FEATURE STATE: Kubernetes v1.15 [stable]  Client certificates generated by kubeadm expire after 1 year. This page explains how to manage certificate renewals with kubeadm.
Before you begin You should be familiar with PKI certificates and requirements in Kubernetes.
Using custom certificates By default, kubeadm generates all the certificates needed for a cluster to run. You can override this behavior by providing your own certificates.
To do so, you must place them in whatever directory is specified by the --cert-dir flag or the certificatesDir field of kubeadm's ClusterConfiguration.

So in school we need to install a certificate to access https sites. In firefox, I can import the certificate. However, I can't do so with the command line. For example, running git push I get:

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