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EFS Access Points

Like volume path mounts, mounting EFS access points allows you to expose separate data stores with independent ownership and permissions from a single EFS volume. In this case, the separation is managed on the EFS side rather than the kubernetes side.

Note: Because access point mounts require TLS, this is not supported in driver versions at or before 0.3.

Create Access Points (in EFS)

Following this doc, create a separate access point for each independent data store you wish to expose in your cluster, tailoring the ownership and permissions as desired. There is no need to use different EFS volumes.

Note: Although it is possible to configure IAM policies for access points, by default no additional IAM permissions are necessary.

This example assumes you are using two access points.

Edit Persistent Volume Spec

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: efs-pv1
spec:
  capacity:
    storage: 5Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  storageClassName: efs-sc
  csi:
    driver: efs.csi.aws.com
    volumeHandle: [FileSystemId]::[AccessPointId]
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: efs-pv2
spec:
  capacity:
    storage: 5Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  storageClassName: efs-sc
  csi:
    driver: efs.csi.aws.com
    volumeHandle: [FileSystemId]::[AccessPointId]

In each PersistentVolume, replace both the [FileSystemId] in spec.csi.volumeHandle and the [AccessPointId] value of the accesspoint option in spec.mountOptions. You can find these values using the AWS CLI:

>> aws efs describe-access-points --query 'AccessPoints[*].{"FileSystemId": FileSystemId, "AccessPointId": AccessPointId}'

If you are using the same underlying EFS volume, the FileSystemId will be the same in both PersistentVolume specs, but the AccessPointId will differ.

Note: The double colon in the volumeHandle is intentional. The middle field indicates the subpath; if omitted, no subpath is used. See below for more information.

Deploy the Example Application

Create PVs, persistent volume claims (PVCs), and storage class:

>> kubectl apply -f examples/kubernetes/volume_path/specs/example.yaml

Check EFS filesystem is used

After the objects are created, verify the pod is running:

>> kubectl get pods

Also you can verify that data is written into the EFS filesystems:

>> kubectl exec -ti efs-app -- tail -f /data-dir1/out.txt
>> kubectl exec -ti efs-app -- ls /data-dir2

Other Details

  • Using access points via volumeHandle automatically adds the tls mount option.
  • It is deprecated to specify access points via mountOptions, e.g.
spec:
  mountOptions:
    - tls
    - accesspoint=fsap-068c22f0246419f75

as this could subject you to issue #167.

  • It is possible to use a combination of volume path and access points with a volumeHandle of the form [FileSystemId]:[Subpath]:[AccessPointId], e.g. volumeHandle: fs-e8a95a42:/my/subpath:fsap-19f752f0068c22464. In this case:
    • The [Subpath] will be under the configured access point directory. For example, if you configured your access point with /ap1, the above would mount to /ap1/my/subpath.
    • As with normal volume path, the [Subpath] must already exist prior to consuming the volume from a pod.