Host Network

✓ Guardrail Kubernetes Guardrails Stable Deployment And Infrastructure

k8s.host-network

Fails when workload PodSpecs set hostNetwork: true. Sharing the host's network namespace bypasses NetworkPolicy enforcement, exposes node-local services to the pod, and gives a compromised container direct access to the node's interfaces (and any cleartext traffic on them). Legitimate hostNetwork users (CNI agents, node-local proxies, host-bound exporters) can opt out via include/exclude in lunar-config.yml.

hostNetwork network namespace NetworkPolicy bypass container escape least privilege

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Compatible Integrations

This guardrail works with the following integrations. Click to see how to use Host Network with each collector.

Host Network + Kubernetes Collector Provides parsed K8s manifest data that these policies evaluate

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Enable This Guardrail

Add the parent policy to your lunar-config.yml to enable this guardrail.

📄 lunar-config.yml

policies:
  - uses: github://earthly/lunar-lib/policies/k8s@v1.0.5
    include: [host-network]
    # with: ...

How This Guardrail Works

This guardrail is part of the Kubernetes Guardrails policy. It evaluates data collected by integrations and produces a pass/fail check with actionable feedback.

When enabled, this check runs automatically on every PR and in AI coding workflows, providing real-time enforcement of your engineering standards.

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↓ Integrations Gather Data

Collectors extract metadata from code, CI pipelines, tool outputs, and scans

{ } Centralized as JSON

All data merged into each component's unified metadata document

✓ This Guardrail Checks Current

Host Network runs and provides pass/fail feedback

Configuration Options

These inputs can be configured in your lunar-config.yml to customize how the parent policy (and this guardrail) behaves.

Input	Required	Default	Description
`min_replicas`	Optional	`3`	Minimum replicas required for HPAs (default 3)
`max_limit_to_request_ratio`	Optional	`4`	Maximum ratio of limits to requests for CPU/memory (default 4)
`min_kubectl_version`	Optional	`1.28`	Minimum kubectl version required in CI (semver, e.g. "1.28")

Kubernetes Guardrails

This guardrail is part of the Kubernetes Guardrails policy, which includes 11 guardrails for deployment and infrastructure.

View Policy

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