Kubernetes EFS volumes mounted as RWO

Question

Hi,

For a deployment that I need to do on Kubernetes,  I have to define several different storage classes,  one with RWO disk devices, and other one with RWM.
As far as I am aware,   EBS volumes are RWO,  and EFS volumes are RWX,  so the easy solution is to define a storage class for EBS volumes, and other one called for RWX on each type of drive.     However, my concern is about EBS volumes.  As far as I am aware, an EBS volume is attached to a single node, so the pod should be "tied" always to that node.  If for whatever reason that node crash, the pod will not be able to arrange on a new node.

My question is:  In order to avoid that problem,  may I define a RWO volume also on EFS drivers (instead the default RWX type) ?

Answer

if I understand the question correctly, yes you can set the access type of an EFS volume to RWO. See about halfway down this blog https://aws.amazon.com/blogs/storage/persistent-storage-for-kubernetes/

```
spec:
  accessModes:
    - ReadWriteOnce
```

Kubernetes EFS volumes mounted as RWO

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