Configuring a Health Check

Scenarios

You can configure a health check to detect unhealthy endpoints and ensure service reliability and availability.

Constraints

• For UDP listeners, ensure that the security group rules configured for each endpoint allow ICMP traffic over the health check port.
• Ensure that the security group rules configured for each endpoint allow traffic from given CIDR blocks over the health check port.

  For details, see Table 1.

  Table 1 CIDR blocks that need to be allowed

  Endpoint Type	Endpoint Group Region	CIDR Blocks to Be Allowed
  EIP Custom EIP	N/A	122.9.234.0/23 116.196.216.0/23 124.71.242.0/23
  ECS ELB IP address Custom domain name	EU-Dublin	101.46.32.0/25 101.46.33.0/25

Procedure

1. Log in to the Global Accelerator console.
2. Search for the global accelerator by name or ID.
3. Click the name of the global accelerator to go to the details page.
4. Click Endpoint Groups.
5. Click the name of the endpoint group.
6. In the basic information area, click Configure next to Health Check.
7. Configure parameters as instructed. For details, see Table 2.

   Table 2 Parameters required for configuring a health check

   Parameter	Description
   Health Check	Whether to enable health check. If you disable health check, requests may be forwarded to unhealthy endpoints.
   Protocol	The value can be TCP or UDP. Default value: TCP
   Port	The port used for health check. Value range: 1 to 65535
   Advanced Settings
   Interval (s)	The maximum time between two consecutive health checks, in seconds. Value range: 1 to 60
   Timeout (s)	The maximum time required for waiting for a response to a health check request, in seconds. Value range: 1 to 60
   Maximum Retries	The maximum number of health check retries allowed. Value range: 1 to 10

8. Click OK.