10-CI-olive-pvc-cka10-str

Cluster 1, Storage, olive-pvc-cka10-str

For this question, please set the context to cluster1 by running:

kubectl config use-context cluster1

We want to deploy a python based application on the cluster using a template located at /root/olive-app-cka10-str.yaml on student-node. However, before you proceed we need to make some modifications to the YAML file as per details given below:

• The YAML should also contain a persistent volume claim with name olive-pvc-cka10-str to claim a 100Mi of storage from olive-pv-cka10-str PV.
• Update the deployment to add a sidecar container, which can use busybox image (you might need to add a sleep command for this container to keep it running.)
• Share the python-data volume with this container and mount the same at path /usr/src. Make sure this container only has read permissions on this volume.
• Finally, create a pod using this YAML and make sure the POD is in Running state.

Missing from the question, but required to pass

• Create a nodeport service for this deployment with the following specification
  • Node port: 32006
  • Name: olive-svc-cka10-str

---

Solution

1. Examine what we have…

   cat /root/olive-app-cka10-str
   

   The PVC volume claim is already present. Look for the PVC

   kubectl get pvc
   

   It is not present, therefore it will have to be created first.

   kubectl get pv
   

   The PV exists. Note the ACCESS MODES and STORAGECLASS, which are required in the PVC manifest, along with the storage request given in the question.

2. Prepare manfiest for the new PVC

   apiVersion: v1
   kind: PersistentVolumeClaim
   metadata:
     name: olive-pvc-cka10-str
   spec:
     accessModes:
     - ReadWriteMany
     resources:
       requests:
         storage: 100Mi
     storageClassName: olive-stc-cka10-str

   Then create it. It will not bind yet until the pod is created.

3. Adjust the pod as directed, and add the service to the end.

   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: olive-app-cka10-str
   spec:
     replicas: 1
     template:
       metadata:
         labels:
           app: olive-app-cka10-str
       spec:
         affinity:
           nodeAffinity:
             requiredDuringSchedulingIgnoredDuringExecution:
               nodeSelectorTerms:
               - matchExpressions:
                 - key: kubernetes.io/hostname
                   operator: In
                   values:
                     - cluster1-node01
         containers:
         - name: busybox
           image: busybox
           command:        # <- Any variation of sleep command should work.
           - bin/sh        # Needs to sleep long enough to get to end of test.
           - -c
           - sleep 10000
           volumeMounts:
           - mountPath: /usr/src
             name: python-data
             readOnly: true
         - name: python
           image: poroko/flask-demo-app
           ports:
           - containerPort: 5000
           volumeMounts:
           - name: python-data
             mountPath: /usr/share/
         volumes:
         - name: python-data
           persistentVolumeClaim:
             claimName: olive-pvc-cka10-str
     selector:
       matchLabels:
         app: olive-app-cka10-str
    
   ---
    
   apiVersion: v1
   kind: Service
   metadata:
     name: olive-svc-cka10-str
     namespace: default
   spec:
     ports:
     - nodePort: 32006
       port: 5000
       protocol: TCP
       targetPort: 5000
     selector:
       app: olive-app-cka10-str
     type: NodePort

4. Create the resources

   kubectl apply -f /root/olive-app-cka10-str