Create and manage high availability groups

A High Availability Group is a feature that guarantees high availability by grouping load balancer nodes with the same configuration created in different availability zones into a single group.

By configuring a group of load balancer nodes that meet the High Availability Group requirements, this feature ensures that the overall load balancer service can continue to operate normally even if a failure occurs in a specific availability zone.

Create high availability group

The following describes how to create a high availability group.

1. Go to KakaoCloud console > Networking > Load Balancing > High availability group.
2. Click the [Create high availability group] button at the top right.
3. In Type, select the type and scheme of the load balancer to connect to the high availability group, then select the VPC where the high availability group will be created and connect the load balancer nodes with the selected type and scheme in each availability zone within that VPC.
4. After selecting and entering all settings, click the [Create] button. The load balancer nodes connected to the created high availability group can be changed after creation. However, even when changing them, the type and scheme specified at the time of initial creation must be maintained.

View high availability group list and basic information

1. Go to KakaoCloud console > Networking > Load Balancing > High availability group.
2. Check the list of high availability groups.

   Category	Description
   Name	Name entered when created
   ID	ID assigned when created
   DNS name	DNS name created based on the name assigned at creation. A high availability group with the Internet-facing scheme can communicate through this DNS name
   Scheme	Setting for whether a public IP is connected - Internal: Has a private IP and processes traffic inside the VPC - Internet-facing: Has a public IP connected and can communicate through the internet
   Provisioning status	Information indicating whether the high availability group was created successfully or whether modification or deletion is in progress
   Operating status	Information indicating whether the created high availability group is available for use
   Type	Application, Network, or Direct Server Return
   VPC	VPC specified when the high availability group was created
   Availability zone	Displays the number of availability zones currently in use by this high availability group, which means the number of load balancer nodes connected to the high availability group - Can be set to a minimum of one, but two or more must be configured to guarantee high availability
   Created at	Date and time when the high availability group was created

View high availability group details

1. Go to KakaoCloud console > Networking > Load Balancing > High availability group.

2. Select the high availability group whose details you want to view.

3. On each tab, you can check detailed information and network mapping information.

   Details

   Item	Description
   Name	User-defined name used to identify the load balancer
   ID	Load balancer ID
   Provisioning status	Progress status of load balancer resource creation or change operations
   Operating status	Current service operating status of the load balancer
   Load balancer type	Type of the load balancer
   Scheme	Network exposure method of the load balancer (for example, internal/external)
   DNS name	Domain name used by clients to access the load balancer
   Availability zone	List of availability zones where the load balancer is deployed
   Number of LB nodes	Number of nodes that make up the load balancer
   Created at	Date and time when the load balancer was created

   Network

   Item	Description
   VPC name	Name of the VPC to which the load balancer belongs
   VPC ID	Unique ID of the VPC to which the load balancer belongs
   IP CIDR block	IP address range of the VPC connected to the load balancer
   Availability zone	Availability zone where each load balancer node is deployed
   Subnet name	Name of the subnet connected to the load balancer node
   Subnet ID	Unique ID of the subnet connected to the load balancer node
   LB node name	Name of the load balancer node created in each availability zone
   LB node ID	Unique identifier of the load balancer node

Change high availability group description

1. Go to KakaoCloud console > Networking > Load Balancing > High availability group.
2. Select [⋮] > Change description for the high availability group whose description you want to change.
3. Change the description in the pop-up window, and then click the [Apply] button.

Modify subnet and connected LB nodes

1. Go to KakaoCloud console > Networking > Load Balancing > High availability group.
2. In the High availability group list, select [⋮] > Modify subnet and connected LB nodes for the target high availability group.
3. Configure the connection targets in the pop-up window, and then click the [Modify] button.

   Item	Description
   Availability zone	One can be configured for each availability zone
   Subnet	Displays the list of subnets created in the selected availability zone of the specified VPC
   LB node	Displays the list of load balancer nodes created in the selected subnet that match the same scheme and type specified when creating the high availability group

info

• The minimum number of connected load balancer nodes that can be configured is one, but high availability is guaranteed only when two or more are connected.
• If the detailed settings of each selected load balancer node across multiple availability zones are not identical, the service may not operate normally. Make sure each detailed setting is configured the same.
• The number of availability zones supported in the kr-central-2 region is three.

Delete high availability group

1. Go to KakaoCloud console > Networking > Load Balancing > High availability group.
2. Click [⋮] > Delete for the high availability group you want to delete.
3. Enter the required information in the pop-up window, and then click the [Delete] button.