functions/Copy-DbaLinkedServer.ps1
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function Copy-DbaLinkedServer { <# .SYNOPSIS Copy-DbaLinkedServer migrates Linked Servers from one SQL Server to another. Linked Server logins and passwords are migrated as well. .DESCRIPTION By using password decryption techniques provided by Antti Rantasaari (NetSPI, 2014), this script migrates SQL Server Linked Servers from one server to another, while maintaining username and password. Credit: https://blog.netspi.com/decrypting-mssql-database-link-server-passwords/ .PARAMETER Source Source SQL Server (2005 and above). You must have sysadmin access to both SQL Server and Windows. .PARAMETER SourceSqlCredential Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential). Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported. For MFA support, please use Connect-DbaInstance. .PARAMETER Destination Destination SQL Server (2005 and above). You must have sysadmin access to both SQL Server and Windows. .PARAMETER DestinationSqlCredential Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential). Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported. For MFA support, please use Connect-DbaInstance. .PARAMETER LinkedServer The linked server(s) to process - this list is auto-populated from the server. If unspecified, all linked servers will be processed. .PARAMETER ExcludeLinkedServer The linked server(s) to exclude - this list is auto-populated from the server .PARAMETER UpgradeSqlClient Upgrade any SqlClient Linked Server to the current Version .PARAMETER WhatIf Shows what would happen if the command were to run. No actions are actually performed. .PARAMETER Confirm Prompts you for confirmation before executing any changing operations within the command. .PARAMETER Force By default, if a Linked Server exists on the source and destination, the Linked Server is not copied over. Specifying -force will drop and recreate the Linked Server on the Destination server. .PARAMETER EnableException By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message. This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting. Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch. .NOTES Tags: WSMan, Migration, LinkedServer Author: Chrissy LeMaire (@cl), netnerds.net Website: https://dbatools.io Copyright: (c) 2018 by dbatools, licensed under MIT License: MIT https://opensource.org/licenses/MIT Requires: sysadmin access on SQL Servers Limitations: This just copies the SQL portion. It does not copy files (i.e. a local SQLite database, or Microsoft Access DB), nor does it configure ODBC entries. .LINK https://dbatools.io/Copy-DbaLinkedServer .EXAMPLE PS C:\> Copy-DbaLinkedServer -Source sqlserver2014a -Destination sqlcluster Copies all SQL Server Linked Servers on sqlserver2014a to sqlcluster. If Linked Server exists on destination, it will be skipped. .EXAMPLE PS C:\> Copy-DbaLinkedServer -Source sqlserver2014a -Destination sqlcluster -LinkedServer SQL2K5,SQL2k -Force Copies over two SQL Server Linked Servers (SQL2K and SQL2K2) from sqlserver to sqlcluster. If the credential already exists on the destination, it will be dropped. #> [CmdletBinding(DefaultParameterSetName = "Default", SupportsShouldProcess, ConfirmImpact = "Medium")] [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseSingularNouns", "", Justification = "Internal functions are ignored")] param ( [parameter(Mandatory)] [DbaInstanceParameter]$Source, [PSCredential]$SourceSqlCredential, [parameter(Mandatory)] [DbaInstanceParameter[]]$Destination, [PSCredential]$DestinationSqlCredential, [object[]]$LinkedServer, [object[]]$ExcludeLinkedServer, [switch]$UpgradeSqlClient, [switch]$Force, [switch]$EnableException ) begin { if (-not $script:isWindows) { Stop-Function -Message "Copy-DbaCredential is only supported on Windows" return } $null = Test-ElevationRequirement -ComputerName $Source.ComputerName if ($Force) { $ConfirmPreference = 'none' } function Copy-DbaLinkedServers { param ( [string[]]$LinkedServer, [bool]$force ) Write-Message -Level Verbose -Message "Collecting Linked Server logins and passwords on $($sourceServer.Name)." $sourcelogins = Get-DecryptedObject -SqlInstance $sourceServer -Type LinkedServer $serverlist = $sourceServer.LinkedServers if ($LinkedServer) { $serverlist = $serverlist | Where-Object Name -In $LinkedServer } if ($ExcludeLinkedServer) { $serverList = $serverlist | Where-Object Name -NotIn $ExcludeLinkedServer } foreach ($currentLinkedServer in $serverlist) { $provider = $currentLinkedServer.ProviderName try { $destServer.LinkedServers.Refresh() $destServer.LinkedServers.LinkedServerLogins.Refresh() } catch { #here to avoid an empty catch $null = 1 } $linkedServerName = $currentLinkedServer.Name $linkedServerProductName = $currentLinkedServer.ProductName $linkedServerDataSource = $currentLinkedServer.DataSource $copyLinkedServer = [pscustomobject]@{ SourceServer = $sourceServer.Name DestinationServer = $destServer.Name Name = $linkedServerName ProductName = $linkedServerProductName DataSource = $linkedServerDataSource Type = "Linked Server" Status = $null Notes = $provider DateTime = [DbaDateTime](Get-Date) } # This does a check to warn of missing OleDbProviderSettings but should only be checked on SQL on Windows if ($destServer.Settings.OleDbProviderSettings.Name.Length -ne 0) { if (!$destServer.Settings.OleDbProviderSettings.Name -contains $provider -and !$provider.StartsWith("SQLN")) { $copyLinkedServer.Status = "Skipped" $copyLinkedServer.Notes = "Missing provider" $copyLinkedServer | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject Write-Message -Level Verbose -Message "$($destServer.Name) does not support the $provider provider. Skipping $linkedServerName." continue } } if ($null -ne $destServer.LinkedServers[$linkedServerName]) { if (!$force) { if ($Pscmdlet.ShouldProcess($destinstance, "$linkedServerName exists $($destServer.Name). Skipping.")) { $copyLinkedServer.Status = "Skipped" $copyLinkedServer.Notes = "Already exists on destination" $copyLinkedServer | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject Write-Message -Level Verbose -Message "$linkedServerName exists $($destServer.Name). Skipping." } continue } else { if ($Pscmdlet.ShouldProcess($destinstance, "Dropping $linkedServerName")) { if ($currentLinkedServer.Name -eq 'repl_distributor') { Write-Message -Level Verbose -Message "repl_distributor cannot be dropped. Not going to try." continue } $destServer.LinkedServers[$linkedServerName].Drop($true) $destServer.LinkedServers.refresh() } } } Write-Message -Level Verbose -Message "Attempting to migrate: $linkedServerName." If ($Pscmdlet.ShouldProcess($destinstance, "Migrating $linkedServerName")) { try { $sql = $currentLinkedServer.Script() | Out-String Write-Message -Level Debug -Message $sql if ($UpgradeSqlClient -and $sql -match "sqlncli") { $destProviders = $destServer.Settings.OleDbProviderSettings | Where-Object { $_.Name -like 'SQLNCLI*' } $newProvider = $destProviders | Sort-Object Name -Descending | Select-Object -First 1 -ExpandProperty Name Write-Message -Level Verbose -Message "Changing sqlncli to $newProvider" $sql = $sql -replace ("sqlncli[0-9]+", $newProvider) } $destServer.Query($sql) if ($copyLinkedServer.ProductName -eq 'SQL Server' -and $copyLinkedServer.Name -ne $copyLinkedServer.DataSource) { $sql2 = "EXEC sp_setnetname '$($copyLinkedServer.Name)', '$($copyLinkedServer.DataSource)'; " $destServer.Query($sql2) } $destServer.LinkedServers.Refresh() Write-Message -Level Verbose -Message "$linkedServerName successfully copied." $copyLinkedServer.Status = "Successful" $copyLinkedServer | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject } catch { $copyLinkedServer.Status = "Failed" $copyLinkedServer | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject Stop-Function -Message "Issue adding linked server $destServer." -Target $linkedServerName -InnerErrorRecord $_ $skiplogins = $true } } if ($skiplogins -ne $true) { $destlogins = $destServer.LinkedServers[$linkedServerName].LinkedServerLogins $lslogins = $sourcelogins | Where-Object { $_.Name -eq $linkedServerName } foreach ($login in $lslogins) { if ($Pscmdlet.ShouldProcess($destinstance, "Migrating $($login.Login)")) { $currentlogin = $destlogins | Where-Object { $_.RemoteUser -eq $login.Identity } $copyLinkedServer.Type = $login.Identity if ($currentlogin.RemoteUser.length -ne 0) { try { $currentlogin.SetRemotePassword($login.Password) $currentlogin.Alter() $copyLinkedServer.Status = "Successful" $copyLinkedServer | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject } catch { $copyLinkedServer.Status = "Failed" $copyLinkedServer | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject Stop-Function -Message "Failed to copy login." -Target $login -InnerErrorRecord $_ } } } } } } } if ($null -ne $SourceSqlCredential.Username) { Write-Message -Level Verbose -Message "You are using a SQL Credential. Note that this script requires Windows Administrator access on the source server. Attempting with $($SourceSqlCredential.Username)." } try { $sourceServer = Connect-SqlInstance -SqlInstance $Source -SqlCredential $SourceSqlCredential return } catch { Stop-Function -Message "Error occurred while establishing connection to $instance" -Category ConnectionError -ErrorRecord $_ -Target $Source return } if (!(Test-SqlSa -SqlInstance $sourceServer -SqlCredential $SourceSqlCredential)) { Stop-Function -Message "Not a sysadmin on $source. Quitting." -Target $sourceServer return } Write-Message -Level Verbose -Message "Getting NetBios name for $source." $sourceNetBios = Resolve-NetBiosName $sourceserver Write-Message -Level Verbose -Message "Checking if Remote Registry is enabled on $source." try { Invoke-Command2 -Raw -Credential $Credential -ComputerName $sourceNetBios -ScriptBlock { Get-ItemProperty -Path "HKLM:\SOFTWARE\" } -ErrorAction Stop } catch { Stop-Function -Message "Can't connect to registry on $source." -Target $sourceNetBios -ErrorRecord $_ return } } process { if (Test-FunctionInterrupt) { return } foreach ($destinstance in $Destination) { try { $destServer = Connect-SqlInstance -SqlInstance $destinstance -SqlCredential $DestinationSqlCredential } catch { Stop-Function -Message "Error occurred while establishing connection to $instance" -Category ConnectionError -ErrorRecord $_ -Target $destinstance -Continue } if (!(Test-SqlSa -SqlInstance $destServer -SqlCredential $DestinationSqlCredential)) { Stop-Function -Message "Not a sysadmin on $destinstance" -Target $destServer -Continue } # Magic happens here Copy-DbaLinkedServers $LinkedServer -Force:$force } } } |