[centOS] [Ubuntu] let's encrypt

sudo apt-get update
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update
sudo apt-get install certbot
service nginx stop
certbot certonly --standalone --email your@email.com -d yourdomain.com

yum install -y epel-release
yum install -y certbot

ssl_certificate   /etc/letsencrypt/live/123456.cloud/fullchain.pem;
ssl_certificate_key  /etc/letsencrypt/live/123456.cloud/privkey.pem;