implementing-container-network-policies-with-calico

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. Use when working with implementing container network policies with calico.
domain	cybersecurity
subdomain	container-security
tags	["container-security","kubernetes","calico","network-policy","microsegmentation","cni"]
version	1.0
author	oyi77
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

Trigger phrases:

• "implementing container network policies with calico"

• "Enforce Kubernetes network segmentation using Calico CNI network policies and gl"

• 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

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text) for k, v in IOC_PATTERNS.items()}

1. Scope the task — define objectives, boundaries, and success criteria
2. Gather information — collect all necessary data and context before proceeding
3. — follow the domain-specific steps methodically