Monitoring for Abnormality on a Load Distribution Target

Set the conditions for performing a health check on the virtual server targeted for load distribution.

Setting Health Check Conditions for Virtual Servers Targeted for Load Distribution

Configure the following settings as the conditions for checking whether a virtual server targeted for load distribution responds normally.

Table 1. List of Health Check Condition Settings
Item	Description	Required
Method	Select the method for monitoring the virtual server targeted for load distribution. Use the following format: "protcol:port[url]" protocol: Specify one of TCP, HTTP, HTTPS, and SSL port: Specify a port from 1 to 65535 url: Specify the URL path (optional)	Yes
Interval (seconds)	Specify the interval for performing health checks, in seconds (1 - 2,147,483,647).	Yes
Timeout (seconds)	Specify the time to wait for a response to a health check before a timeout occurs, in seconds (1 - 2,147,483,647). Important: Specify a value that is lower than the value for [Interval (seconds)].	Yes
Consecutive Detection of Abnormality Threshold (number of times)	Specify the number of consecutive health check failures that constitute occurrence of a failure on a target virtual server, and thus warrants exclusion of the virtual server as a target for load distribution (1 - 2,147,483,647).	Yes
Consecutive Detection of Normality Threshold (number of times)	Specify the number of consecutive health check successes that constitute the recovery of a target virtual server and thus warrants inclusion of the virtual server as a target for load distribution (1 - 2,147,483,647).	Yes

Tip: The health monitor function of load distribution performs health checks at the specified interval. If a request returns an error even before a failure is determined using a health check, the request will be resent to another virtual server that is the target of load balancing.