Configure monitor parameters to determine the service health

September 14, 2021

Contributed by:

S C

You can configure the following monitoring parameters to mark a service as DOWN based on the monitoring probes.

Retries

Maximum number of probes to send to establish the state of a service for which a monitoring probe fails.

failureRetries

Number of retries that must fail, out of the number specified for the Retries parameter, for a service to be marked as DOWN. For example, if the Retries parameter is set to 10 and the Failure Retries parameter is set to 6, out of the 10 probes sent, at least six probes must fail if the service is to be marked as DOWN.

alertRetries

Number of consecutive probe failures after which the appliance generates an SNMP trap called monProbeFailed.

Setting alertRetries to a value higher than the Retries value

The alertRetries parameter, which specifies the maximum number of consecutive monitoring-probe failures after which the Citrix ADC appliance generates an SNMP trap called monProbeFailed, can now be set to a value higher than the Retries value (which specifies the maximum number of probes to send to establish the state of a service for which a monitoring probe failed). If the alertRetries value is higher than the Retries value, the SNMP trap is not sent until after the service is DOWN.

For example, if you set Retries to 3, alertRetries to 12, and the time interval to 5 seconds, the service is marked DOWN after 15 seconds (35), but no alert is generated. If the monitor probes are still failing after 60 seconds (125), the Citrix ADC appliance generates a monProbeFailed trap. If a probe succeeds at some time between 15 and 60 seconds, the service is marked UP and no alert is generated.

Setting the alertRetries value to a value higher than the Retries value helps in generating only genuine alerts and avoid false positives during scheduled restarts.

To set the alertRetries parameter value to a higher value than the Retries value by using the command line interface

At the command prompt, type:

add lb monitor <monitorName> [-retries <integer>] [-alertRetries <integer>]
<!--NeedCopy-->

Example:

add lb monitor monitor-HTTP-1 HTTP -retries 3 -alertRetries 12

To set the alertRetries parameter value to a higher value than the Retries value by using the GUI

Navigate to Configuration > Traffic Management > Load Balancing > Monitors.
Click Add to add a new monitor or select an existing monitor and click Edit.
In the Retries box, type the value for the Retries parameter.
In the SNMP Alert Retries box, type the value for the alertRetries parameter.

The official version of this content is in English. Some of the Cloud Software Group documentation content is machine translated for your convenience only. Cloud Software Group has no control over machine-translated content, which may contain errors, inaccuracies or unsuitable language. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, suitability, or correctness of any translations made from the English original into any other language, or that your Cloud Software Group product or service conforms to any machine translated content, and any warranty provided under the applicable end user license agreement or terms of service, or any other agreement with Cloud Software Group, that the product or service conforms with any documentation shall not apply to the extent that such documentation has been machine translated. Cloud Software Group will not be held responsible for any damage or issues that may arise from using machine-translated content.

Configure monitor parameters to determine the service health

September 14, 2021

Contributed by:

S C

September 14, 2021

Contributed by:

S C

Configure monitor parameters to determine the service health

Retries

failureRetries

alertRetries

Setting alertRetries to a value higher than the Retries value

To set the alertRetries parameter value to a higher value than the Retries value by using the command line interface

To set the alertRetries parameter value to a higher value than the Retries value by using the GUI

In this article