Muokkaa

Jaa

Configure a workgroup availability group

  • Artikkeli

Applies to: SQL Server on Azure VM

This article explains the steps necessary to create an Active Directory domain-independent cluster with an Always On availability group; this is also known as a workgroup cluster. This article focuses on the steps that are relevant to preparing and configuring the workgroup and availability group, and glosses over steps that are covered in other articles, such as how to create the cluster, or deploy the availability group.

Prerequisites

To configure a workgroup availability group, you need the following:

  • At least two Windows Server 2016 (or higher) virtual machines running SQL Server 2016 (or higher), deployed to the same availability set, or different availability zones, using static IP addresses.
  • A local network with a minimum of 4 free IP addresses on the subnet.
  • An account on each machine in the administrator group that also has sysadmin rights within SQL Server.
  • Open ports: TCP 1433, TCP 5022, TCP 59999.

For reference, the following parameters are used in this article, but can be modified as is necessary:

Name Parameter
Node1 AGNode1 (10.0.0.4)
Node2 AGNode2 (10.0.0.5)
Cluster name AGWGAG (10.0.0.6)
Listener AGListener (10.0.0.7)
DNS suffix ag.wgcluster.example.com
Work group name AGWorkgroup

Set a DNS suffix

In this step, configure the DNS suffix for both servers. For example, ag.wgcluster.example.com. This allows you to use the name of the object you want to connect to as a fully qualified address within your network, such as AGNode1.ag.wgcluster.example.com.

To configure the DNS suffix, follow these steps:

  1. RDP in to your first node and open Server Manager.

  2. Select Local Server and then select the name of your virtual machine under Computer name.

  3. Select Change... under To rename this computer....

  4. Change the name of the workgroup name to be something meaningful, such as AGWORKGROUP:

    Change workgroup name

  5. Select More... to open the DNS Suffix and NetBIOS Computer Name dialog box.

  6. Type the name of your DNS suffix under Primary DNS suffix of this computer, such as ag.wgcluster.example.com and then select OK:

    Screenshot shows the D N S Suffix and NetBIOS Computer Name dialog box where you can enter the value.

  7. Confirm that the Full computer name is now showing the DNS suffix, and then select OK to save your changes:

    Screenshot shows where to see your Full computer name.

  8. Restart the server when you are prompted to do so.

  9. Repeat these steps on any other nodes to be used for the availability group.

Edit a host file

Since there is no active directory, there is no way to authenticate Windows connections. As such, assign trust by editing the host file with a text editor.

To edit the host file, follow these steps:

  1. RDP in to your virtual machine.

  2. Use File Explorer to go to c:\windows\system32\drivers\etc.

  3. Right-click the hosts file and open the file with Notepad (or any other text editor).

  4. At the end of the file, add an entry for each node, the availability group, and the listener in the form of IP Address, DNS Suffix #comment like:

    10.0.0.4 AGNode1.ag.wgcluster.example.com #Availability group node
10.0.0.5 AGNode2.ag.wgcluster.example.com #Availability group node
10.0.0.6 AGWGAG.ag.wgcluster.example.com #Cluster IP
10.0.0.7 AGListener.ag.wgcluster.example.com #Listener IP

    Add entries for the IP address, cluster, and listener to the host file

Set permissions

Since there is no Active Directory to manage permissions, you need to manually allow a non-builtin local administrator account to create the cluster.

To do so, run the following PowerShell cmdlet in an administrative PowerShell session on every node:


new-itemproperty -path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System -Name LocalAccountTokenFilterPolicy -Value 1

Create the failover cluster

In this step, you will create the failover cluster. If you're unfamiliar with these steps, you can follow them from the failover cluster tutorial.

Notable differences between the tutorial and what should be done for a workgroup cluster:

  • Uncheck Storage, and Storage Spaces Direct when running the cluster validation.
  • When adding the nodes to the cluster, add the fully qualified name, such as:
    • AGNode1.ag.wgcluster.example.com
    • AGNode2.ag.wgcluster.example.com
  • Uncheck Add all eligible storage to the cluster.

Once the cluster has been created, assign a static Cluster IP address. To do so, follow these steps:

  1. On one of the nodes, open Failover Cluster Manager, select the cluster, right-click the Name: <ClusterNam> under Cluster Core Resources and then select Properties.

    Launch properties for the cluster name

  2. Select the IP address under IP Addresses and select Edit.

  3. Select Use Static, provide the IP address of the cluster, and then select OK:

    Provide a static IP address for the cluster

  4. Verify that your settings look correct, and then select OK to save them:

    Verify cluster properties

Create a cloud witness

In this step, configure a cloud share witness. If you're unfamiliar with the steps, see Deploy a Cloud Witness for a Failover Cluster.

Enable the availability group feature

In this step, enable the availability group feature. If you're unfamiliar with the steps, see the availability group tutorial.

Create keys and certificates

In this step, create certificates that a SQL login uses on the encrypted endpoint. Create a folder on each node to hold the certificate backups, such as c:\certs.

Note

If you don't specify an expiration date for the certificate, its validity will be one year from the date of creation. If the certificate expires, the connection between endpoints will fail.

To configure the first node, follow these steps:

  1. Open SQL Server Management Studio and connect to your first node, such as AGNode1.

  2. Open a New Query window and run the following Transact-SQL (T-SQL) statement after updating to a complex and secure password:

    USE master;  
CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'PassWOrd123!';  
GO

--create a cert from the master key
USE master;  
CREATE CERTIFICATE AGNode1Cert   
   WITH SUBJECT = 'AGNode1 Certificate';  
GO  

--Backup the cert and transfer it to AGNode2
BACKUP CERTIFICATE AGNode1Cert TO FILE = 'C:\certs\AGNode1Cert.crt';  
GO

  3. Next, create the HADR endpoint, and use the certificate for authentication by running this Transact-SQL (T-SQL) statement:

    --CREATE or ALTER the mirroring endpoint
CREATE ENDPOINT hadr_endpoint  
   STATE = STARTED  
   AS TCP (  
      LISTENER_PORT=5022  
      , LISTENER_IP = ALL  
   )   
   FOR DATABASE_MIRRORING (   
      AUTHENTICATION = CERTIFICATE AGNode1Cert  
      , ENCRYPTION = REQUIRED ALGORITHM AES  
      , ROLE = ALL  
   );  
GO

  4. Use File Explorer to go to the file location where your certificate is, such as c:\certs.

  5. Manually make a copy of the certificate, such as AGNode1Cert.crt, from the first node, and transfer it to the same location on the second node.

To configure the second node, follow these steps:

  1. Connect to the second node with SQL Server Management Studio, such as AGNode2.

  2. In a New Query window, run the following Transact-SQL (T-SQL) statement after updating to a complex and secure password:

    USE master;  
CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'PassWOrd123!';  
GO 

--create a cert from the master key
USE master;  
CREATE CERTIFICATE AGNode2Cert   
   WITH SUBJECT = 'AGNode2 Certificate';  
GO  
--Backup the cert and transfer it to AGNode1
BACKUP CERTIFICATE AGNode2Cert TO FILE = 'C:\certs\AGNode2Cert.crt';  
GO

  3. Next, create the HADR endpoint, and use the certificate for authentication by running this Transact-SQL (T-SQL) statement:

    --CREATE or ALTER the mirroring endpoint
CREATE ENDPOINT hadr_endpoint  
   STATE = STARTED  
   AS TCP (  
      LISTENER_PORT=5022  
      , LISTENER_IP = ALL  
   )   
   FOR DATABASE_MIRRORING (   
      AUTHENTICATION = CERTIFICATE AGNode2Cert  
      , ENCRYPTION = REQUIRED ALGORITHM AES  
      , ROLE = ALL  
   );  
GO

  4. Use File Explorer to go to the file location where your certificate is, such as c:\certs.

  5. Manually make a copy of the certificate, such as AGNode2Cert.crt, from the second node, and transfer it to the same location on the first node.

If there are any other nodes in the cluster, repeat these steps there also, modifying the respective certificate names.

Create logins

Certificate authentication is used to synchronize data across nodes. To allow this, create a login for the other node, create a user for the login, create a certificate for the login to use the backed-up certificate, and then grant connect on the mirroring endpoint.

To do so, first run the following Transact-SQL (T-SQL) query on the first node, such as AGNode1:

--create a login for the AGNode2
USE master;  
CREATE LOGIN AGNode2_Login WITH PASSWORD = 'PassWord123!';  
GO  

--create a user from the login
CREATE USER AGNode2_User FOR LOGIN AGNode2_Login;  
GO  

--create a certificate that the login uses for authentication
CREATE CERTIFICATE AGNode2Cert  
   AUTHORIZATION AGNode2_User  
   FROM FILE = 'C:\certs\AGNode2Cert.crt'  
GO 

--grant connect for login
GRANT CONNECT ON ENDPOINT::hadr_endpoint TO [AGNode2_login];  
GO

Next, run the following Transact-SQL (T-SQL) query on the second node, such as AGNode2:

--create a login for the AGNode1
USE master;  
CREATE LOGIN AGNode1_Login WITH PASSWORD = 'PassWord123!';  
GO  

--create a user from the login
CREATE USER AGNode1_User FOR LOGIN AGNode1_Login;  
GO  

--create a certificate that the login uses for authentication
CREATE CERTIFICATE AGNode1Cert  
   AUTHORIZATION AGNode1_User  
   FROM FILE = 'C:\certs\AGNode1Cert.crt'  
GO 

--grant connect for login
GRANT CONNECT ON ENDPOINT::hadr_endpoint TO [AGNode1_login];  
GO

If there are any other nodes in the cluster, repeat these steps there also, modifying the respective certificate and user names.

Configure an availability group

In this step, configure your availability group, and add your databases to it. Do not create a listener at this time. If you're not familiar with the steps, see the availability group tutorial. Be sure to initiate a failover and failback to verify that everything is working as it should be.

Note

If there is a failure during the synchronization process, you may need to grant NT AUTHORITY\SYSTEM sysadmin rights to create cluster resources on the first node, such as AGNode1 temporarily.

Configure a load balancer

In this final step, configure the load balancer using either the Azure portal or PowerShell.

However, there may be some limitations when using the Windows Cluster GUI, and as such, you should use PowerShell to create a client access point or the network name for your listener with the following example script:

Add-ClusterResource -Name "IPAddress1" -ResourceType "IP Address" -Group "WGAG" 
Get-ClusterResource -Name IPAddress1 | Set-ClusterParameter -Multiple @{"Network" = "Cluster Network 1";"Address" = "10.0.0.4";"SubnetMask" = "255.0.0.0";"EnableDHCP" = 0} 
Add-ClusterResource -Name "IPAddress2" -ResourceType "IP Address" -Group "WGAG" 
Get-ClusterResource -Name IPAddress2 | Set-ClusterParameter -Multiple @{"Network" = "Cluster Network 2";"Address" = "10.0.0.5";"SubnetMask" = "255.0.0.0";"EnableDHCP" = 0} 
Add-ClusterResource -Name "TestName" -Group "WGAG" -ResourceType "Network Name" 
Get-ClusterResource -Name "TestName" | Set-ClusterParameter -Multiple @{"DnsName" = "TestName";"RegisterAllProvidersIP" = 1} 
Set-ClusterResourceDependency -Resource TestName -Dependency "[IPAddress1] or [IPAddress2]" 
Start-ClusterResource -Name TestName -Verbose

Next steps

Once the availability group is deployed, consider optimizing the HADR settings for SQL Server on Azure VMs.

To learn more, see: