THtheptip·Feb 22, 2017
Note one significant gotcha with this approach: the Ingress does TLS termination, so the hop from the Ingress to your pod is unencrypted.
That might be OK if 1) your data isn's sensitive or 2) you're running on your own metal (and so you control the network), but in GKE your nodes are on Google's SDN, and so you're sending your traffic across their DCs in the clear.
There are a couple of pieces of hard-to-find config required to achieve TLS-to-the-pod with Ingress:
1) You need to enable ssl-passthrough on your nginx ingress; this is a simple annotation: https://github.com/kubernetes/contrib/issues/1854. This will use nginx's streaming mode to route requests with SNI without terminating the TLS connection.
2) Now you'll need a way of getting your certs into the pod; kube-lego attaches the certs to the Ingress pod, which is not what you wan
Read the rest
t for TLS-to-the-pod. https://github.com/PalmStoneGames/kube-cert-manager/ lets you do this in an automated way, by creating k8s secrets containing the letsencrypt certs.
3) Your pods will need an SSL proxy to terminate the TLS connection. I use a modified version of https://github.com/GoogleCloudPlatform/nginx-ssl-proxy.
4) You'll want a way to dynamically create DNS entries; Mate is a good approach here. Note that once you enable automatic DNS names for your Services, then it becomes less important to share a single public IP using SNI. You can actually abandon the Ingress, and have Mate set up your generated DNS records to point to the Service's LoadBalancer IP.
(As an aside, if you stick with Nginx Ingress, you can connect it to the outside world using a Kubernetes loadbalancer, instead of having to use a Terraform LB; the (hard-to-find and fairly new) config flag for that is `publish-service` (https://github.com/kubernetes/ingress/blob/master/core/pkg/i...).