Custom object
A Kubernetes custom object is an API object whose resource type and schema are defined by a custom resource definition or another extension mechanism.
Acing the Certified Kubernetes Administrator Exam, Second Edition
A custom resource is a Kubernetes API resource instance representing domain-specific state defined by a custom resource definition.
- How it is used
- Operates domain-specific state through Kubernetes APIs and lets an operator reconcile application behavior from declarative objects.
- How deep it goes
- Explains the CR-versus-CRD distinction, manifest fields, operator interaction, and kubectl verification, without descending into controller implementation.
- Examples
- Uses a CloudNativePG Cluster object with one instance and 1Gi storage, then checks cluster status, description, and pod readiness.
- What you can do after
- Operate/configure a custom resource with YAML and kubectl, then verify reconciliation through resource status, descriptions, and pods.
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Distributed Machine Learning Patterns
A Kubernetes custom resource is an API object of a user-defined resource type that extends the Kubernetes API.
- How it is used
- Deploys Kubernetes-native abstractions for distributed or nondistributed machine-learning jobs.
- How deep it goes
- Explains registration, kubectl access, and controller processing, but stops short of controller implementation details.
- Examples
- Uses a TFJob definition with two workers, TensorFlow containers, restart behavior, kubectl submission, and resulting worker Pods.
- What you can do after
- Operate/configure custom objects with kubectl and delegate workload reconciliation to a Kubernetes controller.
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Related concepts
- Kubernetes operatorused by · A Kubernetes operator is a controller pattern that extends Kubernetes to automate application or service management by reconciling desired and actual state through the Kubernetes API.
- Kubeflow training operatorused by · The Kubeflow Training Operator is a Kubernetes operator that manages distributed and nondistributed machine learning training jobs through custom resources.
- HTTPRouteincludes · An HTTPRoute is a Kubernetes Gateway API resource defining how HTTP requests are matched and forwarded to backend services through parent gateways.
- Kubernetes APIpart of · The Kubernetes API is the programmatic interface through which clients and components define, query, modify, and manage Kubernetes resources and cluster state.
- custom resource definitionproduced by · A CustomResourceDefinition is a Kubernetes API object that defines a custom resource type and its schema.
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