Meet ClusterValidator

ClusterValidator answers one question: is this cluster healthy right now?

It reads cluster state over WMI/CIM and Active Directory, runs its checks, and reports what it found as JSON, CSV, or HTML. It is read-only. It does not evict nodes, force quorum, or change configuration, and that is deliberate.

What it validates

Windows Server Failover Clusters, including the SQL Server failover cluster instances it was originally written for. A run takes between 2 and 16 node names. It can also validate a set of servers before the cluster exists, which is the check most people wish they had run first.

It does not validate Kubernetes clusters or SQL Server Always On availability groups, and it needs network reachability to the nodes plus the Windows Failover Clustering feature. Windows only.

The free part

ClusterValidator runs with no license at all against 2 distinct clusters per calendar month. Validating a cluster you already counted this month never counts again, so revalidate as often as you like. Paid plans raise the cluster count; the current tiers are on the product page.

Where to get it

Three ways, depending on how you work. There is a container listing on AWS Marketplace. There is a free MCP server on NuGet and the PowerShell Gallery, so an AI agent can drive validation for you. And you can buy directly from us, in which case the signed license file arrives by email.

It works offline

The license verifies locally, on your machine, against a public key that ships with the product. At run time ClusterValidator makes no call to us. That matters because a cluster validator is most useful exactly when your network is having a bad day, and a tool that needs a license server is useless in that moment. The details are in how the offline licensing works.

No agent gets installed on your nodes, and nothing about your cluster leaves your network.