Kubernetes API

As explained in Cloud Observability in Action

The Kubernetes API is the programmatic interface for querying and changing the state of Kubernetes resources.

The Kubernetes API is the programmatic interface for querying and changing Kubernetes resource state. The control plane manages workloads, namespaces, nodes, and other resources through it. section 3.2.3

From an observability perspective, the API exposes signals but does not provide a complete telemetry pipeline. Teams must collect, route, store, and query those signals separately. section 3.2.3

Operationally, the API connects several concerns:

• Control-plane system logs include API-server logs, alongside kubelet and container-runtime logs. section 3.2.3
• The metrics endpoint can be queried with kubectl to inspect API-server behavior such as admission-controller latency. section 3.2.3
• Low-level integrations, including load balancers and networked storage, may vary across cloud providers despite portable workloads. section 3.2.3

Inspecting API-server metrics

Run `kubectl get --raw /metrics` and filter for `apiserver` to examine metrics such as admission-controller duration histograms. section 3.2.3

Figure 3.2 Signal sources in Kubernetes

Use the signal-source overview to distinguish control-plane and data-plane telemetry around the Kubernetes API. section 3.2.3

How Cloud Observability in Action covers it

How deep it goes

Defines resource-state management and signal sources, then demonstrates raw metrics, but defers comprehensive telemetry collection and processing.

Examples

Demonstrates kubectl raw metrics, API-server admission latency, and control-plane system logs.

What you can do after

Diagnose API-server behavior by querying exposed metrics and relating them to control-plane observability signals.

How it connects

Connects the control plane, data plane, Kubernetes resources, observability, logs, metrics, and cloud-provider infrastructure APIs.

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Also explained in

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  Kubernetes in Action, Second EditionThe Kubernetes API is the programmatic interface through which clients and applications query and modify Kubernetes resources and cluster state.
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  Acing the Certified Kubernetes Administrator Exam, Second EditionThe Kubernetes API is the interface through which Kubernetes resources and cluster operations are represented and accessed.
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  Platform Engineering on KubernetesThe Kubernetes API is the programmatic interface through which Kubernetes resources and cluster behavior are defined and managed.
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  Learn Docker in a Month of Lunches, Second EditionThe Kubernetes API is the standardized interface for declaring, querying, and managing Kubernetes resources and application models.
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  Effective Platform EngineeringThe Kubernetes API is the interface through which clients and components manage Kubernetes resources and cluster state.

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Related concepts

• kubectlused by · kubectl is the Kubernetes command-line client for communicating with the Kubernetes API and managing cluster resources.
• Kubernetespart of · Kubernetes is an open-source platform for orchestrating and automating the deployment, scaling, and management of containerized workloads across computing clusters.
• Kubernetes manifestused by · A Kubernetes manifest is a declarative configuration document, typically written in YAML or JSON, that specifies Kubernetes resources and their desired state.
• cloud computingused by · Cloud computing is the on-demand delivery of computing resources and services over a network from remotely managed infrastructure.
• Helmused by · Helm is a Kubernetes package manager and templating tool that defines, packages, installs, upgrades, and manages applications through charts.
• custom objecthas part · A Kubernetes custom object is an API object whose resource type and schema are defined by a custom resource definition or another extension mechanism.

This explainer was generated by Manning's knowledge graph from the text of Cloud Observability in Action. The section links point to the parts of the book it draws on.