作为空白数组的入口值和值 - {} 有什么区别？

Question

在 kubernetes 网络策略中，我们可以将 Ingress 值设置为空白数组，即 [] 或者我们也可以将值设置为 - {}

使用这两个值有什么区别？

我尝试的第一个 YAML - 它没有用

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: internal-policy
spec:
  podSelector:
    matchLabels:
      name: internal
  policyTypes: ["Ingress","Egress"]
  ingress: []
  egress:
  - to:
    - podSelector:
        matchLabels:
          name: mysql
    ports:
    - protocol: TCP
      port: 3306

在 katacoda 场景中回答的第二个 YAML

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: internal-policy
  namespace: default
spec:
  podSelector:
    matchLabels:
      name: internal
  policyTypes:
  - Egress
  - Ingress
  ingress:
    - {}
  egress:
  - to:
    - podSelector:
        matchLabels:
          name: mysql
    ports:
    - protocol: TCP
      port: 3306

Answer 1

在这两种情况下，您都指定了策略类型：入口和出口

1. 在第一个例子中：

     ingress: []

此规则（为空）和拒绝所有入口流量，（如果入口规则不在规范中，结果相同）。

您可以通过运行验证这一点：

kubectl describe networkpolicy internal-policy 

Allowing ingress traffic:
    <none> (Selected pods are isolated for ingress connectivity)

2. 在第二个例子中：

     ingress:
        - {}

这条规则允许所有入口流量:

kubectl describe networkpolicy internal-policy 

 Allowing ingress traffic:
    To Port: <any> (traffic allowed to all ports)
    From: <any> (traffic not restricted by source)

根据文档：Network Policies

Ingress rules: Each NetworkPolicy may include a list of whitelist ingress rules. Each rule allows traffic which matches both the from and ports sections.

希望对您有所帮助。