Programmatically detect Windows cluster configuration?

Question

Does anyone know how to programatically detect that a Windows server is part of a cluster?

Further, is it possible to detect that the server is the active or passive node?

[Edit] And detect it from Win32? A registry setting maybe?

Thanks for any insight.

Doug

Answer 1

Any specific language you're looking for?

You might be able to employ the failover cluster cmdlets for Powershell (for Windows Server 2008 R2). Specifically Get-Cluster and Get-ClusterNode

Answer 2

Go to msdn.microsoft.com, and search for 'Windows Clustering'.

There's a ton of information there.

Answer 3

I don't have an exact answer, but there are lots of APIs beginning with "Cluster" (like ClusterOpenEnum and ClusterNodeEnum) and COM interfaces beginning with "IGetCluster" that look promising.

Answer 4

You can use WMI to lookup the information. That should work from XP/Win32 etc.

There is some great information here on using VBScript to do the job: http://www.activexperts.com/activmonitor/windowsmanagement/scripts/networking/clustering/

Here's some C#/.Net code that also uses WMI:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System;
using System.Management;

namespace SandboxConsole
{
    public class ClusterAdmin
    {
     [MTAThread]
     public static void Main()
     {
      string clusterName = "MyCluster"; // cluster alias
      string custerGroupResource = "FS_Resource1"; // Cluster group name
      ConnectionOptions options = new ConnectionOptions();
      options.Username = "ClusterAdmin"; //could be in domain\user format
      options.Password = "HisPassword";

      // Connect with the mscluster WMI namespace on the cluster named "MyCluster"
      ManagementScope s = new ManagementScope("\\\\" + clusterName + "\\root\\mscluster", options);
      ManagementPath p = new ManagementPath("Mscluster_Clustergroup.Name='" + custerGroupResource + "'");

      using (ManagementObject clrg = new ManagementObject(s, p, null))
      {
       // Take clustergroup off line and read its status property when done
       TakeOffLine(clrg);
       clrg.Get();
       Console.WriteLine(clrg["Status"]);

       System.Threading.Thread.Sleep(3000); // Sleep for a while

       // Bring back online and get status.
       BringOnLine(clrg);
       clrg.Get();
       Console.WriteLine(clrg["Status"]);
      }
     }
     static void TakeOffLine(ManagementObject resourceGroup)
     {
      ManagementBaseObject outParams =
      resourceGroup.InvokeMethod("Takeoffline", null, null);
     }
     static void BringOnLine(ManagementObject resourceGroup)
     {
      ManagementBaseObject outParams =
      resourceGroup.InvokeMethod("Takeoffline", null, null);
     }
    }
}

I found this code here and tidied it up a little.