificate domains

Run the same command with --cert-name to make sure cerbot won't request a new certificate.

certbot --nginx --cert-name $name -d example.com,www.example.com,newsubdomain.example.com

If certbot asks you, press e to expand or u to update the certificate.