DSCResources/DSC_SqlAGReplica/en-US/about_SqlAGReplica.help.txt

.NAME
    SqlAGReplica
 
.DESCRIPTION
    The SqlAGReplica DSC resource is used to create, remove, and update an
    Always On Availability Group Replica.
 
    ## Requirements
 
    * Target machine must be running Windows Server 2012 or later.
    * Target machine must be running SQL Server Database Engine 2012 or later.
    * 'NT SERVICE\ClusSvc' or 'NT AUTHORITY\SYSTEM' must have the 'Connect SQL',
      'Alter Any Availability Group', and 'View Server State' permissions.
    * There are circumstances where the PowerShell module SQLPS that is install
      together with SQL Server does not work with all features of this resource.
      The solution is to install the PowerShell module https://www.powershellgallery.com/packages/SqlServer
      from the PowerShell Gallery. The module must be installed in a machine-wide
      path of env:PSModulePath so it is found when LCM runs the DSC resource.
      This will also make all SqlServerDsc DSC resources use the PowerShell
      module SqlServer instead of the PowerShell module SQLPS.
 
    ## Known issues
 
    All issues are not listed here, see https://github.com/dsccommunity/SqlServerDsc/issues?q=is%3Aissue+is%3Aopen+in%3Atitle+SqlAGReplica.
 
.PARAMETER Name
    Key - String
    The name of the availability group replica. For named instances this must be in the following format 'ServerName\InstanceName'.
 
.PARAMETER AvailabilityGroupName
    Key - String
    The name of the availability group.
 
.PARAMETER ServerName
    Required - String
    Hostname of the SQL Server to be configured.
 
.PARAMETER InstanceName
    Key - String
    Name of the SQL Server instance to be configured.
 
.PARAMETER PrimaryReplicaServerName
    Write - String
    Hostname of the SQL Server where the primary replica is expected to be active. If the primary replica is not found here, the resource will attempt to find the host that holds the primary replica and connect to it.
 
.PARAMETER PrimaryReplicaInstanceName
    Write - String
    Name of the SQL Server Database Engine instance where the primary replica lives.
 
.PARAMETER Ensure
    Write - String
    Allowed values: Present, Absent
    Specifies if the availability group replica should be present or absent. Default value is 'Present'.
 
.PARAMETER AvailabilityMode
    Write - String
    Allowed values: AsynchronousCommit, SynchronousCommit
    Specifies the replica availability mode. When creating a replica the default is 'AsynchronousCommit'.
 
.PARAMETER BackupPriority
    Write - UInt32
    Specifies the desired priority of the replicas in performing backups. The acceptable values for this parameter are: integers from 0 through 100. Of the set of replicas which are online and available, the replica that has the highest priority performs the backup. When creating a replica the default is 50.
 
.PARAMETER ConnectionModeInPrimaryRole
    Write - String
    Allowed values: AllowAllConnections, AllowReadWriteConnections
    Specifies how the availability replica handles connections when in the primary role.
 
.PARAMETER ConnectionModeInSecondaryRole
    Write - String
    Allowed values: AllowNoConnections, AllowReadIntentConnectionsOnly, AllowAllConnections
    Specifies how the availability replica handles connections when in the secondary role.
 
.PARAMETER EndpointHostName
    Write - String
    Specifies the hostname or IP address of the availability group replica endpoint. When creating a group the default is the instance network name which is set in the code because the value can only be determined when connected to the SQL Server instance.
 
.PARAMETER FailoverMode
    Write - String
    Allowed values: Automatic, Manual
    Specifies the failover mode. When creating a replica the default value is 'Manual'.
 
.PARAMETER ReadOnlyRoutingConnectionUrl
    Write - String
    Specifies the fully qualified domain name (FQDN) and port to use when routing to the replica for read only connections.
 
.PARAMETER ReadOnlyRoutingList
    Write - StringArray
    Specifies an ordered list of replica server names that represent the probe sequence for connection director to use when redirecting read-only connections through this availability replica. This parameter applies if the availability replica is the current primary replica of the availability group.
 
.PARAMETER ProcessOnlyOnActiveNode
    Write - Boolean
    Specifies that the resource will only determine if a change is needed if the target node is the active host of the SQL Server instance.
 
.PARAMETER SeedingMode
    Write - String
    Allowed values: Automatic, Manual
    Specifies the seeding mode. When creating a replica the default value is 'Manual'.
 
.PARAMETER EndpointPort
    Read - UInt16
    Returns the network port the endpoint is listening on.
 
.PARAMETER EndpointUrl
    Read - String
    Returns the URL of the availability group replica endpoint.
 
.PARAMETER IsActiveNode
    Read - Boolean
    Returns if the current node is actively hosting the SQL Server Database Engine instance.
 
.EXAMPLE 1
 
This example shows how to ensure that the Availability Group Replica 'SQL2'
exists in the Availability Group 'TestAG'.
 
In the event this is applied to a Failover Cluster Instance (FCI), the
ProcessOnlyOnActiveNode property will tell the Test-TargetResource function
to evaluate if any changes are needed if the node is actively hosting the
SQL Server Instance.
 
Configuration Example
{
    param
    (
        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $SqlAdministratorCredential
    )
 
    Import-DscResource -ModuleName 'SqlServerDsc'
 
    Node $AllNodes.NodeName
    {
        # Adding the required service account to allow the cluster to log into SQL
        SqlLogin 'AddNTServiceClusSvc'
        {
            Ensure = 'Present'
            Name = 'NT SERVICE\ClusSvc'
            LoginType = 'WindowsUser'
            ServerName = $Node.NodeName
            InstanceName = 'MSSQLSERVER'
 
            PsDscRunAsCredential = $SqlAdministratorCredential
        }
 
        # Add the required permissions to the cluster service login
        SqlPermission 'AddNTServiceClusSvcPermissions'
        {
            DependsOn = '[SqlLogin]AddNTServiceClusSvc'
            ServerName = $Node.NodeName
            InstanceName = 'MSSQLSERVER'
            Name = 'NT SERVICE\ClusSvc'
            Credential = $SqlAdministratorCredential
            Permission = @(
                ServerPermission
                {
                    State = 'Grant'
                    Permission = @('AlterAnyAvailabilityGroup', 'ViewServerState')
                }
                ServerPermission
                {
                    State = 'GrantWithGrant'
                    Permission = @()
                }
                ServerPermission
                {
                    State = 'Deny'
                    Permission = @()
                }
            )
        }
 
        # Create a DatabaseMirroring endpoint
        SqlEndpoint 'HADREndpoint'
        {
            EndPointName = 'HADR'
            EndpointType = 'DatabaseMirroring'
            Ensure = 'Present'
            Port = 5022
            ServerName = $Node.NodeName
            InstanceName = 'MSSQLSERVER'
 
            PsDscRunAsCredential = $SqlAdministratorCredential
        }
 
        SqlAlwaysOnService EnableHADR
        {
            Ensure = 'Present'
            InstanceName = 'MSSQLSERVER'
            ServerName = $Node.NodeName
 
            PsDscRunAsCredential = $SqlAdministratorCredential
        }
 
        # Add the availability group replica to the availability group
        SqlAGReplica 'AddReplica'
        {
            Ensure = 'Present'
            Name = $Node.NodeName
            AvailabilityGroupName = 'TestAG'
            ServerName = $Node.NodeName
            InstanceName = 'MSSQLSERVER'
            PrimaryReplicaServerName = 'SQL1'
            PrimaryReplicaInstanceName = 'MSSQLSERVER'
            ProcessOnlyOnActiveNode = $true
 
            DependsOn = '[SqlAlwaysOnService]EnableHADR'
 
            PsDscRunAsCredential = $SqlAdministratorCredential
        }
    }
}
 
.EXAMPLE 2
 
This example shows how to ensure that the Availability Group Replica 'SQL2'
does not exist in the Availability Group 'TestAG'.
 
Configuration Example
{
    param
    (
        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $SqlAdministratorCredential
    )
 
    Import-DscResource -ModuleName 'SqlServerDsc'
 
    Node $AllNodes.NodeName
    {
        # Add the availability group replica to the availability group
        SqlAGReplica 'RemoveReplica'
        {
            Ensure = 'Absent'
            Name = $Node.NodeName
            AvailabilityGroupName = 'TestAG'
            ServerName = $Node.NodeName
            InstanceName = 'MSSQLSERVER'
            PrimaryReplicaServerName = 'SQL1'
            PrimaryReplicaInstanceName = 'MSSQLSERVER'
 
            PsDscRunAsCredential = $SqlAdministratorCredential
        }
    }
}