Kubelet Manager Test

The Kubelet manager is a component within the Kubelet responsible for managing pod life cycle operations on a node. It handles pod creation, updates, and deletions, ensuring containers run as specified by Kubernetes. It monitors container health, manages resource allocation, and communicates status back to the Kubernetes API server, maintaining node and pod consistency.

Monitoring the Kubelet manager is vital because it oversees critical pod life cycle operations and resource management on each Kubernetes node. If the Kubelet manager encounters issues, it can lead to failures in pod scheduling, updates, or health checks, resulting in application downtime or degraded performance. By tracking its health and performance, you can detect and resolve problems like resource exhaustion, configuration errors, or communication failures early. This ensures nodes remain functional and responsive, maintaining overall cluster stability and reliability. Effective monitoring helps preemptively address issues, ensuring continuous and optimal operation of containerized applications.

The Kubelet Manager Test continuously monitors the Kubelet Manager in the target node and reports key metrics like operations duration, total volumes in volume manager etc. These metrics are invaluable for the administrators to ensure that service is up and prevent any issues in case service has problems.

Target of the test : A Kubernetes Worker Node

Agent deploying the test : A remote agent

Outputs of the test : One set of results for the target Kubernetes Worker node being monitored

Configurable parameters for the test
Parameter	Description
Test Period	How often should the test be executed.
Host	The IP address of the host for which this test is to be configured.
Port	Specify the port at which the specified Host listens. By default, this is 6443.
Timeout	Specify the duration (in seconds) beyond which the test will timeout in the Timeout text box. The default value is 10 seconds.
Metric URL	Each of the Kubernetes system components expose monitoring metrics through /metrics endpoint of the HTTP server. For components that don't expose endpoint by default, refer official Kubernetes distribution documentation site. Specify the metric URL textbox.

Measurements made by the test
Measurement	Description	Measurement Unit
Total CGroup manager operations duration	Indicates the duration of manager operations associated with CGroup.	Seconds
Number of CGroup manager operation	Indicates the total number of manager operations associated to CGroup.	Number
Total volumes in Volume Manager	Indicates the total volume in volume manager.	Number
Average CGroup manager operations duration	Indicates the average duration of operations associated to CGroup.	Seconds