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Polaris

Polaris is Fairwinds' Apache-2.0 tool that validates Kubernetes workloads against best practices as a dashboard, admission controller or CLI.

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Introduction

Polaris, from Fairwinds, validates best practices in Kubernetes clusters. It checks workload configuration for security, efficiency and reliability issues, and runs as a dashboard, an admission controller that can block non-compliant workloads, or a CLI for manifests in CI.

The source code is at FairwindsOps/polaris on GitHub under the Apache-2.0 licence, with about 3,400 stars; the most recent commit was on 11 November 2026.

Features

  1. Three modes: Dashboard, admission controller and CLI.
  2. Built-in checks: Security, reliability and efficiency.
  3. Custom checks: JSON Schema based.
  4. Exemptions: Per-workload exceptions.
  5. CI use: Audit manifests before deploy.

Pros

  1. Free to use: Open source under Apache-2.0.
  2. Maintained: Commits as recent as 11 November 2026.
  3. Community: About 3,400 GitHub stars.

Cons

  1. Configuration only: Not a vulnerability scanner.
  2. Admission control risk: Blocking rules need care.
polaris audit --audit-path ./manifests --set-exit-code-on-danger

Resources:

Pricing

Polaris is free and open source under the Apache-2.0 licence.

  1. Platform teams enforcing workload standards.
  2. CI pipelines auditing manifests.
  3. Not a fit for image CVEs.

Conclusion

Polaris enforces Kubernetes best practices from CI to admission control.

Alternatives

Other tools on CheckOps that cover similar ground. Open a page, or compare one with Polaris side by side.