Implementing Container Network Policies
FreeEnhance Kubernetes security with Calico network policies.
Free · Opens the source repo
What Implementing Container Network Policies does
The Implementing Container Network Policies with Calico skill is designed for Kubernetes environments that require robust network segmentation and security controls. By leveraging Calico's capabilities, this skill allows users to create and audit NetworkPolicy and GlobalNetworkPolicy resources, which are essential for controlling pod-to-pod traffic, implementing namespace isolation, and enforcing egress restrictions. The skill utilizes both calicoctl and the Kubernetes API to facilitate these processes, making it a valuable tool for DevOps and security teams focused on maintaining a secure Kubernetes infrastructure.
This skill is particularly useful when implementing zero-trust microsegmentation strategies within a Calico-CNI cluster. It guides users through the steps necessary to audit existing network policies, create default-deny policies, and define granular allow rules tailored to specific workloads. The ability to validate policy enforcement ensures that the implemented rules are functioning as intended, providing peace of mind for teams concerned with compliance and security best practices.
Ideal for developers and security professionals, this skill is essential when deploying new applications in Kubernetes or when conducting security assessments. It helps ensure that network policies align with compliance requirements and security architecture standards. With the increasing importance of container security, having a tool that simplifies the management of network policies is crucial for maintaining a secure operational environment.
In summary, this skill streamlines the process of implementing and auditing network policies in Kubernetes, making it an indispensable resource for anyone responsible for container security and network management.
When to use it
Use this skill when deploying or configuring network policies in a Kubernetes environment that utilizes Calico.
When not to use it
This skill is not suitable for environments without Kubernetes or Calico installed, or for users unfamiliar with network policy concepts.
What you can build with it
Deploying a New Application
When deploying a new application in Kubernetes, use this skill to set up network policies that secure pod communication.
Conducting a Security Assessment
Utilize this skill to audit existing network policies and ensure compliance with security standards during assessments.
Implementing Zero-Trust Architecture
Apply this skill to create default-deny policies and granular allow rules as part of a zero-trust microsegmentation strategy.
How to install Implementing Container Network Policies
View source1. Install with the skills CLI
npx skills add mukul975/anthropic-cybersecurity-skills/implementing-container-network-policies-with-calico --agent claude-code2. Or install it manually
Download the skill folder and drop it into ~/.claude/skills/ for all projects, or .claude/skills/ to scope it to one repo. Restart Claude Code so it picks up the new skill.
Anthropic's agentic coding CLI, and the reference implementation of Agent Skills. Drop a skill folder into ~/.claude/skills and Claude Code loads it automatically whenever a task matches the skill's description. Claude Code docs
Inside SKILL.md
Written by mukul975Implementing 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
kubernetesclient 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.
Frequently asked questions about Implementing Container Network Policies
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