State persistence

Author: michael-grevers

docs/openshift/services-networking/index.md

@@ -127,5 +127,5 @@ spec:
 | Task                            | Description         | Link        |
 | --------------------------------| ------------------  |:----------- |
 | *** Try It Yourself ***                         |         |         | 
-| Creating Services | Create two services with certain requirements. | [Setting up Services](../kube-overview/activities/labs/lab8) |
-| IKS Ingress Controller | Configure Ingress on Free IKS Cluster | [Setting IKS Ingress](../kube-overview/activities/labs/ingress-iks) |
+| Creating Services | Create two services with certain requirements. | [Setting up Services](../../labs/kubernetes/lab8/index.md) |
+| IKS Ingress Controller | Configure Ingress on Free IKS Cluster | [Setting IKS Ingress](../../labs/kubernetes/ingress-iks/index.md) |

docs/openshift/state-persistence/index.md

@@ -1,9 +1,40 @@
 # State Persistence
 
+State persistence in the context of Kubernetes/OpenShift refers to the ability to maintain and retain the state or data of applications even when they are stopped, restarted, or moved between nodes. This is achieved through the use of volumes, persistent volumes (PVs), and persistent volume claims (PVCs). Volumes provide a way to store and access data in a container, while PVs serve as the underlying storage resources provisioned by the cluster. PVCs act as requests made by applications for specific storage resources from the available PVs. By utilizing PVs and PVCs, applications can ensure that their state is preserved and accessible across pod restarts and migrations, enabling reliable and consistent data storage and retrieval throughout the cluster.
+
+## Resources
+
+
+[Volumes :fontawesome-solid-globe:](https://kubernetes.io/docs/concepts/storage/volumes/){ .md-button target="_blank"}
+
+[Persistent Volumes :fontawesome-solid-globe:](https://kubernetes.io/docs/concepts/storage/persistent-volumes/){ .md-button target="_blank"}
+
+[Persistent Volume Claims :fontawesome-solid-globe:](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#persistentvolumeclaims){ .md-button target="_blank"}
+
+## References
+
+```yaml
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: my-pvc
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi
+```
+In this example, we define a PVC named my-pvc with the following specifications:
+
+accessModes specify that the volume can be mounted as read-write by a single node at a time (ReadWriteOnce).
+resources.requests.storage specifies the requested storage size for the PVC (1Gi).
+
+
 ## Activities
 
 | Task                            | Description         | Link        |
 | --------------------------------| ------------------  |:----------- |
 | *** Try It Yourself ***                         |         |    
-| Setting up Persistent Volumes | Create a Persistent Volume that's accessible from a SQL Pod. | [Setting up Persistent Volumes](../labs/kube-overview/activities/labs/lab10/index.md) |
+| Setting up Persistent Volumes | Create a Persistent Volume that's accessible from a SQL Pod. | [Setting up Persistent Volumes](../../labs/kubernetes/lab10/index.md) |