ApsaraDB MyBase:Create a dedicated cluster

Precautions

• In the Thailand (Bangkok) region, you can create dedicated clusters that run only the SQL Server engine.
• When you create a dedicated cluster, the overcommit metrics are set to the default values and cannot be modified. You can modify the overcommit metrics after you create a dedicated cluster. For more information, see Configure resource overcommitment to reduce costs. By default, the following overcommit metrics are configured:
  • CPU Overcommit Ratio for MySQL and SQL Server: 200%
  • Storage Overcommit Ratio for MySQL and SQL Server: 100%
  • Maximum Memory Usage for MySQL and SQL Server: 100%

Procedure

1. Log on to the ApsaraDB MyBase console.
2. In the upper-left corner of the page, select a region.
3. On the Clusters page, click Create Dedicated Cluster.
4. In the Create Dedicated Cluster panel, configure the parameters described in the following table.

   Parameter	Description
   Engine	The database engine of the dedicated cluster. The MySQL and SQL Server engines are supported. Important You must select a database engine, so that you can select the corresponding operating system (OS) image when you create a host and select the corresponding database engine when you create an instance. After you create a dedicated cluster, you cannot change the database engine. Make sure that you select an appropriate database engine.
   Architecture	The edition of the dedicated cluster. This parameter is available only when you set Database Engine to MySQL. This parameter is automatically set to High-availability Edition.
   Dedicated Cluster Name	The name of the dedicated cluster.
   VPC	The virtual private cloud (VPC) in which you want to create the dedicated cluster. If you need to create a VPC, log on to the VPC console. Important After a dedicated cluster is created, you cannot change the VPC. Make sure that you select an appropriate VPC.
   Resource Allocation Policy	The default policy that is used to allocate resources in the dedicated cluster. Valid values: Balanced Allocation: The system preferentially creates database instances on the hosts where no resources or fewer resources are allocated. This maximizes system stability. Compact Allocation: The system preferentially creates database instances on the hosts that are created earlier and have more allocated resources. This maximizes resource utilization.
   Host Troubleshooting Policy	The policy that is used to handle host failures. Valid values: Automatic Host Replacement: The system automatically replaces the faulty hosts. Note If a faulty host uses enhanced SSDs (ESSDs), the host is automatically replaced after the computing resources on the ESSDs are migrated to another host. If a faulty host uses local SSDs, the host is replaced only after all instances are removed from the host. Manual Host Replacement: You must manually replace the faulty hosts. Note This parameter is available only when you set Database Engine to MySQL. For other database engines, faulty hosts are automatically replaced.
   Grant OS Permissions	Specifies whether to grant the host operating system (OS) permissions. Note If the host OS permissions are granted on a dedicated cluster that runs the MySQL or SQL Server database engine, you can log on to the hosts in the dedicated cluster to perform operations such as upload, download, and installation of software. After you create a dedicated cluster, you cannot change the setting of Grant OS Permissions. Proceed with caution.

5. (Optional) The first time you create an ApsaraDB MyBase dedicated cluster, the following message appears in the lower part of the panel. You must grant permissions on elastic network interfaces (ENIs) and security groups of Elastic Compute Service (ECS). Click Authorize Now. On the Cloud Resource Access Authorization page, click Confirm Authorization Policy.
   

   Note After you grant permissions, the AliyunRDSDedicatedHostGroupRole role is displayed on the Roles page of the Resource Access Management (RAM) console. If you want to use ApsaraDB MyBase dedicated clusters, retain this role. If this role is deleted, you must grant the permissions again to create a dedicated cluster.
6. Click OK.

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