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dscbot edited this page Jan 20, 2024 · 11 revisions

SqlAG

Parameters

Parameter Attribute DataType Description Allowed Values
Name Key String Specifies the name of the availability group.
ServerName Required String Hostname of the SQL Server to be configured.
InstanceName Key String Name of the SQL instance to be configured.
Ensure Write String Specifies if the availability group should be present or absent. Default value is 'Present'. Present, Absent
AutomatedBackupPreference Write String Specifies the automated backup preference for the availability group. When creating a group the default is 'None'. Primary, SecondaryOnly, Secondary, None
AvailabilityMode Write String Specifies the replica availability mode. When creating a group 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 group the default is 50.
BasicAvailabilityGroup Write Boolean Specifies the type of availability group is Basic. This is only available is SQL Server 2016 and later and is ignored when applied to previous versions.
DatabaseHealthTrigger Write Boolean Specifies if the option Database Level Health Detection is enabled. This is only available is SQL Server 2016 and later and is ignored when applied to previous versions.
DtcSupportEnabled Write Boolean Specifies if the option Database DTC Support is enabled. This is only available is SQL Server 2016 and later and is ignored when applied to previous versions. This can not be altered once the availability group is created and is ignored if it is the case.
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.
FailureConditionLevel Write String Specifies the automatic failover behavior of the availability group. OnServerDown, OnServerUnresponsive, OnCriticalServerErrors, OnModerateServerErrors, OnAnyQualifiedFailureCondition
FailoverMode Write String Specifies the failover mode. When creating a group the default is 'Manual'. Automatic, Manual
SeedingMode Write String Specifies the seeding mode. When creating a group the default is 'Manual'. Automatic, Manual
HealthCheckTimeout Write UInt32 Specifies the length of time, in milliseconds, after which AlwaysOn Availability Groups declare an unresponsive server to be unhealthy. When creating a group the default is 30000.
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.
EndpointUrl Read String Returns the URL of the availability group replica endpoint.
EndpointPort Read UInt32 Returns the port the database mirroring endpoint is listening on.
Version Read UInt32 Returns the major version of the SQL Server instance.
IsActiveNode Read Boolean Returns if the current node is actively hosting the SQL Server instance.

Description

The SqlAG DSC resource is used to create, remove, and update an Always On Availability Group. It will also manage the Availability Group replica on the specified node.

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.

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 'TestAG' exists.

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
        }

        # Ensure the HADR option is enabled for the instance
        SqlAlwaysOnService 'EnableHADR'
        {
            Ensure               = 'Present'
            InstanceName         = 'MSSQLSERVER'
            ServerName           = $Node.NodeName

            PsDscRunAsCredential = $SqlAdministratorCredential
        }

        # Create the availability group on the instance tagged as the primary replica
        SqlAG 'AddTestAG'
        {
            Ensure               = 'Present'
            Name                 = 'TestAG'
            InstanceName         = 'MSSQLSERVER'
            ServerName           = $Node.NodeName

            DependsOn            = '[SqlAlwaysOnService]EnableHADR', '[SqlEndpoint]HADREndpoint', '[SqlPermission]AddNTServiceClusSvcPermissions'

            PsDscRunAsCredential = $SqlAdministratorCredential
        }
    }
}

Example 2

This example shows how to ensure that the Availability Group 'TestAG' does not exist.

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

    Import-DscResource -ModuleName 'SqlServerDsc'

    Node $AllNodes.NodeName
    {
        # Create the availability group on the instance tagged as the primary replica
        SqlAG 'RemoveTestAG'
        {
            Ensure               = 'Absent'
            Name                 = 'TestAG'
            InstanceName         = 'MSSQLSERVER'
            ServerName           = $Node.NodeName

            PsDscRunAsCredential = $SqlAdministratorCredential
        }
    }
}

Example 3

This example shows how to ensure that the Availability Group 'TestAG' exists.

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
        }

        SqlAG 'AddTestAG'
        {
            Ensure                        = 'Present'
            Name                          = 'TestAG'
            InstanceName                  = 'MSSQLSERVER'
            ServerName                    = $Node.NodeName
            ProcessOnlyOnActiveNode       = $true

            AutomatedBackupPreference     = 'Primary'
            AvailabilityMode              = 'SynchronousCommit'
            BackupPriority                = 50
            ConnectionModeInPrimaryRole   = 'AllowAllConnections'
            ConnectionModeInSecondaryRole = 'AllowNoConnections'
            FailoverMode                  = 'Automatic'
            HealthCheckTimeout            = 15000

            # SQl Server 2016 or later only
            BasicAvailabilityGroup        = $false
            DatabaseHealthTrigger         = $true
            DtcSupportEnabled             = $true

            DependsOn                     = '[SqlAlwaysOnService]EnableHADR', '[SqlEndpoint]HADREndpoint', '[SqlPermission]AddNTServiceClusSvcPermissions'

            PsDscRunAsCredential          = $SqlAdministratorCredential
        }
    }
}

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