JuiceFS

Judgement

What it is

Building block

What it does

A POSIX filesystem that stores file data in object storage such as S3 and metadata in Redis, PostgreSQL, TiKV or similar, mountable on many machines at once.

Adopt it when

You need a shared filesystem across servers or Kubernetes pods backed by cheap object storage, for example for AI training data.

Watch out

Performance and safety depend on the metadata engine you choose and run, and some features are in the paid Enterprise edition.

Ready for

Production-ready

Runs as

Command line and self-hosted server

Built with

Go, Redis and S3

How established

Established: started 5 years ago, latest release v1.4.2.

What the license allows

You can build it into a product you sell, as long as you keep its copyright notice.

Judged on 2026-11-06 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: JuiceFS → Go → runs on a microchip

How compilers were built, back to punched paper tape

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