ExchangeNodeMaintenanceMode

1.0.0.2

ExchangeNodeMaintenanceMode.psm1

                                #requires -Version 3.0 -Modules DnsClient, FailoverClusters

<#    

    ===========================================================================

     Description:    Exchange Cluster Node Maintenance Mode Utilities

     Author:        Joerg Hochwald <joerg.hochwald@outlook.com>

     CompanyName:    Enabling Technology - http://www.enatec.io

     Filename:         ExchangeNodeMaintenanceMode.psm1

     License:        BSD License - BSD 3-clause "New" or "Revised" License

     Link:            http://jhochwald.com

    ---------------------------------------------------------------------------

     Module Name: ExchangeNodeMaintenanceMode

    ===========================================================================

#>

function Invoke-Exchange2016Workaround

{

    <#

            .SYNOPSIS

            Workaround for Exchange 2016 on Windows Server 2016

            .DESCRIPTION

            Workaround for Exchange 2016 on Windows Server 2016

            .EXAMPLE

            PS C:\> Invoke-Exchange2016Workaround

            .NOTES

            This is a quick an dirty one :)

            . LINK

            Set-ExchangeNodeMaintenanceModeOn

            Set-ExchangeNodeMaintenanceModeOff

            Test-ExchangeNodeMaintenanceMode

    #>

    $paramGetCommand = @{

        Name          = 'Get-MailboxDatabaseCopyStatus'

        ErrorAction   = 'SilentlyContinue'

        WarningAction = 'SilentlyContinue'

    }

    if (-not (Get-Command @paramGetCommand )) 

    {

        try 

        {

            $paramAddPSSnapin = @{

                Name = 'Microsoft.Exchange.Management.PowerShell.SnapIn'

            }

            Add-PSSnapin @paramAddPSSnapin

        }

        catch 

        {

            $paramWriteError = @{

                Message       = 'Sure that this is a Exchange Server?'

                ErrorAction   = 'Stop'

                WarningAction = 'SilentlyContinue'

            }

            Write-Error @paramWriteError 

        }

    }

}

function Set-ExchangeNodeMaintenanceModeOn

{

    <#

            .SYNOPSIS

            Set the Exchange Node to Service

            .DESCRIPTION

            Set the Exchange Node to Service

            .PARAMETER ComputerName

            Name of the Exchange Node, default is local system

            .EXAMPLE

            # Node is in Maintenance Mode

            PS C:\> Set-ExchangeNodeMaintenanceModeOn

            $false

            .EXAMPLE

            # Node is not in Maintenance Mode

            PS C:\> Set-ExchangeNodeMaintenanceModeOn

            $true

            .NOTES

            TODO: Find a detection for the Workaround

            TODO: Find a better solution for the certificate check issue

            . LINK

            Invoke-Exchange2016Workaround

            Set-ExchangeNodeMaintenanceModeOff

            Test-ExchangeNodeMaintenanceMode

    #>

    param

    (

        [Parameter(ValueFromPipeline = $true,

                ValueFromPipelineByPropertyName = $true,

        Position = 1)]

        [ValidateNotNullOrEmpty()]

        [string]

        $ComputerName = $env:COMPUTERNAME

    )

    Begin

    {

        # Workaround for Exchange 2016 on Windows Server 2016

        Invoke-Exchange2016Workaround

    }

    Process

    {

        # Draining the server

        $paramSetServerComponentState = @{

            identity  = $ComputerName

            Component = 'ServerWideOffline'

            State     = 'Draining'

            Requester = 'Maintenance'

        }

        Set-ServerComponentState @paramSetServerComponentState

        # Restart of the Sertvices enforces the draining

        $paramRestartService = @{

            Name          = 'MSExchangeTransport'

            Force         = $true

            ErrorAction   = 'SilentlyContinue'

            WarningAction = 'SilentlyContinue'

            Confirm       = $false

        }

        $null = (Restart-Service @paramRestartService)

        $paramRestartService = @{

            Name          = 'MSExchangeFrontEndTransport'

            Force         = $true

            ErrorAction   = 'SilentlyContinue'

            WarningAction = 'SilentlyContinue'

            Confirm       = $false

        }

        $null = (Restart-Service @paramRestartService)

        # Suspend the cluster node

        $paramSuspendClusterNode = @{

            Name    = $ComputerName

            Confirm = $false

        }

        $null = (Suspend-ClusterNode @paramSuspendClusterNode)

        # Move all databases to the other servers

        $paramSetMailboxServer = @{

            identity                                 = $ComputerName

            DatabaseCopyActivationDisabledAndMoveNow = $true

        }

        $null = (Set-MailboxServer @paramSetMailboxServer)

        # Get the Cluster Twin

        $PartnerNode = (Get-ClusterNode | Where-Object -FilterScript {

                $_.Name -ne $ComputerName

        } | Select-Object -ExpandProperty name)

        $paramResolveDnsName = @{

            Name = $PartnerNode

            Type = 'A'

        }

        $PartnerNodeFQDN = ((Resolve-DnsName @paramResolveDnsName).name)

        $paramSetServerComponentState = @{

            identity  = $ComputerName

            Component = 'ServerWideOffline'

            State     = 'Inactive'

            Requester = 'Maintenance'

        }

        $null = (Set-ServerComponentState @paramSetServerComponentState)

        $paramRedirectMessage = @{

            Server  = $ComputerName

            Target  = $PartnerNodeFQDN

            Confirm = $false

        }

        $null = (Redirect-Message @paramRedirectMessage)

    }

}

function Set-ExchangeNodeMaintenanceModeOff

{

    <#

            .SYNOPSIS

            Return Exchange Node to normal operation

            .DESCRIPTION

            Return Exchange Node to normal operation

            .PARAMETER ComputerName

            Name of the Exchange Node, default is local system

            .EXAMPLE

            # Enable normal operations

            PS C:\> Set-ExchangeNodeMaintenanceModeOff

            $true

            .EXAMPLE

            # Fails to enable noprmal operations

            PS C:\> Set-ExchangeNodeMaintenanceModeOff

            $false

            .NOTES

            . LINK

            Invoke-Exchange2016Workaround

            Set-ExchangeNodeMaintenanceModeOn

            Test-ExchangeNodeMaintenanceMode

    #>

    [OutputType([bool])]

    param

    (

        [Parameter(ValueFromPipeline = $true,

                ValueFromPipelineByPropertyName = $true,

        Position = 1)]

        [ValidateNotNullOrEmpty()]

        [string]

        $ComputerName = $env:COMPUTERNAME

    )

    Begin

    {

        # Workaround for Exchange 2016 on Windows Server 2016

        Invoke-Exchange2016Workaround

    }

    Process

    {

        try

        {

            # Activate the components

            $paramSetServerComponentState = @{

                identity  = $ComputerName

                Component = 'ServerWideOffline'

                State     = 'Active'

                Requester = 'Maintenance'

            }

            $null = (Set-ServerComponentState @paramSetServerComponentState)

            # Activate the Cluster Node

            $paramResumeClusterNode = @{

                Name          = $ComputerName

                ErrorAction   = 'Stop'

                WarningAction = 'SilentlyContinue'

            }

            $null = (Resume-ClusterNode @paramResumeClusterNode)

            # Activate the Databases

            $paramSetMailboxServer = @{

                identity                                 = $ComputerName

                DatabaseCopyAutoActivationPolicy         = 'Unrestricted'

                DatabaseCopyActivationDisabledAndMoveNow = $false

                ErrorAction                              = 'Stop'

                WarningAction                            = 'SilentlyContinue'

            }

            $null = (Set-MailboxServer @paramSetMailboxServer)

        }

        catch

        {

            return $false

        }

        # Default

        return $true

    }

}

function Test-ExchangeNodeMaintenanceMode

{

    <#

            .SYNOPSIS

            Check if the exchange node is in maintenance mode

            .DESCRIPTION

            Check if the exchange node is in maintenance mode

            .PARAMETER ComputerName

            Name of the Exchange Node, default is local system

            .EXAMPLE

            # Given node is in normal operation mode

            PS C:\> Test-ExchangeNodeMaintenanceMode

            $false

            .EXAMPLE

            # Given node is in maintenance mode

            PS C:\> Test-ExchangeNodeMaintenanceMode

            $true

            .NOTES

            Additional information about the function.

    #>

    [OutputType([bool])]

    param

    (

        [Parameter(ValueFromPipeline = $true,

                ValueFromPipelineByPropertyName = $true,

        Position = 1)]

        [ValidateNotNullOrEmpty()]

        [string]

        $ComputerName = $env:COMPUTERNAME

    )

    Begin

    {

        # Workaround for Exchange 2016 on Windows Server 2016

        Invoke-Exchange2016Workaround

        # Set the Default

        $IsFalse = $false

    }

    Process

    {

        # Wait until all databases are moved

        $paramGetMailboxDatabaseCopyStatus = @{

            server        = $ComputerName

            ErrorAction   = 'Stop'

            WarningAction = 'SilentlyContinue'

        }

        try

        {

            $ActiveDBs = $null

            $ActiveDBs = (Get-MailboxDatabaseCopyStatus @paramGetMailboxDatabaseCopyStatus | Where-Object -FilterScript {

                    $_.Status -eq 'Mounted'

            })

        }

        catch

        {

            $IsFalse = $true

        }

        if ($ActiveDBs)

        {

            $IsFalse = $false

        }

        else

        {

            # Build the URL to check

            $URL = 'https://' + $ComputerName + '/owa/healthcheck.htm'

            # Ignore certificate warning (Will not match anyway)

            try 

            {

                Add-Type -TypeDefinition @'

using System.Net;

using System.Security.Cryptography.X509Certificates;

public class TrustAllCertsPolicy : ICertificatePolicy {

    public bool CheckValidationResult(

        ServicePoint srvPoint, X509Certificate certificate,

        WebRequest request, int certificateProblem) {

        return true;

    }

}

'@

            }

            catch

            {

                Write-Verbose -Message 'Unable to add new Type'

            }

            $paramNewObject = @{

                TypeName      = 'TrustAllCertsPolicy'

                ErrorAction   = 'SilentlyContinue'

                WarningAction = 'SilentlyContinue'

            }

            [Net.ServicePointManager]::CertificatePolicy = (New-Object @paramNewObject)

            try

            {

                $result = $null

                # Get the result

                $paramInvokeWebRequest = @{

                    Uri           = $URL

                    ErrorAction   = 'Stop'

                    WarningAction = 'SilentlyContinue'

                }

                $result = $null

                $result = (Invoke-WebRequest @paramInvokeWebRequest)

            }

            catch

            {

                $IsFalse = $true

            }

            # Check the result

            if ($result.StatusCode -eq '200')

            {

                $IsFalse = $false

            }

        }

    }

    End

    {

        # Default

        return $IsFalse

    }

}

Export-ModuleMember -Function Invoke-Exchange2016Workaround, Set-ExchangeNodeMaintenanceModeOn, Set-ExchangeNodeMaintenanceModeOff, Test-ExchangeNodeMaintenanceMode

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