Rancher test environment for Leonidas

This is a simple Ansible environment for trying out Rancher.

Note about LetsEncrypt SSL certificates

When setting up a Rancher server from this repository first time, the letsencrypt deployment needs to be done in three steps (enable letsencrypt support in vhost, create certs, enable ssl) because there is a chicken-egg problem:

1. start with fooapp_ssl: false and fooapp_letsencrypt: false, make sure everything works over HTTP
2. flip fooapp_letsencrypt: true, do not touch fooapp_ssl yet. Run the fooapp role, make sure nginx is restarted.
3. add a certificate for fooapp to the letsencrypt role, run the letsencrypt role
4. now you can flip fooapp_ssl: true and run the fooapp rule, make sure everything works over HTTPS

Manual steps

Rancher gives a good copy-pasteable command for adding nodes,

Next steps (TODO)

For the test

• Figure out how SSL certificates and load balancers work under Rancher
• Try running some actual app like Jenkins
• How does one access container logs?

For production

• Setup an external database (MySQL)
• Evaluate Cattle, Kubernetes, Mesos and Swarm modes and select multi-node deployment strategy