Add cluster-dns server arg support

pkg/cli/cmds/server.go

@@ -9,6 +9,7 @@ type Server struct {
 	ClusterCIDR      string
 	ClusterSecret    string
 	ServiceCIDR      string
+	ClusterDNS       string
 	HTTPSPort        int
 	HTTPPort         int
 	DataDir          string
@@ -71,6 +72,12 @@ func NewServerCommand(action func(*cli.Context) error) cli.Command {
 				Destination: &ServerConfig.ServiceCIDR,
 				Value:       "10.43.0.0/16",
 			},
+			cli.StringFlag{
+				Name:        "cluster-dns",
+				Usage:       "Cluster IP for coredns service. Should be in your service-cidr range",
+				Destination: &ServerConfig.ClusterDNS,
+				Value:       "10.43.0.10",
+			},
 			cli.StringSliceFlag{
 				Name:  "no-deploy",
 				Usage: "Do not deploy packaged components (valid items: coredns, servicelb, traefik)",

pkg/cli/server/server.go

@@ -86,7 +86,7 @@ func run(app *cli.Context, cfg *cmds.Server) error {
 	if err != nil {
 		return errors.Wrapf(err, "Invalid CIDR %s: %v", cfg.ServiceCIDR, err)
 	}
-
+	serverConfig.ControlConfig.ClusterDNS = net2.ParseIP(cfg.ClusterDNS)
 	// TODO: support etcd
 	serverConfig.ControlConfig.NoLeaderElect = true