func createHosts(kubeClient kube.CLIClient, istioNamespace, ingressIP, dir string, revision string) error {
	// try to infer the ingress IP if the provided one is invalid
	if agent.ValidateIPAddress(ingressIP) != nil {
		p := strings.Split(ingressSvc, ".")
		ingressNs := istioNamespace
		if len(p) == 2 {
			ingressSvc = p[0]
			ingressNs = p[1]
		}