Merge pull request #61077 from islinwb/fix_ipvs_warninfo

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Init ipvsInterface only when ipvs modules are present

**What this PR does / why we need it**:

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #61074 

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

cmd/kube-proxy/app/server_others.go

@@ -90,9 +90,11 @@ func newProxyServer(
 
 	dbus = utildbus.New()
 	iptInterface = utiliptables.New(execer, dbus, protocol)
-	ipvsInterface = utilipvs.New(execer)
 	kernelHandler = ipvs.NewLinuxKernelHandler()
 	ipsetInterface = utilipset.New(execer)
+	if canUse, _ := ipvs.CanUseIPVSProxier(kernelHandler, ipsetInterface); canUse {
+		ipvsInterface = utilipvs.New(execer)
+	}
 
 	// We omit creation of pretty much everything if we run in cleanup mode
 	if cleanupAndExit {

pkg/proxy/ipvs/proxier.go

@@ -547,6 +547,9 @@ func cleanupIptablesLeftovers(ipt utiliptables.Interface) (encounteredError bool
 
 // CleanupLeftovers clean up all ipvs and iptables rules created by ipvs Proxier.
 func CleanupLeftovers(ipvs utilipvs.Interface, ipt utiliptables.Interface, ipset utilipset.Interface, cleanupIPVS bool) (encounteredError bool) {
+	if canUse, _ := CanUseIPVSProxier(NewLinuxKernelHandler(), ipset); !canUse {
+		return false
+	}
 	if cleanupIPVS {
 		// Return immediately when ipvs interface is nil - Probably initialization failed in somewhere.
 		if ipvs == nil {