Hanzo S3

Hanzo S3 is S3-compatible distributed object storage: a master, volume servers, a filer and an S3 gateway, all in one Go binary called s3.

Install

Every release is an image, tagged v<X.Y.Z>:

docker pull ghcr.io/hanzoai/s3:v1.0.24

Or build the s3 binary from a clone:

git clone https://git.hanzo.ai/hanzoai/s3
cd s3 && go build -o s3 ./s3

go install github.com/hanzoai/s3/s3@latest will not work. This tree replaces github.com/tyler-smith/go-bip39, whose upstream repository was deleted, and Go refuses replace directives when installing at a version.

On macOS, if a downloaded binary is quarantined: xattr -d com.apple.quarantine ./s3.

First run

s3 mini brings up the whole stack — master, volume, filer, S3 gateway — with credentials and a bucket already created:

AWS_ACCESS_KEY_ID=admin \
AWS_SECRET_ACCESS_KEY=secret \
S3_BUCKET=my-bucket \
s3 mini -dir=/data

The same run in Docker:

docker run -p 8333:8333 \
  -e AWS_ACCESS_KEY_ID=admin \
  -e AWS_SECRET_ACCESS_KEY=secret \
  -e S3_BUCKET=my-bucket \
  ghcr.io/hanzoai/s3 mini -dir=/data

mini is what reads S3_BUCKET and what listens on 8333. The image's default command is server -s3 -s3.port=9000, which serves S3 on 9000 and creates no bucket — so name mini explicitly, or map 9000 and create the bucket yourself.

Point any S3 client at it:

import boto3

s3 = boto3.client(
    "s3", endpoint_url="http://localhost:8333",
    aws_access_key_id="admin", aws_secret_access_key="secret",
    region_name="us-east-1",
)
s3.put_object(Bucket="my-bucket", Key="hello.txt", Body=b"hi")
print(s3.get_object(Bucket="my-bucket", Key="hello.txt")["Body"].read())

What s3 mini starts:

S3_BUCKET takes a comma-separated list. S3_TABLE_BUCKET creates S3 Tables (Iceberg) buckets. Leave the AWS keys out and the S3 gateway runs unauthenticated, which is fine for local development and nothing else.

Running it for real

s3 mini is one process for convenience. In a cluster you run the components separately:

s3 master -mdir=/data/master
s3 volume -dir=/data/vol1 -master=<master_host>:9333 -port=8081
s3 filer  -master=<master_host>:9333
s3 s3     -filer=<filer_host>:8888 -port=8333

Add volume servers to add capacity — each one registers with the master and starts taking writes. s3 -h lists every command; s3 <command> -h lists its flags. s3 scaffold writes starter config files.

Console

s3 admin serves the web console on port 23646 — cluster topology, volume and collection management, a file browser, users, policies and service accounts, and scheduled maintenance:

s3 admin -master=<master_host>:9333 -adminPassword=<password> -dataDir=/var/lib/s3-admin

Leave -adminPassword unset and the console runs with no authentication, so set one anywhere it is reachable. -readOnlyUser/-readOnlyPassword add a view-only account. -dataDir persists console configuration and maintenance state across restarts.

For administration from a terminal, s3 shell is an interactive shell over the same cluster: buckets and their lifecycle, quota, versioning and object lock; IAM users, groups, policies, access keys and service accounts; volumes, erasure coding, the filer tree and remote tiering. help lists them all.

Beyond the S3 API, the filer gives you POSIX-shaped directories over HTTP, FUSE mounting (s3 mount), WebDAV, cross-cluster replication (s3 filer.sync), tiering to remote object stores, erasure coding for warm data, and a built-in Iceberg REST catalog so Spark, Trino, DuckDB and friends can read tables without a separate metastore. Kubernetes manifests are in k8s/, Docker Compose files in docker/.

Clients

Any S3 client works. Ours for Go is hanzos3/go, module github.com/hanzos3/go. This repository is the server.

One name

The product is Hanzo S3. The source repo hanzoai/storage redirects here — a rename, not a separate product. "Hanzo Storage" in our copy is stale wording, not a second server.

The image ghcr.io/hanzoai/storage is a different matter, and the repo rename does not carry over to it: live compose files still pull it and start it with minio server, so it is not this server. Read a hanzoai/storage image reference as MinIO until it is retired.

hanzoai/storage-go and hanzoai/s3-go were earlier names for the Go client and are deleted, not redirected — a Go module path cannot redirect, so anything still pinning them fails to resolve. github.com/hanzos3/go is the one that exists.

Docs

LLM.md in this repository is the deep reference: architecture, the filer metadata store, the ZAP transport, and how S3 fits the rest of the platform. docs.hanzo.ai covers the platform around it.

Lineage

Hanzo S3 is a fork of SeaweedFS at its 4.34 release series, Apache-2.0, copyright Chris Lu — see NOTICE. The upstream binary is weed; ours is s3, and every import path is github.com/hanzoai/s3. The storage design it inherits comes from Facebook's Haystack paper, with erasure coding after f4. Two support libraries are forked alongside it, each keeping its own upstream licence: hanzoai/goexif (BSD-2-Clause) and hanzoai/go-fuse (BSD-3-Clause).

License

Apache-2.0 — see LICENSE.

Links

• Source
• Project site