HaCluster uses the method of polling your backend servers by attempting to request a statistics report from the proxy service at a set interval.
If HaCluster receives no response, it determines that the server is not healthy and after a certain number of failed connections, it removes the server from the farm.
The method of requesting a report to the proxy service is the default method but there is a more refined health check method using the HaCluster client service.
Whether you use the HaCluster client or the traditional method, you can adjust some parameters :
- The Health checks parameters can be displayed using the left menu “HaCluster / Status / Parameters tab”
- Go to the Health Checks section.
- Check Interval: The Check Interval parameter modifies the interval between checks;
It is 10 seconds by default.
- Fall: The fall parameter defines the number of failed checks allowed.
The default is 5 attempts.
- Rise: The rise parameter defines the number of successful checks before putting a failed backend back into the rotation;
it defaults to two attempts.