Add a host

Notes

To ensure high availability, primary and secondary instances must be deployed on different hosts. Therefore, to create instances in ApsaraDB for MyBase and enable all features of ApsaraDB for MyBase, create a minimum of two hosts in the dedicated cluster.

Procedure

1. Log on to the ApsaraDB for MyBase console.
2. In the upper-left corner of the page, select the region where you want to deploy the dedicated cluster.
   
3. Find the dedicated cluster where you want to create the host, and click Details in the Actions column.
4. In the left-side navigation pane, click Hosts, and then click Add Host.
5. Configure the following parameters.

   Parameter	Description
   Region	The region where you want to deploy the host. The host and the dedicated cluster where the host resides must be deployed in the same region.
   Host Image	The operating system (OS) image of the host. Available OS images vary based on the database engine that you selected when you created the dedicated cluster. If you use MySQL and PostgreSQL, you can select AliLinux as the image. If you use SQL Server, you can select Windows as the image. For more information, see Create a dedicated cluster.
   Dedicated Cluster	The dedicated cluster to which the host belongs.
   Zone	The zone where the host resides. We recommend that you deploy hosts in different zones to improve availability.
   Storage Type	The storage type of the host. You can select Local SSD or Enhanced SSD (ESSD). Note You can change the storage type between different enhanced SSD (ESSD) types. You cannot change the storage type between local SSDs and ESSDs. To change the storage type from Enhanced SSD to ESSD PL2, ensure that the disk space is 465 GB or larger. This is not required when you change the storage type from ESSD PL2 to ESSD. To change the storage type from Enhanced SSD or ESSD PL2 to ESSD PL3, ensure that the disk space is 1,265 GB or larger. This is not required when you change the storage type from ESSD PL3 to ESSD or ESSD PL2.
   Host Instance Type	The specification of the host.
   Network Type	The network type of the host. You can select only VPC.
   VSwitch	The vSwitch to which the host is connected. If no options are available, create a vSwitch as prompted below the drop-down list.
   Duration	The subscription duration of the host. You can select Auto-renewal. If your subscription is not renewed, this operation ensures that the system retains your host resources and renews the host based on the specified subscription duration. For example, if you specify a three-month subscription duration, the system renews the host once every three months.

6. Click Buy Now and complete the payment.

References

• View a host in an RDS ApsaraDB for MyBase
• Replace a host
• Restart a host
• Enable or disable instance allocation on a host

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