Kubernetes通过Ingress-nginx设置重定向

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-rewrite-target
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: http://www.a.com
spec:
  rules:
  - host: a.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-svc
          servicePort: 80