Windows 2019
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SQL Server 2019 : AlwaysOn Availability Groups #12021/01/29
 
Configure AlwaysOn Availability Groups.
This example is based on the environment with 2 SQL Servers like follows.
(possible to configure with more than 3 SQL Servers) 
                                   |
+----------------------+           |           +----------------------+
|  [      AD DS     ]  |10.0.0.100 | 10.0.0.109|  [  iSCSI Target  ]  |
|    fd3s.srv.world    +-----------+-----------+    tgt01.srv.world   |
|                      |           |           |                      |
+----------------------+           |           +----------------------+
                                   |
+----------------------+           |           +----------------------+
|  [ SQL Server #1 ]   |10.0.0.101 | 10.0.0.102|  [ SQL Server #2 ]   |
|    rx-7.srv.world    +-----------+-----------+    rx-8.srv.world    |
|                      |                       |                      |
+----------------------+                       +----------------------+
[1]
Configure Windows Server Failover Clustering (WSFC) on all Nodes you plan to configure AlwaysOn Availability Groups, refer to here.
[2]
Create a domain user account on AD DS for SQL Server, refer to here.
Also add the user in [Domain Admins] group. It creates [SQLAdmin] user on this example.
[3]
Install SQL Server with standalone mode on all Nodes you plan to configure AlwaysOn Availability Groups.
[4] Change settings like following all sections on all Nodes you plan to configure AlwaysOn Availability Groups.
Run [SQL Server 2019 Configuration manager].
[5] Select [SQL Server Services] on the left pane and right click [SQL Server (***)] on the right pane to open [Properties].
[6] Change logon user to the AD user you created on [2]. Next, move to the [Alwayson Availability Groups] tab.
[7] Check a box [Alwayson Availability Groups] and apply settings. After changing, restart SQL Server service.
[8] Add the AD user account you created on [2] to the SQL Server login. Run SQL Server Management Studio (SSMS) and add the user on [Security] - [Logins] like follows.
[9] Create a folder for the database of AlwaysOn Availability Groups on the same Path on all Nodes and also add full control permission to the SQL Server logon user.
It creates [C:\AlwaysonDB] on this example like follows.
[10] Create a folder for the backup of database of AlwaysOn Availability Groups and also add full control permission to the SQL Server logon user.
It creates [C:\AlwaysonDB_BK] on this example like follows.
[11] Create a database of AlwaysOn Availability Groups with specifying the database folder you created on [9].
It's OK to create it only on primary Node.
It creates [AlwaysonDB] database on this example like follows.
[12] Take a backup of the database for AlwaysOn Availability Groups.
Run SQL Server Management Studio (SSMS) and right click the target database to open the menu, then click [Tasks] - [Back Up].
[13] Click [Remove] button on lower-right tp remove default backup folder, next, click [Add] button to specify backup folder path you created on [10].
[14] Input any backup file name and Click [OK].
[15] It's OK if taking backup has been finished successfully.
Next, Proceed to the settings of AlwaysOn Availability Groups #2.
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