Create cluster

Create cluster

A cluster is an object composed of multiple nodes, and its state is automatically managed by the MemStore service. When a cluster is created or deleted by the user, the service performs the task and simultaneously updates the state of the cluster automatically. A cluster consists of multiple nodes, each serving as either a Primary or a Replica.
There are the following methods to create a new cluster in the MemStore service.

info

• The security group applied to the cluster must allow access to the port specified during cluster creation to enable cluster access.
• t1i instance types may take a few minutes to tens of minutes to transition to Running status after initial creation.
  Additionally, if the CPU credit is insufficient, tasks that put a load on the CPU may not operate properly, so caution is needed.

caution

User authentication is not supported for Redis OSS engine versions 5 or lower.

1. Go to Data Store > MemStore on the KakaoCloud Console.

2. Click the Create cluster button in the Cluster menu.

Create new cluster

Use cluster mode

1. In the configuration options, select Create a new cluster and click the Enable button for Cluster Mode Setting.

2. Enter the necessary information to create the cluster.

   Category	Item	Description
   Cluster Mode Setting		Select whether to enable or disable the cluster mode
   Basic settings	Cluster Name	Name of the cluster
   	Description (optional)	Enter a description for the cluster (up to 100 characters)
   Redis Compatibility Settings	Engine Version	Set the version of the Redis OSS engine to run on the node - 7.2.6, 7.0.15, 6.2.16, 6.2.5
   	Port	Set the port to be used for Redis access - Default port: 6379 - A port within the range of 2000 to 50000 can be specified
   User Authentication		Select whether to use user authentication for MemStore resource access If not used, access is possible with the default account. If used, access is possible with the entered ID and password.
   User account settings	ID	Enter when using user authentication - Format: 1 to 32 characters, lowercase letters, and _ only * Reserved account names cannot be used.
   	Password	- Format: 8 to 16 characters - Cannot use Korean, spaces, or special characters /, ', ", @
   Parameter Group		Select the parameter group that matches the selected engine version and cluster mode
   Shard settings	Number of Shards	Number of shards to be created - Minimum 1 ~ Maximum 12, entered as an integer
   	Number of Nodes per Shard	Number of nodes per shard to be created - Minimum 2 ~ Maximum 5, entered as an integer
   Node type		Select a node type that provides sufficient memory for optimal service performance - For more details, refer to Node type
   Network settings	VPC	Select one of the pre-created user VPCs
   	Subnet	Select a pre-created user Subnet - Multiple selections possible
   	Security Group	Create a new Security Group or select an existing Security Group to apply to the cluster - Multiple selections possible
   Shard placement		Select the Subnet where each node in the shard will be created

Disable cluster mode

1. In the configuration options, select Create a new cluster and click the Disable button in the Cluster Mode Settings on the Create cluster screen.

2. Enter the necessary information to create the cluster.

   Category	Item	Description
   Cluster mode setting		Select whether to enable or disable cluster mode
   Basic settings	Cluster Name	Name of the cluster - The same cluster name cannot be created within the same project
   	Description (optional)	Enter a description for the cluster (up to 100 characters)
   Redis compatibility settings	Engine Version	Set the version of the Redis OSS engine to run on the node - 7.2.6, 7.0.15, 6.2.16, 6.2.5, 5.0.6
   	Port	Set the port to be used for Redis access - Default port: 6379 - A port within the range of 2000 to 50000 can be specified
   User authentication		Select whether to use user authentication for MemStore resource access If not used, access is possible with the default account. If used, access is possible with the entered ID and password.
   User account settings	ID	Enter when using user authentication - Format: 1 to 32 characters, lowercase letters, and _ only * Reserved account names cannot be used.
   	Password	- Format: 8 to 16 characters - Cannot use Korean, spaces, or special characters /, ', ", @
   Parameter group		Select the parameter group that matches the selected engine version and cluster mode
   Number of nodes	Number of Nodes	Number of nodes to be created - When using high availability: Minimum 2 ~ Maximum 6, entered as an integer _ Creates 1 Primary node and 1 to 5 Replica nodes - When not using high availability: 1 ~ 6, entered as an integer _ Creates 1 Primary node and 0 to 5 Replica nodes Example: To create 1 Primary node and 2 Replica nodes, enter 3 in the number of nodes.
   	High Availability	Select whether to use high availability in the event of a node failure - If high availability is enabled, a new node is created and the node count is maintained when a node fails.
   Node type		Select a node type that provides sufficient memory for optimal service performance - For more details, refer to Node type
   Network settings	VPC	Select one of the pre-created user VPCs
   	Subnet	Select a pre-created user Subnet
   	Security Group	Create a new Security Group or select an existing Security Group to apply to the cluster - Multiple selections possible
   Node placement		Select the Subnet where each node will be created based on the selected network settings
   Automatic backup	Automatic backup Option	Select whether to enable automatic backup option. When enabled, a backup is automatically performed once per day - Available only when there are 2 or more nodes
   	Backup Retention Period	Select backup retention period, from a minimum of 1 day to a maximum of 35 days
   	Automatic backup Start Time	Select the start time for automatic backup. The backup will begin within 15 minutes of the selected time.

Restore cluster

info

• Restoration is available only when cluster mode is disabled.
  

caution

• To ensure the stability of the MemStore service, restoration is only possible with the same or higher engine version used during the backup.
• When restoring from an existing MemStore backup, restoration may fail if the cache size of the source backup is greater than 60% of the memory of the target cluster flavor.

Disable cluster mode

1. In the configuration options, select Restore cluster.

2. To restore from an existing backup, select Backup Type > MemStore Backup. To restore from a file stored in Object Storage, select Backup Type > User Backup File and enter the Object Storage path of the backup file.

3. Enter the necessary information to create the cluster.

   Category	Item	Description
   Cluster mode setting		Select whether to enable or disable cluster mode. Currently, restoration is supported only in Disable mode.
   Basic settings	Cluster Name	Name of the cluster - The same cluster name cannot be created within the same project
   	Description (optional)	Enter a description for the cluster (up to 100 characters)
   Redis compatibility settings	Engine Version	Set the version of the Redis OSS engine to run on the node - 7.2.6, 7.0.15, 6.2.16, 6.2.5, 5.0.6
   	Port	Set the port to be used for Redis access - - Default port: 6379 - a desired port within the range of 2000 to 50000 can be specified
   User authentication		Select whether to use user authentication for MemStore resource access If not used, access is possible with the default account. If used, access is possible with the entered ID and password.
   User account settings	ID	Enter when using user authentication - Format: 1 to 32 characters, lowercase letters, and _ only * Reserved account names cannot be used.
   	Password	- Format: 8 to 16 characters - Cannot use Korean, spaces, or special characters /, ', ", @
   Parameter group		Select the parameter group that matches the selected engine version and cluster mode
   Number of nodes	Number of Nodes	Number of nodes to be created - When using high availability: Minimum 2 ~ Maximum 6, entered as an integer _ Creates 1 Primary node and 1 to 5 Replica nodes - When not using high availability: 1 ~ 6, entered as an integer _ Creates 1 Primary node and 0 to 5 Replica nodes Example: To create 1 Primary node and 2 Replica nodes, enter 3 in the number of nodes.
   	High Availability	Select whether to use high availability in the event of a node failure - If high availability is enabled, a new node is created and the node count is maintained when a node fails.
   Node type		Select a node type that provides sufficient memory for optimal service performance - For more details, refer to Node type
   Network settings	VPC	Select one of the pre-created user VPCs
   	Subnet	Select a pre-created user Subnet
   	Security Group	Create a new Security Group or select an existing Security Group to apply to the cluster - Multiple selections possible
   Node placement		Select the Subnet where each node will be created based on the selected network settings
   Automatic backup	Automatic backup Option	Select whether to enable automatic backup option. When enabled, a backup is automatically performed once per day - Available only when there are 2 or more nodes
   	Backup Retention Period	Select backup retention period, from a minimum of 1 day to a maximum of 35 days
   	Automatic backup Start Time	Select the start time for automatic backup. The backup will begin within 15 minutes of the selected time.