Implementing Container Network Policies with Calico

Genel Bakış

Calico provides Kubernetes-native and extended network policy enforcement through its CNI plugin. bu skill covers creating and auditing Calico NetworkPolicy and GlobalNetworkPolicy resources to implement pod-to-pod traffic control, namespace isolation, egress restrictions, and DNS-based policy rules using calicoctl and the Kubernetes API.

Ne Zaman Kullanılır

• Dağıt:ing yaparken or configuring implementing container network policies with calico capabilities in your environment
• establishing yaparken: security controls aligned to compliance requirements
• building yaparken or improving security architecture for this domain
• conducting yaparken security assessments that require this implementation

Ön Gereksinimler

• Kubernetes cluster with Calico CNI installed
• Python 3.9+ with kubernetes client library
• calicoctl CLI tool installed and configured
• kubectl access with RBAC permissions for network policy management

Adımlar

Adım 1: Audit Existing Network Policies

Use calicoctl and kubectl to inventory current network policies and identify unprotected namespaces.

Adım 2: Implement Default-Deny Policies

Create default-deny ingress and egress policies per namespace as a zero-trust baseline.

Adım 3: Create Workload-Specific Allow Rules

Define granular allow rules for legitimate pod-to-pod and pod-to-service communication.

Adım 4: Validate Policy Enforcement

Test connectivity between pods to verify policies are correctly enforced.

Expected Output

JSON audit report listing all network policies, unprotected namespaces, policy rule counts, and connectivity test results.

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