Question

Kubernetes roadmap - Will PVCs supporting ReadWriteMany be delivered in 2019

Posted April 28, 2019 1.3k views
DigitalOcean

Would a DigitalOcean blob post please be written detailing the Kubernetes roadmap for 2019/20, specifically the priority order in which DO plan to release features.

I my case: I need to know when/if Kubernetes PVC’s will soon (2019) support access modes ReadWriteMany and ReadOnlyMany as these two are rather critical to horizontal scaling without having to monkey around with NFS nodes.

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1 answer

Greetings!

Great question. At the moment we do not have any plans for a storage volume that could be mounted simultaneously to multiple droplets, which I believe is the underlying function behind your question. This is mostly about the limitations of a block device on a system and not specifically a product feature awaiting implementation. While I cannot say for sure that we will never release a type of managed storage that could serve that function, a direct block device (think of it like a USB drive) is unlikely to ever fit that need.

While you could use StatefulSets to create a scaled deployment where each replicate has it’s own PVC, the data replication would still be a separate issue to solve.

I highly recommend considering an alternate type storage for such a task. Something like object storage (Spaces) will be far better suited to having multiple systems read/write from/to it at the same time. Another team member suggested that this might be a helpful path, but we’ve neither success nor failure stories to share with it: https://github.com/gluster/gluster-kubernetes

Jarland

  • The lack of support for this NFS with StatefulSets prevents us (the customer) from using our own NFS server and ties us to using the hosting company “Volumes” feature at an additional cost!

    I always find this practice by Product Managers shady, this seems like it is designed to trick your customers into investing time into your platform and then introduce this new, additional cost, to get the client to pay more. This is a deal-breaker and you should let your customer know before investing time and money into your platform.

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