added

k8s/pvc

@@ -0,0 +1,93 @@
+Retain static PersistentVolumeClaim
+
+Change Claim to static hostPath volume
+
+cat >~/carpool/postgres/postgres-pv-claim.yaml <<EOF
+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: postgres-pv-claim
+  labels:
+    app: postgres
+spec:
+  storageClassName: ""
+  volumeName: postgres-pv
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi
+EOF
+
+Create static PersistenceVolume
+
+cat >~/carpool/postgres/postgres-pv.yaml <<EOF
+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: postgres-pv 
+spec:
+  accessModes:
+  - ReadWriteOnce
+  capacity:
+    storage: 1Gi
+  claimRef:
+    name: postgres-pv-claim
+    namespace: carpool
+  hostPath:
+    path: /data
+    type: DirectoryOrCreate
+  nodeAffinity:
+    required:
+      nodeSelectorTerms:
+      - matchExpressions:
+        - key: kubernetes.io/hostname
+          operator: In
+          values:
+          - k3d-cnbc-agent-1
+  persistentVolumeReclaimPolicy: Retain
+  storageClassName: ""
+  volumeMode: Filesystem
+EOF
+
+Szenario:
+
+kubectl delete namespace carpool
+kubectl delete pv <...>
+
+kubectl create namespace carpool
+kubectl apply -f postgres
+kubectl apply -f app 
+kubectl run curl -ti --image=curlimages/curl -- /bin/sh
+cd /tmp
+cat >car_1.json <<EOF
+{
+  "license_plate": "BO-PR-72",
+  "car_type": "mini clubman SD",
+  "fuel": "diesel",
+  "number_of_seats": "5"
+}
+EOF
+curl -i -X POST http://carpool:5000/car \
+  -H "Content-Type: application/json" \
+  --data-binary "@car_1.json"
+
+curl http://carpool:5000/car
+exit
+
+# delete again and check retaining of pv
+kubectl delete namespace carpool
+kubectl get pv
+
+# if not edit Postgres pvc and pod pending
+
+kubectl edit pv <...>
+# remove claim-ref uid and resource version
+kubectl create ns carpool
+kubectl apply -f postgres
+kubectl apply -f app 
+kubectl run curl -ti --image=curlimages/curl -- /bin/sh
+curl http://carpool:5000/car
+# data exists
+exit
+