Kubernetes Resources

In Kubernetes, resources are like Lego blocks that represent objects you use to build and manage your cluster. Each resource is an object with metadata (like names and labels) and a desired state that tells Kubernetes what to do and stored the in etcd store. For example, a Pod resource defines how to run a group of containers, while a Service resource manages network access to those containers. Everything you can manage with kubectl or the Kubernetes API - like workloads, storage, or configuration - is a resource, making them essential for defining and controlling your cluster's behavior.

The following command will print out all relevant resources kubectl api-resources

The most relevant resources for the KCNA exam are marked red

Core-Ressourcen:

Pod
Namespace
Service
Namespace
ConfigMap
Secret
PersistentVolume (PV)
PersistentVolumeClaim (PVC)
ReplicationController
Node
Event
Endpoint
LimitRange
ResourceQuota

Workload-Ressourcen:

Deployment
ReplicaSet
StatefulSet
DaemonSet
Job
CronJob

Networking-Ressourcen:

Ingress
NetworkPolicy

Storage-Ressourcen:

StorageClass
Volume
VolumeAttachment

Policy-Ressourcen:

PodDisruptionBudget (PDB)
PodSecurityPolicy (PSP)
NetworkPolicy

Custom Resource Definitions (CRDs):

CustomResourceDefinition
APIService

Cluster-spezifische Ressourcen:

ClusterRole
ClusterRoleBinding
Role
RoleBinding
PriorityClass

Autoscaling-Ressourcen:

HorizontalPodAutoscaler (HPA)
VerticalPodAutoscaler (VPA)
ClusterAutoscaler (extern, aber häufig verwendet)

Monitoring- und Debugging-Ressourcen:

Probe (Liveness, Readiness, Startup)
Metrics (via Metrics Server)
AuditPolicy