Kubectl -n kube-system describe configmaps kube-root-ca.crt

Name:         kube-root-ca.crt
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/description:
                Contains a CA bundle that can be used to verify the kube-apiserver when using internal endpoints such as the internal service IP or kubern...

Data
====
ca.crt:
----
-----BEGIN CERTIFICATE-----
MIIC5zCCAc+gAwIBAgIBADANBgkqhkiG9w0BAQsFADAVMRMwEQYDVQQDEwprdWJl
cm5ldGVzMB4XDTIyMDYxMDE4MjEzMloXDTMyMDYwNzE4MjEzMlowFTETMBEGA1UE
XXXXXXX
+sxGlR3jH6/1KjoRhxI31FxE/Zppuhetpqu6
-----END CERTIFICATE-----

BinaryData
====

Events:  <none>