add delete-on-failure flag

cmd/minikube/cmd/node_add.go

@@ -18,10 +18,8 @@ package cmd
 
 import (
 	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
 	"k8s.io/minikube/pkg/minikube/config"
 	"k8s.io/minikube/pkg/minikube/driver"
-	"k8s.io/minikube/pkg/minikube/exit"
 	"k8s.io/minikube/pkg/minikube/mustload"
 	"k8s.io/minikube/pkg/minikube/node"
 	"k8s.io/minikube/pkg/minikube/out"
@@ -56,21 +54,18 @@ var nodeAddCmd = &cobra.Command{
 		}
 
 		if err := node.Add(cc, n); err != nil {
-			exit.WithError("Error adding node to cluster", err)
+			maybeDeleteAndRetry(*cc, n, nil, err)
 		}
 
 		out.T(out.Ready, "Successfully added {{.name}} to {{.cluster}}!", out.V{"name": name, "cluster": cc.Name})
 	},
 }
 
 func init() {
+	//We should figure out which minikube start flags to actually import
 	nodeAddCmd.Flags().BoolVar(&cp, "control-plane", false, "If true, the node added will also be a control plane in addition to a worker.")
 	nodeAddCmd.Flags().BoolVar(&worker, "worker", true, "If true, the added node will be marked for work. Defaults to true.")
-	//We should figure out which of these flags to actually import
-	startCmd.Flags().Visit(
-		func(f *pflag.Flag) {
-			nodeAddCmd.Flags().AddFlag(f)
-		},
-	)
+	nodeAddCmd.Flags().Bool(deleteOnFailure, false, "If set, delete the current cluster if start fails and try again. Defaults to false.")
+
 	nodeCmd.AddCommand(nodeAddCmd)
 }

cmd/minikube/cmd/node_start.go

@@ -49,12 +49,15 @@ var nodeStartCmd = &cobra.Command{
 			exit.WithError("retrieving node", err)
 		}
 
-		// Start it up baby
-		node.Start(*cc, *n, nil, false)
+		_, err = node.Start(*cc, *n, nil, false)
+		if err != nil {
+			maybeDeleteAndRetry(*cc, *n, nil, err)
+		}
 	},
 }
 
 func init() {
 	nodeStartCmd.Flags().String("name", "", "The name of the node to start")
+	nodeStartCmd.Flags().Bool(deleteOnFailure, false, "If set, delete the current cluster if start fails and try again. Defaults to false.")
 	nodeCmd.AddCommand(nodeStartCmd)
 }

cmd/minikube/cmd/start.go

@@ -124,6 +124,7 @@ const (
 	natNicType              = "nat-nic-type"
 	nodes                   = "nodes"
 	preload                 = "preload"
+	deleteOnFailure         = "delete-on-failure"
 )
 
 var (
@@ -177,6 +178,7 @@ func initMinikubeFlags() {
 	startCmd.Flags().Bool(installAddons, true, "If set, install addons. Defaults to true.")
 	startCmd.Flags().IntP(nodes, "n", 1, "The number of nodes to spin up. Defaults to 1.")
 	startCmd.Flags().Bool(preload, true, "If set, download tarball of preloaded images if available to improve start time. Defaults to true.")
+	startCmd.Flags().Bool(deleteOnFailure, false, "If set, delete the current cluster if start fails and try again. Defaults to false.")
 }
 
 // initKubernetesFlags inits the commandline flags for kubernetes related options
@@ -353,7 +355,10 @@ func runStart(cmd *cobra.Command, args []string) {
 		}
 	}
 
-	kubeconfig := node.Start(cc, n, existingAddons, true)
+	kubeconfig, err := node.Start(cc, n, existingAddons, true)
+	if err != nil {
+		kubeconfig = maybeDeleteAndRetry(cc, n, existingAddons, err)
+	}
 
 	numNodes := viper.GetInt(nodes)
 	if numNodes == 1 && existing != nil {
@@ -467,6 +472,38 @@ func showKubectlInfo(kcs *kubeconfig.Settings, k8sVersion string, machineName st
 	return nil
 }
 
+func maybeDeleteAndRetry(cc config.ClusterConfig, n config.Node, existingAddons map[string]bool, originalErr error) *kubeconfig.Settings {
+	if viper.GetBool(deleteOnFailure) {
+		out.T(out.Warning, "Node {{.name}} failed to start, deleting and trying again.", out.V{"name": n.Name})
+		// Start failed, delete the cluster and try again
+		profile, err := config.LoadProfile(cc.Name)
+		if err != nil {
+			out.ErrT(out.Meh, `"{{.name}}" profile does not exist, trying anyways.`, out.V{"name": cc.Name})
+		}
+
+		err = deleteProfile(profile)
+		if err != nil {
+			out.WarningT("Failed to delete cluster {{.name}}, proceeding with retry anyway.", out.V{"name": cc.Name})
+		}
+
+		var kubeconfig *kubeconfig.Settings
+		for _, v := range cc.Nodes {
+			k, err := node.Start(cc, v, existingAddons, v.ControlPlane)
+			if v.ControlPlane {
+				kubeconfig = k
+			}
+			if err != nil {
+				// Ok we failed again, let's bail
+				exit.WithError("Start failed after cluster deletion", err)
+			}
+		}
+		return kubeconfig
+	}
+	// Don't delete the cluster unless they ask
+	exit.WithError("startup failed", originalErr)
+	return nil
+}
+
 func selectDriver(existing *config.ClusterConfig) registry.DriverState {
 	// Technically unrelated, but important to perform before detection
 	driver.SetLibvirtURI(viper.GetString(kvmQemuURI))

pkg/minikube/node/node.go

@@ -39,9 +39,8 @@ func Add(cc *config.ClusterConfig, n config.Node) error {
 		return errors.Wrap(err, "save node")
 	}
 
-	// TODO: Start should return an error rather than calling exit!
-	Start(*cc, n, nil, false)
-	return nil
+	_, err := Start(*cc, n, nil, false)
+	return err
 }
 
 // Delete stops and deletes the given node from the given cluster

pkg/minikube/node/start.go

@@ -65,7 +65,7 @@ const (
 )
 
 // Start spins up a guest and starts the kubernetes node.
-func Start(cc config.ClusterConfig, n config.Node, existingAddons map[string]bool, apiServer bool) *kubeconfig.Settings {
+func Start(cc config.ClusterConfig, n config.Node, existingAddons map[string]bool, apiServer bool) (*kubeconfig.Settings, error) {
 	cp := ""
 	if apiServer {
 		cp = "control plane "
@@ -100,7 +100,7 @@ func Start(cc config.ClusterConfig, n config.Node, existingAddons map[string]boo
 
 	sv, err := util.ParseKubernetesVersion(n.KubernetesVersion)
 	if err != nil {
-		exit.WithError("Failed to parse kubernetes version", err)
+		return nil, errors.Wrap(err, "Failed to parse kubernetes version")
 	}
 
 	// configure the runtime (docker, containerd, crio)
@@ -113,7 +113,7 @@ func Start(cc config.ClusterConfig, n config.Node, existingAddons map[string]boo
 		// Must be written before bootstrap, otherwise health checks may flake due to stale IP
 		kcs = setupKubeconfig(host, &cc, &n, cc.Name)
 		if err != nil {
-			exit.WithError("Failed to setup kubeconfig", err)
+			return nil, errors.Wrap(err, "Failed to setup kubeconfig")
 		}
 
 		// setup kubeadm (must come after setupKubeconfig)
@@ -125,16 +125,16 @@ func Start(cc config.ClusterConfig, n config.Node, existingAddons map[string]boo
 
 		// write the kubeconfig to the file system after everything required (like certs) are created by the bootstrapper
 		if err := kubeconfig.Update(kcs); err != nil {
-			exit.WithError("Failed to update kubeconfig file.", err)
+			return nil, errors.Wrap(err, "Failed to update kubeconfig file.")
 		}
 	} else {
 		bs, err = cluster.Bootstrapper(machineAPI, viper.GetString(cmdcfg.Bootstrapper), cc, n)
 		if err != nil {
-			exit.WithError("Failed to get bootstrapper", err)
+			return nil, errors.Wrap(err, "Failed to get bootstrapper")
 		}
 
 		if err = bs.SetupCerts(cc.KubernetesConfig, n); err != nil {
-			exit.WithError("setting up certs", err)
+			return nil, errors.Wrap(err, "setting up certs")
 		}
 	}
 
@@ -159,34 +159,34 @@ func Start(cc config.ClusterConfig, n config.Node, existingAddons map[string]boo
 		// Skip pre-existing, because we already waited for health
 		if viper.GetBool(waitUntilHealthy) && !preExists {
 			if err := bs.WaitForNode(cc, n, viper.GetDuration(waitTimeout)); err != nil {
-				exit.WithError("Wait failed", err)
+				return nil, errors.Wrap(err, "Wait failed")
 			}
 		}
 	} else {
 		if err := bs.UpdateNode(cc, n, cr); err != nil {
-			exit.WithError("Updating node", err)
+			return nil, errors.Wrap(err, "Updating node")
 		}
 
 		cp, err := config.PrimaryControlPlane(&cc)
 		if err != nil {
-			exit.WithError("Getting primary control plane", err)
+			return nil, errors.Wrap(err, "Getting primary control plane")
 		}
 		cpBs, err := cluster.Bootstrapper(machineAPI, viper.GetString(cmdcfg.Bootstrapper), cc, cp)
 		if err != nil {
-			exit.WithError("Getting bootstrapper", err)
+			return nil, errors.Wrap(err, "Getting bootstrapper")
 		}
 
 		joinCmd, err := cpBs.GenerateToken(cc)
 		if err != nil {
-			exit.WithError("generating join token", err)
+			return nil, errors.Wrap(err, "generating join token")
 		}
 
 		if err = bs.JoinCluster(cc, n, joinCmd); err != nil {
-			exit.WithError("joining cluster", err)
+			return nil, errors.Wrap(err, "joining cluster")
 		}
 	}
 
-	return kcs
+	return kcs, nil
 }
 
 // ConfigureRuntimes does what needs to happen to get a runtime going.