A Kubernetes resource, also called a Kubernetes object, is an API-managed representation of a cluster entity and its state. Resources let developers deploy workloads and help administrators understand and troubleshoot cluster behavior. section 3.0 section 3.2.5
A cluster includes more than 60 built-in resource types, with additional types available through custom resource definitions (CRDs). Resource knowledge supports architectural decisions, application deployment, and diagnosis of failures such as an Ingress rule that does not work. section 3.1 section 3.2.5
Common resources divide responsibilities across workloads, configuration, networking, storage, identity, and cluster administration:
- Pods run one or more containers, while Nodes provide the cluster’s compute power. section 3.2.5
- ConfigMaps hold Pod configuration; Secrets hold typed secret data. section 3.2.5
- Namespaces divide clusters between developers or applications, and ResourceQuotas enforce per-namespace limits. section 3.2.5
- PersistentVolumeClaims let applications claim storage supplied by PersistentVolumes. section 3.2.5
Discovering resources and fields
Run `kubectl api-resources` to list resource names, short names, API versions, namespace scope, and kinds. Run `kubectl explain <resource name>` for a resource description and manifest-field guidance; for example, `kubectl explain pod` documents fields such as `apiVersion`, `kind`, and `metadata`. section 3.2.5
Tracing an Ingress
When an Ingress rule behaves unexpectedly, inspect the Ingress, its Service, and its Endpoints or EndpointSlices. These resources together reveal the routing rule, service abstraction, and Pod targets involved. section 3.2.5
kubectl api-resources NAME SHORTNAMES APIVERSION NAMESPACED KIND bindings v1 true Binding componentstatuses cs v1 false ComponentStatus configmaps cm v1 true ConfigMap endpoints ep v1 true Endpoints events ev v1 true Event limitranges limits v1 true LimitRange namespaces ns v1 false Namespace nodes no v1 false Node persistentvolumeclaims pvc v1 true PersistentVolumeClaim persistentvolumes pv v1 false PersistentVolume pods po v1 true Pod podtemplates v1 true PodTemplate replicationcontrollers rc v1 true ReplicationController resourcequotas quota v1 true ResourceQuota secrets v1 true Secret serviceaccounts sa v1 true ServiceAccount services svc v1 true Service
Browse the API-resource listing to compare names, short names, API versions, namespace scope, and kinds. section 3.2.5
