🚪 Access multiple storage backends via the S3 API
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S3Proxy allows applications using the S3 API to access other storage backends, e.g., local file system, Google Cloud Storage, Microsoft Azure, OpenStack Swift.


Users can download releases from GitHub. Developers can build the project by running mvn package which produces a binary at target/s3proxy. S3Proxy requires Java 7 to run.


Configure S3Proxy via a properties file. An example using the local file system as the storage backend with anonymous access:


First create the filesystem basedir:

mkdir /tmp/s3proxy

Next run S3Proxy. Linux and Mac OS X users can run the executable jar:

chmod +x s3proxy
s3proxy --properties s3proxy.conf

Windows users must explicitly invoke java:

java -jar s3proxy --properties s3proxy.conf

Finally test by creating a bucket then listing all the buckets:

$ curl --request PUT http://localhost:8080/testbucket

$ curl http://localhost:8080/
<?xml version="1.0" ?><ListAllMyBucketsResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Owner><ID>75aa57f09aa0c8caeab4f8c24e99d10f8e7faeebf76c078efc7c6caea54ba06a</ID><DisplayName>CustomersName@amazon.com</DisplayName></Owner><Buckets><Bucket><Name>testbucket</Name><CreationDate>2015-08-05T22:16:24.000Z</CreationDate></Bucket></Buckets></ListAllMyBucketsResult>

See the wiki for examples of other storage backends.

Supported storage backends

  • atmos
  • aws-s3
  • azureblob
  • filesystem (on-disk storage)
  • google-cloud-storage
  • hpcloud-objectstorage
  • openstack-swift
  • rackspace-cloudfiles-uk and rackspace-cloudfiles-us
  • s3
  • swift and swift-keystone (legacy)
  • transient (in-memory storage)


S3Proxy has broad compatibility with the S3 API, however, it does not support:

  • ACLs other than private and public-read
  • AWS signature V4, see #24
  • BitTorrent hosting
  • bucket logging
  • Cache-Control header, see #115
  • conditional copy object, see #113
  • listing multipart uploads, see #118
  • POST uploads, see #73
  • object server-side encryption
  • object versioning, see #74
  • requester pays buckets
  • XML ACLs, see #116

S3Proxy emulates the following operations:

  • multi-part uploads, see #2
  • copy objects, see #46

The wiki collects compatability notes for specific storage backends.


  • Apache jclouds provides storage backend support for S3Proxy
  • Ceph s3-tests help maintain and improve compatibility with the S3 API
  • fake-s3, gofakes3, S3 ninja, and s3rver provide functionality similar to S3Proxy when using the filesystem backend
  • GlacierProxy and SwiftProxy provide similar functionality for the Amazon Glacier and OpenStack Swift APIs
  • s3proxydocker packages S3Proxy as a Docker container
  • sbt-s3 run S3Proxy via the Scala Build Tool
  • swift3 provides an S3 middleware for OpenStack Swift


Copyright (C) 2014-2016 Andrew Gaul

Licensed under the Apache License, Version 2.0