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buun-stack/fairwinds-polaris/README.md
Masaki Yatsu 189a376511 feat(fairwinds-polaris): install Fairwinds Polaris
2025-11-10 13:48:27 +09:00

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Fairwinds Polaris

Fairwinds Polaris is a Kubernetes security audit tool that validates cluster configurations against best practices.

Features

  • Dashboard for visualizing security audit results
  • Checks for security, efficiency, and reliability issues
  • Customizable security policies
  • Support for exemptions
  • Real-time cluster scanning

Prerequisites

  • Kubernetes cluster (k3s)
  • Helm 3
  • kubectl configured

Installation

Install Fairwinds Polaris with interactive configuration:

just fairwinds-polaris::install

During installation, you will be prompted to:

  1. Enable Ingress?

    • Yes: Expose via Ingress (requires FQDN)
    • No: Access via port-forward (recommended for development)

  2. Enable OAuth2 Proxy authentication? (only if Ingress is enabled)

    • Yes: Keycloak SSO authentication
    • No: Public access without authentication

Access Options

Ingress (if enabled):

  • Without OAuth2 Proxy: Direct access via https://fairwinds-polaris.yourdomain.com
  • With OAuth2 Proxy: Keycloak authentication required via https://fairwinds-polaris.yourdomain.com

Port-forward (without Ingress):

just fairwinds-polaris::port-forward
# Opens on http://localhost:8080

Usage

View Audit Results

Port-forward to dashboard:

just fairwinds-polaris::port-forward

Or fetch JSON results:

just fairwinds-polaris::audit

Upgrade

just fairwinds-polaris::upgrade

Uninstall

just fairwinds-polaris::uninstall

Configuration

Configuration is managed through values.gomplate.yaml.

Security Checks

Polaris performs the following security checks:

  • Security

    • hostIPCSet: danger
    • hostPIDSet: danger
    • notReadOnlyRootFilesystem: warning
    • privilegeEscalationAllowed: danger
    • runAsRootAllowed: warning
    • runAsPrivileged: danger
    • insecureCapabilities: warning
    • dangerousCapabilities: danger

  • Efficiency

    • cpuRequestsMissing: warning
    • cpuLimitsMissing: warning
    • memoryRequestsMissing: warning
    • memoryLimitsMissing: warning

  • Reliability

    • tagNotSpecified: danger
    • readinessProbeMissing: warning
    • livenessProbeMissing: warning
    • deploymentMissingReplicas: ignore (disabled)

  • Network

    • hostNetworkSet: warning
    • hostPortSet: warning
    • missingNetworkPolicy: warning

Exemptions

System components are pre-configured with exemptions:

  • kube-system controllers
  • Monitoring tools (Prometheus, Grafana)
  • Networking components (Flannel, Calico)

Environment Variables

Variable Default Description
FAIRWINDS_POLARIS_NAMESPACE fairwinds-polaris Kubernetes namespace
FAIRWINDS_POLARIS_CHART_VERSION 5.19.0 Helm chart version
FAIRWINDS_POLARIS_HOST - FQDN for Ingress (when enabled)
FAIRWINDS_POLARIS_INGRESS_ENABLED false Enable Ingress
KEYCLOAK_REALM buunstack Keycloak realm
KEYCLOAK_HOST - Keycloak host

Understanding Results

Polaris categorizes issues by severity:

  • 🔴 Danger: Critical security issues
  • 🟡 Warning: Important but not critical
  • 🟢 Success: Passed all checks

Score Calculation

Each check has a severity level that contributes to the overall score:

  • Danger: -10 points
  • Warning: -1 point
  • Success: +1 point

Best Practices

  1. Regular Scanning: Run Polaris regularly to catch configuration drift
  2. Address Dangers First: Focus on danger-level issues before warnings
  3. Review Exemptions: Periodically review exempted resources
  4. CI/CD Integration: Consider integrating Polaris into your deployment pipeline

Troubleshooting

Dashboard Not Accessible

Check if the service is running:

kubectl get pods -n polaris
kubectl get svc -n polaris

Port-forward Fails

Ensure the dashboard service is ready:

kubectl get svc polaris-dashboard -n polaris

Ingress Not Working

Check IngressRoute and OAuth2 Proxy:

kubectl get ingressroute -n polaris
kubectl get pods -n polaris | grep oauth2-proxy

References