Fix CloudDualStackNodeIPs feature-gate inconsistency

pkg/daemons/agent/agent_linux.go

@@ -123,12 +123,21 @@ func kubeletArgs(cfg *config.Agent) map[string]string {
 	if cfg.NodeName != "" {
 		argsMap["hostname-override"] = cfg.NodeName
 	}
-	if nodeIPs := util.JoinIPs(cfg.NodeIPs); nodeIPs != "" {
+	// If the embedded CCM is disabled, don't assume that dual-stack node IPs are safe.
+	// When using an external CCM, the user wants dual-stack node IPs, they will need to set the node-ip kubelet arg directly.
+	// This should be fine since most cloud providers have their own way of finding node IPs that doesn't depend on the kubelet
+	// setting them.
+	if cfg.DisableCCM {
 		dualStack, err := utilsnet.IsDualStackIPs(cfg.NodeIPs)
-		if err == nil && dualStack {
-			argsMap["feature-gates"] = util.AddFeatureGate(argsMap["feature-gates"], "CloudDualStackNodeIPs=true")
+		if err == nil && !dualStack {
+			argsMap["node-ip"] = cfg.NodeIP
+		}
+	} else {
+		// Cluster is using the embedded CCM, we know that the feature-gate will be enabled there as well.
+		argsMap["feature-gates"] = util.AddFeatureGate(argsMap["feature-gates"], "CloudDualStackNodeIPs=true")
+		if nodeIPs := util.JoinIPs(cfg.NodeIPs); nodeIPs != "" {
+			argsMap["node-ip"] = util.JoinIPs(cfg.NodeIPs)
 		}
-		argsMap["node-ip"] = nodeIPs
 	}
 	kubeletRoot, runtimeRoot, controllers := cgroups.CheckCgroups()
 	if !controllers["cpu"] {

pkg/daemons/control/server.go

@@ -313,6 +313,7 @@ func cloudControllerManager(ctx context.Context, cfg *config.Control) error {
 		"authentication-kubeconfig":    runtime.KubeConfigCloudController,
 		"node-status-update-frequency": "1m0s",
 		"bind-address":                 cfg.Loopback(false),
+		"feature-gates":                "CloudDualStackNodeIPs=true",
 	}
 	if cfg.NoLeaderElect {
 		argsMap["leader-elect"] = "false"

tests/integration/kubeflags/kubeflags_test.go

@@ -148,11 +148,12 @@ var _ = Describe("create a new cluster with kube-* flags", Ordered, func() {
 			It("should find cloud-controller-manager starting with"+
 				"\"--cloud-node,--cloud-node-lifecycle,--secure-port=0\" flags ", func() {
 				Eventually(func() error {
-					match, err := testutil.SearchK3sLog(server, "Running cloud-controller-manager --allocate-node-cidrs=true"+
-						" --authentication-kubeconfig=/var/lib/rancher/k3s/server/cred/cloud-controller.kubeconfig"+
-						" --authorization-kubeconfig=/var/lib/rancher/k3s/server/cred/cloud-controller.kubeconfig --bind-address=127.0.0.1 "+
+					match, err := testutil.SearchK3sLog(server, "Running cloud-controller-manager --allocate-node-cidrs=true "+
+						"--authentication-kubeconfig=/var/lib/rancher/k3s/server/cred/cloud-controller.kubeconfig "+
+						"--authorization-kubeconfig=/var/lib/rancher/k3s/server/cred/cloud-controller.kubeconfig --bind-address=127.0.0.1 "+
 						"--cloud-config=/var/lib/rancher/k3s/server/etc/cloud-config.yaml --cloud-provider=k3s --cluster-cidr=10.42.0.0/16 "+
-						"--configure-cloud-routes=false --controllers=*,-route,-cloud-node,-cloud-node-lifecycle --kubeconfig=/var/lib/rancher/k3s/server/cred/cloud-controller.kubeconfig "+
+						"--configure-cloud-routes=false --controllers=*,-route,-cloud-node,-cloud-node-lifecycle "+
+						"--feature-gates=CloudDualStackNodeIPs=true --kubeconfig=/var/lib/rancher/k3s/server/cred/cloud-controller.kubeconfig "+
 						"--leader-elect-resource-name=k3s-cloud-controller-manager --node-status-update-frequency=1m0s --profiling=false --secure-port=0")
 					if err != nil {
 						return err