Note to self following a quick setup on a development box….

Setup:

apt-get install git
git clone https://github.com/letsencrypt/letsencrypt /opt/letsencrypt
cd /opt/letsencrypt
./letsencrypt-auto --apache -d example.com -d www.example.com --email admin@example.com --agree-tos

To renew:

/opt/letsencrypt/letsencrypt-auto renew

Quick cron hack for renewals:

echo "/opt/letsencrypt/letsencrypt-auto renew" >> /etc/cron.daily/letsencrypt-cron.sh
chmod +x /etc/cron.daily/letsencrypt-cron.sh

Test with:

/etc/cron.daily/letsencrypt-cron.sh

Thanks to Adam for the head start: https://www.adamcouch.co.uk/2016/02/20/lets-encrypt/
More here: https://letsencrypt.org/