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65 lines
1.4 KiB
Markdown
65 lines
1.4 KiB
Markdown
# API Reference: Implementing Kubernetes Network Policy with Calico
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## Kubernetes NetworkPolicy
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```yaml
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apiVersion: networking.k8s.io/v1
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kind: NetworkPolicy
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metadata:
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name: default-deny-all
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namespace: production
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spec:
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podSelector: {}
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policyTypes: [Ingress, Egress]
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```
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## Calico GlobalNetworkPolicy
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```yaml
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apiVersion: projectcalico.org/v3
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kind: GlobalNetworkPolicy
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metadata:
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name: deny-external
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spec:
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order: 100
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selector: app == "backend"
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types: [Ingress]
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ingress:
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- action: Deny
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source:
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nets: ["0.0.0.0/0"]
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```
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## calicoctl CLI
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```bash
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# Apply policy
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calicoctl apply -f policy.yaml
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# Get policies
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calicoctl get globalnetworkpolicy -o yaml
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# Get host endpoints
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calicoctl get hostendpoint
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```
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## Policy Types
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| Type | Scope | Ordering |
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|------|-------|----------|
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| NetworkPolicy | Namespace | Additive (OR) |
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| GlobalNetworkPolicy | Cluster-wide | Ordered by `order` field |
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## Common Policy Patterns
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| Pattern | Description |
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|---------|-------------|
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| Default deny | Empty podSelector, no rules |
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| Allow DNS | Egress to kube-system UDP/TCP 53 |
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| Allow ingress from namespace | namespaceSelector match |
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| Allow to external CIDR | ipBlock in egress |
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### References
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- Calico Docs: https://docs.tigera.io/calico/
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- K8s NetworkPolicy: https://kubernetes.io/docs/concepts/services-networking/network-policies/
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- Calico Policy Tutorial: https://docs.tigera.io/calico/latest/network-policy/
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