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

1. PodNamespace
2. Service
3. Namespace
4. ConfigMap
5. Secret
6. Secret
6. PersistentVolume (PV)
7. PersistentVolumeClaim (PVC)
8. ReplicationController
9. ReplicationControllerNode
10. Event
11. NodeEndpoint
12. LimitRange
13. EventResourceQuota
11. Endpoint
12. LimitRange
13. ResourceQuota

Workload-Ressourcen:

• Deployment

1. DeploymentReplicaSet
2. ReplicaSetStatefulSet
3. StatefulSetDaemonSet
4. DaemonSetJob
5. JobCronJob
6. CronJob

Networking-Ressourcen:

• Ingress

1. IngressNetworkPolicy
2. 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