Add ability to create extra disks on hyperkit vms

Add the ability to create and attach extra disks to hyperkit vms.

Signed-off-by: Blaine Gardner <blaine.gardner@redhat.com>

cmd/minikube/cmd/start_flags.go

@@ -120,6 +120,7 @@ const (
 	defaultSSHUser          = "root"
 	defaultSSHPort          = 22
 	listenAddress           = "listen-address"
+	extraDisks              = "extra-disks"
 )
 
 var (
@@ -166,6 +167,7 @@ func initMinikubeFlags() {
 	startCmd.Flags().StringP(network, "", "", "network to run minikube with. Now it is used by docker/podman and KVM drivers. If left empty, minikube will create a new network.")
 	startCmd.Flags().StringVarP(&outputFormat, "output", "o", "text", "Format to print stdout in. Options include: [text,json]")
 	startCmd.Flags().StringP(trace, "", "", "Send trace events. Options include: [gcp]")
+	startCmd.Flags().Int(extraDisks, 0, "Number of extra disks created and attached to the minikube VM (currently only implemented for hyperkit driver)")
 }
 
 // initKubernetesFlags inits the commandline flags for Kubernetes related options
@@ -407,6 +409,8 @@ func generateNewConfigFromFlags(cmd *cobra.Command, k8sVersion string, drvName s
 
 	checkNumaCount(k8sVersion)
 
+	checkExtraDiskOptions(cmd, drvName)
+
 	cc = config.ClusterConfig{
 		Name:                    ClusterFlagValue(),
 		KeepContext:             viper.GetBool(keepContext),
@@ -449,6 +453,7 @@ func generateNewConfigFromFlags(cmd *cobra.Command, k8sVersion string, drvName s
 		SSHUser:                 viper.GetString(sshSSHUser),
 		SSHKey:                  viper.GetString(sshSSHKey),
 		SSHPort:                 viper.GetInt(sshSSHPort),
+		ExtraDisks:              viper.GetInt(extraDisks),
 		KubernetesConfig: config.KubernetesConfig{
 			KubernetesVersion:      k8sVersion,
 			ClusterName:            ClusterFlagValue(),
@@ -560,6 +565,11 @@ func updateExistingConfigFromFlags(cmd *cobra.Command, existing *config.ClusterC
 		out.WarningT("You cannot change the disk size for an existing minikube cluster. Please first delete the cluster.")
 	}
 
+	checkExtraDiskOptions(cmd, cc.Driver)
+	if cmd.Flags().Changed(extraDisks) && viper.GetInt(extraDisks) != existing.ExtraDisks {
+		out.WarningT("You cannot add or remove extra disks for an existing minikube cluster. Please first delete the cluster.")
+	}
+
 	updateStringFromFlag(cmd, &cc.MinikubeISO, isoURL)
 	updateBoolFromFlag(cmd, &cc.KeepContext, keepContext)
 	updateBoolFromFlag(cmd, &cc.EmbedCerts, embedCerts)
@@ -706,3 +716,20 @@ func interpretWaitFlag(cmd cobra.Command) map[string]bool {
 	klog.Infof("Waiting for components: %+v", waitComponents)
 	return waitComponents
 }
+
+func checkExtraDiskOptions(cmd *cobra.Command, driverName string) {
+	supportedDrivers := []string{driver.HyperKit}
+
+	if cmd.Flags().Changed(extraDisks) {
+		supported := false
+		for _, driver := range supportedDrivers {
+			if driverName == driver {
+				supported = true
+				break
+			}
+		}
+		if !supported {
+			out.WarningT("Specifying extra disks is currently only supported for the following drivers: {{.supported_drivers}}. If you can contribute to add this feature, please create a PR.", out.V{"supported_drivers": supportedDrivers})
+		}
+	}
+}

deploy/iso/minikube-iso/package/automount/minikube-automount

@@ -9,9 +9,15 @@ MAGIC="boot2docker, please format-me"
 # If there is a partition with `boot2docker-data` as its label, use it and be
 # very happy. Thus, you can come along if you feel like a room without a roof.
 BOOT2DOCKER_DATA=`blkid -o device -l -t LABEL=$LABEL`
-UNPARTITIONED_HD="/dev/$(lsblk | grep disk | cut -f1 -d' ')"
+DISKS="$(lsblk | grep disk | cut -f1 -d' ')"
 echo $BOOT2DOCKER_DATA
-if [ ! -n "$BOOT2DOCKER_DATA" ]; then
+for DISK in $DISKS; do
+    if [ -n "$BOOT2DOCKER_DATA" ]; then
+        # The primary minikube disk has been found or provisioned; stop provisioning other disks
+        break
+    fi
+
+    UNPARTITIONED_HD="/dev/$DISK"
     echo "Is the disk unpartitioned?, test for the 'boot2docker format-me' string"
 
     # Is the disk unpartitioned?, test for the 'boot2docker format-me' string
@@ -61,18 +67,18 @@ if [ ! -n "$BOOT2DOCKER_DATA" ]; then
                     BOOT2DOCKER_DATA=`echo "${UNPARTITIONED_HD}1"`
                     mkfs.ext4 -i 2048 -L $LABEL $BOOT2DOCKER_DATA
                 else
-                    echo "Disk unpartitioned but something is there... not doing anything"
+                    echo "Disk ($UNPARTITIONED_HD) unpartitioned but something is there... not doing anything"
                 fi
             else
-                echo "Partition table found on disk, not doing anything"
+                echo "Partition table found on disk ($UNPARTITIONED_HD), not doing anything"
             fi
         fi
     else
         # Pick the first ext4 as a fallback
         # TODO: mount all Linux partitions and look for a /var/lib/docker...
         BOOT2DOCKER_DATA=`blkid | grep -e 'TYPE="btrfs"'  -e 'TYPE="ext4"' | head -n 1 | sed 's/:.*//'`
     fi
-fi
+done
 
 echo $BOOT2DOCKER_DATA
 

pkg/drivers/common.go

@@ -17,6 +17,7 @@ limitations under the License.
 package drivers
 
 import (
+	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
@@ -41,6 +42,12 @@ func GetDiskPath(d *drivers.BaseDriver) string {
 	return filepath.Join(d.ResolveStorePath("."), d.GetMachineName()+".rawdisk")
 }
 
+// ExtraDiskPath returns the path of an additional disk suffixed with an ID.
+func ExtraDiskPath(d *drivers.BaseDriver, diskID int) string {
+	file := fmt.Sprintf("%s-%d.rawdisk", d.GetMachineName(), diskID)
+	return filepath.Join(d.ResolveStorePath("."), file)
+}
+
 // CommonDriver is the common driver base class
 type CommonDriver struct{}
 

pkg/drivers/hyperkit/driver.go

@@ -64,6 +64,7 @@ type Driver struct {
 	UUID           string
 	VpnKitSock     string
 	VSockPorts     []string
+	ExtraDisks     int
 }
 
 // NewDriver creates a new driver for a host
@@ -229,6 +230,13 @@ func (d *Driver) createHost() (*hyperkit.HyperKit, error) {
 			Trim: true,
 		},
 	}
+	for i := 0; i < d.ExtraDisks; i++ {
+		h.Disks = append(h.Disks, &hyperkit.RawDisk{
+			Path: pkgdrivers.ExtraDiskPath(d.BaseDriver, i),
+			Size: d.DiskSize,
+			Trim: true,
+		})
+	}
 
 	return h, nil
 }

pkg/minikube/config/types.go

@@ -83,6 +83,7 @@ type ClusterConfig struct {
 	ListenAddress           string   // Only used by the docker and podman driver
 	Network                 string   // only used by docker driver
 	MultiNodeRequested      bool
+	ExtraDisks              int // currently only implemented for hyperkit
 }
 
 // KubernetesConfig contains the parameters used to configure the VM Kubernetes.

pkg/minikube/registry/drvs/hyperkit/hyperkit.go

@@ -81,6 +81,7 @@ func configure(cfg config.ClusterConfig, n config.Node) (interface{}, error) {
 		VpnKitSock:     cfg.HyperkitVpnKitSock,
 		VSockPorts:     cfg.HyperkitVSockPorts,
 		Cmdline:        "loglevel=3 console=ttyS0 console=tty0 noembed nomodeset norestore waitusb=10 systemd.legacy_systemd_cgroup_controller=yes random.trust_cpu=on hw_rng_model=virtio base host=" + cfg.Name,
+		ExtraDisks:     cfg.ExtraDisks,
 	}, nil
 }