[to add a another cluster]
$ kubectl config set-cluster new-cluster --server=https://new-cluster.com --certificate-authority=new-cluster-ca-file

[to adding or modifying user credentials]
$ kubectl config set-credentials new-user --client-certificate=new-user-cert-file --client-key=new-user-key-file

[setting a context]
$ kubectl config set-context user-cluster --cluster=new-cluster --namespace=default --user=new-user

[to delete a user]
$ kubectl config unset users.USER_NAME

[to delete a cluster]
$ kubectl config unset clusters.CLUSTER_NAME

[to delete a context]
$ kubectl config unset contexts.CONTEXT_NAME
