xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership: Make Cluster A…

…ware (#895) - Changes to xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership - Made the resource cluster aware. When ProcessOnlyOnActiveNode is specified, the resource will only determine if a change is needed if the target node is the active host of the SQL Server instance (issue #869).
dsccommunity · Oct 30, 2017 · 88bcd27 · 88bcd27
1 parent 6e80bab
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -23,6 +23,10 @@
   - Made the resource cluster aware. When ProcessOnlyOnActiveNode is specified,
     the resource will only determine if a change is needed if the target node
     is the active host of the SQL Server instance ([issue #868](https://github.com/PowerShell/xSQLServer/issues/868)).
+- Changes to xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership
+  - Made the resource cluster aware. When ProcessOnlyOnActiveNode is specified,
+    the resource will only determine if a change is needed if the target node
+    is the active host of the SQL Server instance ([issue #869](https://github.com/PowerShell/xSQLServer/issues/869)).
 - Changes to xSQLServerAlwaysOnAvailabilityGroupReplica
   - Made the resource cluster aware. When ProcessOnlyOnActiveNode is specified,
     the resource will only determine if a change is needed if the target node is

diff --git a/...tyGroupDatabaseMembership/MSFT_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership.psm1 b/...tyGroupDatabaseMembership/MSFT_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership.psm1
@@ -68,11 +68,15 @@ function Get-TargetResource
         Ensure                = ''
         Force                 = $false
         MatchDatabaseOwner    = $false
+        IsActiveNode          = $false
     }
 
     # Connect to the instance
     $serverObject = Connect-SQL -SQLServer $SQLServer -SQLInstanceName $SQLInstanceName
 
+    # Is this node actively hosting the SQL instance?
+    $currentConfiguration.IsActiveNode = Test-ActiveNode -ServerObject $serverObject
+
     # Get the Availability group object
     $availabilityGroup = $serverObject.AvailabilityGroups[$AvailabilityGroupName]
 
@@ -139,6 +143,10 @@ function Get-TargetResource
         If set to $false, the owner of the database will be the PSDscRunAsCredential.
 
         The default is '$true'.
+
+    .PARAMETER ProcessOnlyOnActiveNode
+        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.
+        Not used in Set-TargetResource.
 #>
 function Set-TargetResource
 {
@@ -176,7 +184,11 @@ function Set-TargetResource
 
         [Parameter()]
         [Boolean]
-        $MatchDatabaseOwner
+        $MatchDatabaseOwner,
+
+        [Parameter()]
+        [Boolean]
+        $ProcessOnlyOnActiveNode
     )
 
     Import-SQLPSModule
@@ -597,6 +609,9 @@ function Set-TargetResource
         If set to $false, the owner of the database will be the PSDscRunAsCredential.
 
         The default is '$true'.
+
+    .PARAMETER ProcessOnlyOnActiveNode
+        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.
 #>
 function Test-TargetResource
 {
@@ -635,7 +650,11 @@ function Test-TargetResource
 
         [Parameter()]
         [Boolean]
-        $MatchDatabaseOwner
+        $MatchDatabaseOwner,
+
+        [Parameter()]
+        [Boolean]
+        $ProcessOnlyOnActiveNode
     )
 
     $configurationInDesiredState = $true
@@ -649,6 +668,16 @@ function Test-TargetResource
     }
     $currentConfiguration = Get-TargetResource @getTargetResourceParameters
 
+    <#
+        If this is supposed to process only the active node, and this is not the
+        active node, don't bother evaluating the test.
+    #>
+    if ( $ProcessOnlyOnActiveNode -and -not $currentConfiguration.IsActiveNode )
+    {
+        Write-Verbose -Message ( $script:localizedData.NotActiveNode -f $env:COMPUTERNAME,$SQLInstanceName )
+        return $configurationInDesiredState
+    }
+
     # Connect to the defined instance
     $serverObject = Connect-SQL -SQLServer $SQLServer -SQLInstanceName $SQLInstanceName
 

diff --git a/...pDatabaseMembership/MSFT_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership.schema.mof b/...pDatabaseMembership/MSFT_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership.schema.mof
@@ -9,4 +9,6 @@ class MSFT_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership : OMI_BaseResou
     [Write, Description("Specifies the membership of the database(s) in the availability group. The options are: Present: The defined database(s) are added to the availability group. All other databases that may be a member of the availability group are ignored. Absent: The defined database(s) are removed from the availability group. All other databases that may be a member of the availability group are ignored. The default is 'Present'."), ValueMap{"Present","Absent"}, Values{"Present","Absent"}] String Ensure;
     [Write, Description("When used with 'Ensure = 'Present'' it ensures the specified database(s) are the only databases that are a member of the specified Availability Group. This parameter is ignored when 'Ensure' is 'Absent'.")] Boolean Force;
     [Write, Description("If set to $true, this ensures the database owner of the database on the primary replica is the owner of the database on all secondary replicas. This requires the database owner is available as a login on all replicas and that the PSDscRunAsAccount has impersonate permissions. If set to $false, the owner of the database will be the PSDscRunAsAccount. The default is '$true'")] Boolean MatchDatabaseOwner;
+    [Write, Description("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.")] Boolean ProcessOnlyOnActiveNode;
+    [Read, Description("Determines if the current node is actively hosting the SQL Server instance.")] Boolean IsActiveNode;
 };
diff --git a/...eMembership/en-US/MSFT_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership.strings.psd1 b/...eMembership/en-US/MSFT_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership.strings.psd1
@@ -8,6 +8,7 @@ ConvertFrom-StringData @'
     DatabaseShouldNotBeMember = The following databases should not be a member of the availability group '{0}': {1}.
     DatabasesNotFound = The following databases were not found in the instance: {0}.
     ImpersonatePermissionsMissing = The login '{0}' is missing impersonate permissions in the instances '{1}'.
+    NotActiveNode = The node '{0}' is not actively hosting the instance '{1}'. Exiting the test.
     ParameterNotOfType = The parameter '{0}' is not of the type '{1}'.
     ParameterNullOrEmpty = The parameter '{0}' is NULL or empty.
     RemovingDatabasesToAvailabilityGroup = Removing the following databases from the '{0}' availability group: {1}.

diff --git a/...baseMembership/en-US/about_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership.help.txt b/...baseMembership/en-US/about_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership.help.txt
@@ -45,3 +45,6 @@ PARAMETER MatchDatabaseOwner
     If set to $false, the owner of the database will be the PSDscRunAsCredential.
 
     The default is '$true'.
+
+.PARAMETER ProcessOnlyOnActiveNode
+        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.
diff --git a/...QLServerAlwaysOnAvailabilityGroupDatabaseMembership/1-AddDatabasesToAvailabilityGroup.ps1 b/...QLServerAlwaysOnAvailabilityGroupDatabaseMembership/1-AddDatabasesToAvailabilityGroup.ps1
@@ -1,6 +1,11 @@
 <#
 .EXAMPLE
     This example shows how to ensure that the databases 'DB*' and 'AdventureWorks' are members 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.
 #>
 
 $ConfigurationData = @{
@@ -101,13 +106,14 @@ Configuration Example
         {
             xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership 'TestAGDatabaseMemberships'
             {
-                AvailabilityGroupName = $Node.AvailabilityGroupName
-                BackupPath            = '\\SQL1\AgInitialize'
-                DatabaseName          = 'DB*', 'AdventureWorks'
-                SQLInstanceName       = $Node.SQLInstanceName
-                SQLServer             = $Node.NodeName
-                Ensure                = 'Present'
-                PsDscRunAsCredential  = $SysAdminAccount
+                AvailabilityGroupName   = $Node.AvailabilityGroupName
+                BackupPath              = '\\SQL1\AgInitialize'
+                DatabaseName            = 'DB*', 'AdventureWorks'
+                SQLInstanceName         = $Node.SQLInstanceName
+                SQLServer               = $Node.NodeName
+                Ensure                  = 'Present'
+                ProcessOnlyOnActiveNode = $true
+                PsDscRunAsCredential    = $SysAdminAccount
             }
         }
     }

diff --git a/README.md b/README.md
@@ -314,6 +314,14 @@ group.
   login on all replicas and that the PSDscRunAsAccount has impersonate permissions.
   If set to $false, the owner of the database will be the PSDscRunAsAccount.
   The default is '$true'.
+* **`[Boolean]` ProcessOnlyOnActiveNode** _(Write)_: 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.
+
+#### Read-Only Properties from Get-TargetResource
+
+* **`[Boolean]` IsActiveNode** _(Read)_: Determines if the current node is
+  actively hosting the SQL Server instance.
 
 ### xSQLServerAlwaysOnAvailabilityGroupReplica
 

diff --git a/Tests/Unit/MSFT_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership.Tests.ps1 b/Tests/Unit/MSFT_xSQLServerAlwaysOnAvailabilityGroupDatabaseMembership.Tests.ps1
@@ -56,6 +56,8 @@ try
 
             $mockBackupPath = 'X:\Backup'
 
+            $mockProcessOnlyOnActiveNode = $false
+
         #endregion Parameter Mocks
 
         #region mock names
@@ -1140,6 +1142,9 @@ WITH NORECOVERY'
                 Mock -CommandName Connect-SQL -MockWith { return $mockServerObject } -Verifiable
                 Mock -CommandName Get-PrimaryReplicaServerObject -MockWith { return $mockServerObject } -Verifiable -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server1' }
                 Mock -CommandName Get-PrimaryReplicaServerObject -MockWith { return $mockServer2Object } -Verifiable -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server2' }
+                Mock -CommandName Test-ActiveNode -MockWith {
+                    return -not $mockProcessOnlyOnActiveNode
+                } -Verifiable
             }
 
             BeforeEach {
@@ -1152,6 +1157,7 @@ WITH NORECOVERY'
                     Ensure = 'Present'
                     Force = $false
                     MatchDatabaseOwner = $false
+                    ProcessOnlyOnActiveNode = $false
                 }
             }
 
@@ -1164,6 +1170,7 @@ WITH NORECOVERY'
                     Assert-MockCalled -CommandName Connect-SQL -Scope It -Times 2 -Exactly
                     Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 1 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server1' }
                     Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 0 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server2' }
+                    Assert-MockCalled -CommandName Test-ActiveNode -Scope It -Times 1 -Exactly
                 }
 
                 It 'Should return $false when the specified availability group is not found' {
@@ -1174,6 +1181,7 @@ WITH NORECOVERY'
                     Assert-MockCalled -CommandName Connect-SQL -Scope It -Times 2 -Exactly
                     Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 0 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server1' }
                     Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 0 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server2' }
+                    Assert-MockCalled -CommandName Test-ActiveNode -Scope It -Times 1 -Exactly
                 }
 
                 It 'Should return $false when no matching databases are found' {
@@ -1184,6 +1192,7 @@ WITH NORECOVERY'
                     Assert-MockCalled -CommandName Connect-SQL -Scope It -Times 2 -Exactly
                     Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 1 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server1' }
                     Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 0 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server2' }
+                    Assert-MockCalled -CommandName Test-ActiveNode -Scope It -Times 1 -Exactly
                 }
 
                 It 'Should return $false when databases are found to add to the availability group' {
@@ -1192,6 +1201,7 @@ WITH NORECOVERY'
                     Assert-MockCalled -CommandName Connect-SQL -Scope It -Times 2 -Exactly
                     Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 1 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server1' }
                     Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 0 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server2' }
+                    Assert-MockCalled -CommandName Test-ActiveNode -Scope It -Times 1 -Exactly
                 }
 
                 It 'Should return $true when the configuration is in the desired state and the primary replica is on another server' {
@@ -1203,6 +1213,21 @@ WITH NORECOVERY'
                     Assert-MockCalled -CommandName Connect-SQL -Scope It -Times 2 -Exactly
                     Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 0 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server1' }
                     Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 1 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server2' }
+                    Assert-MockCalled -CommandName Test-ActiveNode -Scope It -Times 1 -Exactly
+                }
+
+                It 'Should return $true when ProcessOnlyOnActiveNode is "$true" and the current node is not actively hosting the instance' {
+                    $mockProcessOnlyOnActiveNode = $true
+
+                    $mockTestTargetResourceParameters.DatabaseName = $mockAvailabilityDatabaseNames.Clone()
+                    $mockTestTargetResourceParameters.ProcessOnlyOnActiveNode = $mockProcessOnlyOnActiveNode
+
+                    Test-TargetResource @mockTestTargetResourceParameters | Should -Be $true
+
+                    Assert-MockCalled -CommandName Connect-SQL -Scope It -Times 1 -Exactly
+                    Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 0 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server1' }
+                    Assert-MockCalled -CommandName Get-PrimaryReplicaServerObject -Scope It -Times 0 -Exactly -ParameterFilter { $AvailabilityGroup.PrimaryReplicaServerName -eq 'Server2' }
+                    Assert-MockCalled -CommandName Test-ActiveNode -Scope It -Times 1 -Exactly
                 }
             }