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Question 22 | Check how long certificates are valid

 

Check how long the kube-apiserver server certificate is valid on cluster2-master1. Do this with openssl or cfssl. Write the exipiration date into /opt/course/22/expiration.

Also run the correct kubeadm command to list the expiration dates and confirm both methods show the same date.

Write the correct kubeadm command that would renew the apiserver server certificate into /opt/course/22/kubeadm-renew-certs.sh.

 

Answer:

First let's find that certificate:

Next we use openssl to find out the expiration date:

There we have it, so we write it in the required location on our main terminal:

And we use the feature from kubeadm to get the expiration too:

Looking good. And finally we write the command that would renew all certificates into the requested location:

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