break up kubeadm init action into logical actions

pkg/cluster/nodes/node.go

@@ -17,13 +17,10 @@ limitations under the License.
 package nodes
 
 import (
-	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
-	"regexp"
 	"strconv"
 	"strings"
 	"sync"
@@ -225,45 +222,6 @@ func (n *Node) Role() (role string, err error) {
 	return role, nil
 }
 
-// matches kubeconfig server entry like:
-//    server: https://172.17.0.2:6443
-// which we rewrite to:
-//    server: https://localhost:$PORT
-var serverAddressRE = regexp.MustCompile(`^(\s+server:) https://.*:\d+$`)
-
-// WriteKubeConfig writes a fixed KUBECONFIG to dest
-// this should only be called on a control plane node
-// While copyng to the host machine the control plane address
-// is replaced with local host and the control plane port with
-// a randomly generated port reserved during node creation.
-func (n *Node) WriteKubeConfig(dest string, hostPort int32) error {
-	cmd := n.Command("cat", "/etc/kubernetes/admin.conf")
-	lines, err := exec.CombinedOutputLines(cmd)
-	if err != nil {
-		return errors.Wrap(err, "failed to get kubeconfig from node")
-	}
-
-	// fix the config file, swapping out the server for the forwarded localhost:port
-	var buff bytes.Buffer
-	for _, line := range lines {
-		match := serverAddressRE.FindStringSubmatch(line)
-		if len(match) > 1 {
-			line = fmt.Sprintf("%s https://localhost:%d", match[1], hostPort)
-		}
-		buff.WriteString(line)
-		buff.WriteString("\n")
-	}
-
-	// create the directory to contain the KUBECONFIG file.
-	// 0755 is taken from client-go's config handling logic: https://github.com/kubernetes/client-go/blob/5d107d4ebc00ee0ea606ad7e39fd6ce4b0d9bf9e/tools/clientcmd/loader.go#L412
-	err = os.MkdirAll(filepath.Dir(dest), 0755)
-	if err != nil {
-		return errors.Wrap(err, "failed to create kubeconfig output directory")
-	}
-
-	return ioutil.WriteFile(dest, buff.Bytes(), 0600)
-}
-
 // WriteFile writes content to dest on the node
 func (n *Node) WriteFile(dest, content string) error {
 	// create destination directory