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Kubernetes EFS volumes mounted as RWO

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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) ?

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StockageCalculConteneurs
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Système de fichiers élastique AmazonStockageKubernetes
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English
Andres
demandé il y a 8 mois506 vues
1 réponse
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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
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EXPERT
Steve_M
répondu il y a 8 mois
  • Andres
    il y a 8 mois

    The problem is that access type is defined on the PVC, and not on the class.. And since this is a helm deployment, I can not change the access type used on the PVC. The helm install requires me to define a StorageClass in advance, and the PVC would use that StorageClass, but I can not change the spec of the PVC, is hard-coded on the helm. So, going in further details: It is possible to define the accessMode in the storageclass or I am forces to do it on the PVC ?

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