Rename and Join Domain script - problem when name exist in AD

This is a script I am using after imaging a thin client laptop.
What it does is join the domain, then rename the laptop while joined to the domain according to our naming convention, resulting in the Domain-Joining and Computer-Naming step needing only 1 reboot.

The problem is, if the computer name already exist in AD, it will only rename the computer and it will not join the domain.

I've pieced together this script with the help of others (judicious imitation), however, I feel the part where I need it to join the domain even if the computer already exists requires more advanced knowledge of WMI/win32 with respect to PowerShell and AD.


#Name computer based on naming convention and SMBIOSAssetTag, then Join the Domain, Then Reboot

$comp=gwmi win32_computersystem -Authentication 6
#Prompts you to enter in domain credentials to add
$cred=get-credential
#WMI Query to set new computer name
gwmi Win32_SystemEnclosure | % { $newname = "CITY-" + $_.SMBIOSAssetTag }
$domain="domain.com"
#Join The Domain
$comp.JoinDomainOrWorkGroup($domain,$cred.getnetworkcredential().password,$cred.username,$null,3)
#Rename domain-joined Computer
$comp.rename($newname,$cred.getnetworkcredential().password,$cred.username)
Restart-Computer

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This is the part I believe needs to be adjusted:
$comp.JoinDomainOrWorkGroup($domain,$cred.getnetworkcredential().password,$cred.username,$null,3)

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The $null part is the OU, I believe, and the 3 part is a code.
The reference for that is here: http://msdn.microsoft.com/en-us/library/aa392154(v=vs.85).aspx
I believe "3" is the sum of "1" and "2":
1 being "Default. Joins a computer to a domain. If this value is not specified, the join is a computer to a workgroup."
2 being "Creates an account on a domain."

What I don't see here are any flags/bits that would let me delete the computer in AD before joining, or joining the system using the same name.

I tried 32 and 35 instead of 3 but that doesn't work.
garryshapeAsked:
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BT15Commented:
http://msdn.microsoft.com/en-us/library/aa392154(v=vs.85).aspx

you might try using4 instead:

$comp.JoinDomainOrWorkGroup($domain,$cred.getnetworkcredential().password,$cred.username,$null,4) 

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unless you have already tried this, you might want to rename the computer prior to joining the domain.
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garryshapeAuthor Commented:
Ok I will try. I wasn't certain on the wording of that.
So 4 means it deletes the object from AD before creating the object right?
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BT15Commented:
not really sure. the wording confused me also.

I'll admit, using this method for joining machines to the domain is a little foreign to me.

if you had either the RSAT tools from Microsoft or the Quest AD tools installed on your image, I would suggest using the commandlets there to check for the existence of the name before attempting to join:

an example in RSAT:

if (get-computer $computername -credential $cred) {
   write-host $computername exists. removing
   remove-adcomputer $computername -credential $cred -confirm:$false
 }


#now use your code to rename and join
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Netman66Commented:
Why not use just 1?  if the account exists, it will use it then rename.  If the account doesn't exist it joins with existing name then renames it.

I see no logic to using 3.
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garryshapeAuthor Commented:
Sorry , I will try it with just 1 next time tomorrow and report back.
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garryshapeAuthor Commented:
1 doesn't appear to work.
It stays in the work group.

I have to delete the computer from Active Directory first then the script will work
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garryshapeAuthor Commented:
Thanks for the input, the issue appears to be with our AD servers and an admin is looking into. Scripts solutions work.
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