KubeLinter

What KubeLinter is

KubeLinter is a free, open-source static analyzer for Kubernetes YAML files, Helm charts and Kustomize manifests. Its checks assess production-readiness and security practices, including whether containers run as non-root, privileges are limited, and sensitive information is stored in secrets. Users can enable or disable checks and define custom checks for organizational policies. When a check fails, KubeLinter provides remediation suggestions and returns a non-zero exit code. It can generate multiple output formats in one run, including SARIF and JSON. Documented installation routes include Go, release binaries, Homebrew or LinuxBrew, nix-shell and Docker. The project's container images are signed with cosign, and a public key is provided for verification; the README cautions that keyless cosign signatures are not production ready. The project was created by StackRox and is now powered by Red Hat. KubeLinter uses the Apache License 2.0, with no paid tiers listed. Its README also warns that commands, flags and configuration file formats may change. Users can join the project's Slack workspace to engage with maintainers and others.

Who it suits

KubeLinter suits teams checking Kubernetes configuration files and manifests against security and production-readiness practices. Custom checks can help align linting with an organization's policies.

Limits

The free plan is the Apache License 2.0 release, and no paid tiers are listed. The README warns that command usage, flags, and configuration file formats may change; keyless cosign signatures are not production ready.

Getting started

1. Choose an installation route: Go, release binary, Homebrew or LinuxBrew, nix-shell, or Docker.
2. Install on Linux or macOS, or use a self-hosted setup.
3. Run KubeLinter against Kubernetes YAML, Helm charts, or Kustomize manifests.
4. Review any failed checks, remediation recommendations, and the selected output format.

Verdict

KubeLinter offers configurable static checks for Kubernetes manifests, with output that can be used in automated workflows. Readers should account for the project's warning that its commands and configuration formats may change.