Imports k8s.io/apimachinery/pkg/runtime k8s.io/apimachinery/pkg/runtime/schema k8s.io/apimachinery/pkg/util/errors k8s.io/client-go/kubernetes/scheme k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm k8s.io/kubernetes/cmd/kubeadm/app/preflight Standard library imports bytes fmt io/ioutil net net/http os regexp strconv strings text/template