Implementing Container Network Policies With Calico

Name: Implementing Container Network Policies With Calico
Author: mukul975

ASecurity

Enforce Kubernetes network segmentation using Calico CNI network policies and global network policies to control

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Added 5/29/2026

securitypythonrustkubernetesgitapisecurity

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cliapi

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A100/100

Scanned 5/29/2026

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npx -y skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-container-network-policies-with-calico --agent claude-code

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SKILL.md

---
name: implementing-container-network-policies-with-calico
description: Enforce Kubernetes network segmentation using Calico CNI network policies and global network policies to control
  pod-to-pod traffic, restrict egress, and implement zero-trust microsegmentation.
domain: cybersecurity
subdomain: container-security
tags:
- container-security
- kubernetes
- calico
- network-policy
- microsegmentation
- cni
version: '1.0'
author: mahipal
license: Apache-2.0
nist_csf:
- PR.PS-01
- PR.IR-01
- ID.AM-08
- DE.CM-01
---
# Implementing Container Network Policies with Calico

## Overview

Calico provides Kubernetes-native and extended network policy enforcement through its CNI plugin. This 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.


## When to Use

- When deploying or configuring implementing container network policies with calico capabilities in your environment
- When establishing security controls aligned to compliance requirements
- When building or improving security architecture for this domain
- When conducting security assessments that require this implementation

## Prerequisites

- 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

## Steps

### Step 1: Audit Existing Network Policies
Use calicoctl and kubectl to inventory current network policies and identify unprotected namespaces.

### Step 2: Implement Default-Deny Policies
Create default-deny ingress and egress policies per namespace as a zero-trust baseline.

### Step 3: Create Workload-Specific Allow Rules
Define granular allow rules for legitimate pod-to-pod and pod-to-service communication.

### Step 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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--- name: implementing-container-network-policies-with-calico description: Enforce Kubernetes network segmentation using Calico CNI network policies and global network policies to control pod-to-pod traffic, restrict egress, and implement zero-trust microsegmentation. domain: cybersecurity subdomain: container-security tags: - container-security - kubernetes - calico - network-policy - microsegmentation - cni version: '1.0' author: mahipal license: Apache-2.0 nist_csf: - PR.PS-01 - PR.IR-01 - ID.AM-08 - DE.CM-01 --- # Implementing Container Network Policies with Calico ## Overview Calico provides Kubernetes-native and extended network policy enforcement through its CNI plugin. This 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. ## When to Use - When deploying or configuring implementing container network policies with calico capabilities in your environment - When establishing security controls aligned to compliance requirements - When building or improving security architecture for this domain - When conducting security assessments that require this implementation ## Prerequisites - 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 ## Steps ### Step 1: Audit Existing Network Policies Use calicoctl and kubectl to inventory current network policies and identify unprotected namespaces. ### Step 2: Implement Default-Deny Policies Create default-deny ingress and egress policies per namespace as a zero-trust baseline. ### Step 3: Create Workload-Specific Allow Rules Define granular allow rules for legitimate pod-to-pod and pod-to-service communication. ### Step 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.