Examples/EndToEndExample/6-ConfigureDAG.ps1

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<#
.EXAMPLE
    This example shows how to configure DAG.
#>


$ConfigurationData = @{
    AllNodes = @(
        @{
            #region Common Settings for All Nodes
            NodeName        = '*'

            <#
                NOTE! THIS IS NOT RECOMMENDED IN PRODUCTION.
                This is added so that AppVeyor automatic tests can pass, otherwise
                the tests will fail on passwords being in plain text and not being
                encrypted. Because it is not possible to have a certificate in
                AppVeyor to encrypt the passwords we need to add the parameter
                'PSDscAllowPlainTextPassword'.
                NOTE! THIS IS NOT RECOMMENDED IN PRODUCTION.
                See:
                http://blogs.msdn.com/b/powershell/archive/2014/01/31/want-to-secure-credentials-in-windows-powershell-desired-state-configuration.aspx
            #>

            PSDscAllowPlainTextPassword = $true

            <#
                The location of the exported public certifcate which will be used to encrypt
                credentials during compilation.
                CertificateFile = 'C:\public-certificate.cer'
            #>


            #Thumbprint of the certificate being used for decrypting credentials
            Thumbprint      = '39bef4b2e82599233154465323ebf96a12b60673'

            #endregion
        }

        #region Individual Node Settings
        #region DAG01 Nodes
        @{
            NodeName        = 'e15-1'
            Fqdn            = 'e15-1.contoso.local'
            Role            = 'AdditionalDAGMember'
            DAGId           = 'DAG01'
            CASId           = 'Site1CAS'
            ServerNameInCsv = 'e15-1'
        }

        @{
            NodeName        = 'e15-2'
            Fqdn            = 'e15-2.contoso.local'
            Role            = 'AdditionalDAGMember'
            DAGId           = 'DAG01'
            CASId           = 'Site1CAS'
            ServerNameInCsv = 'e15-2'
        }

        @{
            NodeName        = 'e15-3'
            Fqdn            = 'e15-3.contoso.local'
            Role            = 'FirstDAGMember'
            DAGId           = 'DAG01'
            CASId           = 'Site2CAS'
            ServerNameInCsv = 'e15-3'
        }

        @{
            NodeName        = 'e15-4'
            Fqdn            = 'e15-4.contoso.local'
            Role            = 'AdditionalDAGMember'
            DAGId           = 'DAG01'
            CASId           = 'Site2CAS'
            ServerNameInCsv = 'e15-4'
        }
        #endregion
    );

    #region DAG Settings
    DAG01 = @(
        @{
            DAGName                              = 'DAG01'
            AutoDagTotalNumberOfServers          = 12
            AutoDagDatabaseCopiesPerVolume       = 4
            DatabaseAvailabilityGroupIPAddresses = '192.168.1.31','192.168.2.31'
            WitnessServer                        = 'e14-1.contoso.local'
            DbNameReplacements                   = @{"nn" = "01"}
            Thumbprint                           = "0079D0F68F44C7DA5252B4779F872F46DFAF0CBC"
        }
    )
    #endregion

    #region CAS Settings
    #Settings that will apply to all CAS
    AllCAS = @(
        @{
            ExternalNamespace = 'mail.contoso.local'
        }
    )

    #Settings that will apply only to Quincy CAS
    Site1CAS = @(
        @{
            InternalNamespace          = 'mail-site1.contoso.local'
            AutoDiscoverSiteScope      = 'Site1'
            InstantMessagingServerName = 'l15-1.contoso.local'
            DefaultOAB                 = "Default Offline Address Book (Site1)"
        }
    );

    #Settings that will apply only to Phoenix CAS
    Site2CAS = @(
        @{
            InternalNamespace          = 'mail-site2.contoso.local'
            AutoDiscoverSiteScope      = 'Site2'
            InstantMessagingServerName = 'l15-2.contoso.local'
            DefaultOAB                 = "Default Offline Address Book (Site2)"
        }
    );
    #endregion
}

Configuration Example
{
    param
    (
        [Parameter(Mandatory = $true)]
        [ValidateNotNullorEmpty()]
        [System.Management.Automation.PSCredential]
        $ExchangeAdminCredential
    )

    #Import required DSC Modules
    Import-DscResource -Module xExchange

    #This first section only configures a single DAG node, the first member of the DAG.
    #The first member of the DAG will be responsible for DAG creation and maintaining its configuration
    Node $AllNodes.Where{$_.Role -eq 'FirstDAGMember'}.NodeName
    {
        $dagSettings = $ConfigurationData[$Node.DAGId] #Look up and retrieve the DAG settings for this node

        #Create the DAG
        xExchDatabaseAvailabilityGroup DAG
        {
            Name                                 = $dagSettings.DAGName
            Credential                           = $ExchangeAdminCredential
            AutoDagTotalNumberOfServers          = $dagSettings.AutoDagTotalNumberOfServers
            AutoDagDatabaseCopiesPerVolume       = $dagSettings.AutoDagDatabaseCopiesPerVolume
            AutoDagDatabasesRootFolderPath       = 'C:\ExchangeDatabases'
            AutoDagVolumesRootFolderPath         = 'C:\ExchangeVolumes'
            DatacenterActivationMode             = "DagOnly"
            DatabaseAvailabilityGroupIPAddresses = $dagSettings.DatabaseAvailabilityGroupIPAddresses
            ManualDagNetworkConfiguration        = $false
            ReplayLagManagerEnabled              = $true
            SkipDagValidation                    = $true
            WitnessDirectory                     = 'C:\FSW'
            WitnessServer                        = $dagSettings.WitnessServer
        }

        #Add this server as member
        xExchDatabaseAvailabilityGroupMember DAGMember
        {
            MailboxServer     = $Node.NodeName
            Credential        = $ExchangeAdminCredential
            DAGName           = $dagSettings.DAGName
            SkipDagValidation = $true
            DependsOn         = '[xExchDatabaseAvailabilityGroup]DAG'
        }
    }

    #Next we'll add the remaining nodes to the DAG
    Node $AllNodes.Where{$_.Role -eq 'AdditionalDAGMember'}.NodeName
    {
        $dagSettings = $ConfigurationData[$Node.DAGId] #Look up and retrieve the DAG settings for this node

        #Can't join until the DAG exists...
        xExchWaitForDAG WaitForDAG
        {
            Identity         = $dagSettings.DAGName
            Credential       = $ExchangeAdminCredential
        }

        xExchDatabaseAvailabilityGroupMember DAGMember
        {
            MailboxServer     = $Node.NodeName
            Credential        = $ExchangeAdminCredential
            DAGName           = $dagSettings.DAGName
            SkipDagValidation = $true
            DependsOn         = '[xExchWaitForDAG]WaitForDAG'
        }
    }
}