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Test-ADDSDomainControllerUninstallation

Brian Lich|Last Updated: 3/26/2017

SYNOPSIS

Runs the prerequisites for uninstalling a domain controller in Active Directory.

SYNTAX

ADDSDomainControllerUninstall (Default)

Test-ADDSDomainControllerUninstallation [-LocalAdministratorPassword <SecureString>]
 [-Credential <PSCredential>] [-DemoteOperationMasterRole] [-DnsDelegationRemovalCredential <PSCredential>]
 [-IgnoreLastDCInDomainMismatch] [-IgnoreLastDnsServerForZone] [-LastDomainControllerInDomain]
 [-NoRebootOnCompletion] [-RemoveApplicationPartitions] [-RemoveDnsDelegation] [-RetainDCMetadata] [-Force]
 [<CommonParameters>]

ADDSDomainControllerUninstallForceRemoval

Test-ADDSDomainControllerUninstallation [-LocalAdministratorPassword <SecureString>]
 [-Credential <PSCredential>] [-DemoteOperationMasterRole] [-ForceRemoval] [-NoRebootOnCompletion] [-Force]
 [<CommonParameters>]

DESCRIPTION

The Test-ADDSDomainControllerUninstallation cmdlet runs those prerequisite checks which would be performed if you were to use the Uninstall-ADDSDomainController cmdlet to uninstall a domain controller in Active Directory. It differs from using the WhatIf parameter with the Uninstall-ADDSDomainController cmdlet in that instead of summarizing the changes that would occur during the uninstallation process, this cmdlet actually tests whether those changes are possible given the current environment.

For more information on the scope of these prerequisite checks that the ADDSDeployment module performs when using this cmdlet see the section ADPrep and Prerequisite Checking Architecture in AD DS Simplified Administration.

EXAMPLES

Example 1: Test if uninstalling a domain controller is possible

PS C:\> Test-ADDSDomainControllerUninstallation

This command runs the prerequisites to determine if the uninstall of an additional domain controller in a domain is possible. The command also prompts the user to set and confirm the local Administrator password prior to completing the uninstallation process.

PARAMETERS

-Credential

Specifies the user name and password that corresponds to the account used to install the domain controller. To prompt the user to supply a password, use Runs the prerequisites (only) to determine if installing a domain controller is possible that includes a DNS server for the corp.contoso.com domain, using domain administrator credentials, and then prompts the user to correctly specify the Directory Services Restore Mode (DSRM) password. Use the Get-Credential cmdlet in place of an existing PSCredential type. This parameter will cause Windows PowerShell to prompt the user to enter credentials using the Windows security login UI.

Type: PSCredential
Parameter Sets: (All)
Aliases: 

Required: False
Position: Named
Default value: NULL
Accept pipeline input: False
Accept wildcard characters: False

-DemoteOperationMasterRole

Indicates that forced demotion should continue even if an operations master role is discovered on domain controller from which AD DS is being removed.

Type: SwitchParameter
Parameter Sets: (All)
Aliases: 

Required: False
Position: Named
Default value: NULL
Accept pipeline input: False
Accept wildcard characters: False

-DnsDelegationRemovalCredential

Specifies the account credentials to use when you create or remove the DNS delegation. If you do not specify a value, the account credentials that you specify for the AD DS installation or removal are used to remove the DNS delegation. As an alternative, you can specify the asterisk (*) to prompt the user to enter credentials.

Type: PSCredential
Parameter Sets: ADDSDomainControllerUninstall
Aliases: 

Required: False
Position: Named
Default value: NULL
Accept pipeline input: False
Accept wildcard characters: False

-Force

Forces the command to run without asking for user confirmation.

Type: SwitchParameter
Parameter Sets: (All)
Aliases: 

Required: False
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False

-ForceRemoval

Indicates that the cmdlet forces the removal of a domain controller. Use this parameter to force the uninstall of AD DS if you need to remove the domain controller and do not have connectivity to other domain controllers within the domain topology.

Type: SwitchParameter
Parameter Sets: ADDSDomainControllerUninstallForceRemoval
Aliases: 

Required: True
Position: Named
Default value: NULL
Accept pipeline input: False
Accept wildcard characters: False

-IgnoreLastDCInDomainMismatch

Indicates that Windows PowerShell ignores any inconsistency that it detects with the value that you specify for the LastDomainControllerInDomain parameter. For instance, if you specify LastDomainControllerInDomain but Windows PowerShell detects that there is actually another active domain controller in the domain, you can specify the IgnoreLastDCInDomainMismatch parameter to have Windows PowerShell continue the removal of AD DS from the domain controller despite the inconsistency that it has detected. Similarly, if you do not specify LastDomainControllerInDomain but Windows PowerShell is unable to detect that another domain controller is in the domain, you can specify IgnoreLastDCInDomainMismatch to have Windows PowerShell continue to remove AD DS from the domain controller.

Type: SwitchParameter
Parameter Sets: ADDSDomainControllerUninstall
Aliases: 

Required: False
Position: Named
Default value: NULL
Accept pipeline input: False
Accept wildcard characters: False

-IgnoreLastDnsServerForZone

Indicates that the cmdlet continues the removal of AD DS despite the fact that the domain controller is the last DNS server for one or more of the Active Directory-integrated DNS zones that it hosts.

Type: SwitchParameter
Parameter Sets: ADDSDomainControllerUninstall
Aliases: 

Required: False
Position: Named
Default value: NULL
Accept pipeline input: False
Accept wildcard characters: False

-LastDomainControllerInDomain

Indicates that the cmdlet removes AD DS from the last controller in the domain.

Type: SwitchParameter
Parameter Sets: ADDSDomainControllerUninstall
Aliases: 

Required: False
Position: Named
Default value: NULL
Accept pipeline input: False
Accept wildcard characters: False

-LocalAdministratorPassword

Specifies a local administrator account password when AD DS is removed from a domain controller. In earlier releases, where uninstall of AD DS was done using Dcpromo.exe for demotion, the default was to allow an empty password for this setting. In Windows PowerShell, the ADDS Deployment module requires that a non-empty password string value be assigned. If a value is not provided for this parameter, you are prompted to enter a value for the password at the Windows PowerShell prompt. The password value must be a secure string.

If this parameter is not specified, the cmdlet prompts you to enter and confirm a masked password. This is the preferred usage when running the cmdlet interactively. If additionally there are no other arguments specified with the cmdlet, you are prompted to enter a masked password for this parameter but no confirmation of the password entered is made. This is not recommended as it could allow a mistyped password to be configured. Another available advanced option is to use the ConvertTo-SecureString cmdlet and specify the password string inline as unmasked console input, which is also not a recommended security best practice in production deployments.

Type: SecureString
Parameter Sets: (All)
Aliases: 

Required: False
Position: Named
Default value: NULL
Accept pipeline input: False
Accept wildcard characters: False

-NoRebootOnCompletion

Indicates that the cmdlet does not restart the computer upon completion, regardless of success. By default, reboot upon completion occurs when this cmdlet is used and this parameter is omitted.

Type: SwitchParameter
Parameter Sets: (All)
Aliases: 

Required: False
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False

-RemoveApplicationPartitions

Indicates that the cmdlet removes application partitions during the removal of AD DS from a domain controller.

Type: SwitchParameter
Parameter Sets: ADDSDomainControllerUninstall
Aliases: 

Required: False
Position: Named
Default value: NULL
Accept pipeline input: False
Accept wildcard characters: False

-RemoveDnsDelegation

Indicates that the cmdlet preserves DNS delegations that point to this DNS server from the parent DNS zone.

By default, this parameter is set to false, which means DNS delegations that point to this server from the parent DNS zone will not be retained after uninstallation of the domain controller. This setting corresponds to the earlier Dcpromo.exe parameter default of /RemoveDNSDelegation:Yes.

Type: SwitchParameter
Parameter Sets: ADDSDomainControllerUninstall
Aliases: 

Required: False
Position: Named
Default value: NULL
Accept pipeline input: False
Accept wildcard characters: False

-RetainDCMetadata

Indicates that the domain controller should retain metadata for the domain after removal of AD DS.

Type: SwitchParameter
Parameter Sets: ADDSDomainControllerUninstall
Aliases: 

Required: False
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False

CommonParameters

This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see about_CommonParameters.

INPUTS

OUTPUTS

NOTES

AD DS Simplified Administration

Uninstall-ADDSDomainController

Get-Credential

ConvertTo-SecureString

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