Add config parameter for the cri socket path

Closes kubernetes#3153

cmd/minikube/cmd/start.go

@@ -57,6 +57,7 @@ const (
 	kubernetesVersion     = "kubernetes-version"
 	hostOnlyCIDR          = "host-only-cidr"
 	containerRuntime      = "container-runtime"
+	criSocket             = "cri-socket"
 	networkPlugin         = "network-plugin"
 	hypervVirtualSwitch   = "hyperv-virtual-switch"
 	kvmNetwork            = "kvm-network"
@@ -220,6 +221,7 @@ func runStart(cmd *cobra.Command, args []string) {
 		DNSDomain:              viper.GetString(dnsDomain),
 		FeatureGates:           viper.GetString(featureGates),
 		ContainerRuntime:       viper.GetString(containerRuntime),
+		CRISocket:              viper.GetString(criSocket),
 		NetworkPlugin:          viper.GetString(networkPlugin),
 		ServiceCIDR:            pkgutil.DefaultServiceCIDR,
 		ExtraOptions:           extraOptions,
@@ -398,6 +400,7 @@ func init() {
 	startCmd.Flags().StringSliceVar(&insecureRegistry, "insecure-registry", nil, "Insecure Docker registries to pass to the Docker daemon.  The default service CIDR range will automatically be added.")
 	startCmd.Flags().StringSliceVar(&registryMirror, "registry-mirror", nil, "Registry mirrors to pass to the Docker daemon")
 	startCmd.Flags().String(containerRuntime, "", "The container runtime to be used")
+	startCmd.Flags().String(criSocket, "", "The cri socket path to be used")
 	startCmd.Flags().String(kubernetesVersion, constants.DefaultKubernetesVersion, "The kubernetes version that the minikube VM will use (ex: v1.2.3)")
 	startCmd.Flags().String(networkPlugin, "", "The name of the network plugin")
 	startCmd.Flags().String(featureGates, "", "A set of key=value pairs that describe feature gates for alpha/experimental features.")

pkg/minikube/bootstrapper/kubeadm/kubeadm.go

@@ -234,6 +234,24 @@ func SetContainerRuntime(cfg map[string]string, runtime string) map[string]strin
 	return cfg
 }
 
+func GetCRISocket(path string, runtime string) string {
+	if path != "" {
+		glog.Infoln("Container runtime interface socket provided, using path.")
+		return path
+	}
+
+	switch runtime {
+	case "crio", "cri-o":
+		path = "/var/run/crio/crio.sock"
+	case "containerd":
+		path = "/run/containerd/containerd.sock"
+	default:
+		path = ""
+	}
+
+	return path
+}
+
 // NewKubeletConfig generates a new systemd unit containing a configured kubelet
 // based on the options present in the KubernetesConfig.
 func NewKubeletConfig(k8s config.KubernetesConfig) (string, error) {
@@ -347,6 +365,8 @@ func generateConfig(k8s config.KubernetesConfig) (string, error) {
 		return "", errors.Wrap(err, "parsing kubernetes version")
 	}
 
+	criSocket := GetCRISocket(k8s.CRISocket, k8s.ContainerRuntime)
+
 	// parses a map of the feature gates for kubeadm and component
 	kubeadmFeatureArgs, componentFeatureArgs, err := ParseFeatureArgs(k8s.FeatureGates)
 	if err != nil {
@@ -367,6 +387,7 @@ func generateConfig(k8s config.KubernetesConfig) (string, error) {
 		KubernetesVersion string
 		EtcdDataDir       string
 		NodeName          string
+		CRISocket         string
 		ExtraArgs         []ComponentExtraArgs
 		FeatureArgs       map[string]bool
 		NoTaintMaster     bool
@@ -378,6 +399,7 @@ func generateConfig(k8s config.KubernetesConfig) (string, error) {
 		KubernetesVersion: k8s.KubernetesVersion,
 		EtcdDataDir:       "/data/minikube", //TODO(r2d4): change to something else persisted
 		NodeName:          k8s.NodeName,
+		CRISocket:         criSocket,
 		ExtraArgs:         extraComponentConfig,
 		FeatureArgs:       kubeadmFeatureArgs,
 		NoTaintMaster:     false,

pkg/minikube/bootstrapper/kubeadm/templates.go

@@ -38,6 +38,7 @@ networking:
 etcd:
   dataDir: {{.EtcdDataDir}}
 nodeName: {{.NodeName}}
+{{if .CRISocket}}criSocket: {{.CRISocket}}{{end}}
 {{range .ExtraArgs}}{{.Component}}:{{range $i, $val := printMapInOrder .Options ": " }}
   {{$val}}{{end}}
 {{end}}{{if .FeatureArgs}}featureGates: {{range $i, $val := .FeatureArgs}}

pkg/minikube/config/types.go

@@ -63,6 +63,7 @@ type KubernetesConfig struct {
 	APIServerIPs      []net.IP
 	DNSDomain         string
 	ContainerRuntime  string
+	CRISocket         string
 	NetworkPlugin     string
 	FeatureGates      string
 	ServiceCIDR       string