Speedup host readiness for VMware Cloud Foundation (VCF)

#10/24/2020
#Speed up of VCF host readiness
#OCT/31/2020 -> Added DNS Server configuration
#NOV/12/2020 -> Fixed a bug when no hostnames were entered
  
#Added to ignore the invalid certificate warning
Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -Confirm:$false
  
#Clear the view
cls
  
Write-Host -ForeGround 'Yellow' -back 'black' 'To use this script you will need to:'
Write-Host -ForeGround 'Yellow' -back 'black' '- Have configured ESXi management networks'
Write-Host -ForeGround 'Yellow' -back 'black' '- Have root password'
Write-Host -ForeGround 'Yellow' -back 'black' '- Provide all the IP Addresses, VLAN ID, and NTP Addreses'
  
$warning = 'Enter Y to continue. ---> '
Do {
  Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
  $continue = Read-Host
  $warning = 'Mmmm... Some info missing? When ready enter a Y to continue! ---> '
} While ($continue -notmatch 'Y')
  
#Regex patterns for validations
$ipRegexPattern = '^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$'
$vlanRegexPattern = '[0-4095]'
$fqdnRegexPattern = '(?=^.{1,254}$)(^(?:(?!\d+\.|-)[a-zA-Z0-9_\-]{1,63}(?<!-)\.?)+(?:[a-zA-Z]{2,})$)'
$hostcountRegexPattern = '[1-100]'
  
#Variables
$esxiIPs = @()
$hostnames = @()
  
#Constants
$esxUser = 'root'
  
$warning = 'Enter the root password, it wil be hidden so relax of watchers! ---> '
Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
  
#Request root password for host configuration
$esxPswd = Read-Host -AsSecureString
$credentials = New-Object System.Management.Automation.PSCredential ('root', $esxPswd)
  
for ($i= 0 ;$i -lt 4;$i++){
  
    switch ( $i )
    {
        0 { $warning = 'Enter the IP address of the FIRST ESXi! ---> '}
        1 { $warning = 'Enter the IP address of the SECOND ESXi! ---> '}
        2 { $warning = 'Enter the IP address of the THIRD ESXi! ---> '}
        3 { $warning = 'Enter the IP address of the FORTH ESXi! ---> '}
    }
      
    Do {
      Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
      $esxi = Read-Host
      $warning = 'You did not enter a valid IP address. Please try again! ---> '
    } While ($esxi -notmatch $ipRegexPattern)
    $esxiIPs += $esxi
}
  
#Configure hostnames?
$warning = 'Do you want to configure esxi Hostnames? If already configured on DCUI, skip this step. Enter Y to confirm. ---> '
Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
$configureHostnames = Read-Host
  
if ($configureHostnames -eq 'Y'){
    for ($i= 0 ;$i -lt 4;$i++){
  
        switch ( $i )
        {
            0 { $warning = 'Enter the Hostname (FQDN) of the FIRST ESXi! ---> '}
            1 { $warning = 'Enter the Hostname (FQDN) of the SECOND ESXi! ---> '}
            2 { $warning = 'Enter the Hostname (FQDN) of the THIRD ESXi! ---> '}
            3 { $warning = 'Enter the Hostname (FQDN) of the FORTH ESXi! ---> '}
        }
          
        Do {
          Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
          $hostname = Read-Host
          $warning = 'You did not enter a valid FQDN. Please try again! ---> '
        } While ($hostname -notmatch $fqdnRegexPattern)
        $hostnames += $hostname
    }
}
else{
    Write-Host -ForeGround 'Yellow' -back 'black' 'Ok, no hostname configuration' 
}
  
$warning = 'Enter the VLAN ID for the VM Network (it must match the Management Network VLAN)! ---> '
Do {
  Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
  $VLANID = Read-Host
  $warning = 'You did not enter a valid VLAN ID. Please try again! ---> '
} While ($VLANID -notmatch $vlanRegexPatter)
  
$warning = 'Enter the NTP Address! ---> '
Do {
  Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
  $NTP1 = Read-Host
  $warning = 'You did not enter a valid NTP IP Address. Please try again! ---> '
} While ($NTP1 -notmatch $ipRegexPattern)
  
  
#Need another NTP Server?
$warning = 'Add a second NTP? Enter Y to confirm ---> '
Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
$anotherNTP = Read-Host
  
if ($anotherNTP -eq 'Y'){
    $warning = 'Enter the Secondary NTP Address! ---> '
    Do {
      Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
      $NTP2 = Read-Host
      $warning = 'You did not enter a valid NTP IP Address. Please try again! ---> '
    } While ($NTP2 -notmatch $ipRegexPattern) 
}
 
 
#DNS Configurations
$warning = 'Enter primary DNS Server! ---> '
Do {
  Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
  $dnspri = Read-Host
  $warning = 'You did not enter a valid DNS IP Address. Please try again! ---> '
} While ($dnspri -notmatch $ipRegexPattern)
  
  
#Need another DNS Server?
$warning = 'Add a second DNS Server? Enter Y to confirm ---> '
Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
$anotherDNS = Read-Host
  
if ($anotherDNS -eq 'Y'){
    $warning = 'Enter the Secondary DNS IP Address! ---> '
    Do {
      Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
      $dnsalt = Read-Host
      $warning = 'You did not enter a valid DNS IP Address. Please try again! ---> '
    } While ($dnsalt -notmatch $ipRegexPattern) 
}
 
#DNS Configurations
$warning = 'Enter search domain name! ---> '
Do {
  Write-Host -ForeGround 'Yellow' -back 'black' -noNewLine $warning
  $searchdomainname = Read-Host
  $warning = 'You did not enter a valid DNS IP Address. Please try again! ---> '
} While ($searchdomainname -notmatch $fqdnRegexPattern)
 
#Loop with all the ip address provided
$counter = 0
foreach ($esxi in $esxiIPs) {
  
    $errorFlag = $false
  
    Write-host 'Connecting to ' $esxi
      
    try {
        Connect-VIServer -Server $esxi -Credential $credentials -ErrorAction Stop | Out-Null
        Write-Host -ForeGround 'black' -back 'green' 'Connected to host =======> ' $esxi
        $esxcli = Get-EsxCli -VMHost $esxi
         
        if ($hostnames.length -gt 0){
            $esxcli.system.hostname.set($null,$hostnames[$counter],$null) | Out-Null
        }
          
        #Search for vSwitch0 object
        $vswitch = Get-VirtualSwitch -VMHost $esxi -Name vSwitch0
          
        if ($vswitch.nic.length -gt 1){
            Write-Host -ForeGround 'white' -back 'red' 'Host ' $esxi ' has more than 1 nic on vSwitch0, please check the host before proceeding with Bring Up Process.'
            $errorFlag = $true
        }
        else{
            Write-Host -ForeGround 'black' -back 'green' 'Host ' $esxi ' has only 1 nic on vSwitch 0. Well done!'
        }
  
        try{
              
            $VMNetworkPG = Get-VirtualPortgroup -Name 'VM Network'
            Set-VirtualPortGroup -VirtualPortGroup $VMNetworkPG -VLanID $VLANID -ErrorAction Stop | Out-Null
            Write-Host -ForeGround 'black' -back 'green' 'Configured VM Network of host ' $esxi ' with VLAN ID ' $VLANID
        }
        catch
        {
            Write-Host 'The portgroup might not be created, lets try to fix it.'
            #Create the PG and set the VLAN ID
            $VMNetworkPG = New-VirtualPortGroup -VirtualSwitch $vswitch  -Name 'VM Network' | Out-Null
            Set-VirtualPortGroup -VirtualPortGroup $VMNetworkPG -VLanID $VLANID -ErrorAction Stop | Out-Null
            Write-Host -ForeGround 'black' -back 'green' 'Configured VM Network of host ' $esxi ' with VLAN ID ' $VLANID
        }
  
        try{    
            #NTP Adjustment
            Add-VMHostNtpServer -VMHost $esxi -NtpServer $NTP1 -ErrorAction Stop | Out-Null
            Write-Host -ForeGround 'black' -back 'green' 'Configured NTP Server 1 of host ' $esxi ' with NTP ' $NTP1
        }
        catch
        {
            Write-Host -ForeGround 'black' -back 'Yellow' 'I was not able to configure NTP ' $NTP1 ' on ' $esxi ' maybe its already added.'
              
        }
          
        if ($NTP2 -ne '') {
            try{    
                #NTP Adjustment
                Add-VMHostNtpServer -VMHost $esxi -NtpServer $NTP2 -ErrorAction Stop | Out-Null
                Write-Host -ForeGround 'black' -back 'green' 'Configured NTP Server 2 of host ' $esxi ' with NTP ' $NTP2
            }
            catch
            {
                Write-Host -ForeGround 'black' -back 'Yellow' 'I was not able to configure NTP ' $NTP2 ' on ' $esxi ' maybe its already added.'
            }
        }
         
        if ($dnsalt -ne '') {
            try{    
                #DNS Servers Adjustment
                Get-VMHostNetwork -VMHost $esxi | Set-VMHostNetwork -DNSAddress $dnspri, $dnsalt -SearchDomain $searchdomainname -Confirm:$false | Out-Null
                Write-Host -ForeGround 'black' -back 'green' 'Configured DNS Servers of host ' $esxi ' with DNS Server ' $dnspri ' and ' $dnsalt
            }
            catch
            {
                Write-Host -ForeGround 'black' -back 'Yellow' 'I was not able to configure DNS ' $dnspri ' and ' $dnsalt ' on ' $esxi ' maybe its already added.'
                  
            }
 
        }
        else
        {
            try{    
                #DNS Servers Adjustment
                Get-VMHostNetwork -VMHost $esxi | Set-VMHostNetwork -DNSAddress $dnspri -SearchDomain $searchdomainname -Confirm:$false | Out-Null
                Write-Host -ForeGround 'black' -back 'green' 'Configured DNS Server 1 of host ' $esxi ' with DNS Server ' $dnspri
            }
            catch
            {
                Write-Host -ForeGround 'black' -back 'Yellow' 'I was not able to configure DNS ' $dnspri ' on ' $esxi ' maybe its already added.'
                  
            }
        }
  
        #Adjust the ESXi time with local computer time
        $t = Get-Date
        $dst = Get-VMHost -Name $esxi | %{ Get-View $_.ExtensionData.ConfigManager.DateTimeSystem }
        $dst.UpdateDateTime((Get-Date($t.ToUniversalTime()) -format u)) | Out-Null
        Write-Host -ForeGround 'black' -back 'green' 'Synchornized time of host ' $esxi ' with computer time '
  
        #Open NTP ports
        Get-VMHostFirewallException -VMHost $esxi | where {$_.Name -eq 'NTP client'} | Set-VMHostFirewallException -Enabled:$true | Out-Null
        Write-Host -ForeGround 'black' -back 'green' 'Added firewall exception for NTP Client on host ' $esxi
  
        #Start NTP Service and set it to autostart
        Get-VmHostService -VMHost $esxi | Where-Object {$_.key -eq 'ntpd'} | Start-VMHostService -Confirm:$false | Out-Null
        Get-VmHostService -VMHost $esxi | Where-Object {$_.key -eq 'ntpd'} | Set-VMHostService -policy 'on' | Out-Null
        Write-Host -ForeGround 'black' -back 'green' 'NTP started and configured to Start and Stop with host on host ' $esxi
  
        #Start SSH Service and set it to autostart
        Get-VmHostService -VMHost $esxi | Where-Object {$_.key -eq 'TSM-SSH'} | Start-VMHostService -Confirm:$false | Out-Null
        Get-VmHostService -VMHost $esxi | Where-Object {$_.key -eq 'TSM-SSH'} | Set-VMHostService -policy 'on' | Out-Null
        Write-Host -ForeGround 'black' -back 'green' 'TSM-SSH started and configured to Start and Stop with host on host ' $esxi
          
        $counter += 1
  
        Disconnect-VIServer -Server $esxi -Confirm:$false
        Write-Host -ForeGround 'black' -back 'green' '<======= Disonnected from host ' $esxi
          
        if ($errorFlag){
            Write-Host -ForeGround 'white' -back 'red' 'Check the configuration of ' $esxi ' before proceeding with bring up process.'
        }
        else{
            Write-Host -ForeGround 'black' -back 'green' 'Host ' $esxi ' is ready for VCF! Woho!'
        }
    }
    catch{
        Write-Host -ForeGround 'white' -back 'red' 'I was not able to connect ' $esxi ' please check the connection to it.'
    }
}