CKA Prep Series part 1: Creating StorageClasses

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Part 1: StorageClasses

This is my first blog post about containerization and orchestration. The goal is to learn and pass the CKA (Certified Kubernetes Administrator) exam. While preparing for my exam, I’ll create this series, hopefully to help others as well.
In each post, I will:

  • Share what I learn so others can follow the same path and improve their understanding
  • Review exam-style simulation questions (similar to what you see in the CKA exam)
  • Try to solve them myself, step by step
  • Explain the commands and concepts involved

    So let’s get started and jump right in with the first question.
Q1. Create StorageClasses

There is an existing default StorageClass using the rancher.io/local-path provisioner.

Task:
Create a new StorageClass named retain-storage using the same provisioner, but with:

volumeBindingMode: WaitForFirstConsumer

reclaimPolicy: Retain

Step 1: Check the existing StorageClass

To see the existing StorageClasses, run:

kubectl get sc

or the shorter version:

k get sc

You’ll see the default StorageClass that uses rancher.io/local-path.

Step 2: Create the new retain-storage StorageClass

Create a YAML file (e.g. sc.yaml):
II like to use the command:

vi sc.yaml

and jump right inside the file, editing it with insert from the keyboard.
(You can use a default template from the Kubernetes documentation: Kubernetes Documentation | Kubernetes)

The template should look like this (notice the values from the task):

Once you’ve created the file, apply it:

kubectl apply -f sc.yaml

or

k -f sc.yaml apply

At the end you can see that retain-storage was created by checking the StorageClass with command “k get sc”

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