If the Greenkeeper Enterprise service is already running, first stop it on the admin console.
ssh root@gke.my-company.com
apt-get install python-letsencrypt # assumes Debian/Ubuntu, analogous for other package managers / OSs
export DOMAIN=my-company.com # assumes sh/bash
letsencrypt certonly --standalone --email me@$DOMAIN --agree-tos --keep -d gke.$DOMAIN -d api.$DOMAIN -d kue.$DOMAIN # optional: -d couchdb.$DOMAIN
cp /etc/letsencrypt/live/$DOMAIN*/fullchain.pem /data/certs/$DOMAIN.crt
cp /etc/letsencrypt/live/$DOMAIN*/privkey.pem /data/certs/$DOMAIN.key
Now (re-) start the Greenkeeper Enterprise serices in the admin console. If you are just going through the initial setup, the service will be started in a later steo