Configure Read Replica

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

Configure Replica

Through 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 > MariaDB (DBaaS) Click the menu. 1. Go to the Service Home page of MariaDB (DBaaS).
2. On the Service Home page, click the MariaDB(DBaaS) menu. 2. MariaDB (DBaaS) List page is accessed.
3. On the MariaDB (DBaaS) List page, click the resource to configure a Replica. 3. MariaDB(DBaaS) Details Go to the page.
4. Click the Replica configuration button. 4. Replica configuration Navigate to the page.
5. After entering information in the Replica configuration area, click the Complete button.

   Category	required status	Detailed description
   Region	Required	Region to configure the Replica Replica configuration (Other Region) is displayed only when selected
   Replica count	Required	Number of Replicas to configure Up to 5 can be configured per cluster If you select more than one value, additionally enter the Replica name and service type information
   Replica name	Required	Replica server name must start with a lowercase English letter, and use lowercase letters, numbers, and special characters (-) to enter 3 to 19 characters The entered Replica name is displayed as the cluster name in the list
   Service Type > Server Type	Essential	Replica server type Standard: standard specification commonly used High Capacity: large-capacity server with 24vCore or more (to be provided later)
   Service Type > Planned Compute	Select	Status of resources with Planned Compute configured In Use: Number of resources with Planned Compute configured that are currently in use Configured: Number of resources with Planned Compute configured Coverage Preview: Amount applied per resource by Planned Compute Create Planned Compute Service: Navigate to the Planned Compute service application page For more details, see Planned Compute 신청하기
   Service Type > Block Storage	Required	Block Storage configuration using Replica DB Basic OS: Area where the DB engine is installed DATA: Storage area for table data, archive files, etc. Applied identically with the storage type set in the source cluster Capacity cannot be set Additional: DATA, Archive, TEMP, Backup data storage area Applied identically with the storage type set in the source cluster In a Replica, only DATA and TEMP can be added After selecting Use, input the storage purpose and capacity To add storage, click the Add button, and to delete, click the x button Capacity can be entered in multiples of 8 within the range 16–5,120, and up to a maximum of 9 can be created, including the number set in the source cluster
   IP access control	Selection	Service Access Policy Configuration Since the access policy is set for the IP entered on the page, a separate Security Group policy configuration is not required Enter in IP format (example: 192.168.10.1) or CIDR format (example: 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	Database maintenance window If you select Use, set the day of week, start time, and duration It is recommended to set a maintenance window for stable management of the DB. Patch operations will be performed at the scheduled time, causing service interruptions If set to unused, we are not responsible for issues arising from patches not being applied.
   tag	Select	Add Tag after clicking the Add Tag button, Key, Value enter or select

   Table. MariaDB (DBaaS) Replica configuration items

Reconfigure Replica

If a network outage or replication delay with the Master Cluster occurs, you can use the Replica reconstruction function to replicate the Master Cluster’s data again.

To reconfigure the Replica, follow these steps.

1. Click the All Services > Database > MariaDB(DBaaS) menu. 1. Go to the Service Home page of MariaDB (DBaaS).
2. On the Service Home page, click the MariaDB(DBaaS) menu. 2. Navigate to the MariaDB(DBaaS) List page.
3. On the MariaDB(DBaaS) List page, click the resource to reconfigure the Replica. 3. MariaDB(DBaaS) Details Go to the page.
4. Click the Replica Reconstruction button. 4. Replica Reconfiguration Notice A popup window opens.
5. Replica Reconfiguration Notification In the popup window, click the OK button.

Promote Replica Cluster to Master Cluster

You can promote a fully configured Replica Cluster to a Master Cluster.

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

1. All Services > Database > MariaDB(DBaaS) Click the menu. 1. Navigate to the Service Home page of MariaDB (DBaaS).
2. On the Service Home page, click the MariaDB(DBaaS) menu. 2. Navigate to the MariaDB(DBaaS) List page.
3. On the MariaDB(DBaaS) List page, click the resource to promote to Master. 3. MariaDB(DBaaS) Details Go to the page.
4. Click the More button and then click the Master Promotion button. 4. Master Promotion Notification The popup window opens.
5. Master Promotion Notification in the popup window, click the Confirm button.