kubelet.conf (bootstrap-kubelet.conf during TLS bootstrap)
controller-manager.conf
scheduler.conf
admin.conf for the cluster admin and kubeadm itself
super-admin.conf for the cluster super-admin that can bypass RBAC
ca.crt: The Kubernetes root-CA certificate
ca.key: The Kubernetes root-CA private key
sa.pub: The public key used by the controller manager when singing a Service Account
sa.key The private key used by the controller manger when sigining a Service account
config.json: The docker config file. Typically stored at /home/user/.docker/config.json Can contain credentials for pushing/pulling images to registries if configured with docker login