remove the ipvs checks from the preflight checks

Signed-off-by: Yassine TIJANI <ytijani@vmware.com>

cmd/kubeadm/.import-restrictions

@@ -77,9 +77,7 @@
 				"k8s.io/kubernetes/pkg/util/conntrack",
 				"k8s.io/kubernetes/pkg/util/dbus",
 				"k8s.io/kubernetes/pkg/util/hash",
-				"k8s.io/kubernetes/pkg/util/ipset",
 				"k8s.io/kubernetes/pkg/util/iptables",
-				"k8s.io/kubernetes/pkg/util/ipvs",
 				"k8s.io/kubernetes/pkg/util/metrics",
 				"k8s.io/kubernetes/pkg/util/parsers",
 				"k8s.io/kubernetes/pkg/util/sysctl",
@@ -110,7 +108,6 @@
 				"github.com/coreos/etcd/pkg/transport",
 				"github.com/davecgh/go-spew/spew",
 				"github.com/docker/distribution/reference",
-				"github.com/docker/libnetwork/ipvs",
 				"github.com/godbus/dbus",
 				"github.com/gogo/protobuf/proto",
 				"github.com/gogo/protobuf/sortkeys",

cmd/kubeadm/app/cmd/phases/join/preflight.go

@@ -99,10 +99,6 @@ func runPreflight(c workflow.RunData) error {
 
 	// Continue with more specific checks based on the init configuration
 	klog.V(1).Infoln("[preflight] Running configuration dependant checks")
-	if err := preflight.RunOptionalJoinNodeChecks(utilsexec.New(), &initCfg.ClusterConfiguration, j.IgnorePreflightErrors()); err != nil {
-		return err
-	}
-
 	if j.Cfg().ControlPlane != nil {
 		// Checks if the cluster configuration supports
 		// joining a new control plane instance and if all the necessary certificates are provided

cmd/kubeadm/app/preflight/BUILD

@@ -26,7 +26,6 @@ go_library(
         "//cmd/kubeadm/app/util/system:go_default_library",
         "//cmd/kubeadm/app/version:go_default_library",
         "//pkg/registry/core/service/ipallocator:go_default_library",
-        "//pkg/util/ipvs:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/net:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/sets:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/version:go_default_library",
@@ -39,8 +38,6 @@ go_library(
     ] + select({
         "@io_bazel_rules_go//go/platform:linux": [
             "//cmd/kubeadm/app/util:go_default_library",
-            "//pkg/proxy/ipvs:go_default_library",
-            "//pkg/util/ipset:go_default_library",
         ],
         "//conditions:default": [],
     }),

cmd/kubeadm/app/preflight/checks.go

@@ -49,7 +49,6 @@ import (
 	"k8s.io/kubernetes/cmd/kubeadm/app/util/system"
 	kubeadmversion "k8s.io/kubernetes/cmd/kubeadm/app/version"
 	"k8s.io/kubernetes/pkg/registry/core/service/ipallocator"
-	ipvsutil "k8s.io/kubernetes/pkg/util/ipvs"
 	utilsexec "k8s.io/utils/exec"
 	utilsnet "k8s.io/utils/net"
 )
@@ -865,20 +864,10 @@ func (ncc NumCPUCheck) Check() (warnings, errorList []error) {
 	return warnings, errorList
 }
 
-// IPVSProxierCheck tests if IPVS proxier can be used.
-type IPVSProxierCheck struct {
-	exec utilsexec.Interface
-}
-
-// Name returns label for IPVSProxierCheck
-func (r IPVSProxierCheck) Name() string {
-	return "IPVSProxierCheck"
-}
-
 // RunInitNodeChecks executes all individual, applicable to control-plane node checks.
 // The boolean flag 'isSecondaryControlPlane' controls whether we are running checks in a --join-control-plane scenario.
 // The boolean flag 'downloadCerts' controls whether we should skip checks on certificates because we are downloading them.
-// If the flag is set to true we should skip checks already executed by RunJoinNodeChecks and RunOptionalJoinNodeChecks.
+// If the flag is set to true we should skip checks already executed by RunJoinNodeChecks.
 func RunInitNodeChecks(execer utilsexec.Interface, cfg *kubeadmapi.InitConfiguration, ignorePreflightErrors sets.String, isSecondaryControlPlane bool, downloadCerts bool) error {
 	if !isSecondaryControlPlane {
 		// First, check if we're root separately from the other preflight checks and fail fast
@@ -911,11 +900,6 @@ func RunInitNodeChecks(execer utilsexec.Interface, cfg *kubeadmapi.InitConfigura
 	if !isSecondaryControlPlane {
 		checks = addCommonChecks(execer, cfg.KubernetesVersion, &cfg.NodeRegistration, checks)
 
-		// Check if IVPS kube-proxy mode is supported
-		if cfg.ComponentConfigs.KubeProxy != nil && cfg.ComponentConfigs.KubeProxy.Mode == ipvsutil.IPVSProxyMode {
-			checks = append(checks, IPVSProxierCheck{exec: execer})
-		}
-
 		// Check if Bridge-netfilter and IPv6 relevant flags are set
 		if ip := net.ParseIP(cfg.LocalAPIEndpoint.AdvertiseAddress); ip != nil {
 			if utilsnet.IsIPv6(ip) {
@@ -1001,18 +985,6 @@ func RunJoinNodeChecks(execer utilsexec.Interface, cfg *kubeadmapi.JoinConfigura
 	return RunChecks(checks, os.Stderr, ignorePreflightErrors)
 }
 
-// RunOptionalJoinNodeChecks executes all individual, applicable to node configuration dependant checks
-func RunOptionalJoinNodeChecks(execer utilsexec.Interface, cfg *kubeadmapi.ClusterConfiguration, ignorePreflightErrors sets.String) error {
-	checks := []Checker{}
-
-	// Check if IPVS kube-proxy mode is supported
-	if cfg.ComponentConfigs.KubeProxy != nil && cfg.ComponentConfigs.KubeProxy.Mode == ipvsutil.IPVSProxyMode {
-		checks = append(checks, IPVSProxierCheck{exec: execer})
-	}
-
-	return RunChecks(checks, os.Stderr, ignorePreflightErrors)
-}
-
 // addCommonChecks is a helper function to duplicate checks that are common between both the
 // kubeadm init and join commands
 func addCommonChecks(execer utilsexec.Interface, k8sVersion string, nodeReg *kubeadmapi.NodeRegistrationOptions, checks []Checker) []Checker {

cmd/kubeadm/app/preflight/checks_darwin.go

@@ -25,9 +25,3 @@ package preflight
 func (idsc IsDockerSystemdCheck) Check() (warnings, errorList []error) {
 	return nil, nil
 }
-
-// Check determines if IPVS proxier can be used or not
-// No-op for for Darwin (MacOS).
-func (ipvspc IPVSProxierCheck) Check() (warnings, errors []error) {
-	return nil, nil
-}

cmd/kubeadm/app/preflight/checks_linux.go

@@ -21,10 +21,7 @@ package preflight
 import (
 	"github.com/pkg/errors"
 	"k8s.io/kubernetes/cmd/kubeadm/app/util"
-	"k8s.io/kubernetes/pkg/proxy/ipvs"
 	"k8s.io/utils/exec"
-
-	utilipset "k8s.io/kubernetes/pkg/util/ipset"
 )
 
 // Check validates if Docker is setup to use systemd as the cgroup driver.
@@ -43,13 +40,3 @@ func (idsc IsDockerSystemdCheck) Check() (warnings, errorList []error) {
 	}
 	return nil, nil
 }
-
-// Check determines if IPVS proxier can be used or not
-func (ipvspc IPVSProxierCheck) Check() (warnings, errors []error) {
-	ipsetInterface := utilipset.New(ipvspc.exec)
-	kernelHandler := ipvs.NewLinuxKernelHandler()
-	if _, err := ipvs.CanUseIPVSProxier(kernelHandler, ipsetInterface); err != nil {
-		return nil, []error{err}
-	}
-	return nil, nil
-}

cmd/kubeadm/app/preflight/checks_windows.go

@@ -54,9 +54,3 @@ func (ipuc IsPrivilegedUserCheck) Check() (warnings, errorList []error) {
 func (idsc IsDockerSystemdCheck) Check() (warnings, errorList []error) {
 	return nil, nil
 }
-
-// Check determines if IPVS proxier can be used or not
-// No-op for Windows.
-func (ipvspc IPVSProxierCheck) Check() (warnings, errors []error) {
-	return nil, nil
-}