Let's Encrypt client.
- /etc/letsencrypt
- /var/lib/letsencrypt
- /var/www/acme-challenge
$ docker run -d \
--name letsencrypt \
-v /somehostdir/letsencrypt/etc/:/etc/letsencrypt/ \
-v /somehostdir/letsencrypt/var/:/var/lib/letsencrypt/ \
-v /somehostdir/letsencrypt/www/:/var/www/acme-challenge/ \
almeida/letsencrypt