Automatically renew Letsencrypt certificate with Certbot
https://certbot.eff.org/lets-encrypt/ubuntuxenial-apache Generate wildcard certificate
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$ sudo certbot certonly --manual --preferred-challenges=dns --email yourname@yourdomain.com --server https://acme-v02.api.letsencrypt.org/directory --agree-tos -d *.yourdomain.com |