[root@k8s-master-node1 ~]# cat istio.yaml apiVersion: networking.istio.io/v1alpha3 kind: Sidecar metadata: name: default namespace: prod-us1 spec: egress: - hosts: - "prod-us1.default" - "prod-apis.default" - "istio-system.default"Error from server: error when creating "istio.yaml": admission webhook "validation.istio.io" denied the request: configuration is invalid: 3 errors occurred: * host must be of form namespace/dnsName * host must be of form namespace/dnsName * host must be of form namespace/dnsName

这个错误提示是因为你在配置 Istio 的 egress 时，hosts 的格式不正确。host 必须是 namespace/dnsName 的形式。你可以像下面这样修改：

apiVersion: networking.istio.io/v1alpha3
kind: Sidecar
metadata:
  name: default
  namespace: prod-us1
spec:
  egress:
  - hosts:
    - "default/prod-us1"
    - "default/prod-apis"
    - "default/istio-system"

这样修改后再试一下就应该没有问题了。