网络策略calico原创
# kubernetes NetworkPolicy
https://kubernetes.io/docs/concepts/services-networking/network-policies/
# calico NetworkPolicy
https://docs.projectcalico.org/reference/resources/globalnetworkpolicy
---
apiVersion: projectcalico.org/v3
kind: GlobalNetworkPolicy
metadata:
name: global-default
spec:
egress:
- action: Allow
destination: {}
source: {}
ingress:
- action: Allow
destination: {}
source: {}
order: 9999
types:
- Ingress
- Egress
---
apiVersion: projectcalico.org/v3
kind: GlobalNetworkPolicy
metadata:
name: global-egress-deny
spec:
egress:
- action: Deny
destination:
selector: area == 'dummy'
source: {}
namespaceSelector: (! has(privileged-namespace))
order: 502
types:
- Egress
---
apiVersion: projectcalico.org/v3
kind: GlobalNetworkPolicy
metadata:
name: global-egress-allow
spec:
egress:
- action: Allow
destination:
nets:
- 127.0.0.1/32
source:
namespaceSelector: name == "dummy"
order: 501
types:
- Egress
---
apiVersion: projectcalico.org/v3
kind: GlobalNetworkPolicy
metadata:
name: global-privileged-namespace
spec:
egress:
- action: Allow
destination: {}
source: {}
ingress:
- action: Allow
destination: {}
source: {}
namespaceSelector: has(privileged-namespace)
order: 500
types:
- Ingress
- Egress
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# 网络策略隔离限制问题
- 默认情况下,发送到service的数据包Type=LoadBalancer/NodePort会经过SNAT,会导致网络策略不生效
- 网络策略不能限制主机访问,即便设置了所有网段拒绝。 (Traffic from a host to its workload endpoints (e.g. Kubernetes pods) is always allowed, despite any policy in place. This ensures that kubelet liveness and readiness probes always work.)
# 关于源地址问题:
- 集群内通过podip访问一定不会SNAT
- 集群内通过clusterIP访问默认不会SNAT
- nodeport和LB默认会SNAT (网络策略可能会无法命中)
- externalTrafficPolicy: Cluster (默认) nodeport: 在集群内访问看到的IP是请求的节点IP,ep是轮训的 在集群外访问看到的IP是请求的节点IP,ep是轮训的 LB: 集群内访问看到的都是当前pod所在节点IP,ep是轮训的 集群外请求三次都是看到的节点1(固定)的IP,ep是轮训的
- externalTrafficPolicy: local nodeport: 集群内访问请求IP与当前pod节点一致时看到的是podIP,否则是当前pod所在节点IP,ep同节点 (??????) 在集群外访问看到的是真实的IP,ep对应请求的节点IP LB: 集群内访问看到的都是真实的IP(当前podIP),ep同节点 集群外请求三次都是真实的IP,ep同节点
# 建议:
建议在服务配置中将 spec.externalTrafficPolicy 设置为 local,以便数据包的源地址保持不变,即数据包的源地址就是客户端的源地址。
上次更新: 2022/08/24, 18:07:47