This one seams more daunting than it really is. A few steps and you’re good to go.
- Edit /etc/nginx.conf.d/site_name.conf
- Add new sub domain server to list following examples from previous entries
- Run Certbot in dry run to find any errors
- certbot renew –dry-run
- Should pass, may return cert not up for renewal
- Run Certbot to expand
- certbot –expand
- select all domains
- tip – leave selection blank to select all
- select all domains
- certbot –expand
- Done