ingress does not contain a valid IngressClass

litianxiang@C02GQ39QQ05P ingress-nginx % kubectl get ingressClass
NAME    CONTROLLER             PARAMETERS   AGE
nginx   k8s.io/ingress-nginx   <none>       17h


litixQQ05P /tmp % cat ingress_prometheus.yaml 
apiVersion: networking.k8s.io/v1
kind: Ingress  
metadata:
  name: prometheus-ingress
spec:
  ingressClassName: nginx     # hier
  rules:
  - host: "prometheus.int.xiaxshu.com"
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: prometheus-server
            port:
              number: 80

test

• 写本机 host
  ip domain
• 创建 ingress
  
• test