An Avi Load Balancer Controller cluster continuously collects CPU, disk, and memory utilization metrics from the cluster nodes. When the usage threshold is exceeded, a system alert is raised to notify the admin.
By default, this threshold has been preconfigured to be 85% for CPU, disk, and memory. In some deployments, this predefined threshold may not be conservative enough, and a lower value is desired. The following will provide an example of modifying these thresholds to meet your deployment’s requirements.
Threshold Configuration Options
Custom thresholds can independently be defined for:
CONTROLLER_CPU_THRESHOLD
CONTROLLER_MEM_THRESHOLD
CONTROLLER_DISK_THRESHOLD
When defining the configuration, there are two threshold options to be aware of:
watermark_thresholds: Threshold value for which event is raised. There can be multiple thresholds defined. Health score degrades when the target is higher than this threshold.
reset_thresholds: The value used to reset the event state machine.
Configure Controller Thresholds
The following configuration provides an example of overwriting the default values. This example will configure a watermark_threshold of 75 and a reset_threshold of 60 for CPU, disk, and memory. With this configuration, if resource utilization of any of these three exceeds 75%, an alert will be raised for that resource. Once utilization drops below 60%, the alert will be reset.
[admin:controller]: > configure systemconfiguration [admin:controller]: systemconfiguration> controller_analytics_policy [admin:controller]: systemconfiguration:controller_analytics_policy> metrics_event_thresholds [admin:controller]: systemconfiguration:controller_analytics_policy> metrics_event_thresholds metrics_event_threshold_type controller_cpu_threshold New object being created [admin:controller]: systemconfiguration:controller_analytics_policy:metrics_event_thresholds> reset_threshold 60 watermark_thresholds 75 [admin:controller]: systemconfiguration:controller_analytics_policy:metrics_event_thresholds> save [admin:controller]: systemconfiguration:controller_analytics_policy> metrics_event_thresholds metrics_event_threshold_type controller_mem_threshold New object being created [admin:controller]: systemconfiguration:controller_analytics_policy:metrics_event_thresholds> reset_threshold 60 watermark_thresholds 75 [admin:controller]: systemconfiguration:controller_analytics_policy:metrics_event_thresholds> save [admin:controller]: systemconfiguration:controller_analytics_policy> metrics_event_thresholds metrics_event_threshold_type controller_disk_threshold New object being created [admin:controller]: systemconfiguration:controller_analytics_policy:metrics_event_thresholds> reset_threshold 60 watermark_thresholds 75 [admin:controller]: systemconfiguration:controller_analytics_policy:metrics_event_thresholds> save [admin:controller]: systemconfiguration:controller_analytics_policy> save [admin:controller]: systemconfiguration> save +----------------------------------+------------------------------------+ | Field | Value | +----------------------------------+------------------------------------+ | controller_analytics_policy | | | metrics_event_thresholds[1] | | | reset_threshold | 60.0 | | watermark_thresholds[1] | 75 | | metrics_event_threshold_type | CONTROLLER_CPU_THRESHOLD | | metrics_event_thresholds[2] | | | reset_threshold | 60.0 | | watermark_thresholds[1] | 75 | | metrics_event_threshold_type | CONTROLLER_MEM_THRESHOLD | | metrics_event_thresholds[3] | | | reset_threshold | 60.0 | | watermark_thresholds[1] | 75 | | metrics_event_threshold_type | CONTROLLER_DISK_THRESHOLD | +----------------------------------+------------------------------------+
