What Can Replace MinIO? A Deep Dive into Ceph, SeaweedFS, Garage, and RustFS

Background

MinIO announced it is moving into maintenance mode, raising questions about a replacement for this popular open‑source S3‑compatible object storage system.

Tested Alternatives

The author evaluated four open‑source projects that provide S3‑compatible APIs—Ceph, SeaweedFS, Garage, and RustFS. All were packaged as Linux RPM/DEB files and are available at https://pgext.cloud.

Overall Verdict

No perfect replacement exists. Each project has trade‑offs that prevent it from being a drop‑in substitute for MinIO.

Individual Comparisons

Ceph : Feature‑rich and suitable for enterprise use, but requires a steep learning curve, dedicated operations staff, and additional components (e.g., monitors, OSDs). It is more complex than MinIO’s single‑binary deployment.

SeaweedFS : Optimized for massive small‑file workloads with O(1) disk addressing and excellent performance in that scenario. It depends on an external metadata database, adding operational complexity.

Garage : Lightweight (~10 MB) project from the European Deuxfleurs team, funded by the EU NGI program. S3 compatibility is limited—no versioning, cross‑region replication, or IAM support—making it unsuitable for many enterprise use cases.

RustFS : The only project explicitly targeting the “MinIO replacement” niche. It is still in Alpha, requires special certificate‑name handling, uses a different health‑check API, and lacks the mc admin command for detailed IAM policy configuration.

RustFS Specific Differences

Requires certificates with a specific Common Name format.

Health‑check endpoint differs from MinIO’s ( /minio/health/ready vs. RustFS’s custom endpoint).

Does not support mc admin commands, limiting IAM policy management.

Risk Assessment of RustFS

AI analysis (GPT‑5‑pro, Claude‑4‑Opus, Gemini‑3‑pro) identified risk signals identical to those that later affected MinIO: Apache‑2.0 license with a contributor licence agreement that transfers copyright, and control by a single commercial entity. Consequently, the rating was downgraded from “optimistic” to “cautiously watchful”.

Recommendation: Continue Using MinIO

For the short term, the most reliable approach is to keep using MinIO:

Deploy the latest release rather than the last fully‑featured version (20250422). A critical CVE (CVE‑2025‑62506, privilege‑escalation via session‑policy bypass, HIGH) was fixed in version 20251015.

Apply network isolation (e.g., firewalls, VPC segmentation) to limit exposure of any remaining vulnerabilities.

Compilation is straightforward: MinIO is a Go project and can be built with a single go build command or via goreleaser for cross‑platform binaries.

Community Maintenance Opportunity

Given MinIO’s maturity, a community‑driven LTS fork could be created by cherry‑picking important bug fixes and security patches from the 20250422 baseline. This would provide a sustainable, self‑maintained version for organizations that rely on MinIO.

Conclusion

While several open‑source object‑storage projects exist, none currently matches MinIO’s blend of simplicity, performance, and ecosystem maturity. The prudent short‑term strategy is to lock the latest MinIO version, enforce network isolation, and monitor the community for a viable successor or a stable RustFS GA release.