Monitoring & Reporting Tools Flashcards
7 cards from real COA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Monitoring & Reporting Tools flashcards as text
What is the significance of 'aggregation methods' in Gnocchi archive policies?
Answer: They specify mathematical functions (mean, max, min, sum) used to aggregate raw data points into each granularity bucket
Aggregation methods in Gnocchi archive policies define the mathematical functions (e.g., mean, max, sum) used to aggregate raw measurements into each time bucket.
Which OpenStack service does Ceilometer's 'compute' pollster inspect to gather CPU and memory metrics from instances?
Answer: Libvirt on the compute node directly
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.
In Aodh, what is a 'composite' alarm used for?
Answer: Combining multiple threshold alarms with AND/OR logical operators
A composite alarm in Aodh combines multiple existing alarms using AND/OR logical expressions to trigger based on complex multi-condition logic.
Which OpenStack CLI command would you use to check if the Ceilometer API service is running correctly?
Answer: All of the above can help verify Ceilometer service status
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.
What is the purpose of the 'ceilometer-agent-notification' service?
Answer: It listens to the OpenStack message bus for notifications and converts them into Ceilometer samples
The ceilometer-agent-notification service subscribes to the OpenStack message bus and transforms notification events from services like Nova and Cinder into Ceilometer samples.
Which OpenStack CLI command lists all Gnocchi resources of a specific resource type (e.g., 'instance')?
Answer: openstack metric resource list --type instance
The 'openstack metric resource list --type instance' command filters Gnocchi resources to show only those of the specified resource type.
When an administrator wants to track disk read/write IOPS per instance over time in OpenStack, which combination of services should they use?
Answer: Ceilometer (to collect disk.read.requests/disk.write.requests) + Gnocchi (to store and query the time-series data)
Ceilometer collects disk I/O meters (disk.read.requests, disk.write.requests) via its compute pollster, and Gnocchi stores and serves the resulting time-series data for querying.