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Shared storage between virtual instances (feddit.nl)

submitted 1 year ago* (last edited 1 year ago) by hsdkfr734r@feddit.nl to c/selfhosted@lemmy.world

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Hi, right now I'm in the planning process for a self hosted virtualization and containerization environment on one or more Linux hosts. Incus looks promising. And there will be mainly Linux instances. I'm not sure how to solve the shared storage issue - since it is a bad idea to mount a fs more than once. Maybe you have some hints? I'd appreciate that. :)

The OS of an instance can sit on an exclusively used volume, that is solved for me (store it in a local storage pool).

But how should I organize shared read/write storage? It should be accessed by multiple instances at the same time. It should be easily usable as a mount point. Storage replication among multiple hosts is optional - there is rsync. Is NFS still the way to go or are there nicer options? Is there an overlayfs which could resolve concurrent writes?

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[–] jabjoe@feddit.uk 4 points 1 year ago (1 children)

VirtioFS. You can share from the host to any number of VMs with that. LibVirtd is good. Even has a nice GUI in virt-manager.

[–] hsdkfr734r@feddit.nl 2 points 1 year ago (1 children)

Since virtiofs has been developed for this scenario, it would be sane to use it for VMs. Thanks for the hint.

I will look into it. Some users had issues to get it running with incus - older unsupported libvirtd versions in the distri. Also dxa isn't supported, yet. But maybe it is still better than NFS performance wise.

[–] jabjoe@feddit.uk 3 points 1 year ago

It will be faster. It's also cooler because of the Plan9 history. 😀