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README.md

Let’s Encrypt DC/OS!

This is a sample Marathon app for encrypting your Marathon-lb HAProxy endpoints using Let’s Encrypt. With this, you can automatically generate and renew valid SSL certs with Marathon-lb.

Getting started

Clone (or manually copy) this repo, and modify the letsencrypt-dcos.json file to include:

  • The list of hostnames (must be FQDNs) for which you want to generate SSL certs (in HAPROXY_0_VHOST)
  • An admin email address for your certificate (in LETSENCRYPT_EMAIL)
  • The Marathon API endpoint (in MARATHON_URL)
  • The Marathon-lb app ID (in MARATHON_LB_ID)
  • Ensure you have at least 2 or more public agents in your DC/OS cluster, and that marathon-lb is scaled out to more than 1 public agent. Deploying this app requires this since it entails restarting marathon-lb.

Now launch the letsencrypt-dcos Marathon app:

$ dcos marathon app add letsencrypt-dcos.json

There are 2 test apps included, based on openresty, which you can use to test everything. Have a look in the test/ directory within the repo.

How does it work?

The app includes 2 scripts: run.sh and post_cert.py. The first script (run.sh) will generate the initial SSL cert and POST the cert to Marathon for Marathon-lb. It will then attempt to renew & update the cert every 24 hours. The post_cert.py script will compare the current cert in Marathon to the current live cert, and update it as necessary. post_cert.py is called after the initial cert is generated, and again every 24 hours after a renewal attempt.

A persistent volume called data is mounted inside the container at /etc/letsencrypt which contains the certificates and other generated state.

Limitations

  • You may only have up to 100 domains per cert.
  • Let’s Encrypt currently has rate limits, such as issuing a maximum of 5 certs per set of domains per week.
  • Currently, when the cert is updated, it requires a full redeploy of Marathon-lb. This means there may be a few seconds of downtime as the deployment occurs. This can be mitigated by placing another LB (such as an ELB or F5) in front of HAProxy.