Ping pong example stops working after certificate renewal

[wallrj]

In https://github.com/jetstack/cert-manager-nginx-plus-lab#testing-the-deployment-1

If you open the browser and go to https://: it will display the certificate details of the other service that it internally contacted inside the Kubernetes cluster.

I found that the server wasn't responding.
Nor when I try and curl the service from the Ubuntu virtual machine.

It looks like the certificate rotation mechanism might not be working properly:

sysadmin@ubuntu-1804-srv:~$ kubectl get pods
NAME                                         READY   STATUS    RESTARTS   AGE
nginx-workload-deployment-6d6794b959-qjt84   1/1     Running   0          63m
ping-deployment-dfb6c6457-tnlzn              1/1     Running   0          13m
pong-deployment-659c57bc67-9n7pk             1/1     Running   0          13m


sysadmin@ubuntu-1804-srv:~$ kubectl logs ping-deployment-dfb6c6457-tnlzn 
2020/03/31 17:36:03 tls: failed to find any PEM data in certificate input
2020/03/31 17:36:03 tls: failed to find any PEM data in certificate input
2020/03/31 17:37:27 Certificate renewed
2020/03/31 17:37:27 http: Server closed
2020/03/31 17:37:27 http: Server closed


sysadmin@ubuntu-1804-srv:~$ kubectl logs pong-deployment-659c57bc67-9n7pk 
2020/03/31 17:36:03 tls: failed to find any PEM data in certificate input
2020/03/31 17:36:03 tls: failed to find any PEM data in certificate input
2020/03/31 17:37:34 Certificate renewed
2020/03/31 17:37:34 http: Server closed
2020/03/31 17:37:34 http: Server closed