Merge pull request #26264 from luxas/remove_flannel_default

Automatic merge from submit-queue

Do not call NewFlannelServer() unless flannel overlay is enabled

Ref: #26093 

This makes so kubelet does not warn the user that iptables isn't in PATH, although the user didn't enable the flannel overlay.

@vishh @freehan @bprashanth

pkg/kubelet/kubelet.go

@@ -353,7 +353,7 @@ func NewMainKubelet(
 		daemonEndpoints:            daemonEndpoints,
 		containerManager:           containerManager,
 		flannelExperimentalOverlay: flannelExperimentalOverlay,
-		flannelHelper:              NewFlannelHelper(),
+		flannelHelper:              nil,
 		nodeIP:                     nodeIP,
 		clock:                      util.RealClock{},
 		outOfDiskTransitionFrequency: outOfDiskTransitionFrequency,
@@ -363,6 +363,7 @@ func NewMainKubelet(
 	}
 
 	if klet.flannelExperimentalOverlay {
+		klet.flannelHelper = NewFlannelHelper()
 		glog.Infof("Flannel is in charge of podCIDR and overlay networking.")
 	}
 	if klet.nodeIP != nil {