Re: [MirageOS-devel] Current persistent storage situation

[Gabriel de Perthuis <g2p.code@xxxxxxxxx>]

Hello,

I'm the developer of Wodan.  Wodan itself is restricted to fixed-sized
keys and bounded-size values which might be too constraining for you.  I
am currently working on an Irmin layer on top of it.  It's currently in
a private branch until all tests pass; the chunking approach seems to
break the existing tests.

Le 14/11/2017 à 15:39, Sven Anderson a écrit :
> Hi,
> 
> TL;DR: what current persistent storage options are out there _now_?
> 
> for our project (secure private key storage,
> https://github.com/keyfender) we need a persistent storage for our
> unikernel application, persistent in the meaning of surviving reboots of
> the unikernel. It doesn't have to be necessarily "local" in a sense of
> writing it to a storage device that the mirage unikernel has direct
> access to, it could also be another VM, that runs a network daemon that
> the unikernel is connecting to. The latter would have the advantage of
> giving us concurrency for multi-core or multi-node for free which we
> plan to support anyway.
> 
> The data we need to store has a simple KV structure, for configuration
> and payload data, the keys are strings, the values are arbitrary ocaml
> objects, they could be serialized into json though, if necessary. The
> data amount is rather small, write rarely, read often (but should be
> cached locally, because of the pretty constant nature of the data).
> Consistency between different threads/nodes would be more important than
> IO performance.
> 
> Now the question is: what options do we have, if any?
> 
> Irmin seems to be a pretty good fit, giving us a distributed storage
> structure, and IIUC Irmin within MirageOS doesn't store locally but
> could use a Git server or Non-Mirage-Irmin-Server on another node as
> persistent storage, is this correct?
> 
> What other options are out there? the Wodan project
> (https://github.com/g2p/wodan) is ready for "production"?
> 
> Are there backends for standard SQL databases, like MariaDB/PostgreSQL?
> 
> Thanks in advance for any pointers and hints!
> 
> 
> Cheers
> 
> Sven
> 
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