COA Monitoring & Reporting Tools 5

Question 1

What is the significance of 'aggregation methods' in Gnocchi archive policies?

Accepted Answer

They specify mathematical functions (mean, max, min, sum) used to aggregate raw data points into each granularity bucket

Answer

Aggregation methods in Gnocchi archive policies define the mathematical functions (e.g., mean, max, sum) used to aggregate raw measurements into each time bucket.

Question 2

Which OpenStack service does Ceilometer's 'compute' pollster inspect to gather CPU and memory metrics from instances?

Accepted Answer

Libvirt on the compute node directly

Answer

The Ceilometer compute pollster inspects the libvirt API on compute nodes directly to collect fine-grained CPU, memory, and disk I/O metrics from running instances.

Question 3

In Aodh, what is a 'composite' alarm used for?

Accepted Answer

Combining multiple threshold alarms with AND/OR logical operators

Answer

A composite alarm in Aodh combines multiple existing alarms using AND/OR logical expressions to trigger based on complex multi-condition logic.

Question 4

Which OpenStack CLI command would you use to check if the Ceilometer API service is running correctly?

Accepted Answer

All of the above can help verify Ceilometer service status

Answer

All three commands help verify Ceilometer: 'service list' checks registration, 'endpoint list' verifies endpoints, and 'catalog show' displays the full endpoint catalog for the metering service.

Question 5

What is the purpose of the 'ceilometer-agent-notification' service?

Accepted Answer

It listens to the OpenStack message bus for notifications and converts them into Ceilometer samples

Answer

The ceilometer-agent-notification service subscribes to the OpenStack message bus and transforms notification events from services like Nova and Cinder into Ceilometer samples.

(COA) Certified OpenStack Administrator Exam Practice Test

(COA) Certified OpenStack Administrator Exam Practice Test

COA Monitoring & Reporting Tools 5