Fairwinds Polaris vs Monokle

Fairwinds Polaris is an open source policy engine for validating and remediating Kubernetes resource configuration. It includes more than 30 built-in policies, and teams can add their own using JSON Schema. Checks cover security practices such as least privilege, privilege escalation, root execution, and host IPC or PID settings, along with resource requests and limits, readiness and liveness probes, and image tags. Polaris can run as a dashboard, an admission controller, or a command-line tool for checking local YAML files in CI/CD. Its validating webhook rejects workloads that trigger danger-level checks; warning-level findings pass and appear in the dashboard or webhook logs. A mutating webhook or command-line run can automatically remediate supported issues, including missing limits and probes and some unsafe security settings. The dashboard can audit local files or connect to a live cluster, and can be installed with kubectl or Helm. The validating webhook requires a valid TLS certificate. Polaris is free and runs on Linux, macOS, Windows, web, and self-hosted environments.

Monokle Desktop is a free IDE for creating, exploring, and validating Kubernetes YAML configurations. It supports template-based resource creation, forms, Kubernetes-aware editing, schemas, and CRDs. Users can compare Git branches or repositories, resources across namespaces and clusters, and local configuration with the state of a running cluster. Real-time validation makes configuration issues visible; custom policies and output from CLI tools can also be checked. Helm charts and Kustomize overlays can be dry-run and previewed before deployment. For cluster inspection, Monokle can show resources, dependencies, Kubernetes events, and pod logs to help with troubleshooting. Listed integrations include Flux, Argo CD, Istio CRDs, Cert-Manager CRDs, Sealed Secrets, CDK8s, Tanka, and KPT. The download page describes it as a manifest creation, validation, and compliance IDE for developers, as well as a cluster inspection and troubleshooting tool for SREs. Monokle Desktop is available for Linux, macOS, and Windows. Kubeshop announced that Monokle Cloud and its accompanying GitHub app would be shut down, while open-source products would continue in their GitHub repositories.