Kubernetes-Storage

:ID: 1369d5e6-2858-4fc5-b59c-942326890b40

Volume Types

emptyDir

Empty directory for storing data ephemeral data from the Pods

apiVersion: v1
kind: Pod
spec:
  volumes:
    - name: html
      emptyDir: {}
  containers:
    - name: nginx
      image: nginx:alpine
      volumeMounts:
	- name: html
	  mountPath: /usr/share/nginx/html
	  readOnly: false

    - name: html-example
      image: alpine:latest
      command: ["/bin/sh", "-c"]
      args:
	- while true; do date >> /html/index.html; sleep 10; done
      volumeMounts:
	- name: html
	  mountPath: /html
	  readOnly: false

hostPath

A volume that's mounted in the Node's filesystem and is shared with a Pod

nfs

A NFS share mounted into the Pod

configMap/secret

Provides access to resources

persistentVolumeClaim

A persistentVolume is a cluster-wide storage resource that relies on network-attached storage. It's abstracted and associated to a Pod via a PersistentVolumeClaim (PVC).

Definying a persistent volume

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-1
spec:
  capacity:
    storage: 20Gi
  accessModes:
    - ReadWriteOnce
    - ReadOnlyMany
  persistentVolumePolicy: Retain
  azureFile:
    secretName: <azure-secret>
    shareName: <azure-fileshare>
    readOnly: false

Setting up a volume claim

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pv-demo
  annotations:
    volume.beta.kubernetes.io/storage-class: accounthdd
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  storageClassName: cdk-cinder

Cloud

Cluster-wide storage, which varies depending on the cloud provider

AWS
- Elastic Block Store
Azure
- Azure Disk
- Azure File
GCP
- GCE Persistent Disk