Volumes

As pods are transient, volumes allow persistent storage in the cluster. A simple volume can be created and mounted in a pod, specifying the path in the host, from a config map or a Secret.

spec:
  containers:
    - volumeMounts:
        - mountPath: /opt
          name: data-volume
  volumes:
  # volume from a dir in the node
  - name: data-volume
    hostPath:
      path: /data
      type: Directory
  # volume from config map
  - name: configmap-volume
    configMap:
      name: app-config
  # volume from a secret
  - name: secret-volume
    secret:
      secretName: app-secret

But things get complicated when the cluster is composed with more than one node as nodes don’t share the same storage. For this case, let the cluster administrator set up a storage solution and use Persistent volumes with Persistent volume claim.