update according to kernel official active kernel releases

Signed-off-by: Paco Xu <paco.xu@daocloud.io>

validators/kernel_validator_test.go

@@ -31,7 +31,7 @@ func TestValidateKernelVersion(t *testing.T) {
 	// they may be different.
 	// This is fine, because the test mainly tests the kernel version validation logic,
 	// not the DefaultSysSpec. The DefaultSysSpec should be tested with node e2e.
-	testRegex := []string{`^4\.4.*$`, `^4\.19.*$`, `^4\.[2-9][0-9].*$`, `^([5-9]|[1-9][0-9]+)\.([0-9]+)\.([0-9]+).*$`}
+	testRegex := []string{`^4\.19.*$`, `^4\.[2-9][0-9].*$`, `^([5-9]|[1-9][0-9]+)\.([0-9]+)\.([0-9]+).*$`}
 	for _, test := range []struct {
 		name    string
 		version string
@@ -43,9 +43,9 @@ func TestValidateKernelVersion(t *testing.T) {
 			err:     true,
 		},
 		{
-			name:    "4.4.14+ first version regex matches",
+			name:    "4.4.14+ no version regex matches",
 			version: "4.4.14+",
-			err:     false,
+			err:     true,
 		},
 		{
 			name:    "4.7.1 no version regex matches",

validators/types_unix.go

@@ -28,9 +28,9 @@ import (
 var DefaultSysSpec = SysSpec{
 	OS: "Linux",
 	KernelSpec: KernelSpec{
-		// 4.4 & 4.19 are selected as kernel Super Long Term Support (SLTS), and the Civil Infrastructure Platform will provide support until at least 2026.
-		Versions:     []string{`^4\.4.*$`, `^4\.19.*$`, `^4\.[2-9][0-9].*$`, `^([5-9]|[1-9][0-9]+)\.([0-9]+)\.([0-9]+).*$`},
-		VersionsNote: "Recommended LTS versions from the 4.x series are 4.4 and 4.19. Any 4.x version newer than 4.19 is also supported. For cgroups v2 support, the minimal version is 4.15 and the recommended version is 5.8+",
+		// 4.19 is active kernel Long Term Support (LTS) release in https://www.kernel.org/category/releases.html.
+		Versions:     []string{`^4\.19.*$`, `^4\.[2-9][0-9].*$`, `^([5-9]|[1-9][0-9]+)\.([0-9]+)\.([0-9]+).*$`},
+		VersionsNote: "Recommended LTS versions from the 4.x series is 4.19. Any 5.x or 6.x versions are also supported. For cgroups v2 support, the minimal version is 4.15 and the recommended version is 5.8+",
 		// TODO(random-liu): Add more config
 		// TODO(random-liu): Add description for each kernel configuration:
 		Required: []KernelConfig{