SSL-сертификат Let’s Encrypt на Centos для Nginx
yum install git
cd /tmp; git clone https://github.com/certbot/certbot
cd certbot; chmod a+x ./certbot-auto
./certbot-auto certonly --webroot --agree-tos --email admin@site.ru -w /home/bitrix/www/public/ -d site.ru -d www.site.ru
ssl_certificate /etc/letsencrypt/live/site.ru/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/site.ru/privkey.pem;
service nginx reload
crontab -e
* 1 * * 1 /tmp/certbot/certbot-auto renew --quiet
service crond restart