Read Replica Setup

The user can enter the required information for a Read Replica through the Samsung Cloud Platform Console and create the service using detailed options.

Replica Configure

Through the Replica configuration, you can create replica servers for read-only or disaster recovery purposes. You can create up to 5 Replicas per Database.

To configure a replica, follow these steps.

1. All Services > Database > PostgreSQL(DBaaS) Click the menu. Navigate to the Service Home page of PostgreSQL(DBaaS).
2. Click the PostgreSQL(DBaaS) menu on the Service Home page. Go to the PostgreSQL(DBaaS) List page.
3. PostgreSQL(DBaaS) List Click the resource to configure the replica on the page. PostgreSQL(DBaaS) Detail Navigate to the page.
4. Click the Replica configuration button. Navigate to the Replica configuration page.
5. Replica configuration After entering information in the area, click the Complete button.

   Category	Required	Detailed description
   Region	Required	Region to configure Replica Replica configuration (Other Region) displayed only when selected
   Number of Replicas	Required	Number of Replicas to configure Up to 5 can be configured per cluster If selecting more than 2 values, additionally input Replica name and service type information
   Replica name	Required	Replica server name Start with a lowercase English letter, and use lowercase letters, numbers, and the special character (-) to input 3 to 19 characters The entered Replica name is displayed as the cluster name in the list
   Service Type > Server Type	Required	Replica Server Type Standard: Standard specifications commonly used High Capacity: Large-capacity server with 24 vCore or more
   Service Type > Planned Compute	Optional	Status of resources with Planned Compute set In Use: Number of resources with Planned Compute that are currently in use Configured: Number of resources with Planned Compute set Coverage Preview: Amount applied per resource by Planned Compute Create Planned Compute Service: Go to the Planned Compute service application page For details, refer to Apply for Planned Compute
   IP Access Control	Select	Service Access Policy Settings Since the access policy is set for the IP entered on the page, a separate Security Group policy setting is not required Enter in IP format (e.g., 192.168.10.1) or CIDR format (e.g., 192.168.10.0/24, 192.168.10.1/32) and click the Add button To delete an entered IP, click the x button next to the entered IP
   Maintenance Period	Select	DB Maintenance Period If Use is selected, set the day of the week, start time, and duration. It is recommended to set a maintenance period for stable DB management. Patch work will be performed at the set time, causing service interruption. If set to not use, we are not responsible for issues arising from patches not being applied.
   Tag	Select	Add Tag Add Tag button click then input or select Key, Value values

   Table. PostgreSQL(DBaaS) Replica configuration items

Replica Reconstruct

If a network failure or replication delay with the Master Cluster occurs, you can re-replicate the Master Cluster’s data using the Replica reconstruction function.

To reconstruct the Replica, follow these steps.

1. All Services > Database > PostgreSQL(DBaaS) Click the menu. Go to the Service Home page of PostgreSQL(DBaaS).
2. Service Home page, click the PostgreSQL(DBaaS) menu. Move to the PostgreSQL(DBaaS) list page.
3. PostgreSQL(DBaaS) list page, click the resource to reconfigure the Replica. PostgreSQL(DBaaS) details page will be opened.
4. Replica reconstruction Click the button. Replica reconstruction notification A popup window opens.
5. Replica Reconstruction Notification in the popup window click the Confirm button.

Promote Replica Cluster to Master Cluster

You can promote a Replica Cluster that has completed configuration to a Master Cluster.

To promote a Replica Cluster to Master, follow these steps.

1. All Services > Database > PostgreSQL(DBaaS) Click the menu. Navigate to the Service Home page of PostgreSQL(DBaaS).
2. Click the PostgreSQL(DBaaS) menu on the Service Home page. Navigate to the PostgreSQL(DBaaS) List page.
3. Click the resource to promote to Master on the PostgreSQL(DBaaS) List page. You will be taken to the PostgreSQL(DBaaS) Details page.
4. Click the More button and click the Master promotion button. The Master promotion notification popup window opens.
5. Master Promotion Notification in the popup window click the Confirm button.