SqlAGReplica

SqlAGReplica

Parameters

Parameter	Attribute	DataType	Description	Allowed Values
Name	Key	String	The name of the availability group replica. For named instances this must be in the following format 'ServerName\InstanceName'.
AvailabilityGroupName	Key	String	The name of the availability group.
ServerName	Required	String	Hostname of the SQL Server to be configured.
InstanceName	Key	String	Name of the SQL Server instance to be configured.
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.
PrimaryReplicaInstanceName	Write	String	Name of the SQL Server Database Engine instance where the primary replica lives.
Ensure	Write	String	Specifies if the availability group replica should be present or absent. Default value is 'Present'.	Present, Absent
AvailabilityMode	Write	String	Specifies the replica availability mode. When creating a replica the default is 'AsynchronousCommit'.	AsynchronousCommit, SynchronousCommit
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.
ConnectionModeInPrimaryRole	Write	String	Specifies how the availability replica handles connections when in the primary role.	AllowAllConnections, AllowReadWriteConnections
ConnectionModeInSecondaryRole	Write	String	Specifies how the availability replica handles connections when in the secondary role.	AllowNoConnections, AllowReadIntentConnectionsOnly, AllowAllConnections
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.
FailoverMode	Write	String	Specifies the failover mode. When creating a replica the default value is 'Manual'.	Automatic, Manual
ReadOnlyRoutingConnectionUrl	Write	String	Specifies the fully qualified domain name (FQDN) and port to use when routing to the replica for read only connections.
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.
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.
SeedingMode	Write	String	Specifies the seeding mode. When creating a replica the default value is 'Manual'.	Automatic, Manual
EndpointPort	Read	UInt16	Returns the network port the endpoint is listening on.
EndpointUrl	Read	String	Returns the URL of the availability group replica endpoint.
IsActiveNode	Read	Boolean	Returns if the current node is actively hosting the SQL Server Database Engine instance.

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 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 here for all open issues.

Examples

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
        }
    }
}