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feat: Added Azure.PostgreSQL.ZoneRedundantHA (Azure#2933)
* feat: Added Azure.PostgreSQL.ZoneRedundantHA * Minor updates --------- Co-authored-by: Bernie White <[email protected]>
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‎docs/CHANGELOG-v1.md

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@@ -37,10 +37,11 @@ What's changed since v1.37.0:
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[#2916](https://github.com/Azure/PSRule.Rules.Azure/issues/2916)
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- Verify that servers have zone-redundant high availability (HA) configured by @BenjaminEngeset.
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[#2914](https://github.com/Azure/PSRule.Rules.Azure/issues/2914)
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- Azure Database for PostgreSQL:
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- Verify that Azure Database for PostgreSQL servers have a customer-controlled maintenance window configured by @BenjaminEngeset.
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[#2927](https://github.com/Azure/PSRule.Rules.Azure/issues/2927)
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- Verify that servers have zone-redundant high availability (HA) configured by @BenjaminEngeset.
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[#2932](https://github.com/Azure/PSRule.Rules.Azure/issues/2932)
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- Azure Firewall:
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- Verify that firewalls have availability zones configured by @BenjaminEngeset.
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[#2909](https://github.com/Azure/PSRule.Rules.Azure/issues/2909)

‎docs/en/rules/Azure.PostgreSQL.ZoneRedundantHA.md

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---
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severity: Important
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pillar: Reliability
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category: RE:05 Regions and availability zones
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resource: Azure Database for PostgreSQL
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online version: https://azure.github.io/PSRule.Rules.Azure/en/rules/Azure.PostgreSQL.ZoneRedundantHA/
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---
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# Zone-Redundant High Availability
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## SYNOPSIS
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Deploy Azure Database for PostgreSQL servers using zone-redundant high availability (HA) in supported regions to ensure high availability and resilience.
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## DESCRIPTION
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Azure Database for PostgreSQL flexible servers allows configuration high availability (HA) across availability zones in supported regions.
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Using availability zones improves resiliency of your solution to failures or disruptions isolated to a zone or data center.
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Zone-redundant HA works by:
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- Deploying two servers; a primary in one zone, and a secondary in a physically separate zone.
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- Daily Data Backups: Performed from the primary server and stored using zone-redundant backup storage.
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- Transaction Logs: Continuously archived in zone-redundant backup storage from the standby replica.
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The failover process ensures continuous operation by switching from the primary server to the standby replica server.
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This process can be:
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- Manual (Planned) Failover: Initiated by the user for maintenance or other operational reasons.
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- Automatic (Unplanned) Failover: Triggered by Azure in response to failures such as hardware or network issues affecting the primary server.
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Before opting for the zone-redundant HA model, review the documentation for additional limitations and critical information.
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This includes understanding the latency impact between zones, cost implications, and any specific regional support constraints.
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## RECOMMENDATION
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Consider deploying flexible servers using zone-redundant high-availability to improve the resiliency of your databases.
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## EXAMPLES
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### Configure with Azure template
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To configure servers that pass this rule:
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- Set the `properties.highAvailability.mode` property to `ZoneRedundant`.
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For example:
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```json
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{
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"type": "Microsoft.DBforPostgreSQL/flexibleServers",
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"apiVersion": "2023-03-01-preview",
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"name": "[parameters('serverName')]",
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"location": "[parameters('location')]",
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"sku": {
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"name": "Standard_D16as",
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"tier": "GeneralPurpose"
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},
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"properties": {
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"administratorLogin": "[parameters('administratorLogin')]",
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"administratorLoginPassword": "[parameters('administratorLoginPassword')]",
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"createMode": "Default",
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"version": "[parameters('postgresqlVersion')]",
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"availabilityZone": "1",
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"highAvailability": {
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"mode": "ZoneRedundant",
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"standbyAvailabilityZone": "2"
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}
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}
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}
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```
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### Configure with Bicep
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To configure servers that pass this rule:
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- Set the `properties.highAvailability.mode` property to `ZoneRedundant`.
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For example:
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```bicep
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resource postgresqlDbServer 'Microsoft.DBforPostgreSQL/flexibleServers@2023-03-01-preview' = {
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name: serverName
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location: location
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sku: {
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name: 'Standard_D16as'
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tier: 'GeneralPurpose'
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}
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properties: {
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administratorLogin: administratorLogin
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administratorLoginPassword: administratorLoginPassword
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createMode: 'Default'
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version: postgresqlVersion
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availabilityZone: 1
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highAvailability: {
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mode: 'ZoneRedundant'
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standbyAvailabilityZone: 2
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}
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}
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}
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```
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<!-- external:avm avm/res/db-for-postgre-sql/flexible-server highAvailability -->
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## NOTES
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The `Burstable` SKU tier is not supported.
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The zone-redundancy HA model is only available in regions that support availability zones.
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## LINKS
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- [RE:05 Regions and availability zones](https://learn.microsoft.com/azure/well-architected/reliability/regions-availability-zones)
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- [High availability concepts in Azure Database for PostgreSQL](https://learn.microsoft.com/azure/reliability/reliability-postgresql-flexible-server)
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- [Zone-redundant HA architecture](https://learn.microsoft.com/azure/reliability/reliability-postgresql-flexible-server#availability-zone-support)
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- [Azure deployment reference](https://learn.microsoft.com/azure/templates/microsoft.dbforpostgresql/flexibleservers)

‎src/PSRule.Rules.Azure/rules/Azure.PostgreSQL.Rule.ps1

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@@ -82,6 +82,25 @@ Rule 'Azure.PostgreSQL.AAD' -Ref 'AZR-000389' -Type 'Microsoft.DBforPostgreSQL/f
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}
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}
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# Synopsis: Deploy Azure Database for PostgreSQL servers using zone-redundant high availability (HA) in supported regions to ensure high availability and resilience.
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Rule 'Azure.PostgreSQL.ZoneRedundantHA' -Ref 'AZR-000434' -Type 'Microsoft.DBforPostgreSQL/flexibleServers' -Tag @{ release = 'GA'; ruleSet = '2024_06 '; 'Azure.WAF/pillar' = 'Reliability'; } {
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# Check if the region supports availability zones.
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$provider = [PSRule.Rules.Azure.Runtime.Helper]::GetResourceType('Microsoft.DBforPostgreSQL', 'flexibleServers')
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$availabilityZones = GetAvailabilityZone -Location $TargetObject.Location -Zone $provider.ZoneMappings
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# Don't flag if the region does not support availability zones.
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if (-not $availabilityZones) {
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return $Assert.Pass()
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}
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$supportedSku = @('GeneralPurpose', 'MemoryOptimized')
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if ($TargetObject.sku.tier -notin $supportedSku) {
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return $Assert.In($TargetObject, 'sku.tier', $supportedSku) # Zone-redundant HA is only supported for the GeneralPurpose and MemoryOptimized SKU tiers.
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}
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$Assert.HasFieldValue($TargetObject, 'properties.highAvailability.mode', 'ZoneRedundant')
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}
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#endregion SQL Managed Instance
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#region Helper functions

‎tests/PSRule.Rules.Azure.Tests/Azure.PostgreSQL.Tests.ps1

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@@ -128,8 +128,8 @@ Describe 'Azure.PostgreSQL' -Tag 'PostgreSQL' {
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# Fail
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$ruleResult = @($filteredResult | Where-Object { $_.Outcome -eq 'Fail' });
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$ruleResult | Should -Not -BeNullOrEmpty;
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$ruleResult.Length | Should -Be 5;
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$ruleResult.TargetName | Should -BeIn 'server-A', 'server-B', 'server-E', 'server-F', 'server-G';
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$ruleResult.Length | Should -Be 7;
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$ruleResult.TargetName | Should -BeIn 'server-A', 'server-B', 'server-E', 'server-F', 'server-G', 'server-H', 'server-I';
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$ruleResult[0].Reason | Should -BeExactly "The Azure Database for PostgreSQL 'server-B' should have geo-redundant backup configured.";
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$ruleResult[1].Reason | Should -BeExactly "The Azure Database for PostgreSQL 'server-A' should have geo-redundant backup configured.";
@@ -168,8 +168,8 @@ Describe 'Azure.PostgreSQL' -Tag 'PostgreSQL' {
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# Fail
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$ruleResult = @($filteredResult | Where-Object { $_.Outcome -eq 'Fail' });
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$ruleResult | Should -Not -BeNullOrEmpty;
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$ruleResult.Length | Should -Be 7;
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$ruleResult.TargetName | Should -BeIn 'server-A', 'server-B', 'server-D', 'server-E', 'server-G', 'ActiveDirectoryAdmin-A', 'ActiveDirectoryAdmin-C';
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$ruleResult.Length | Should -Be 9;
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$ruleResult.TargetName | Should -BeIn 'server-A', 'server-B', 'server-D', 'server-E', 'server-G', 'server-H', 'server-I', 'ActiveDirectoryAdmin-A', 'ActiveDirectoryAdmin-C';
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$ruleResult[0].Reason | Should -BeIn 'Path properties.administratorType: Is null or empty.', 'Path properties.login: Is null or empty.', 'Path properties.sid: Is null or empty.';
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$ruleResult[1].Reason | Should -BeIn "A sub-resource of type 'Microsoft.DBforPostgreSQL/servers/administrators' has not been specified.";
@@ -196,17 +196,17 @@ Describe 'Azure.PostgreSQL' -Tag 'PostgreSQL' {
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# Pass
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$ruleResult = @($filteredResult | Where-Object { $_.Outcome -eq 'Pass' });
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$ruleResult | Should -Not -BeNullOrEmpty;
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$ruleResult.Length | Should -Be 2;
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$ruleResult.TargetName | Should -BeIn 'server-F', 'server-G';
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$ruleResult.Length | Should -Be 4;
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$ruleResult.TargetName | Should -BeIn 'server-F', 'server-G', 'server-H', 'server-I';
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}
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It 'Azure.PostgreSQL.MaintenanceWindow' {
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$filteredResult = $result | Where-Object { $_.RuleName -eq 'Azure.PostgreSQL.MaintenanceWindow' };
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# Fail
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$ruleResult = @($filteredResult | Where-Object { $_.Outcome -eq 'Fail' });
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$ruleResult.Length | Should -Be 3;
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$ruleResult.TargetName | Should -BeIn 'server-D', 'server-E', 'server-F';
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$ruleResult.Length | Should -Be 5;
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$ruleResult.TargetName | Should -BeIn 'server-D', 'server-E', 'server-F', 'server-H', 'server-I';
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$ruleResult[0].Reason | Should -BeExactly "Path properties.maintenanceWindow.customWindow: The field 'properties.maintenanceWindow.customWindow' does not exist.";
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$ruleResult[1].Reason | Should -BeExactly "Path properties.maintenanceWindow.customWindow: Is set to 'notset'.";
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$ruleResult.Length | Should -Be 1;
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$ruleResult.TargetName | Should -BeIn 'server-G';
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}
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It 'Azure.PostgreSQL.ZoneRedundantHA' {
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$filteredResult = $result | Where-Object { $_.RuleName -eq 'Azure.PostgreSQL.ZoneRedundantHA' };
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# Fail
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$ruleResult = @($filteredResult | Where-Object { $_.Outcome -eq 'Fail' });
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$ruleResult.Length | Should -Be 4;
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$ruleResult.TargetName | Should -BeIn 'server-D', 'server-E', 'server-F', 'server-G';
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$ruleResult[0].Reason | Should -BeExactly "Path sku.tier: The field value 'Burstable' was not included in the set.";
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$ruleResult[1].Reason | Should -BeExactly "Path properties.highAvailability.mode: Is set to 'Disabled'."
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$ruleResult[2].Reason | Should -BeExactly "Path properties.highAvailability.mode: Is set to 'SameZone'.";
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$ruleResult[3].Reason | Should -BeExactly "Path sku.tier: The field value 'Burstable' was not included in the set.";
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# Pass
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$ruleResult = @($filteredResult | Where-Object { $_.Outcome -eq 'Pass' });
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$ruleResult.Length | Should -Be 2;
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$ruleResult.TargetName | Should -BeIn 'server-H', 'server-I';
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}
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}
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Context 'Resource name - Azure.PostgreSQL.ServerName' {

‎tests/PSRule.Rules.Azure.Tests/Resources.PostgreSQL.json

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{
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"ResourceId": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-D",
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"Id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-D",
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"Location": "region",
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"Location": "westeurope",
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"ResourceName": "server-D",
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"Name": "server-D",
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"Properties": {
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"backupRetentionDays": 35,
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"geoRedundantBackup": "Enabled"
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},
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"highAvailability": {
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"mode": "Disabled"
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},
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"version": "14",
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"createMode": "Default"
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},
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{
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"ResourceId": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-E",
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"Id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-E",
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"Location": "region",
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"Location": "westeurope",
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"ResourceName": "server-E",
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"Name": "server-E",
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"Properties": {
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378375
"startHour": "notset",
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"startMinute": "notset"
380377
},
378+
"availabilityZone": "1",
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"highAvailability": {
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"mode": "Disabled"
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},
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{
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"ResourceId": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-F",
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"Id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-F",
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"Location": "region",
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"Location": "westeurope",
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"ResourceName": "server-F",
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"Name": "server-F",
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"Properties": {
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435433
"startHour": 1,
436434
"startMinute": 0
437435
},
436+
"availabilityZone": "1",
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"highAvailability": {
439-
"mode": "Disabled"
438+
"mode": "SameZone",
439+
"standbyAvailabilityZone": "1"
440440
},
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"version": "14",
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"createMode": "Default"
@@ -469,7 +469,7 @@
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{
470470
"ResourceId": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-G",
471471
"Id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-G",
472-
"Location": "region",
472+
"Location": "westeurope",
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"ResourceName": "server-G",
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"Name": "server-G",
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"Properties": {
@@ -492,8 +492,98 @@
492492
"startHour": 1,
493493
"startMinute": 0
494494
},
495+
"availabilityZone": "1",
495496
"highAvailability": {
496-
"mode": "Disabled"
497+
"mode": "ZoneRedundant",
498+
"standbyAvailabilityZone": "2"
499+
},
500+
"version": "14",
501+
"createMode": "Default"
502+
},
503+
"ResourceGroupName": "test-rg",
504+
"Type": "Microsoft.DBforPostgreSQL/flexibleServers",
505+
"ResourceType": "Microsoft.DBforPostgreSQL/flexibleServers",
506+
"Sku": {
507+
"Name": "Standard_B2s",
508+
"Tier": "Burstable"
509+
},
510+
"Tags": null,
511+
"SubscriptionId": "00000000-0000-0000-0000-000000000000"
512+
},
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{
514+
"ResourceId": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-H",
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"Id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-H",
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"Location": "notregion",
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"ResourceName": "server-H",
518+
"Name": "server-H",
519+
"Properties": {
520+
"administratorLogin": "db-admin",
521+
"authConfig": {
522+
"activeDirectoryAuth": "Enabled",
523+
"passwordAuth": "Disabled",
524+
"tenantId": "00000000-0000-0000-0000-000000000000"
525+
},
526+
"storage": {
527+
"storageSizeGB": 20
528+
},
529+
"backup": {
530+
"backupRetentionDays": 7,
531+
"geoRedundantBackup": "Disabled"
532+
},
533+
"maintenanceWindow": {
534+
"customWindow": "Disabled",
535+
"dayOfWeek": 0,
536+
"startHour": 1,
537+
"startMinute": 0
538+
},
539+
"availabilityZone": "1",
540+
"highAvailability": {
541+
"mode": "ZoneRedundant",
542+
"standbyAvailabilityZone": "2"
543+
},
544+
"version": "14",
545+
"createMode": "Default"
546+
},
547+
"ResourceGroupName": "test-rg",
548+
"Type": "Microsoft.DBforPostgreSQL/flexibleServers",
549+
"ResourceType": "Microsoft.DBforPostgreSQL/flexibleServers",
550+
"Sku": {
551+
"Name": "E64",
552+
"Tier": "MemoryOptimized"
553+
},
554+
"Tags": null,
555+
"SubscriptionId": "00000000-0000-0000-0000-000000000000"
556+
},
557+
{
558+
"ResourceId": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-I",
559+
"Id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.DBforPostgreSQL/flexibleServers/server-I",
560+
"Location": "westeurope",
561+
"ResourceName": "server-I",
562+
"Name": "server-I",
563+
"Properties": {
564+
"administratorLogin": "db-admin",
565+
"authConfig": {
566+
"activeDirectoryAuth": "Enabled",
567+
"passwordAuth": "Disabled",
568+
"tenantId": "00000000-0000-0000-0000-000000000000"
569+
},
570+
"storage": {
571+
"storageSizeGB": 20
572+
},
573+
"backup": {
574+
"backupRetentionDays": 7,
575+
"geoRedundantBackup": "Disabled"
576+
},
577+
"maintenanceWindow": {
578+
"customWindow": "Disabled",
579+
"dayOfWeek": 0,
580+
"startHour": 1,
581+
"startMinute": 0
582+
},
583+
"availabilityZone": "1",
584+
"highAvailability": {
585+
"mode": "ZoneRedundant",
586+
"standbyAvailabilityZone": "2"
497587
},
498588
"version": "14",
499589
"createMode": "Default"

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