Upgrade kubeadm's version of docker support

cmd/kubeadm/app/util/system/docker_validator.go

@@ -38,7 +38,7 @@ func (d *DockerValidator) Name() string {
 
 const (
 	dockerConfigPrefix        = "DOCKER_"
-	maxDockerValidatedVersion = "17.03"
+	maxDockerValidatedVersion = "18.06"
 )
 
 // TODO(random-liu): Add more validating items.

cmd/kubeadm/app/util/system/docker_validator_test.go

@@ -28,7 +28,7 @@ func TestValidateDockerInfo(t *testing.T) {
 		Reporter: DefaultReporter,
 	}
 	spec := &DockerSpec{
-		Version:     []string{`1\.1[1-3]\..*`, `17\.03\..*`}, // Requires [1.11, 17.03].
+		Version:     []string{`1\.1[1-3]\..*`, `18\.06\..*`}, // Requires [1.11, 18.06].
 		GraphDriver: []string{"driver_1", "driver_2"},
 	}
 	for _, test := range []struct {
@@ -69,7 +69,12 @@ func TestValidateDockerInfo(t *testing.T) {
 		{
 			info: types.Info{Driver: "driver_2", ServerVersion: "17.06.0-ce"},
 			err:  false,
-			warn: true,
+			warn: false,
+		},
+		{
+			info: types.Info{Driver: "driver_2", ServerVersion: "18.06.0-ce"},
+			err:  false,
+			warn: false,
 		},
 	} {
 		warn, err := v.validateDockerInfo(spec, test.info)

cmd/kubeadm/app/util/system/types_unix.go

@@ -62,7 +62,7 @@ var DefaultSysSpec = SysSpec{
 	Cgroups: []string{"cpu", "cpuacct", "cpuset", "devices", "freezer", "memory"},
 	RuntimeSpec: RuntimeSpec{
 		DockerSpec: &DockerSpec{
-			Version:     []string{`1\.1[1-3]\..*`, `17\.03\..*`}, // Requires [1.11, 17.03]
+			Version:     []string{`1\.1[1-3]\..*`, `18\.06\..*`}, // Requires [1.11, 18.06]
 			GraphDriver: []string{"aufs", "overlay", "overlay2", "devicemapper", "zfs"},
 		},
 	},

cmd/kubeadm/app/util/system/types_windows.go

@@ -38,7 +38,7 @@ var DefaultSysSpec = SysSpec{
 	Cgroups: []string{},
 	RuntimeSpec: RuntimeSpec{
 		DockerSpec: &DockerSpec{
-			Version:     []string{`17\.03\..*`}, //Requires [17.03] or later
+			Version:     []string{`18\.06\..*`}, //Requires [18.06] or later
 			GraphDriver: []string{"windowsfilter"},
 		},
 	},