Virtual Geek

Currently I am doing complete VMware environment upgrade in my office in terms of hardware as well, After few plans I found most of my Esxi servers in VMWare clusters in my office were over committed. First question was by my boss was how do we perform it without degrading current VMs performance. To tackle this we had few spare esxi servers, which we utilized for this purpose. Adding this Esxi to existing cluster, after adding them to clusters, there was another concern of EVC (Vmware Enhanced vMotion compatibilty), to address this I already had written separate script and article Powercli GUI: Determine the EVC Mode that vmware cluster should be configured. 

Everything was going good, but while putting a ESXi host into maintenance mode and initiating multiple vMotion once at a time I observed slowness on VMs accessing them over the network, there was also slowness between application in terms of network (for example when heavy I/O intending application trying to read/write backend database also backups over networks slowing down), This was specifically happening on the little bit legacy Esxi servers and they were still using 1 Gig network adapters. Multiple vMotion were saturating complete network bandwidth.

This is helping me in the scenario when I add new empty ESXi and vacate esxi with one go, also I wanted a virtual machine to be migrated one at a time, once previous vMotion finished. Also on few clusters DRS (distributed resource sceduler) was not available, I wrote this graphical powercli script, using .net winforms, After executing it graphical user interface looks like below.

After execution of this GUI essentially it first asks for vCenter to login, Once login is successful, It shows complete list of Clusters on the vCenter server, After choosing cluster it shows the ESXi server in Source and destination ESXi server along with VMs list from Source Esxi, Make your selection here on source and destination ESXi and click button Migrate-VMs, this will start emptying out Source Esxi and migrate VMs to destination esxi host, Once task is completed you can easily logoff from vCenter server and close tool.

To run this script there are certain requirements, I wrote and tested it on Windows 10, also used PowerCLI version 6.5 with PrimalForms community edition.
VMWARE VSPHERE POWERCLI INSTALLATION AND CONFIGURATION STEP BY STEP
POWERCLI INITIALIZE-POWERCLI ENVIRONMENT.PS1 CANNOT BE LOADED BECAUSE RUNNING SCRIPTS IS DISABLED 

You can download this script here also This powercli script is available on Github.com

 #Designed and created by Kunal: http://vcloud-lab.com   
 #Tools used  
   #Windows 10  
   #Powercli 6.5  
   #PrimalForms Community Edition  
   
 #region Import the Assemblies  
 [reflection.assembly]::loadwithpartialname("System.Drawing") | Out-Null  
 [reflection.assembly]::loadwithpartialname("System.Windows.Forms") | Out-Null  
 #endregion  
   
 #region Generated Form Objects  
 $vCenterForm = New-Object System.Windows.Forms.Form  
 $vcloudurl = New-Object System.Windows.Forms.LinkLabel  
 $LastVM = New-Object System.Windows.Forms.Label  
 $listlabel = New-Object System.Windows.Forms.Label  
 $CurrentVM = New-Object System.Windows.Forms.Label  
 $RemCount = New-Object System.Windows.Forms.Label  
 $RemainingCount = New-Object System.Windows.Forms.Label  
 $dataGrid1 = New-Object System.Windows.Forms.DataGrid  
 $DestEsxiLabel = New-Object System.Windows.Forms.Label  
 $ESXiInfo = New-Object System.Windows.Forms.Button  
 $MigrateVM = New-Object System.Windows.Forms.Button  
 $logoffvcenter = New-Object System.Windows.Forms.Button  
 $SourceEsxiLabel = New-Object System.Windows.Forms.Label  
 $DestinationEsxi = New-Object System.Windows.Forms.ComboBox  
 $SourceEsxi = New-Object System.Windows.Forms.ComboBox  
 $ClusterList01 = New-Object System.Windows.Forms.CheckedListBox  
 $vCenterServer = New-Object System.Windows.Forms.TextBox  
 $statusBar1 = New-Object System.Windows.Forms.StatusBar  
 $LoginvCenter = New-Object System.Windows.Forms.Button  
 $InitialFormWindowState = New-Object System.Windows.Forms.FormWindowState  
 $Info = New-Object System.Windows.Forms.Label  
   
 #----------------------------------------------  
 #region Generated Form Code  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 540  
 $System_Drawing_Size.Width = 659  
 $vCenterForm.ClientSize = $System_Drawing_Size  
 $vCenterForm.DataBindings.DefaultDataSourceUpdateMode = 0  
 $vCenterForm.Name = "vCenterForm"  
 $vCenterForm.Text = "Migrate VMs from one ESXi to another"  
   
 $Info.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 517  
 $System_Drawing_Point.Y = 88  
 $Info.Location = $System_Drawing_Point  
 $Info.Name = "Info"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 33  
 $System_Drawing_Size.Width = 75  
 $Info.Size = $System_Drawing_Size  
 $Info.TabIndex = 17  
 $Info.Text = "Windows 10  Powercli 6.5"  
 $Info.add_Click($handler_label1_Click)  
   
 $vCenterForm.Controls.Add($Info)  
   
 $vcloudurl.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 478  
 $System_Drawing_Point.Y = 486  
 $vcloudurl.Location = $System_Drawing_Point  
 $vcloudurl.Name = "vcloudurl"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 23  
 $System_Drawing_Size.Width = 114  
 $vcloudurl.Size = $System_Drawing_Size  
 $vcloudurl.TabIndex = 15  
 $vcloudurl.TabStop = $True  
 $vcloudurl.Text = "http://vcloud-lab.com"  
 $vcloudurl.add_Click({[system.Diagnostics.Process]::start('http://vcloud-lab.com')})   
 $vCenterForm.Controls.Add($vcloudurl)  
   
 $logoffvcenter.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 13  
 $System_Drawing_Point.Y = 485  
 $logoffvcenter.Location = $System_Drawing_Point  
 $logoffvcenter.Name = "logoffvcenter"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 23  
 $System_Drawing_Size.Width = 127  
 $logoffvcenter.Size = $System_Drawing_Size  
 $logoffvcenter.TabIndex = 16  
 $logoffvcenter.Text = "LogOff-vCenter"  
 $logoffvcenter.UseVisualStyleBackColor = $True  
 $logoffvcenter.add_Click($logoffvcenter_OnClick)  
   
 $vCenterForm.Controls.Add($logoffvcenter)  
   
 $LastVM.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 147  
 $System_Drawing_Point.Y = 406  
 $LastVM.Location = $System_Drawing_Point  
 $LastVM.Name = "LastVM"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 29  
 $System_Drawing_Size.Width = 446  
 $LastVM.Size = $System_Drawing_Size  
 $LastVM.TabIndex = 13  
 $LastVM.Text = "Last VM Migrated"  
 $LastVM.Font = 'Microsoft Sans Serif,14'  
   
 $vCenterForm.Controls.Add($LastVM)  
   
 $CurrentVM.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 146  
 $System_Drawing_Point.Y = 339  
 $CurrentVM.Location = $System_Drawing_Point  
 $CurrentVM.Name = "CurrentVM"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 54  
 $System_Drawing_Size.Width = 446  
 $CurrentVM.Size = $System_Drawing_Size  
 $CurrentVM.TabIndex = 12  
 $CurrentVM.Text = "Current VM"  
 $CurrentVM.Font = 'Microsoft Sans Serif,16'  
   
 $vCenterForm.Controls.Add($CurrentVM)  
   
 $RemCount.BackColor = [System.Drawing.Color]::FromArgb(255,0,192,192)  
 $RemCount.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 13  
 $System_Drawing_Point.Y = 380  
 $RemCount.Location = $System_Drawing_Point  
 $RemCount.Name = "RemCount"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 103  
 $System_Drawing_Size.Width = 127  
 $RemCount.Size = $System_Drawing_Size  
 $RemCount.TabIndex = 11  
 $RemCount.Text = 0  
 $RemCount.TextAlign = 32  
 $RemCount.Font = 'Microsoft Sans Serif,40'  
   
 $vCenterForm.Controls.Add($RemCount)  
   
 $RemainingCount.BackColor = [System.Drawing.Color]::FromArgb(255,0,128,128)  
 $RemainingCount.DataBindings.DefaultDataSourceUpdateMode = 0  
 $RemainingCount.ForeColor = [System.Drawing.Color]::FromArgb(255,255,255,255)  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 13  
 $System_Drawing_Point.Y = 339  
 $RemainingCount.Location = $System_Drawing_Point  
 $RemainingCount.Name = "RemainingCount"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 41  
 $System_Drawing_Size.Width = 127  
 $RemainingCount.Size = $System_Drawing_Size  
 $RemainingCount.TabIndex = 10  
 $RemainingCount.Text = "Remaing VMs count to migrate"  
 $RemainingCount.TextAlign = 32  
   
 $vCenterForm.Controls.Add($RemainingCount)  
   
 $dataGrid1.DataBindings.DefaultDataSourceUpdateMode = 0  
 $dataGrid1.DataMember = ""  
 $dataGrid1.HeaderForeColor = [System.Drawing.Color]::FromArgb(255,0,0,0)  
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 12  
 $System_Drawing_Point.Y = 213  
 $dataGrid1.Location = $System_Drawing_Point  
 $dataGrid1.Name = "dataGrid1"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 119  
 $System_Drawing_Size.Width = 581  
 $dataGrid1.Size = $System_Drawing_Size  
 $dataGrid1.TabIndex = 9  
   
 $vCenterForm.Controls.Add($dataGrid1)  
   
 $DestEsxiLabel.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 90  
 $System_Drawing_Point.Y = 186  
 $DestEsxiLabel.Location = $System_Drawing_Point  
 $DestEsxiLabel.Name = "DestEsxiLabel"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 23  
 $System_Drawing_Size.Width = 139  
 $DestEsxiLabel.Size = $System_Drawing_Size  
 $DestEsxiLabel.TabIndex = 8  
 $DestEsxiLabel.Text = "Destination ESXi server"  
   
 $vCenterForm.Controls.Add($DestEsxiLabel)  
   
 $SourceEsxiLabel.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 90  
 $System_Drawing_Point.Y = 158  
 $SourceEsxiLabel.Location = $System_Drawing_Point  
 $SourceEsxiLabel.Name = "SourceEsxiLabel"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 23  
 $System_Drawing_Size.Width = 139  
 $SourceEsxiLabel.Size = $System_Drawing_Size  
 $SourceEsxiLabel.TabIndex = 7  
 $SourceEsxiLabel.Text = "Source ESXi server"  
   
 $vCenterForm.Controls.Add($SourceEsxiLabel)  
   
 $DestinationEsxi.DataBindings.DefaultDataSourceUpdateMode = 0  
 $DestinationEsxi.FormattingEnabled = $True  
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 235  
 $System_Drawing_Point.Y = 186  
 $DestinationEsxi.Location = $System_Drawing_Point  
 $DestinationEsxi.Name = "DestinationEsxi"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 21  
 $System_Drawing_Size.Width = 358  
 $DestinationEsxi.Size = $System_Drawing_Size  
 $DestinationEsxi.TabIndex = 6  
   
 $vCenterForm.Controls.Add($DestinationEsxi)  
   
 $SourceEsxi.DataBindings.DefaultDataSourceUpdateMode = 0  
 $SourceEsxi.FormattingEnabled = $True  
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 235  
 $System_Drawing_Point.Y = 158  
 $SourceEsxi.Location = $System_Drawing_Point  
 $SourceEsxi.Name = "SourceEsxi"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 21  
 $System_Drawing_Size.Width = 358  
 $SourceEsxi.Size = $System_Drawing_Size  
 $SourceEsxi.TabIndex = 5  
   
 $vCenterForm.Controls.Add($SourceEsxi)  
   
 $MigrateVM.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 452  
 $System_Drawing_Point.Y = 126  
 $MigrateVM.Location = $System_Drawing_Point  
 $MigrateVM.Name = "MigrateVM"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 23  
 $System_Drawing_Size.Width = 140  
 $MigrateVM.Size = $System_Drawing_Size  
 $MigrateVM.TabIndex = 18  
 $MigrateVM.Text = "Migrate-VMs"  
 $MigrateVM.UseVisualStyleBackColor = $True  
 $MigrateVM.add_Click($MigrateVM_OnClick)  
 $MigrateVM.Enabled = $false  
   
 $vCenterForm.Controls.Add($MigrateVM)  
   
 $ClusterList01.DataBindings.DefaultDataSourceUpdateMode = 0  
 $ClusterList01.FormattingEnabled = $True  
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 13  
 $System_Drawing_Point.Y = 42  
 $ClusterList01.Location = $System_Drawing_Point  
 $ClusterList01.Name = "ClusterList01"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 79  
 $System_Drawing_Size.Width = 423  
 $ClusterList01.Size = $System_Drawing_Size  
 $ClusterList01.TabIndex = 3  
 $ClusterList01.CheckOnClick = $True  
   
 $vCenterForm.Controls.Add($ClusterList01)  
   
 $listlabel.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 452  
 $System_Drawing_Point.Y = 42  
 $listlabel.Location = $System_Drawing_Point  
 $listlabel.Name = "listlabel"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 41  
 $System_Drawing_Size.Width = 141  
 $listlabel.Size = $System_Drawing_Size  
 $listlabel.TabIndex = 17  
 $listlabel.Text = "Clusters List"  
 $listlabel.Font = 'Microsoft Sans Serif,14'  
   
 $vCenterForm.Controls.Add($listlabel)  
   
 $vCenterServer.DataBindings.DefaultDataSourceUpdateMode = 0  
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 165  
 $System_Drawing_Point.Y = 12  
 $vCenterServer.Location = $System_Drawing_Point  
 $vCenterServer.Name = "vCenterServer"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 20  
 $System_Drawing_Size.Width = 428  
 $vCenterServer.Size = $System_Drawing_Size  
 $vCenterServer.TabIndex = 2  
   
 $vCenterForm.Controls.Add($vCenterServer)  
   
 $statusBar1.DataBindings.DefaultDataSourceUpdateMode = 0  
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 0  
 $System_Drawing_Point.Y = 518  
 $statusBar1.Location = $System_Drawing_Point  
 $statusBar1.Name = "statusBar1"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 22  
 $System_Drawing_Size.Width = 659  
 $statusBar1.Size = $System_Drawing_Size  
 $statusBar1.TabIndex = 1  
   
 $vCenterForm.Controls.Add($statusBar1)  
   
   
 $LoginvCenter.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 13  
 $System_Drawing_Point.Y = 11  
 $LoginvCenter.Location = $System_Drawing_Point  
 $LoginvCenter.Name = "LoginvCenter"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 23  
 $System_Drawing_Size.Width = 146  
 $LoginvCenter.Size = $System_Drawing_Size  
 $LoginvCenter.TabIndex = 0  
 $LoginvCenter.Text = "Login-vCenter"  
 $LoginvCenter.UseVisualStyleBackColor = $True  
 $LoginvCenter.add_Click($LoginvCenter_OnClick)  
   
 $vCenterForm.Controls.Add($LoginvCenter)  
   
   
 $ESXiInfo.DataBindings.DefaultDataSourceUpdateMode = 0  
   
 $System_Drawing_Point = New-Object System.Drawing.Point  
 $System_Drawing_Point.X = 13  
 $System_Drawing_Point.Y = 127  
 $ESXiInfo.Location = $System_Drawing_Point  
 $ESXiInfo.Name = "ESXiInfo"  
 $System_Drawing_Size = New-Object System.Drawing.Size  
 $System_Drawing_Size.Height = 23  
 $System_Drawing_Size.Width = 146  
 $ESXiInfo.Size = $System_Drawing_Size  
 $ESXiInfo.TabIndex = 16  
 $ESXiInfo.Text = "Get-EsxiInfo"  
 $ESXiInfo.UseVisualStyleBackColor = $True  
 $ESXiInfo.add_Click($ESXiInfo_OnClick)  
 $ESXiInfo.Enabled = $false  
   
 $vCenterForm.Controls.Add($ESXiInfo)  
   
 #endregion Generated Form Code  
   
 #Save the initial state of the form  
 $InitialFormWindowState = $vCenterForm.WindowState  
 #Init the OnLoad event to correct the initial state of the form  
 $vCenterForm.add_Load($OnLoadForm_StateCorrection)  
   
 #region code here  
 function Show-FormOnTop {  
   $vCenterForm.TopMost = $true  
   $vCenterForm.TopMost = $false  
 }  
 Show-FormOnTop  
   
 function Show-MessageBox {   
   param (   
     [string]$Message = "Show user friendly Text Message",   
     [string]$Title = 'Title here',   
     [ValidateRange(0,5)]   
     [Int]$Button = 0,   
     [ValidateSet('None','Hand','Error','Stop','Question','Exclamation','Warning','Asterisk','Information')]   
     [string]$Icon = 'Error'   
   )   
   #Note: $Button is equl to [System.Enum]::GetNames([System.Windows.Forms.MessageBoxButtons])   
   #Note: $Icon is equl to [System.Enum]::GetNames([System.Windows.Forms.MessageBoxIcon])   
   $MessageIcon = [System.Windows.Forms.MessageBoxIcon]::$Icon   
   [System.Windows.Forms.MessageBox]::Show($Message,$Title,$Button,$MessageIcon)   
 }  
   
 Function Confirm-Powercli {  
   $AllModules = Get-Module -ListAvailable VMware.VimAutomation.Core  
   if (!$AllModules) {  
     Show-MessageBox -Message "Install VMware Powercli 6.0 or Latest. `n`nUse either 'Install-Module VMware.VimAutomation.Core' `nor download Powercli from 'http://my.vmware.com'" -Title 'VMware Powercli Missing error' | Out-Null  
   }  
   else {  
     Import-Module VMware.VimAutomation.Core  
     $PowercliVer = Get-Module VMware.VimAutomation.Core  
     $ReqVersion = New-Object System.Version('6.0.0.0')  
     if ($PowercliVer.Version -gt $ReqVersion) {  
       'Ok'  
     }  
     else {  
       Show-MessageBox -Message "Install VMware Powercli 6.0 or Latest. `n`nUse either 'Install-Module VMware.VimAutomation.Core' `nor download Powercli from 'http://my.vmware.com'" -Title 'Lower version Powercli' | Out-Null  
     }  
   }  
 }  
   
 function Disconnect-vCenter {  
     
   try {  
     Disconnect-VIServer * -Confirm:$false -ErrorAction Stop  
     $ClusterList01.Items.Clear()  
   }  
   catch {  
     #Show-MessageBox -Message $error[0].Exception.Message -Title 'Error Connecting vCenter' | Out-Null  
   }  
 }  
   
 Function Connect-vCenter {  
   param (  
     [parameter(Mandatory=$true)]  
     [string]$vCenterName  
   )  
   Confirm-Powercli  
   Show-FormOnTop  
   if ($Global:DefaultVIServer -ne $null) {  
     Disconnect-vCenter  
   }  
   if (($vCenterServer.Text -eq $vCenterNameWaterMark) -or ($vCenterServer.Text -eq '')) {   
     #[System.Windows.Forms.MessageBox]::Show("Please type valid Domain\Account", "Textbox empty")  
     Show-MessageBox -Message "Please type valid vCenter server name" -Title 'vCenter Server Name' | Out-Null  
   }   
   else {   
     try {  
       $cred = Get-Credential  
       Connect-VIServer $vCenterName -Credential $Cred -ErrorAction Stop #| Out-Null  
       $Script:ClusterName = Get-Cluster  
       if ($Script:ClusterName -ne $null) {  
         $ClusterList01.Items.AddRange($Script:ClusterName.Name)  
       }  
       else {  
         Show-MessageBox -Message 'No cluster found in current vCenter' -Title 'Error: No cluster to select' | Out-Null  
       }  
     }  
     catch {  
       Show-FormOnTop  
       Show-MessageBox -Message $error[0].Exception.Message -Title 'Error Connecting vCenter' | Out-Null  
     }  
   }  
   Show-FormOnTop  
   $statusBar1.Text = 'Connected to vCenter successfully'  
 }  
   
 $vCenterNameWaterMark = 'Type vCenter server or IP'  
 $vCenterServer.Text = $vCenterNameWaterMark  
 $vCenterServer.ForeColor = 'DarkGray'  
 $vCenterServer.add_TextChanged({$vCenterServer.ForeColor = 'Black'})  
   
 $LoginvCenter.add_click({  
   Connect-vCenter -vCenterName $vCenterServer.Text.Trim()  
   Show-FormOnTop  
 })  
   
 $ClusterList01.add_ItemCheck({  
   $ESXiInfo.Enabled = $True  
 })  
   
 function Add-ComboBoxItem {  
   $Clusters = $script:ClusterName | Where-Object {$_.Name -in $ClusterList01.CheckedItems}  
   $Script:EsxiHosts = $Clusters | Get-VMHost | Where-Object {$_.ConnectionState -eq 'Connected' -and $_.PowerState -eq 'PoweredOn'}  
   if ($Script:EsxiHosts -eq $null) {  
     Show-MessageBox -Message "No esxi host found in selected cluster" -Title 'Select Cluster'  
     $MigrateVM.Enabled = $false  
   }  
   else {  
     $SourceEsxi.Items.AddRange($EsxiHosts.Name)  
     $SourceEsxi.Text = $SourceEsxi.Items[0]  
     $DestinationEsxi.Items.AddRange($EsxiHosts.Name)  
     $DestinationEsxi.Text = $SourceEsxi.Items[1]  
     $MigrateVM.Enabled = $True  
     Update-VMDataGrid  
   }  
 }  
   
 function Update-VMDataGrid {  
   $SourceEsxiInfo = $Script:EsxiHosts | Where-Object {$_.Name -eq $SourceEsxi.Text}  
   $Script:VMlist = $SourceEsxiInfo | Get-VM  
   if ($Script:VMlist -eq $null) {  
     Show-MessageBox -Message "No VMs found in selected source esxi" -Title 'Select an'  
   }  
   else {  
     $ArrayList = New-Object System.Collections.ArrayList  
     $VMs = $Script:VMlist | Select-Object Name, NumCpu, MemoryGB, PowerState  
     if ($VMs -ne $null) {  
       $ArrayList.AddRange($VMs)  
       $dataGrid1.DataSource = $ArrayList  
       $dataGrid1.ReadOnly = $True  
       $RemCount.text = $VMs.Count  
     }  
     else {  
       $statusBar1.Text = "Selected source esxi host doesn't have any VMs"  
     }  
   }  
 }  
   
 $ESXiInfo.Add_click({  
   $SourceEsxi.Items.Clear()  
   $DestinationEsxi.Items.Clear()  
   if ($ClusterList01.CheckedItems.Count -eq 0) {  
     Show-MessageBox -Message 'Choose atleast one Cluster from list' -Title 'Select cluster' | Out-Null  
   }  
   Add-ComboBoxItem  
 })  
   
 function Change-DestCombobox {  
   Show-MessageBox -Message 'Source and destination esxi servers are same' -Title 'Esxi name conflict' | Out-Null  
   $dataGrid1.DataSource = $null  
   $DestinationEsxi.Text = $SourceEsxi.Items[$SourceEsxi.SelectedIndex - 1]  
   $statusBar1.Text = 'Source and destination Esxi should different'  
 }  
   
 $SourceEsxi.Add_TextChanged({  
   if ($DestinationEsxi.Text -eq $SourceEsxi.Text) {  
     Change-DestCombobox  
   }  
   Update-VMDataGrid  
 })  
   
 $DestinationEsxi.Add_TextChanged({  
   if ($DestinationEsxi.Text -eq $SourceEsxi.Text) {  
     Change-DestCombobox  
   }  
 })  
   
 $MigrateVM.Add_Click({  
   $ConfirmMigrate = Show-MessageBox -Message 'Do you want to start migrating VMs' -Title 'Start VM migration' -Button 4 -Icon Question  
   $DestEsxi = Get-VMHost $DestinationEsxi.Text  
   $VMCount = $Script:VMlist.Count  
   if ($ConfirmMigrate -eq 'Yes') {  
     foreach ($VM in $Script:VMlist)     {  
       $CurrentVM.Text = "Currently migrating VM: $($VM.Name)"  
       $vCenterForm.Refresh()  
       try {  
         $VM | Move-VM -Destination $DestEsxi -ErrorAction Stop  
         $VMCount--  
         $LastVM.Text = "Last VM migrated: $($VM.Name)"  
       }  
       catch {  
         $statusBar1.Text = 'Few VMs cannot be migrated, check manually'  
       }  
       $RemCount.Text = $VMCount  
       $vCenterForm.Refresh()  
       Show-FormOnTop  
     }       
     $CurrentVM.Text = 'All VMs Migrated'  
   }  
 })  
   
 $logoffvcenter.Add_Click({  
   Disconnect-vCenter  
   $ESXiInfo.Enabled = $false  
   $dataGrid1.DataSource.Clear()  
   $MigrateVM.Enabled = $false  
   $SourceEsxi.Items.Clear()  
   $DestinationEsxi.Items.Clear()  
   $statusBar1.Text = 'Disconnected vCenter successfully'  
 })  
   
 #endregion Code here  
 Show-FormOnTop  
 #Show the Form  
 $vCenterForm.ShowDialog()| Out-Null  

Useful articles
POWERCLI: VMWARE ESXI CONFIGURE (VSWITCH) VMKERNEL NETWORK PORT FOR ISCSI STORAGE
POWERCLI VMWARE: CONFIGURE SOFTWARE ISCSI STORAGE ADAPTER AND ADD VMFS DATASTORE
POWERCLI: VIRTUAL MACHINE STORAGE MIGRATE/SVMOTION AND DATASTORE PORT BINDING MULTIPATHING

After completing updating my most of the ESXi 6.5 hosts in the environment as shown in ESXi 6.5 upgrade bundle via command line: No Space Left On Device Error, I wanted few standalone ESXi server to update to 6.0 version, for same offline bundle can be downloaded from my.vmware.com. I uploaded copy the update zip file on one of the connected datastore to ESXi Upload files to vmware ESXi datastore: Different methods. While running below update command I ran into error.

vSphere products distinguish between upgrades, which make major changes to the software, and updates, which make smaller changes to the software.

esxcli software vib update -d /vmfs/volumes/Share-Disk01/Esxi600-201611001.zip

[DependencyError]
VIB VMware_bootbank_esx_base_6.0.0-2.52.4600944 requires vsan << 6.0.0-2.53, but the requirement cannot be satisfied within the ImageProfile.
VIB VMware_bootbank_esx_base_6.0.0-2.52.4600944 requires vsan >= 6.0.0-2.52, but the requirement cannot be satisfied within the ImageProfile.

To resolve this issue, this offline bundle should be updated using profile update. First I need to verify what profiles are exists in ESXi offline bundle using esxcli command line.
esxcli software sources profile list -d /vmfs/volumes/Share-Disk01/Esxi600-201611001.zip

This shows me 4 profiles and I will be using first name for update. Next command start update.
esxcli software profile update -d /vmfs/volumes/Share-Disk01/Esxi600-201611001.zip -p ESXi-6.0.0-20161104001-standard

Update Result
     Message: The update completed successfully, but the system needs to be rebooted for the changes to be effective.
     Reboot Required: true

Once server is rebooted I can see vmware version using vmware -v or in the vsphere web client.

Useful Articles
VMWARE VSPHERE UPDATE MANAGER (VUM) - IMPORTING ESXI ISO AND CREATE UPGRADE BASELINE
VMWARE VSPHERE UPDATE MANAGER (VUM) - UPGRADE ESXI OS
VMWARE VCENTER 6.5 UPGRADATION ERROR
THERE WAS ERROR CONNECTING VMWARE VSPHERE UPDATE MANAGER [VCENTER:443] DATABASE TEMPORARILY UNAVAILABLE OR HAS NETWORK PROBLEMS

I received few standalone ESXi 6.5 hosts for patching for branch office, I wanted to upgrade build number on server, As there was no option of VMWare update manager for standalone esxi. Here I upgraded them using offline bundle zip. These requires offline bundle zip to be be downloaded from url https://my.vmware.com/group/vmware/patch#search directly. It asks for valid login username and password, once logged in successfully, From the right hand side click Products, select Product Patches from drop down list. here you can filter and select the required patch bundles. and start download.

Once file is downloaded, upload,copy it to datastore using information shown on Upload files to vmware ESXi datastore: Different methods. 

Once file is uploaded to datastore, first command shows the existing version and build number, next is common command to update and patch Esxi OS build.
vmware -v
esxcli software vib update -d /vmfs/volumes/Share-Disk01/ESXi650-201803001.zip

While updating I received below error.
 [InstallationError]
 [Errno 28] No space left on device
       vibs = VMware_bootbank_esx-base_6.5.0-1.41.7967591
 Please refer to the log file for more details.

I checked and verified space using command stat -f / and didn't find any issue related space, there was enough Blocks and Inodes available, infact, only few Inodes where in use. df -h was showing enough available space.

System swap is a memory reclamation process that can take advantage of unused memory resources across an entire system. To resolved this directly login to Esxi server UI website, and under Manage > System > Select Swap and click to Edit settings. On the the Edit swap configuration, select the Datastore from drop-down menu.

This setting can also be enabled from logging into vCenter directly, Select ESXi server, go to Configure tab then select System Swap, Here Edit System swap settings, and use datastore specified by host for swap files. Under Can use datastore select the datastore and click Ok.

After running the same command again I see installation result is successful as below screenshot, Reboot is required once upgrade is successful.

[VCLOUD-LAB\vkunal@esxi002:~] esxcli software vib update -d /vmfs/volumes/Share-Disk01/ESXi650-201803001.zip
Installation Result
   Message: The update completed successfully, but the system needs to be rebooted for the changes to be effective.
   Reboot Required: true
   VIBs Installed: VMW_bootbank_i40en_1.3.1-5vmw.650.1.26.5969303, VMW_bootbank_igbn_0.1.0.0-15vmw.650.1.36.7388607, VMW_bootbank_ixgben_1.4.1-2vmw.650.1.26.5969303, VMW_bootbank_misc-drivers_6.5.0-1.36.7388607, VMW_bootbank_ne1000_0.8.0-16vmw.650.1.26.5969303, VMW_bootbank_ntg3_4.1.3.0-1vmw.650.1.36.7388607, VMW_bootbank_nvme_1.2.0.32-5vmw.650.1.36.7388607, VMW_bootbank_nvmxnet3_2.0.0.23-1vmw.650.1.36.7388607, VMW_bootbank_pvscsi_0.1-1vmw.650.1.26.5969303, VMW_bootbank_qlnativefc_2.1.50.0-1vmw.650.1.26.5969303, VMW_bootbank_sata-ahci_3.0-26vmw.650.1.26.5969303, VMW_bootbank_usbcore-usb_1.0-3vmw.650.1.26.5969303, VMW_bootbank_vmkata_0.1-1vmw.650.1.36.7388607, VMW_bootbank_vmkusb_0.1-1vmw.650.1.36.7388607, VMW_bootbank_vmw-ahci_1.0.0-39vmw.650.1.26.5969303, VMware_bootbank_cpu-microcode_6.5.0-1.41.7967591, VMware_bootbank_esx-base_6.5.0-1.41.7967591, VMware_bootbank_esx-dvfilter-generic-fastpath_6.5.0-1.36.7388607, VMware_bootbank_esx-tboot_6.5.0-1.41.7967591, VMware_bootbank_esx-ui_1.23.0-6506686, VMware_bootbank_esx-xserver_6.5.0-0.23.5969300, VMware_bootbank_lsu-hp-hpsa-plugin_2.0.0-5vmw.650.1.26.5969303, VMware_bootbank_lsu-lsi-lsi-mr3-plugin_1.0.0-10vmw.650.1.26.5969303, VMware_bootbank_lsu-lsi-lsi-msgpt3-plugin_1.0.0-7vmw.650.1.26.5969303, VMware_bootbank_lsu-lsi-megaraid-sas-plugin_1.0.0-8vmw.650.1.26.5969303, VMware_bootbank_lsu-lsi-mpt2sas-plugin_2.0.0-6vmw.650.1.26.5969303, VMware_bootbank_vmware-esx-esxcli-nvme-plugin_1.2.0.10-1.26.5969303, VMware_bootbank_vsan_6.5.0-1.41.7547709, VMware_bootbank_vsanhealth_6.5.0-1.41.7547710, VMware_locker_tools-light_6.5.0-1.33.7273056
   VIBs Removed: VMW_bootbank_i40en_1.1.0-1vmw.650.0.0.4564106, VMW_bootbank_igbn_0.1.0.0-12vmw.650.0.0.4564106, VMW_bootbank_ixgben_1.0.0.0-9vmw.650.0.14.5146846, VMW_bootbank_misc-drivers_6.5.0-0.14.5146846, VMW_bootbank_ne1000_0.8.0-11vmw.650.0.14.5146846, VMW_bootbank_ntg3_4.1.0.0-1vmw.650.0.0.4564106, VMW_bootbank_nvme_1.2.0.32-2vmw.650.0.0.4564106, VMW_bootbank_nvmxnet3_2.0.0.22-1vmw.650.0.0.4564106, VMW_bootbank_pvscsi_0.1-1vmw.650.0.0.4564106, VMW_bootbank_qlnativefc_2.1.30.0-11vmw.650.0.0.4564106, VMW_bootbank_sata-ahci_3.0-22vmw.650.0.0.4564106, VMW_bootbank_usbcore-usb_1.0-3vmw.650.0.0.4564106, VMW_bootbank_vmkata_0.1-1vmw.650.0.0.4564106, VMW_bootbank_vmkusb_0.1-1vmw.650.0.14.5146846, VMW_bootbank_vmw-ahci_1.0.0-34vmw.650.0.14.5146846, VMware_bootbank_cpu-microcode_6.5.0-0.0.4564106, VMware_bootbank_esx-base_6.5.0-0.19.5310538, VMware_bootbank_esx-dvfilter-generic-fastpath_6.5.0-0.0.4564106, VMware_bootbank_esx-tboot_6.5.0-0.0.4564106, VMware_bootbank_esx-ui_1.18.0-5270848, VMware_bootbank_esx-xserver_6.5.0-0.0.4564106, VMware_bootbank_lsu-hp-hpsa-plugin_2.0.0-3vmw.650.0.0.4564106, VMware_bootbank_lsu-lsi-lsi-mr3-plugin_1.0.0-7vmw.650.0.0.4564106, VMware_bootbank_lsu-lsi-lsi-msgpt3-plugin_1.0.0-6vmw.650.0.0.4564106, VMware_bootbank_lsu-lsi-megaraid-sas-plugin_1.0.0-7vmw.650.0.0.4564106, VMware_bootbank_lsu-lsi-mpt2sas-plugin_2.0.0-5vmw.650.0.0.4564106, VMware_bootbank_vmware-esx-esxcli-nvme-plugin_1.2.0.10-0.0.4564106, VMware_bootbank_vsan_6.5.0-0.19.5310540, VMware_bootbank_vsanhealth_6.5.0-0.19.5310541, VMware_locker_tools-light_6.5.0-0.0.4564106
   VIBs Skipped: VMW_bootbank_ata-libata-92_3.00.9.2-16vmw.650.0.0.4564106, VMW_bootbank_ata-pata-amd_0.3.10-3vmw.650.0.0.4564106, VMW_bootbank_ata-pata-atiixp_0.4.6-4vmw.650.0.0.4564106, VMW_bootbank_ata-pata-cmd64x_0.2.5-3vmw.650.0.0.4564106, VMW_bootbank_ata-pata-hpt3x2n_0.3.4-3vmw.650.0.0.4564106, VMW_bootbank_ata-pata-pdc2027x_1.0-3vmw.650.0.0.4564106, VMW_bootbank_ata-pata-serverworks_0.4.3-3vmw.650.0.0.4564106, VMW_bootbank_ata-pata-sil680_0.4.8-3vmw.650.0.0.4564106, VMW_bootbank_ata-pata-via_0.3.3-2vmw.650.0.0.4564106, VMW_bootbank_block-cciss_3.6.14-10vmw.650.0.0.4564106, VMW_bootbank_char-random_1.0-3vmw.650.0.0.4564106, VMW_bootbank_ehci-ehci-hcd_1.0-4vmw.650.0.14.5146846, VMW_bootbank_elxnet_11.1.91.0-1vmw.650.0.0.4564106, VMW_bootbank_hid-hid_1.0-3vmw.650.0.0.4564106, VMW_bootbank_ima-qla4xxx_2.02.18-1vmw.650.0.0.4564106, VMW_bootbank_ipmi-ipmi-devintf_39.1-4vmw.650.0.0.4564106, VMW_bootbank_ipmi-ipmi-msghandler_39.1-4vmw.650.0.0.4564106, VMW_bootbank_ipmi-ipmi-si-drv_39.1-4vmw.650.0.0.4564106, VMW_bootbank_lpfc_11.1.0.6-1vmw.650.0.0.4564106, VMW_bootbank_lsi-mr3_6.910.18.00-1vmw.650.0.0.4564106, VMW_bootbank_lsi-msgpt2_20.00.01.00-3vmw.650.0.0.4564106, VMW_bootbank_lsi-msgpt3_12.00.02.00-11vmw.650.0.0.4564106, VMW_bootbank_misc-cnic-register_1.78.75.v60.7-1vmw.650.0.0.4564106, VMW_bootbank_mtip32xx-native_3.9.5-1vmw.650.0.0.4564106, VMW_bootbank_nenic_1.0.0.2-1vmw.650.0.0.4564106, VMW_bootbank_net-bnx2_2.2.4f.v60.10-2vmw.650.0.0.4564106, VMW_bootbank_net-bnx2x_1.78.80.v60.12-1vmw.650.0.0.4564106, VMW_bootbank_net-cdc-ether_1.0-3vmw.650.0.0.4564106, VMW_bootbank_net-cnic_1.78.76.v60.13-2vmw.650.0.0.4564106, VMW_bootbank_net-e1000_8.0.3.1-5vmw.650.0.0.4564106, VMW_bootbank_net-e1000e_3.2.2.1-2vmw.650.0.0.4564106, VMW_bootbank_net-enic_2.1.2.38-2vmw.650.0.0.4564106, VMW_bootbank_net-fcoe_1.0.29.9.3-7vmw.650.0.0.4564106, VMW_bootbank_net-forcedeth_0.61-2vmw.650.0.0.4564106, VMW_bootbank_net-igb_5.0.5.1.1-5vmw.650.0.0.4564106, VMW_bootbank_net-ixgbe_3.7.13.7.14iov-20vmw.650.0.0.4564106, VMW_bootbank_net-libfcoe-92_1.0.24.9.4-8vmw.650.0.0.4564106, VMW_bootbank_net-mlx4-core_1.9.7.0-1vmw.650.0.0.4564106, VMW_bootbank_net-mlx4-en_1.9.7.0-1vmw.650.0.0.4564106, VMW_bootbank_net-nx-nic_5.0.621-5vmw.650.0.0.4564106, VMW_bootbank_net-tg3_3.131d.v60.4-2vmw.650.0.0.4564106, VMW_bootbank_net-usbnet_1.0-3vmw.650.0.0.4564106,VMW_bootbank_net-vmxnet3_1.1.3.0-3vmw.650.0.0.4564106, VMW_bootbank_nhpsa_2.0.6-3vmw.650.0.0.4564106, VMW_bootbank_nmlx4-core_3.16.0.0-1vmw.650.0.0.4564106, VMW_bootbank_nmlx4-en_3.16.0.0-1vmw.650.0.0.4564106, VMW_bootbank_nmlx4-rdma_3.16.0.0-1vmw.650.0.0.4564106, VMW_bootbank_nmlx5-core_4.16.0.0-1vmw.650.0.0.4564106, VMW_bootbank_ohci-usb-ohci_1.0-3vmw.650.0.0.4564106, VMW_bootbank_qedentv_2.0.3.29-1vmw.650.0.0.4564106, VMW_bootbank_qfle3_1.0.2.7-1vmw.650.0.0.4564106, VMW_bootbank_qflge_1.1.0.3-1vmw.650.0.0.4564106, VMW_bootbank_sata-ata-piix_2.12-10vmw.650.0.0.4564106, VMW_bootbank_sata-sata-nv_3.5-4vmw.650.0.0.4564106, VMW_bootbank_sata-sata-promise_2.12-3vmw.650.0.0.4564106, VMW_bootbank_sata-sata-sil24_1.1-1vmw.650.0.0.4564106, VMW_bootbank_sata-sata-sil_2.3-4vmw.650.0.0.4564106, VMW_bootbank_sata-sata-svw_2.3-3vmw.650.0.0.4564106, VMW_bootbank_scsi-aacraid_1.1.5.1-9vmw.650.0.0.4564106, VMW_bootbank_scsi-adp94xx_1.0.8.12-6vmw.650.0.0.4564106, VMW_bootbank_scsi-aic79xx_3.1-5vmw.650.0.0.4564106, VMW_bootbank_scsi-bnx2fc_1.78.78.v60.8-1vmw.650.0.0.4564106, VMW_bootbank_scsi-bnx2i_2.78.76.v60.8-1vmw.650.0.0.4564106, VMW_bootbank_scsi-fnic_1.5.0.45-3vmw.650.0.0.4564106, VMW_bootbank_scsi-hpsa_6.0.0.84-1vmw.650.0.0.4564106, VMW_bootbank_scsi-ips_7.12.05-4vmw.650.0.0.4564106, VMW_bootbank_scsi-iscsi-linux-92_1.0.0.2-3vmw.650.0.0.4564106, VMW_bootbank_scsi-libfc-92_1.0.40.9.3-5vmw.650.0.0.4564106, VMW_bootbank_scsi-megaraid-mbox_2.20.5.1-6vmw.650.0.0.4564106, VMW_bootbank_scsi-megaraid-sas_6.603.55.00-2vmw.650.0.0.4564106, VMW_bootbank_scsi-megaraid2_2.00.4-9vmw.650.0.0.4564106, VMW_bootbank_scsi-mpt2sas_19.00.00.00-1vmw.650.0.0.4564106, VMW_bootbank_scsi-mptsas_4.23.01.00-10vmw.650.0.0.4564106, VMW_bootbank_scsi-mptspi_4.23.01.00-10vmw.650.0.0.4564106, VMW_bootbank_scsi-qla4xxx_5.01.03.2-7vmw.650.0.0.4564106, VMW_bootbank_shim-iscsi-linux-9-2-1-0_6.5.0-0.0.4564106, VMW_bootbank_shim-iscsi-linux-9-2-2-0_6.5.0-0.0.4564106, VMW_bootbank_shim-libata-9-2-1-0_6.5.0-0.0.4564106, VMW_bootbank_shim-libata-9-2-2-0_6.5.0-0.0.4564106, VMW_bootbank_shim-libfc-9-2-1-0_6.5.0-0.0.4564106, VMW_bootbank_shim-libfc-9-2-2-0_6.5.0-0.0.4564106, VMW_bootbank_shim-libfcoe-9-2-1-0_6.5.0-0.0.4564106, VMW_bootbank_shim-libfcoe-9-2-2-0_6.5.0-0.0.4564106, VMW_bootbank_shim-vmklinux-9-2-1-0_6.5.0-0.0.4564106, VMW_bootbank_shim-vmklinux-9-2-2-0_6.5.0-0.0.4564106, VMW_bootbank_shim-vmklinux-9-2-3-0_6.5.0-0.0.4564106, VMW_bootbank_uhci-usb-uhci_1.0-3vmw.650.0.0.4564106, VMW_bootbank_usb-storage-usb-storage_1.0-3vmw.650.0.0.4564106, VMW_bootbank_vmkplexer-vmkplexer_6.5.0-0.0.4564106, VMW_bootbank_xhci-xhci_1.0-3vmw.650.0.0.4564106, VMware_bootbank_emulex-esx-elxnetcli_11.1.28.0-0.0.4564106, VMware_bootbank_native-misc-drivers_6.5.0-0.0.4564106, VMware_bootbank_rste_2.0.2.0088-4vmw.650.0.0.4564106

After reboot, login to SSH and verify build number with vmware -v command.

I can also verify the build number using on Esxi ui web client or vCenter server on summary page.

Useful Articles
VMWARE VSPHERE UPDATE MANAGER (VUM) - IMPORTING ESXI ISO AND CREATE UPGRADE BASELINE
VMWARE VSPHERE UPDATE MANAGER (VUM) - UPGRADE ESXI OS
VMWARE VCENTER 6.5 UPGRADATION ERROR
THERE WAS ERROR CONNECTING VMWARE VSPHERE UPDATE MANAGER [VCENTER:443] DATABASE TEMPORARILY UNAVAILABLE OR HAS NETWORK PROBLEMS

Reset forgotten ESXi root password on Domain joined Esxi using vSphere web client and Powercli
Reset ESXi root password using Host Profiles on vCenter server: VMWare vSphere Web client

This is third part of the above related articles reset forgotten root password on esxi and there is a disclaimer Use this procedure on your own risk because method mentioned here is unsupported by VMware and unofficial. Before making any changes to Esxi make sure you have taken complete Esxi server configuration backup. Also to reset esxi root password using offline ISO, you will require reboot so make sure you plan and put Esxi server into maintenance mode, this will ensure no VMs are running on subjected Esxi host and it is good for activities. This document I created for my colleague who are windows administrator and bit hesitant on using Linux command to make changes, 80% changes are made using Linux user interface.

For this demo, I have downloaded hiren boot cd from url location http://www.hirensbootcd.org/download/. I mostly use either Dell or HP server, and use DRAC and ILO respectively for remote console. Once ISO is mounted on ILO or DRAC of server, Reboot esxi and go to BIOS and change BOOT option to CD-ROM, Exit with saving changes, One more time server is rebooted and ISO boot is loaded.

Once server is booted from bootable Hiren's BootCD, Select 3rd option from the  list >> Linux based rescue environment (Parted Magic), and hit enter to start live CD OS.

Next hit enter on Start (Options: Language us). This will start loading OS from CD.

Once OS is loaded, There is Partition Editor software icon on the desktop, double click it, this loads Gparted utility. Here in the partition lists Esxi configuration is stored on physical hard disk partition /dev/sda5 and /dev/sda6. As Esxi maintains configuration backup, For Esxi 6.5 sda5 partition contains backup of esxi configuration files/folders, and Sda6 has current configuration files and folders.

I am going to mount both the drive one by one first I am going to show it for Sda5 then same configuration need to be done on sda6 as well. First right click on /dev/sda5 and click Mount, then select the mount location to /dev/sda5.

Once Esxi partition is mounted successfully, open File Manager icon on desktop twice and on first file manger navigate to sda5 250M/media/sda5 and on other file manager go to folder location /tmp. Locate file name state.tgz from folder path /media/sda5, copy it and paste it under /tmp folder.

Once file is copied, under /tmp, either double click state.tgz or right click it go to context menu Open>> Extract. This untar/unzip data under state folder.

There is a untarred local.tgz file under folder /tmp/state now. Double click local.tgz or in the context menu right click, Open then extract it, to the local folder, inside local folder there is etc folder.

Go to the path /tmp/state/local/etc. Find shadow file inside, right click and open it with Text Editor as shown.

Passwords are registered under shadow file, Remove the hash info, this is encoded password (This almost impossible to break or decrypt dcode this password). Removing this code means root password is made empty or blank. Save this file.

Next open RoxTerm from taskbar, this is similar to putty or Terminal command tool. Type command cd /tmp/state/local. This location has the esxi configuration  files and modified shadow folder with blanked root password inside etc folder. Tar the etc folder using tar -czf local.tgz etc and next run next command tar -czf state.tgz local.tgz, to make ready state.tgz.

As you can see when I list the directory. I see local.tgz and state.tgz already present, because I tested it before hand, running tar command again update both tgz file. No need to rerun tar command again and again, this is just for demo purpose.

Here I am copying processed state.tgz file from /tmp/state/local to /media/sda5 ESXi server, this will show message of overwrite, as file already exist. Go ahead with the same and replace it.

Next on GParted partition editor,  right click sda5 device (it shows a lock means it is mounted) and click unmount.

Next Do the same for /dev/sda6 partition, mount it, copy state.tgz, untar, and under local/etc folder local shadow file and make necessary changes to root user by removing hashed encoded password string. You can also perform this trick completely using command line on RoxTerm  as below.

# This mounts the sda6 partition
mount /dev/sda6  /mnt

# Change directory location to /mnt
cd /mnt

# Copy file state.tgz to /tmp folder
cp state.tgz /tmp

# Change directory location to /tmp 
cd /tmp

# Untar state.tgz file
tar -xzf state.tgz

# Untar local.tgz file
tar -xzf local.tgz

# Change directory location to etc
cd etc

# Edit shadow file using vi editor, Press i to start editing, once password hash is removed, press esc button and save it with :wq.
vi shadow

# Tar (update) etc folder into local.tgz 
tar -czf local.tgz etc

# Tar (update) local.tgz folder into state.tgz
tar -czf state.tgz local.tgz

# Copy new state.tgz to /mnt/ on esxi server
cp state.tgz /mnt/

# Unmount partition /mnt and reboot.
unmount /mnt
reboot

Before rebooting esxi server make sure you unmount Hiren's ISO file from remote console and change BIOS to boot from hard disk. Once server is restarted and Esxi OS is loaded. After pressing F2, I am able to login with empty blank root password.

Once logged onto Esxi successfully change the password under Configure Password. As you can see Old Password is in grayed out in color means there is no password set, it is empty. Change it with new password.

Useful articles
PART 1 : INSTALLING ESXI ON VMWARE WORKSTATION HOME LAB
Reset/Restart HP ILO (Integrated Lights-outs) using putty
Reset HP ILO password from Esxi server
PART 3 : MY VSPHERE LAB CONFIGURATION ON VMWARE WORKSTATION