How do I present letsencrypt certificates to Kubernetes nginx (GKE)?

Question

I am learning the Google Cloud platform, trying to implement my first project and am getting lost in the tutorials. I am stuck at the trying to implement an nginx ingress. My ingress is stuck in CrashLoopBackoff and the logs show the following error.

I know how to do this task with DockerCompose, but not here.

Where do I start?

1#1: cannot load certificate "/etc/letsencrypt/live/blah.com/fullchain.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/letsencrypt/live/blah.com/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)
nginx: [emerg] cannot load certificate "/etc/letsencrypt/live/blah.com/fullchain.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/letsencrypt/live/blah.com/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)

I am not yet certain this is helpful, but I have set up the Certificate Authority Service (https://cloud.google.com/certificate-authority-service/docs/best-practices).

Answer 1

Instead of using that and following setup of GCP CA setup i would suggest using cert-manager with the ingress.

Cert-manager will get the TLS cert from let's-encrypt CA , cert-manager will create the secret into k8s and store verified certificate into a secret.

You can attach secret with the ingress, as per host and use it.

Cert-manager installation

YAML example :

apiVersion: cert-manager.io/v1alpha2
kind: ClusterIssuer
metadata:
  name: cluster-issuer-name
spec:
  acme:
    server: https://acme-v02.api.letsencrypt.org/directory
    email: [email protected]
    privateKeySecretRef:
      name: secret-name
    solvers:
    - http01:
        ingress:
          class: nginx-class-name
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx-class-name
    cert-manager.io/cluster-issuer: cluster-issuer-name
    nginx.ingress.kubernetes.io/rewrite-target: /
  name: example-ingress
spec:
  rules:
  - host: sub.example.com
    http:
      paths:
      - path: /api
        backend:
          serviceName: service-name
          servicePort: 80
  tls:
  - hosts:
    - sub.example.com
    secretName: secret-name

You can read this blog for ref : https://medium.com/@harsh.manvar111/kubernetes-nginx-ingress-and-cert-manager-ssl-setup-c82313703d0d