Kubernetes Certification Practice Test (Storage Volumes)

Kubernetes storage volumes is a very important concept in relation to how data is managed within a Pod (consisting of one or more containers) and also the data lifecycle.

In this post, you will learn about some of the following in relation to Kubernetes storage volumes. There is a practice test which will help you test your knowledge in relation to the storage volumes concept in Kubernetes. This test could prove to be useful and helpful for Kubernetes certification examination for Certified Kubernetes Administration (CKA). It may also prove to be useful for interviews.

• Revision notes on Kubernetes storage volumes
• Practice test

Revision Notes

• Kubernetes different volume types such as some of the following to mount volume into the pod:
  • emptyDir
  • hostPath
  • File systems
    • cephfs
    • glusterfs
  • Cloud platforms
    • awsElasticBlockStore
    • azureDisk
    • azureFile
    • gcePersistentDisk
  • nfs (network file system)
  • Vendor specific volume types
    • ScaleIO
    • Quobyte
    • Flocker
    • StorageOS
    • vsphereVolume
    • rbd (RADOS block device)
    • Cinder (Openstack block storage)
    • portworxVolume
• The following represents a template Pod specification file representing details on how volumes can be defined at Pod and containers level.
  • At Pod level, the volume information is defined using following template. Pay attention to the field spec.volumes.

    spec:
      containers:
        - name: someContainerName
    	  ...	
      volumes:
        - name: someVolumeName
    	  <volumeType>:
    

    </li>
    <li>At container level, the volume specification is defined using following template. Pay attention to the field <strong>spec.containers.volumeMounts</strong>.

    spec:
      containers:
        - name: someContainerName
    	  ...
    	  volumeMounts:
    	  - mountPath: somePath
    	    name: someVolumeName
      volumes:
        - name: someVolumeName
    	  <volumeType>:
    

• Based on the above, the following represents a sample Pod specification file demonstrating the volumes (volume of type hostPath) defined at Pod and containers level. Pay attention to the fields such as spec.containers.volumeMounts and spec.volumes.

  apiVersion: v1
  kind: Pod
  metadata:
    name: test-pod
  spec:
    containers:
    - image: k8s.gcr.io/test-webserver
      name: test-container
      volumeMounts:
      - mountPath: /test-pod
        name: test-volume
    volumes:
    - name: test-volume
      hostPath:
        path: /data
  

• Kubernetes support different types of volumes to be mounted, from different cloud platform storage system, into the pod. The following represents volume types for AWS, Azure and Google cloud:
  • awsElasticBlockStore (AWS)
  • azureDisk (Azure)
  • azureFile (Azure)
  • gcePersistentDisk (Google Cloud)
• Kubernetes support different types of volumes to be mounted, from different types of file systems, into the pod.
  • cephfs (Ceph File system)
  • glusterfs (Gluster File system)

Practice Tests – Kubernetes Storage Volumes

The following represents questions and answers which can help you to test your knowledge in relation to Kubernetes storage volumes.

Additional Practice Tests

These are additional practice tests which relates to core concepts part of CKA certification test. Note that as per syllabus, core concepts will cover 19% questions in CKA certification test.

• Practice Test on introduction to Kubernetes
• Practice Test on Pods, Taints and Tolerations
• Practice Test on Container hooks / Pods
• Practice Test on Pod Lifecycle
• Practice Test on Services
• Practice test on service discovery

Further Reading / References

• Kubernetes Storage Volumes

Summary

In this post, you briefly learned about details related to Kubernetes storage volumes. You were also provided with a set of questions and answers in form of practice test to check your knowledge in relation to Kubernetes storage volumes.

Did you find this post useful? Do you have any questions or suggestions about this article in relation to practice tests and revision notes in relation to Kubernetes storage volumes? Leave a comment and ask your questions and I shall do my best to address your queries.