Configuring a TLS certificate in Kubernetes

This week I was given the assignment to update a TLS certificate on one of our Kubernetes clusters from a .pfx file and so I though I would share how I solved it and hopefully it can help someone else in the same situation.

1. Extract the .key file from the .pfx file:

openssl pkcs12 -in pfx-filename.pfx -nocerts -out key-filename.key

2. Decrypt the .key file:

openssl rsa -in key-filename.key -out key-filename-decrypted.key

3. Extract the .crt file from .pfx file:

openssl pkcs12 -in pfx-filename.pfx -clcerts -nokeys -out crt-filename.crt

4. Create a secret in your Kubernetes cluster:

kubectl create secret tls your-secret-name --cert crt-filename.crt --key key-filename-decrypted.key

(ps. you can also define you secrets in a .yml file but that's not the approach I took this time.)

5. Verify that your new secret exists in your clusters namespace:

kubectl get secret -n your-namespace

6. Update your Ingress tls to match your new secret:

kind: Ingress
  name: your-ingress
  - secretName: your-secret-name      
  - hosts: 

7. Apply using continuous deployment or manually using:

kubectl apply -f your-ingress.yml

8. Test your new https host (wait five minutes after deploy):

curl -v

9. Grab a cup of coffee, you’ve deserved it! ☕️

Cheers friends! ❤️