官方文档地址:https://kubernetes.io/docs/concepts/services-networking/ingress/#ingress-class
方法一:
在ingressclass配置中添加注解
annotations:
ingressclass.kubernetes.io/is-default-class: "true"
方法二(此方法针对nginx-controller):
修改ingress-nginx-controller的deployment配置,新增启动参数
--watch-ingress-without-class=true