S3

Reposilite supports S3-compatible storages as a backend for Maven repository.

Known S3-compatible storages used by our community:

Name	Description	Compatibility
AWS S3	Amazon Simple Storage Service	✔️
Cloudflare R2	Managed object storage without egress fees	✔️
MinIO	Self-hosted object storage	✔️
Ceph	Used by cloud providers like Contabo	✔️*

* - There were some issues with Ceph in the past, but it looks good enough lately

Each repository has individual storage provider configuration, so some of them can use object storage and others can use local filesystem.

By default, each S3 repository uses its own dedicated bucket and stores objects at the bucket root. You can also share a single bucket across multiple repositories (or with other services) — see

Sharing one bucket between repositories

S3 configuration can be defined in the Dashboard -> Settings -> Maven -> <Repository> section:

These values depend on your S3 provider & its configuration, so you have to check their documentation to find out how to configure them.

By default, Reposilite writes objects to the root of the bucket, which is why each S3 repository needs its own dedicated bucket. Two optional settings let multiple repositories — or other services — share a single bucket:

Key Prefix (prefix) — an optional prefix prepended to every object key. Use it to scope Reposilite's data within a bucket shared with other tools, e.g. set it to reposilite so all objects live under reposilite/… next to another service's registry/….
Shared Bucket (sharedBucket) — enable when several Reposilite repositories share one bucket. Object keys are then namespaced under the repository name, so repositories never collide with or see each other's files.

The resulting object key for an artifact com/example/lib.jar is:

Key Prefix	Shared Bucket	Object key
(empty)	off	`com/example/lib.jar` (default)
`reposilite`	off	`reposilite/com/example/lib.jar`
(empty)	on	`<repository>/com/example/lib.jar`
`reposilite`	on	`reposilite/<repository>/com/example/lib.jar`

For example, two repositories sharing one bucket with prefix: reposilite and sharedBucket: true:

s3://my-bucket/
└── reposilite/
    ├── releases/
    │   └── com/example/lib.jar
    └── snapshots/
        └── com/example/lib-1.0.0-SNAPSHOT.jar

Note - repositories sharing a bucket must not overlap. Either enable Shared Bucket on all of them (keys are namespaced per repository), or give each a distinct prefix. If two repositories would write to the same — or a nested — key namespace, Reposilite refuses to load the colliding ones and logs an error on startup.

Note - this check matches repositories by their configured endpoint and bucket name. If the same bucket is reached through different endpoint spellings (for example an empty endpoint that resolves to AWS versus an explicit AWS URL), Reposilite cannot tell they are the same bucket — keep the endpoint consistent across repositories that share one.

The default (empty prefix, Shared Bucket off) is unchanged, so existing single-bucket-per-repository setups keep working without any migration.

§ Cloudflare R2

Cloudflare R2

provides a managed, strongly consistent object store, an included free tier, and

does not charge for Internet egress

Create a bucket and an API token in Cloudflare, then configure the repository with the S3 endpoint shown in the R2 dashboard (https://<ACCOUNT_ID>.r2.cloudflarestorage.com), the generated access key and secret, and region auto.

Set Signer to LEGACY_V4 in the repository's S3 storage settings. The existing JVM flag (JAVA_OPTS environment variable for Docker users) remains available as a global override for all S3 repositories:

-Dreposilite.s3.use-s3-v4-signer=true

R2 credentials can be restricted to an existing bucket. If the token cannot create buckets, disable Reposilite's automatic bucket creation globally:

-Dreposilite.s3.skip-bucket-creation=true

§ MinIO

MinIO supports path-style access by default. Virtual-hosted access requires MINIO_DOMAIN and matching wildcard DNS; for a typical MinIO endpoint, enable path-style access with this global JVM flag (JAVA_OPTS environment variable for Docker users):

-Dreposilite.s3.pathStyleAccessEnabled=true

Example properties:

bucket: your-bucket
endpoint: http://minio:9000 # your minio endpoint
access-key: your-access-key
secret-key: your-secret-key
region: doesn't matter, e.g. us-east-1