gistfile1.rb

name = 'mp-tst-02'

    vim = @compute.instance_variable_get :@connection

    rootFolder = vim.serviceInstance.content.rootFolder
    propertyCollector = vim.serviceInstance.content.propertyCollector

    # Traversal to get to the vmFolder from DataCenter
    dataCenterToVMFolder = RbVmomi::VIM::TraversalSpec(
      :name => 'DataCenterToVMFolder',
      :type => 'Datacenter',
      :path => 'vmFolder',
      :skip => false,
      :selectSet => [ RbVmomi::VIM::SelectionSpec(:name => 'VisitFolders') ]
    );

    # TraversalSpec to get to the DataCenter from rootFolder
    traversalSpec = RbVmomi::VIM::TraversalSpec(
      :name => 'VisitFolders',
      :type => 'Folder',
      :path => 'childEntity',
      :skip => false,
      :selectSet => [ RbVmomi::VIM::SelectionSpec(:name => 'VisitFolders'), dataCenterToVMFolder]
    )

    propertySpec = RbVmomi::VIM::PropertySpec(
      :all => false,
      :pathSet => ['name'],
      :type => 'VirtualMachine',
    )

    objectSpec = RbVmomi::VIM::ObjectSpec(
      :obj => rootFolder,
      :skip => true,
      :selectSet => [traversalSpec]
    )

    propertyFilterSpec = RbVmomi::VIM::PropertyFilterSpec(
      :objectSet => [objectSpec],
      :propSet    => [propertySpec],
    )

    results = propertyCollector.RetrieveProperties :specSet => [propertyFilterSpec]
    vm = results.find do |r|
      name_prop = r.props[:propSet].find {|x| x.name == 'name'}
      name_prop.val == name
    end.obj

    p vm
vm.PowerOnVM_Task