Kubernetes NGINX Ingress Controller not picking up TLS Certificates

Question

I setup a new kubernetes cluster on GKE using the nginx-ingress controller. TLS is not working, it's using the fake certificates.

There is a lot of configuration detail so I made a repo - https://github.com/jobevers/test_ssl_ingress

In short the steps were

• create a new cluster without GKE's load balancer
• create a tls secret with my key and cert
• create an nginx-ingress deployment / pod
• create an ingress controller

The nginx-ingress config comes from https://zihao.me/post/cheap-out-google-container-engine-load-balancer/ (and looks very similar to a lot of the examples in the ingress-nginx repo).

My ingress.yaml is nearly identical to the example one

When I run curl, I get

$ curl -kv https://35.196.134.52
[...]
*    common name: Kubernetes Ingress Controller Fake Certificate (does not match '35.196.134.52')
[...]
*    issuer: O=Acme Co,CN=Kubernetes Ingress Controller Fake Certificate
[...]

which shows that I'm still using the default certificates.

How am I supposed to get it using mine?

---

Ingress definition

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: test-ssl-ingress
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  tls:
    - secretName: tls-secret
  rules:
  - http:
      paths:
      - path: /
        backend:
          serviceName: demo-echo-service
          servicePort: 80

---

Creating the secret:

kubectl create secret tls tls-secret --key tls/privkey.pem --cert tls/fullchain.pem

---

Debugging further, the certificate is being found and exist on the server:

$ kubectl -n kube-system exec -it $(kubectl -n kube-system get pods | grep ingress | head -1 | cut -f 1 -d " ") -- ls -1 /ingress-controller/ssl/
default-fake-certificate-full-chain.pem
default-fake-certificate.pem
default-tls-secret-full-chain.pem
default-tls-secret.pem

And, from the log, I see

kubectl -n kube-system log -f $(kubectl -n kube-system get pods | grep ingress | head -1 | cut -f 1 -d " ")
[...]
I1013 17:21:45.423998       6 queue.go:111] syncing default/test-ssl-ingress
I1013 17:21:45.424009       6 backend_ssl.go:40] starting syncing of secret default/tls-secret
I1013 17:21:45.424135       6 ssl.go:60] Creating temp file /ingress-controller/ssl/default-tls-secret.pem236555242 for Keypair: default-tls-secret.pem
I1013 17:21:45.424946       6 ssl.go:118] parsing ssl certificate extensions
I1013 17:21:45.743635       6 backend_ssl.go:102] found 'tls.crt' and 'tls.key', configuring default/tls-secret as a TLS Secret (CN: [...])
[...]

But, looking at the nginx.conf, its still using the fake certs:

$ kubectl -n kube-system exec -it $(kubectl -n kube-system get pods | grep ingress | head -1 | cut -f 1 -d " ") -- cat /etc/nginx/nginx.conf | grep ssl_cert
        ssl_certificate                         /ingress-controller/ssl/default-fake-certificate.pem;
        ssl_certificate_key                     /ingress-controller/ssl/default-fake-certificate.pem;

Answer 1

Turns out that the ingress definition needs to look like:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: test-ssl-ingress
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  tls:
    - hosts:
      - app.example.com
      secretName: tls-secret
  rules:
    - host: app.example.com
      http:
        paths:
        - path: /
          backend:
            serviceName: demo-echo-service
            servicePort: 80

The host entry under rules needs to match one of the hosts entries under tls.