require 'rbvmomi'

hostname = '192.168.1.200';
username = 'user1@vsphere.local';
password = 'P@ssword123';
vim = RbVmomi::VIM.connect host: hostname, user: username, password: password, insecure: true;

rootFolder  = vim.serviceInstance.content.rootFolder
viewManager = vim.serviceInstance.content.viewManager
  viewManager.CreateContainerView(
      recursive: true, container: rootFolder, type: ['Datacenter']
  ).view.each{|dc|
    viewManager.CreateContainerView(
        recursive: true, container: dc, type: ['ComputeResource']
    ).view.each{|cluster|
      viewManager.CreateContainerView(
          recursive: true, container: cluster, type: ['VirtualMachine']
      ).view.
      select{|vm|
        vm.name =~ /desktop/
      }.
      each{|vm|
        puts "in datacenter #{dc.name}, cluster #{cluster.name}: vm #{vm.name}"
      }
    }
  }