Managing Health Checks

Viewing a Health Check

You can view the health check settings and the health check result of each endpoint.

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 whose health check settings you want to view.
6. In the basic information area, click Configure next to Health Check to view the health check settings.

   In the endpoint list, view the health check result of each endpoint.

Modifying a Health Check

You can modify the health check settings of an endpoint group.

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 whose health check settings you want to modify.
6. In the basic information area, click Configure next to Health Check.
7. Configure parameters as instructed. Table 1 lists parameter details.

   Table 1 Health check parameters that you can modify

   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.

Disabling Health Check

You can disable health check or delete health check settings for an endpoint group.

After health check is disabled, the health of the endpoints in the endpoint group will not be checked and the endpoints are always considered healthy. The global accelerator will still forward requests to the endpoints even if they are unhealthy. As a result, services will become unavailable.

If this happens, ensure that the ports used by the backend servers are normal. Otherwise, you are advised to enable health check.

You can disable health check for an endpoint group.

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 whose health check you want to disable.
6. In the basic information area, click Configure next to Health Check.
7. Disable health check.
8. Click OK.
   

   Disabling health check does not change health check settings. You can enable health check with the same settings when you need the health check later.

Deleting Health Check Settings

You can delete health check settings from an endpoint group.

After health check settings are deleted, the health of the endpoints in the endpoint group will not be checked and the endpoints are always considered healthy. The global accelerator will still forward requests to the endpoints even if they are unhealthy. As a result, services will become unavailable.

If this happens, ensure that the ports used by the backend servers are normal. Otherwise, you are advised not to delete health check settings.

You can delete health check settings from an endpoint group.

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 whose health check settings you want to delete.
6. In the basic information area, click Delete next to Health Check.
7. Click OK.
   

   After health check settings are deleted, the global accelerator will stop checking the health of the endpoints. To check their health again, you need to configure another health check.