Volumes

Type of Volumes

• awsElasticBlockStore
• azureDisk
• cephhfs
• cinder
• fc (fibre chanel)
• flocker (depricated)
• gcePersistentDisk (for Google Cloud)
• glusterfs (RedHat)
• iscsi
• local
• NFS
• portworxVolume
• vSphere VMDK
• hostPath (not recomended for production)

hostPath configuration example

---
# This manifest mounts /data/foo on the host as /foo inside the
# single container that runs within the hostpath-example-linux Pod.
#
# The mount into the container is read-only.
apiVersion: v1
kind: Pod
metadata:
  name: hostpath-example-linux
spec:
  os: { name: linux }
  nodeSelector:
    kubernetes.io/os: linux
  containers:
  - name: example-container
    image: registry.k8s.io/test-webserver
    volumeMounts:
    - mountPath: /foo # <-- container volume
      name: example-volume 
      readOnly: true
  volumes:
  - name: example-volume
    # mount /data/foo, but only if that directory already exists
    hostPath:
      path: /data/foo # directory location on host
      type: Directory # this field is optional

Hands on

vim mysqlpod.yaml

apiVersion: v1
kind: Pod
metadata:
  name: dbpod
spec:
  os: { name: linux }
  nodeSelector:
    kubernetes.io/os: linux
  containers:
  - name: mysql
    image: mysql:5.7
    volumeMounts:
    - mountPath: /var/lib/mysql # <-- container volume
      name: dbvol
      readOnly: true
  volumes:
  - name: dbvol
    hostPath:
      path: /data
      type: DirectoryOrCreate

kubectl apply -f mysqlpod.yaml

kubectl get pods

kubectl describe dbpod

kubectl delete pod dbpod

validate that volume host path is /data

validate that mount volume is /var/lib/mysql