Remove kubernetes 1.27 support

Signed-off-by: Waleed Malik <ahmedwaleedmalik@gmail.com>

README.md

@@ -46,7 +46,6 @@ Currently supported K8S versions are:
 - 1.30
 - 1.29
 - 1.28
-- 1.27
 
 ### Community Providers
 

pkg/controller/machine/controller.go

@@ -457,11 +457,7 @@ func (r *Reconciler) reconcile(ctx context.Context, log *zap.SugaredLogger, mach
 	}
 
 	// case 3.2: if the node exists and both external and internal CCM are not available. Then set the provider-id for the node.
-	inTree, err := providerconfigtypes.IntreeCloudProviderImplementationSupported(providerConfig.CloudProvider, machine.Spec.Versions.Kubelet)
-	if err != nil {
-		return nil, fmt.Errorf("failed to check if cloud provider %q has in-tree implementation: %w", providerConfig.CloudProvider, err)
-	}
-
+	inTree := providerconfigtypes.IntreeCloudProviderImplementationSupported(providerConfig.CloudProvider)
 	if !inTree && !r.nodeSettings.ExternalCloudProvider && node.Spec.ProviderID == "" {
 		providerID := fmt.Sprintf(ProviderIDPattern, providerConfig.CloudProvider, machine.UID)
 		if err := r.updateNode(ctx, node, func(n *corev1.Node) {
@@ -897,11 +893,7 @@ func (r *Reconciler) ensureInstanceExistsForMachine(
 
 	var providerID string
 	if machine.Spec.ProviderID == nil {
-		inTree, err := providerconfigtypes.IntreeCloudProviderImplementationSupported(providerConfig.CloudProvider, machine.Spec.Versions.Kubelet)
-		if err != nil {
-			return nil, fmt.Errorf("failed to check if cloud provider %q has in-tree implementation: %w", providerConfig.CloudProvider, err)
-		}
-
+		inTree := providerconfigtypes.IntreeCloudProviderImplementationSupported(providerConfig.CloudProvider)
 		// If both external and internal CCM are not available. We set provider-id for the machine explicitly.
 		if !inTree && !r.nodeSettings.ExternalCloudProvider {
 			providerID = fmt.Sprintf(ProviderIDPattern, providerConfig.CloudProvider, machine.UID)

pkg/providerconfig/types/types.go

@@ -23,8 +23,6 @@ import (
 	"fmt"
 	"strconv"
 
-	"github.com/Masterminds/semver/v3"
-
 	clusterv1alpha1 "github.com/kubermatic/machine-controller/pkg/apis/cluster/v1alpha1"
 	"github.com/kubermatic/machine-controller/pkg/cloudprovider/util"
 	"github.com/kubermatic/machine-controller/pkg/jsonutil"
@@ -120,25 +118,11 @@ var (
 	}
 )
 
-func IntreeCloudProviderImplementationSupported(cloudProvider CloudProvider, version string) (inTree bool, err error) {
-	kubeletVer, err := semver.NewVersion(version)
-	if err != nil {
-		return false, fmt.Errorf("failed to parse kubelet version: %w", err)
-	}
-
-	switch cloudProvider {
-	case CloudProviderAzure, CloudProviderVsphere, CloudProviderGoogle:
-		return true, nil
-	case CloudProviderAWS:
-		// In-tree AWS support was removed in Kubernetes 1.27.
-		ltKube127Condition, _ := semver.NewConstraint("< 1.27")
-		if ltKube127Condition.Check(kubeletVer) {
-			return true, nil
-		}
-		return false, nil
-	default:
-		return false, nil
+func IntreeCloudProviderImplementationSupported(cloudProvider CloudProvider) (inTree bool) {
+	if cloudProvider == CloudProviderAzure || cloudProvider == CloudProviderVsphere || cloudProvider == CloudProviderGoogle {
+		return true
 	}
+	return false
 }
 
 // DNSConfig contains a machine's DNS configuration.

test/e2e/provisioning/all_e2e_test.go

@@ -348,7 +348,7 @@ func TestOpenstackProvisioningE2E(t *testing.T) {
 	}
 
 	// In-tree cloud provider is not supported from Kubernetes v1.26.
-	selector := And(Not(OsSelector("amzn2")), Not(VersionSelector("1.27.13", "1.28.11", "1.29.6", "1.30.2")))
+	selector := And(Not(OsSelector("amzn2")), Not(VersionSelector("1.28.11", "1.29.6", "1.30.2")))
 	runScenarios(context.Background(), t, selector, params, OSManifest, fmt.Sprintf("os-%s", *testRunIdentifier))
 }
 
@@ -424,7 +424,7 @@ func TestAWSProvisioningE2E(t *testing.T) {
 	}
 
 	// In-tree cloud provider is not supported from Kubernetes v1.27.
-	selector := Not(VersionSelector("1.27.13", "1.28.11", "1.29.6", "1.30.2"))
+	selector := Not(VersionSelector("1.28.11", "1.29.6", "1.30.2"))
 
 	// act
 	params := []string{fmt.Sprintf("<< AWS_ACCESS_KEY_ID >>=%s", awsKeyID),
@@ -478,7 +478,7 @@ func TestAWSSpotInstanceProvisioningE2E(t *testing.T) {
 	}
 	// Since we are only testing the spot instance functionality, testing it against a single OS is sufficient.
 	// In-tree cloud provider is not supported from Kubernetes v1.27.
-	selector := And(OsSelector("ubuntu"), Not(VersionSelector("1.27.13", "1.28.11", "1.29.6", "1.30.2")))
+	selector := And(OsSelector("ubuntu"), Not(VersionSelector("1.28.11", "1.29.6", "1.30.2")))
 
 	// act
 	params := []string{fmt.Sprintf("<< AWS_ACCESS_KEY_ID >>=%s", awsKeyID),
@@ -500,7 +500,7 @@ func TestAWSARMProvisioningE2E(t *testing.T) {
 		t.Fatal("Unable to run the test suite, AWS_E2E_TESTS_KEY_ID or AWS_E2E_TESTS_SECRET environment variables cannot be empty")
 	}
 	// In-tree cloud provider is not supported from Kubernetes v1.27.
-	selector := And(OsSelector("ubuntu"), Not(VersionSelector("1.27.13", "1.28.11", "1.29.6", "1.30.2")))
+	selector := And(OsSelector("ubuntu"), Not(VersionSelector("1.28.11", "1.29.6", "1.30.2")))
 
 	// act
 	params := []string{fmt.Sprintf("<< AWS_ACCESS_KEY_ID >>=%s", awsKeyID),

test/e2e/provisioning/helper.go

@@ -34,7 +34,6 @@ var (
 	scenarios = buildScenarios()
 
 	versions = []*semver.Version{
-		semver.MustParse("v1.27.13"),
 		semver.MustParse("v1.28.11"),
 		semver.MustParse("v1.29.6"),
 		semver.MustParse("v1.30.2"),