DevOps Classroom notes 20/Jan/2026

Storage in kubernetes

• Storage in k8s revolves around the following concepts
  • volume
  • persistent volume
  • persistent volume claim
  • storage drivers
  • CSI
  • ACCESS Modes
    • RWO
    • RMWO
    • RWM (shared disks)
• Refer Here for persistent volumes

• Prompt Give me the relation between pv, pvc, storage class and csi in a simple manner

Lets create a volume

• Refer Here
• Sample manifest for volume (emptyDir)

apiVersion: v1
kind: Pod
metadata:
  name: alpine-pod
  labels:
    app: alpine-demo
spec:
  containers:
    - name: alpine
      image: alpine:latest
      command: ["sh", "-c", "echo 'Hello from Alpine Pod'; sleep 3600"]
      volumeMounts:
        - name: sample-vol
          mountPath: /sample-directory
  volumes:
    - name: sample-vol
      emptyDir: {}

Lets create a Config Map as volume

• sample

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql-cm
data:
  MYSQL_ROOT_PASSWORD: admin123
  MYSQL_DATABASE: mydb
  MYSQL_USER: myuser
  MYSQL_PASSWORD: mypassword
---
apiVersion: v1
kind: Pod
metadata:
  name: cm-pod
  labels:
    app: alpine-demo
spec:
  containers:
    - name: alpine
      image: alpine:latest
      command: ["sh", "-c", "echo 'Hello from Alpine Pod'; sleep 3600"]
      volumeMounts:
        - name: cm-vol
          mountPath: /cm-demo
  volumes:
    - name: cm-vol
      configMap:
        name: mysql-cm