Service Overview
GSLB (Global Server Load Balancing) automatically distributes network traffic to available adjacent regions on a DNS basis when traffic increases in a specific global region. In case of failure on a specific server, it load balances network traffic to available new resources, allowing the service to continue stably.
Features
- Stable Service Provision: Through the function to check whether connected resources are operating normally (Health Check), if a failure occurs on a specific server, it immediately performs a Failover on that resource and removes it from the domain response, thereby bypassing traffic to other resources to provide stable service.
- Easy Service Port Configuration: You can conveniently create GSLB through a web-based console and set/manage service ports. For L4-level load balancing, multi-port configuration is possible (80, 443, 8080-8090, etc.), and multiple load balancing rules can be applied and managed simultaneously.
- Efficient Cost Management: Charges are determined by applying a detailed billing method based on the number of configured domains, the number of added Health Check resources, and the number of queries, allowing efficient cost management.
Service Configuration Diagram
Provided Functions
The GSLB service provides the following functions.
- GSLB Creation/Management: You can register multiple resources to a single GSLB.
- Distribution Algorithm Selection: Provides the Ratio method, which distributes traffic in proportion to the weight (Weight) for each connection target, and the Round Robin method, which distributes traffic evenly while circulating.
- Health Check Configuration: You can set the check cycle (Interval), service down recognition time (Timeout), response wait time (Probe Timeout), protocol (ICMP, TCP, HTTP, HTTPS), and service port.
Constraints
The constraints of the GSLB service are as follows.
| Item | Description |
|---|---|
| Maximum number of domains that can be created per Account | 20 |
| Maximum number of resources that can be connected per domain | 8 |
Table. GSLB Constraints
Note
- For GSLB to monitor connection targets, allow rules must be added to the Firewall and Security Group of the connection target resources.
Regional Availability
The GSLB service can be provided in the following environments.
| Region | Availability |
|---|---|
| Korea West (kr-west1) | Available |
| Korea East (kr-east1) | Available |
| Korea South1 (kr-south1) | Unavailable |
| Korea South2 (kr-south2) | Unavailable |
| Korea South3 (kr-south3) | Unavailable |
Table. GSLB Regional Availability
Prerequisite Services
The GSLB service has no prerequisite services.