apt-get install git
git clone https://github.com/letsencrypt/letsencrypt /opt/letsencrypt
cd /opt/letsencrypt
./letsencrypt-auto --apache -d example.com
./letsencrypt-auto --apache -d example.com -d www.example.com
./letsencrypt-auto renew
sudo crontab -e
30 2 * * 1 /opt/letsencrypt/letsencrypt-auto renew >> /var/log/le-renew.log
cd /opt/letsencrypt
sudo git pull